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Diagnostic Aids

WARNING: This page is about a different variant/trim than selected.

Perform this test when instructed during QUICK TEST  or if directed by other test procedures. This test is used to diagnose the following:

Fig 1: AIR Test Circuit & Connector Terminals
G95B12600
  1. 1) DTC P0412: Check BATT+ At SSR  This DTC indicates EAIR primary circuit failure. Possible causes are as follows:
    • EAIR circuit open or short to power.
    • AIR by-pass solenoid failure.
    • Faulty PCM.

    Turn ignition off. Disconnect SSR. Turn ignition on. Measure voltage between SSR connector BATT+ terminal and negative battery terminal. If voltage is 10.5 volts or more, go to next step. If voltage is less than 10.5 volts, go to step 7).

  2. 2) Check EAIR Circuit Continuity  Turn ignition off. Leave SSR disconnected. Disconnect AIR by-pass solenoid. Temporarily remove secondary air dedicated fuse. Disconnect PCM 104-pin connector. Inspect for damaged pins and repair if necessary. Connect EEC-V Breakout Box (014-000950), leaving PCM disconnected. Measure resistance between test pin No. 70 (EAIR) at breakout box and EAIR terminal at SSR connector. If resistance is 5 ohms or more, repair open circuit and repeat QUICK TEST . If resistance is less than 5 ohms, go to next step.
  3. 3) Check EAIR Circuit Short To Power  Leave ignition off. Measure resistance between test pin No. 70 and test pins No. 71, 90 and 97 at breakout box. If resistance is more than 10,000 ohms, go to next step. If resistance is 10,000 ohms or less, repair short circuit and repeat QUICK TEST .
  4. 4)  Leave ignition off. Reconnect AIR by-pass solenoid. Measure resistance between test pin No. 70 and test pins No. 71, 90 and 97 at breakout box. If resistance is more than 10,000 ohms, go to next step. If resistance is 10,000 ohms or less, replace AIR by-pass solenoid and repeat QUICK TEST .
  5. 5)  Leave ignition off. Reconnect SSR. Measure resistance between test pin No. 70 and test pins No. 71, 90 and 97 at breakout box. If resistance is more than 10,000 ohms, replace PCM and repeat QUICK TEST . If resistance is 10,000 ohms or less, replace AIR by-pass solenoid and repeat QUICK TEST.
  6. 6) Check BATT+ Circuit Continuity  Leave ignition off. Disconnect SSR. Measure resistance between SSR connector terminal "A" and AIR system dedicated fuse. See Fig 1. If resistance is less than 5 ohms, replace dedicated fuse and repeat QUICK TEST . If resistance is 5 ohms or more, repair open in BATT+ circuit and repeat QUICK TEST.
  7. 7) DTC P0411  Check secondary air hoses for damage, wear or poor connections. Repair or replace as necessary. If all hoses are okay, go to next step.
  8. 8) Check EAIR MONITOR Circuit For Short To Power  Leave ignition off and SSR disconnected. Disconnect PCM 104-pin connector. Inspect for damaged pins and repair if necessary. Connect EEC-V Breakout Box (014-000950), leaving PCM disconnected. Turn ignition on. Measure voltage between test pin No. 5 at breakout box and chassis ground. If voltage is 10.5 volts or less, go to next step. If voltage is more than 10.5 volts, repair EAIR MONITOR circuit short to power and repeat QUICK TEST .
  9. 9) Check EAIR MONITOR Circuit For Short To Power  Turn ignition off. Reconnect SSR connector. Turn ignition on. Measure voltage between test pin No. 5 at breakout box and chassis ground. If voltage is 10.5 volts or more, go to next step. If voltage is less than 10.5 volts, replace PCM and repeat QUICK TEST .
  10. 10)  Leave ignition on. Measure voltage between test pin No. 5 at breakout box and chassis ground. Measure voltage between test pin No. 70 at breakout box and chassis ground. If either voltage measurements is 10.5 volts or less, go to next step. If both voltage measurements more than 10.5 volts, replace SSR and repeat QUICK TEST .
  11. 11) Check Air Pump Hoses  Turn ignition off. Inspect hoses between air pump and air control valves. If hoses are damaged or restricted, repair or replace as necessary and repeat QUICK TEST . If hoses are okay, go to next step.
  12. 12) Check Air Pump Operation  Leave ignition off. Disconnect air hose from air control valve. Start engine and allow to idle. After a 5 second delay, airflow should be present for 30-90 seconds. If airflow is as specified, go to next step. If airflow is not as specified, go to step 17).
  13. 13) Check For Vacuum At Air Control Valve  Leave ignition off. Disconnect vacuum hose from air control valve. Start engine and allow to idle. After about 5 seconds, vacuum should be present for 30-90 seconds. If vacuum is as specified, go to next step. If vacuum is not as specified go to step, 30).
  14. 14) Check Air Control Valve  Leave ignition off. Disconnect and plug air tube at air control valve outlet side. Inspect air tubes for damage and repair as necessary. Start engine and allow to idle. After about 5 seconds, airflow should be present at air control valve for 30-90 seconds. If airflow is as specified, go to next step. If airflow is not as specified, replace air control valve and repeat QUICK TEST .
    NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 14) to step 17). No test procedures have been omitted.
  15. 17) Check Air Pump Operation  Leave ignition off. Disconnect air pump wiring harness connector. Start engine and allow to idle. Measure voltage between connector EAIR MONITOR terminal and ground. See Fig 1. After about 5 seconds, voltage should be 10.5 volts or more for 20-30 seconds. If airflow is as specified, go to next step. If airflow is not as specified, go to step 21).
  16. 18) Check Ground Circuit  Leave ignition off and air pump disconnected. Measure resistance between air pump connector ground terminal and chassis ground. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in ground circuit and repeat QUICK TEST .
  17. 19) Check Air Pump Hoses  Turn ignition off. Inspect air inlet hose. If hose is damaged or restricted, repair or replace as necessary and repeat QUICK TEST . If hose is okay, go to next step.
  18. 20) DTC 1413: Check For Voltage At SSR  Leave ignition off. Disconnect SSR. Turn ignition on. Measure voltage between SSR connector BATT+ terminal and chassis ground. If voltage is less than 10.5 volts, go to step 25). If voltage is 10.5 volts or more, go to next step.
  19. 21) Check EAIR MONITOR Circuit Voltage  Leave ignition off. Reconnect SSR. Disconnect air pump wiring harness connector. Start engine and allow to idle. Measure voltage between connector EAIR MONITOR terminal and chassis ground. If voltage is more than 10.5 volts and DTC P0411 is present, replace air pump. If voltage is more than 10.5 volts and DTC P0411 is not present, go to step 24). If voltage is 10.5 volts or less, go to next step.
  20. 22) Check EAIR MONITOR Circuit Continuity  Turn ignition off. Disconnect SSR. Disconnect PCM 104-pin connector. Inspect for damaged pins and repair if necessary. Connect EEC-V Breakout Box (014-000950), leaving PCM disconnected. Measure resistance between test pin No. 5 at breakout box and EAIR MONITOR terminal at SSR connector. Measure resistance between EAIR MONITOR terminal at SSR connector and EAIR MONITOR terminal at air pump connector. If both resistance measurements are 5 ohms or more, repair open in EAIR MONITOR circuit and repeat QUICK TEST . If resistance is less than 5 ohms, go to next step.
  21. 23) Check EAIR MONITOR Circuit For Short To Ground  Turn ignition off. Leave SSR and air pump disconnected. Measure resistance between test pin No. 5 and test pins No. 51, 76 and 91 at breakout box. If each resistance measurement is more than 10,000 ohms, replace SSR and repeat QUICK TEST . If any resistance measurement is 10,000 ohms or less, repair EAIR MONITOR circuit short to ground and repeat QUICK TEST.
  22. 24) Check EAIR MONITOR Circuit Voltage  Leave ignition off. Reconnect air pump. Disconnect PCM 104-pin connector. Inspect for damaged pins and repair if necessary. Connect EEC-V Breakout Box (014-000950), leaving PCM disconnected. Start engine and allow to idle. Measure voltage between test pin No. 5 and chassis ground. After about 5 seconds, voltage should be 10.5 volts or more. If voltage is as specified, replace PCM and repeat QUICK TEST . If voltage is not as specified, repair open in EAIR MONITOR circuit and repeat QUICK TEST.
  23. 25) Check BATT+ Circuit Continuity  Leave ignition off and SSR disconnected. Measure resistance between SSR connector terminal "A" and AIR system dedicated fuse. See Fig 1. If resistance is less than 5 ohms, replace dedicated fuse and repeat QUICK TEST . If resistance is 5 ohms or more, repair open in BATT+ circuit and repeat QUICK TEST.
  24. 26) DTC P1414: Check EAIR MONITOR Circuit Continuity  Turn ignition off. Disconnect air pump and SSR wiring harness connectors. Disconnect PCM 104-pin connector. Inspect for damaged pins and repair if necessary. Connect EEC-V Breakout Box (014-000950), leaving PCM disconnected. Measure resistance between test pin No. 5 at breakout box and EAIR MONITOR terminal at air pump connector. If resistance is 5 ohms or more, repair open in EAIR MONITOR circuit and repeat QUICK TEST . If resistance is less than 5 ohms, go to next step.
  25. 27)  Leave ignition off and air pump disconnected. Measure resistance between air pump terminals. If resistance is 0.5-5.0 ohms, go to next step. If resistance is not 0.5-5.0 ohms, replace air pump and repeat QUICK TEST .
  26. 28) Check EAIR Circuit For Short To Ground  Turn ignition off. Leave SSR disconnected. Disconnect air injection by-pass solenoid. Measure resistance between test pin No. 70 and test pins No. 51, 76 and 91 at breakout box. If each resistance measurement is 10,000 ohms or more, go to next step. If any resistance measurement is less than 10,000 ohms, repair EAIR circuit short to ground and repeat QUICK TEST .
  27. 29) Check EAIR Monitor Circuit For Short To Power  Leave ignition off and SSR disconnected. Reconnect air pump. Turn ignition on. Measure voltage between test pin No. 5 at breakout box and chassis ground. If voltage is 5 volts or more, repair EAIR MONITOR circuit short to power and repeat QUICK TEST . If voltage is less than 5 volts, replace PCM and repeat QUICK TEST.
  28. 30) Check Vacuum Hoses  Turn ignition off. Disconnect vacuum hose from air injection by-pass solenoid. Connect vacuum hose to vacuum pump. Start engine and allow to idle. If vacuum is 15 in. Hg or more at idle, reconnect vacuum hose to air injection by-pass solenoid and go to next step. If vacuum less than 15 in. Hg, replace vacuum hose and repeat QUICK TEST .
  29. 31) Check Air By-Pass Solenoid  Disconnect air injection by-pass solenoid wiring harness connector. Connect scan tester to DLC. Turn ignition on. Using scan tester, access Output Test Mode (OTM). Connect voltmeter to air injection by-pass solenoid connector. Observe voltmeter while operating throttle. If voltage cycles 0.5 volt or more, go to next step. If voltage does not cycle 0.5 volt or more, go to step 35).
  30. 32)  Remain in OTM. Reconnect air injection by-pass solenoid wiring harness connector. Disconnect vacuum hose from air injection by-pass solenoid. Connect vacuum hose to vacuum pump. Apply 16 in Hg. to solenoid. Apply and release throttle. If vacuum releases as throttle cycles, repair vacuum hose between solenoid and air control valve. If vacuum does not release as throttle cycles, check solenoid vacuum supply hose. If hose is okay, replace air injection by-pass solenoid hose.
    NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 32) to step 35). No test procedures have been omitted.
  31. 35) Check Air By-Pass Solenoid Resistance  Turn ignition off. Disconnect air injection by-pass solenoid wiring harness connector. Measure resistance between connector terminals. If resistance is 50-100 ohms, go to next step. If resistance is not 50-100 ohms, replace air injection by-pass solenoid.
  32. 36) Check BATT+ Circuit Voltage  Leave air injection by-pass solenoid disconnected. Turn ignition on. Measure voltage between connector BATT+ terminal and negative battery terminal. If voltage is 10.5 volts or more, go to next step. If voltage is less than 10.5 volts, repair open in BATT+ circuit and repeat QUICK TEST .
  33. 37) Check EAIR Circuit Continuity  Leave air injection by-pass solenoid disconnected. Turn ignition off. Disconnect SSR wiring harness connector. Disconnect PCM 104-pin connector. Inspect for damaged pins and repair if necessary. Connect EEC-V Breakout Box (014-000950), leaving PCM disconnected. Measure resistance between test pin No. 70 at breakout box and EAIR terminal at air pump connector. If resistance is 5 ohms or more, repair open in EAIR circuit and repeat QUICK TEST . If resistance is less than 5 ohms, go to next step.
  34. 38) Check EAIR Circuit For Short To Ground  Turn ignition off. Leave air injection by-pass solenoid and SSR disconnected. Measure resistance between test pin No. 70 and test pins No. 51, 76 and 91 at breakout box. If each resistance measurement is 10,000 ohms or more, go to next step. If any resistance measurement is less than 10,000 ohms, repair EAIR circuit short to ground and repeat QUICK TEST .
  35. 39) Check EAIR Circuit For Short To Power  Leave ignition off. Leave air injection by-pass solenoid and SSR disconnected. Measure resistance between test pin No. 70 and test pins No. 71 and 97 at breakout box. If each resistance measurement is 10,000 ohms or more, replace PCM and repeat QUICK TEST .
  36. 40) Diagnostic Trouble Code (DTC) P0411  DTC P0411 indicates that Secondary Air is not being diverted when requested. Possible causes include:
    • Vacuum hoses are damaged.
    • AIRB/AIRD valve is inoperative.
    • Air Pump is inoperative.
    • AIRB/AIRD solenoids are damaged.

    Visually inspect the vacuum lines for disconnects in the AIR system. Visually inspect for proper vacuum line routing. Refer to VECI decal. Visually inspect Air pump for broken or loose Air Pump Belt. See step 81) for adjustment or replacement. If any problems were found, service as necessary and repeat QUICK TEST . If no problems were found, go to next step.

  37. 41) Check AIR vacuum lines  Carefully inspect the vacuum lines in the following places:
    • between AIRB solenoid and AIRB valve.
    • between AIRD solenoid and AIRD valve.
    • between Manifold Vacuum TREE and AIRB/AIRD solenoids.

    Check for obstructions, cracks, kinks, leaks, etc. If all vacuum lines are in good condition, see step 42) (vehicles with a single AIRB valve), step 47) (vehicles with a single AIRD valve or both valves), or step 55) (vehicles with a single combination AIRD/AIRB valve). For all vehicles, if any vacuum lines are not in good condition, service as necessary and repeat QUICK TEST .

  38. 42) Check for vacuum at the AIRB valve  Turn ignition off. Disconnect control vacuum line from the AIRB valve. Start engine and warm to normal operating temperature. Check for vacuum at control vacuum line. If vacuum is present, see step 43). If vacuum is not present, see step 63).
  39. 43) Inspect AIRB valve  Turn ignition off. Disconnect air hose at AIRB valve outlet. Inspect AIRB valve outlet for damage from hot exhaust gas. If AIRB valve is damaged, replace AIRB valve and see step 60) to inspect air check valve. If AIRB valve is not damaged, go to next step.
  40. 44) Check AIRB valve diaphragm  Connect auxiliary vacuum source to AIRB valve. Apply 34 kPa (10 in. Hg) vacuum and trap. If valve holds vacuum, leave vacuum applied and see step 45). If valve does not hold vacuum, replace AIRB valve and verify that a symptom no longer exists.
  41. 45) Check AIRB operation/flow  Start engine and raise speed to 1500 RPM. Listen or feel for air flow at valve outlet. If air flow is present, see step 46). If no air flow is present, see step 71) to check air pump operation and belt.
  42. 46) Check AIRB operation/dump  Vent auxiliary vacuum source to zero. Listen or feel for air flow switching from the valve outlet to the dump port or silencer ports. If air flow is switching, see step 47). If air flow is not switching, replace AIRB valve.
  43. 47) Visually inspect AIRD valve  Turn ignition off. Disconnect hoses from AIRD valve outlets. Inspect outlets for damage from hot exhaust gases. If AIRD valve is damaged, replace AIRD valve and see step 60) for air check valve. If AIRD valve is okay, go to next step.
    NOTE: Steps 48) and 49) require attention to time.
  44. 48) Check for vacuum at AIRD valve  Leave ignition off. Disconnect vacuum supply line from vacuum nipple on valve. Start engine and warm to normal operating temperature. After starting engine, check for vacuum. If vacuum is present after a 10 second delay, go to next step. If vacuum is not present after a 10 second delay, see step 63) to verify solenoid AIRD vacuum function.
  45. 49) Check AIRD valve diaphragm  Connect an auxiliary vacuum source to the AIRD valve. Apply 34 kPa (10 in. Hg) vacuum and hold. If valve holds vacuum, go to next step. If valve does not hold vacuum, replace AIRD valve and verify that a symptom no longer exists.
  46. 50) Check for air supply at AIRD valve  Start engine and warm to normal operating temperature. Verify that air is being supplied to the AIRD valve. If air is present, go to next step. If air is not present, see step 71) for AIR pump operation.
  47. 51) Check for air at AIRD outlet(s)  Leave engine running. Apply 34 kPa (10 in. Hg) of vacuum to AIRD valve. Raise engine speed to 1500 RPM. If air flow comes out of the valve outlet, go to next step. If no air flow comes out of outlet, replace AIRD valve and verify that a symptom no longer exists.
  48. 52) Check for air at other AIRD outlet  Leave engine running. Vent the auxiliary vacuum source to zero. If air flow switches from one outlet to the other outlet, see step 63). If air flow does not switch from one outlet to the other, replace AIRD valve and verify that a symptom no longer exists.
    NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 52) to step 55). No test procedures have been omitted.
  49. 55) Visually inspect combination AIRB/AIRD valve  Turn ignition off. Disconnect hoses from combination Air Control Valve outlets. Inspect outlets for damage from hot exhaust gases. If valve appears to be damaged, replace combination AIRB/AIRD valve and see step 60) to verify check valve function. If valve does not appear to be damaged, go to next step.
  50. 56) Check combination AIRB/AIRD valve  Leave ignition off and outlet hoses disconnected. Disconnect and plug the air bypass vacuum supply line. Start engine and raise speed to 1500 RPM. If air flow is present at combination air control vents, go to next step. If air flow is not present at combination air control vents, see step 71) to verify AIR Pump function. If AIR Pump function is okay, replace combination AIRB/AIRD valve.
  51. 57) Check for manifold vacuum  Start engine and allow to idle. Disconnect both the air bypass and air diverter vacuum supply lines. Measure manifold vacuum at both supply lines. Measure vacuum at air diverter supply line for 5-30 seconds after starting (while engine idle stabilizes). Measure vacuum at air bypass line (timing is not critical). If appropriate manifold vacuum is present, go to next step. If appropriate manifold vacuum is not present, see step 63).
  52. 58) Check combination AIRB/AIRD valve operation  Turn ignition off. Reconnect the air bypass vacuum supply line. Disconnect and plug air diverter vacuum supply line. Start engine and raise speed to 1500 RPM. If air flow is present at one outlet and no air flow is present at the other outlet, go to next step. If air flow is present at both outlets or no air flow is present at either outlet, replace combination AIRB/AIRD valve, reconnect all hoses and verify that a symptom no longer exists.
    NOTE: If the combination valve is a bleed type valve, the amount of air flow will be affected.
  53. 59) Check combination AIRB/AIRD valve operation with vacuum applied  Turn ignition off. Unplug air diverter vacuum supply line and leave disconnected. Apply 27-34 kPa (8-10 in. Hg) vacuum to air diverter nipple on the combination valve. Start engine and raise speed to 1500 RPM. If air flow is present at valve outlet, see step 63). If no air flow is present at valve outlet, replace combination AIRB/AIRD valve and verify the a symptom no longer exists.
  54. 60) Visually inspect check valve system (externally)  Turn ignition off. Visually inspect secondary air hoses, tubes, control valves and check valves for leaks or external signs of damage (from back flow of hot exhaust gases). If hoses and valves are intact, go to next step. If hoses or valves are not intact, service or replace damaged parts including check valve, and verify that a symptom no longer exists.
  55. 61) Visually inspect hoses at valves (internally)  Remove hose from check valve inlet. Inspect inside the hose for damage from hot exhaust gas. If the hose is clean and undamaged, go to next step. If the hose is dirty or damaged, replace hose, replace check valve and verify that a symptom no longer exists.
  56. 62) Inspect check valve function  Start engine and allow to idle. Listen for escaping exhaust gas, or feel for gas (only if engine temperature is at an acceptable level). If any exhaust gas is escaping, replace check valve and verify that a symptom no longer exists. If no exhaust gas is escaping, check for other possible fault causes.
    NOTE: Check valve may "burble" as air is drawn in.
  57. 63) Check AIRB and AIRD solenoids electrical operation  Connect Scan Tool. Set DVOM to 20 volt scale. Select OUTPUT TEST MODE (DTM). See SELF-DIAGNOSTIC SYSTEM . Disconnect suspect solenoid. Connect DVOM positive test lead to VPWR circuit and negative test lead to signal circuit of suspect vehicle harness connector. While observing DVOM, turn outputs on, then turn outputs off. If the solenoid circuit cycles voltage, go to next step. If the solenoid circuit does not cycle voltage, remove jumper and see step 76).
  58. 64) Check vacuum supply to AIRD/AIRB solenoid  Turn ignition off. Disconnect vacuum inlet line at suspect (AIRD/AIRB) solenoid. Start engine and allow to idle. Check vacuum at line. If vacuum is present, replace AIRB or AIRD solenoid. Reconnect all components. Clear DTCs. See CLEARING CODES . Repeat QUICK TEST . If vacuum is not present, go to next step.
    NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 64) to step 66). No test procedures have been omitted.
  59. 66) Check vacuum supply to reservoir  Leave ignition off. Disconnect vacuum inlet line at reservoir.Start engine. Check for vacuum on line. If vacuum is present, see step 68). On vehicles with a check valve, if vacuum is not present, see step 69). On vehicles without a check valve, if vacuum is not present, inspect vacuum line for leaks, blockages, etc. and repair or replace as necessary. Verify that a symptom no longer exists.
    NOTE: For single piece connector, this port is marked "man" or "vac".
    NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 66) to step 68). No test procedures have been omitted.
  60. 68) Check reservoir to hold vacuum  Turn ignition off. Connect vacuum gauge to outlet port (not marked "man" or "vac"), keeping inlet line connected to vacuum port. Start engine and allow to idle for 30 seconds. If gauge increases to approximately 15-20 in. Hg, replace reservoir outlet hose. If problem is still present, check for other possible fault causes. If gauge does not increase to approximately 15-20 in. Hg, replace vacuum reservoir and verify that a symptom no longer exists.
  61. 69) Check air flow at check valve  Turn ignition off. Disconnect check valve from vacuum lines (note which direction check valve is installed). Connect auxiliary vacuum source to black side of check valve. Connect vacuum gauge to opposite side of check valve. Apply 54 kPa (16 in. Hg) vacuum to black side. If gauge indicated 54 kPa (16 in. Hg), go to next step. If gauge does not indicate 54 kPa (16 in. Hg), replace check valve and verify that a symptom no longer exists.
  62. 70) Verify check valve's ability to hold vacuum  Leave ignition off. Disconnect auxiliary vacuum source from check valve. If vacuum gauge reading remains above 50 kPa (15 in. Hg) for 10 seconds, check for other possible fault causes. If vacuum gauge reading does not remain above 50 kPa (15 in. Hg) for 10 seconds, replace check valve and verify that a symptom no longer exists.
    CAUTION: DO NOT  pry on pump to adjust belt. The aluminum housing is likely to collapse. Refer to AIR pump drive belt adjustment.
  63. 71) Check belt tension  Turn ignition off. Check belt tension. If belt tension is adjusted properly, go to next step. If belt tension is not adjusted properly, use Belt Tension Gauge T63L-8620-A to measure tension. Tighten to specification using Tool T75L09480-A.
  64. 72) Check air pump operation  Leave ignition off. Disconnect air supply hose from AIRB valve. Start engine. Check air flow at the pump outlet. If air flow increases as engine speed increases, check for other possible fault causes. On vehicles equipped with silencer/filter, if air flow does not increase as engine speed increases, go to next step. On vehicles not equipped with silencer/filter, if air flow does not increase as engine speed increases, replace air pump.
  65. 73) Check silencer/filter for obstruction  Disconnect inlet hose (if equipped). Inspect inlet of silencer/filter for blockage (bugs, leaves, debris, etc.). If inlet is open, replace air pump and verify that a symptom no longer exists.
    NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 73) to step 75). No test procedures have been omitted.
  66. 75) DTCs P0413, P0414, P0416 and P0417: Check voltage of VPWR circuit  DTCs P0413, P0414, P0416 and P0417 indicate that voltage output for Secondary Air Injection solenoid(s) did not change when activated. Possible causes include:
    • AIRB/AIRD circuits shorted to power.
    • AIRB/AIRD circuits open or shorted to ground.
    • AIRB/AIRD resistance out of range.
    • Damaged Powertrain Control Module (PCM).

    Disconnect AIRB/AIRD solenoid connector. Turn ignition on, but leave engine off. Measure voltage between VPWR circuit and battery ground of one solenoid, then repeat for the other solenoid. If each voltage is greater than 10.5 volts, go to next step. If either voltage is 10.5 volts or less, service open harness circuit. Reconnect both solenoids and repeat QUICK TEST .

  67. 76) Measure AIRB/AIRD solenoid resistance  Turn ignition off. Disconnect both the AIRB/AIRD solenoid connectors and measure both solenoid resistance. If each resistance is between 50 and 100 ohms, go to next step. If either resistance is not between 50 and 100 ohms, replace AIRB/AIRD solenoid assembly. Reconnect both solenoids and repeat QUICK TEST .
  68. 77) Check circuit continuity  Leave ignition off. Disconnect Powertrain Control Module (PCM). Inspect for damaged or pushed out pins, corrosion, loose wires, etc. Service as necessary. Install breakout box, leaving PCM disconnected. Measure resistance between AIRB circuit at breakout box and AIRB circuit at vehicle harness connector. Measure resistance between AIRD circuit at the breakout box and AIRD circuit at vehicle harness connector. If each resistance is less than 5.0 ohms, go to next step. If either resistance is 5.0 ohms or greater, service open harness circuit. Remove breakout box. Reconnect PCM and both solenoids. Repeat QUICK TEST .
  69. 78) Check for short to ground  Leave ignition off, breakout box installed and PCM disconnected. Disconnect Scan Tool. Disconnect both AIRB/AIRD solenoids. Measure resistance between AIRB circuit at the breakout box and Test Pins No. 51, 91 and 103. Measure resistance between AIRD circuit at the breakout box and Test Pins No. 51, 91 and 103 at the breakout box. If each resistance is greater than 10k ohms, go to next step. If any resistance is 10k ohms or less, locate and repair short to ground. Remove breakout box. Reconnect PCM and AIRB/AIRD solenoids. Repeat QUICK TEST .
  70. 79) Check for short to power  Leave ignition off, breakout box installed, PCM disconnected and both AIRB/AIRD solenoids disconnected. Measure resistance between AIRB circuit at the breakout box and Test Pins No. 71 and 97. Measure resistance between AIRD circuit at the breakout box and Test Pins No. 71 and 97 at the breakout box. If each resistance is greater than 10k ohms, replace PCM. Remove breakout box, reconnect both solenoids and repeat QUICK TEST . If any resistance is 10k ohms or less, locate and repair short to power. Remove breakout box. Reconnect PCM and AIRB/AIRD solenoids. Repeat QUICK TEST. If DTC is present, replace PCM.
    NOTE: A rolling idle may be caused by a leaky AIR solenoid. QUICK TEST  may also indicate DTCs P0411, P0413, P1414, P0416 or P0417.
  71. 80) Check AIR solenoid  Start engine and run until temperature is fully stabilized. Turn engine off. Disconnect vacuum hose at the AIR solenoid. Plug vacuum hose. Restart engine. After a few minutes of idling, the "rolling" idle should stop. If no rolling idle is present, unplug vacuum hose and verify that vacuum is present. If rolling idle stops or if vacuum is present, replace Secondary AIR solenoid assembly. If vacuum is not present or if rolling idle is still present, check for other possible fault causes. If vacuum is not present or if DTC P0411 is present, go to step 66).
    CAUTION: DO NOT  use pry bar to move the air pump for belt adjustment.
  72. 81) Excessive belt noise  Possible causes include:
    • Loose belt.
    • Seized pump.
    • Loose pulley.
    • Loose or broken mounting brackets or bolts.
  73. 82) Check loose pulley, mounting brackets  Check for loose pulley and mounting brackets. Check for seized air pump. Check for broken bolts. If above components are all okay, check for other possible fault causes. If pump is seized, replace pump. If any bolts or brackets are loose or broken, replace as necessary and tighten bolts to 13.6-17.0 N.m (120-150 INCH lbs.).
  74. 83) Check for excessive air noise  Inspect for loose belt. Use Belt Tension Gauge T63L-8620-A to measure belt tension. If belt is loose, tighten to specification using Tool T75L09480-A. Verify that a symptom no longer exists. If belt is not loose, go to next step.
    NOTE: The Secondary AIR system is not completely noiseless. To determine if the AIR system is the root cause, proceed with the following step.

    Listen for any of the following noises: chirps, squeaks, ticks, putt-putt, hiss, rap or roar. If any of these noises are present, see step 81) to verify that the belt tension is correct. Disconnect the belt drive. Start engine and allow to idle. If the noise disappears, replace any cracked or worn hoses. Tighten mounting bolts to 34 N.m (25 ft. lbs.). DO NOT  overtighten. Check air pump fittings and service as necessary. Reconnect belt and tighten to specification. Verify that a symptom no longer exists. If noise is still present, reconnect belt and tighten to specification.

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