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Diagnostic Procedures

WARNING: This page is about a different car, the 2003 Mazda Tribute. However, it is still accessible from the selected car via links, so may be relevant.
  1. If QUICK TEST was not performed, go to QUICK TEST  under SELF-DIAGNOSTIC SYSTEM. If QUICK TEST was performed, go to next step.
  2. DTC P0320: Erratic Ignition -  Check for following:
    • Arcing secondary ignition components (coil, wires, plugs).
    • Loose wires/connectors.
    • 2-way radio (if equipped). Verify all 2-way radio installations regarding routing of antenna and power leads. Carefully follow manufacturer's installation instructions.

    If any of these faults are present, repair as necessary. After repair, go to step  25. If these possible causes are not present:

    • For no start condition, refer to NO START  testing under SYSTEM TESTS.
    • For intermittent condition, refer to INTERMITTENT  testing under SYSTEM TESTS.
    • For all other conditions, go to next step.

  3. Check CKP(+)/CKP(-) Continuity -  Disconnect CKP sensor 2-pin harness connector and PCM 104-pin harness connector. Connect Breakout Box (49-UN01-130) to PCM harness connector only. See Figure. Measure resistance of CKP(+) circuit (Black/Pink wire) between breakout box terminal No. 21 and CKP sensor harness connector. See Fig 1. Measure resistance of CKP(-) circuit between breakout box terminal No. 22 and CKP sensor harness connector (Gray/Yellow wire). If each resistance reading is more than 5 ohms, repair open circuit in suspect wire. See appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS. After repair, go to step  25. If resistance reading is not as specified, go to next step.
    Fig 1: Identifying CKP Sensor Circuits & Harness Connector Terminals
    G00013292Courtesy of FORD MOTOR CO.
  4. Check For CKP(+) Bias Voltage Fault -  Remove breakout box. Reconnect PCM 104-pin harness connector. Turn ignition on, engine off. Measure voltage between CKP(+) terminal (Black/Pink wire) at CKP harness connector and negative battery terminal. Turn ignition off. If voltage reading was 1-2 volts, go to next step. If voltage reading is not as specified, go to step  17.
  5. Check For CKP(-) Bias Voltage Fault -  Turn ignition on, engine off. Measure voltage between CKP(-) terminal (Gray/Yellow wire) at CKP sensor harness connector and negative battery terminal. Turn ignition off. If voltage reading is 1-2 volts, go to step  9. If voltage reading is not as specified, bias fault is present. Go to next step.
  6. Determine If Bias High Or Bias Low Fault -  If bias voltage reading for CKP(-) circuit is less than one volt (bias low fault), go to next step. If bias voltage reading is more than 2 volts (bias high fault), go to step  8.
  7. Check For CKP(-) Short To Ground In Harness -  Disconnect PCM 104-pin harness connector. Connect Breakout Box (49-UN01-130) to PCM harness connector only. See Figure. Measure resistance of CKP(-) circuit between breakout box terminal No. 22 and negative battery terminal. If resistance reading is more than 10,000 ohms, replace PCM. After repair, go to step  25. If resistance reading is not as specified, repair short circuit in Gray/Yellow wire between PCM 104-pin harness connector and CKP sensor harness connector. See appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS. After repair, go to step  25.
  8. Check For CKP(-) Short To Power In Harness -  Disconnect PCM 104-pin harness connector. Connect Breakout Box (49-UN01-130) to PCM harness connector only. See Figure. Turn ignition on, engine off. Measure voltage of CKP(-) circuit (Gray/Yellow wire) between breakout box terminal No. 22 and negative battery terminal. If voltage reading is less than 0.5 volt, replace PCM. After repair, go to step  25. If voltage reading is not less than 0.5 volt repair short circuit to power in Gray/Yellow wire between PCM 104-pin harness connector terminal No. 22 and CKP sensor harness connector. See appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS. After repair, go to step  25.
  9. Check CKP Sensor Amplitude At PCM -  Disconnect PCM 104-pin harness connector. Connect Breakout Box (49-UN01-130) to PCM harness connector only. See Figure. Measure voltage between breakout box terminal No. 21 (CKP+) and terminal No. 22 (CKP-) while cranking engine. If settled AC voltage reading was more than 0.4 volt, go to next step. If settled AC voltage reading was not as specified, amplitude fault is present. Go to step  11.
  10. Check CKP(+) Circuit For Short To Ground At Sensor -  Measure resistance of CKP(+) circuit between breakout box terminal No. 21 and negative battery terminal. If resistance reading is more than 10,000 ohms, go to step  20. If resistance reading is not as specified, go to step  15.
  11. Check CKP Circuit Resistance For Amplitude Fault -  Measure resistance between breakout box terminal No. 21 (CKP+) and terminal No. 22 (CKP-). If resistance reading is 300-800 ohms, go to step  14. If resistance reading is not as specified, go to next step.
  12. Determine If Resistance High Or Resistance Low Fault -  If resistance reading between CKP(+) and CKP(-) was less than 300 ohms, low resistance fault is present. Go to next step. If resistance reading was not as specified, replace CKP sensor. After repair, go to step  25.
  13. Check CKP(+) For Short To CKP(-) -  Disconnect CKP sensor. Measure resistance between CKP(+) and CKP(-) at CKP sensor harness connector. If resistance reading is less than 5 ohms, repair short circuit in suspect wire. See appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS. After repair, go to step  25. If resistance reading is not as specified, replace CKP sensor. After repair, go to step  25.
  14. Check CKP Sensor & Pulse Wheel -  Visually inspect pulse wheel and CKP sensor for damage. If CKP sensor and pulse wheel are okay, replace CKP sensor. After repair, go to step  25. If CKP sensor or pulse wheel are damaged, repair or replace damaged parts. After repair, go to step  25.
  15. Check For Open Or Short In PCM -  Disconnect CKP sensor 2-pin harness connector. Remove Breakout Box. Reconnect PCM 104-pin harness connector to PCM. Measure resistance between CKP(+) and CKP(-) circuits at CKP sensor harness connector. If resistance reading is 16,000-24,000 ohms, go to next step. If resistance reading is not as specified, replace PCM. After repair, go to step  25.
  16. Check CKP(+) For Short To CKP(-) -  Disconnect PCM 104-pin harness connector. Connect Breakout Box (49-UN01-130) to PCM harness connector only. See Figure. Measure resistance between CKP(+) and CKP(-) circuits at CKP sensor harness connector. If resistance reading is more than 1000 ohms, replace CKP sensor. After repair, go to step  25. If resistance reading is less than 1000 ohms, repair short circuit. See appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS. After repair, go to step  25.
  17. Determine If Bias Voltage High Or Bias Voltage Low Fault -  If bias voltage reading was less than one volt, low bias fault is present. Go to next step. If bias voltage reading was more than one volt, high bias fault is present. Go to step  19.
  18. Check CKP(+) Circuit For Short To Ground In Harness -  Disconnect PCM 104-pin harness connector. Connect Breakout Box (49-UN01-130) to PCM harness connector only. See Figure. Measure resistance between breakout box terminal No. 21 (CKP+) and negative battery terminal. If resistance reading is more than 10,000 ohms, replace PCM. After repair, go to step  25. If resistance reading is not as specified, repair short circuit in Black/Pink wire between PCM 104-pin harness connector terminal No. 21 and CKP sensor harness connector. See appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS. After repair, go to step  25.
  19. Check CKP(+) Circuit For Short To Power In Harness -  Disconnect PCM 104-pin harness connector. Connect Breakout Box (49-UN01-130) to PCM harness connector only. See Figure. Turn ignition on, engine off. Measure voltage between breakout box terminal No. 21 (CKP+) and negative battery terminal. If voltage reading is less than 0.5 volt, replace PCM. After repair, go to step  25. If voltage reading is more than 0.5 volt, repair short circuit to power on Pink/Black wire between PCM 104-pin harness connector terminal No. 21 and CKP sensor harness connector. See appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS. After repair, go to step  25.
  20. Visual Inspection Of Ignition System -  Visually inspect engine compartment to make sure all coils and spark plug wires are secured properly. Check all wiring harnesses and connectors for damaged, burned or overheated insulation and loose or broken connections. Ensure battery is fully charged. Verify all accessories are off. If no problem is indicated, go to next step. If a problem is indicated, repair as necessary. After repair, go to step  25.
  21. DTC P0301 - P0306: Misfire On Specific Cylinder -  Are DTCS P0301-P0306 present, go to DTC P0300, DTC P0301, DTC P0302, DTC P0303, DTC P0304, DTC P0305, DTC P0306, DTC P0315 OR DTC P0316 . If DTCs P0301-P0306 are not present, go to next step.
  22. Check For Spark At All Cylinders -  On 2.0L, disable Inertia Fuel Shutoff (IFS) switch. Check for spark at each cylinder while cranking engine. If bluish white spark is consistent between all cylinders, turn ignition off. Go to next step. If bluish white spark is not consistent between all cylinders, turn ignition off. Inspect plug wires. Measure resistance of spark plug wires and replace them if resistance reading is more than 7000 ohms per foot. After repair, go to step  25. On 3.0L, inspect condition of ignition coils. See IGNITION CHECKS in BASIC DIAGNOSTIC PROCEDURES article. If ignition coils are okay, go to next step. If any ignition coil is faulty, replace suspect ignition coil. After repair, go to step  25.
  23. Check Spark Plugs -  Remove and inspect spark plugs for damage, wear, carbon deposits and proper plug gap. If spark plugs are okay, go to next step. If spark plugs are not okay, clean spark plugs or regap. Replace if necessary. After repair, go to step  25.
  24. Check Spark Plug Resistance -  Measure spark plug resistance. If resistance reading is 2000-20,000 ohms, fault is intermittent. Refer to INTERMITTENT  testing under SYSTEM TESTS. If resistance reading is not as specified, replace spark plugs. After repair, go to next step.
  25. Verify Trouble Shooting Of DTCs Completed -  Perform QUICK TEST  under SELF-DIAGNOSTIC SYSTEM. If any DTC is present, go to applicable procedure for other DTCs. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no DTCs are set, trouble shooting is complete.
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