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Home >> Chevrolet >> 2001 >> Camaro Base, 2D Convertible, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 7 (Engine Control System Self-Diagnostics - 5.7L) >> Diagnostic Tests >> DTC P0418: Secondary Air Injection (Air) Pump Relay Control Circuit >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different car, the 2000 Pontiac Firebird, 2000 Chevrolet Corvette, and 2000 Chevrolet Camaro. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. After performing OBD system check, go to next step.
  2. Check AIR pump fuse. If fuse is open, diagnose using DTC P0410 test. See DTC P0410: SECONDARY AIR INJECTION (AIR) SYSTEM . If fuse is okay, go to next step.
  3. Turn ignition on, with engine off. Using scan tool, command AIR pump relay on and off. If AIR pump relay turns on and off with each command, go to next step. If AIR pump relay does not turn on and off with each command, go to step  5.
  4. Using scan tool, review FREEZE FRAME and/or FAILURE RECORDS data for this DTC. Turn ignition on for 30 seconds. Start engine. Operate vehicle within conditions for setting this DTC. If this DTC resets, go to next step. If this DTC does not reset, see DIAGNOSTIC AIDS .
  5. Turn ignition off. Disconnect AIR pump relay. Turn ignition on, with engine off. Using a test light connected to ground, probe AIR pump battery supply circuit. If test light illuminates, go to next step. If test light does not illuminate, go to step  12.
  6. Connect test light between control circuit of AIR pump relay and battery supply circuit of AIR pump relay. Using scan tool, command AIR pump relay on a on off. If test light turns on and off with each command, go to step  10. If test light does not turn on and off with each command, go to next step.
  7. If test light remains illuminated with each command, go to step  9. If test light does not remain illuminated with each command, go to next step.
  8. Check control circuit of AIR pump relay for short to voltage or open circuit. Repair as necessary. After repairs, go to step  15. If circuit is okay, go to step  11.
  9. Check control circuit of AIR pump relay for short to ground. Repair as necessary. After repairs, go to step  15. If circuit is okay, go to step  14.
  10. Check for poor connections at AIR pump relay. Repair as necessary. After repairs, go to step  15. If connections are okay, go to step  13.
  11. Check for poor connections at PCM. Repair as necessary. After repairs, go to step  15. If connections are okay, go to step  14.
  12. Repair battery supply circuit for AIR pump relay. After repairs, go to step  15.
  13. Replace AIR pump relay. After replacing relay, go to step  15.
  14. Replace PCM. Program replacement PCM using required equipment. After replacing PCM, go to next step.
  15. Using scan tool, select DTC, CLEAR INFO function. Start and warm engine to normal operating temperature. Select DTC, SPECIFIC, then enter this DTC. Operate vehicle within conditions for setting this DTC. If scan tool indicates that this test ran and passed, go to next step. If scan tool does not indicate that this test ran and passed, repeat step  2.
  16. Using scan tool, select CAPTURE INFO, REVIEW INFO function. If any undiagnosed DTCs are displayed, go to applicable DTC test.
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