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Home >> Cadillac >> 1998 >> Catera >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Tests W/Codes >> Diagnostic Trouble Codes >> DTC P0410 - Air System Constant Flow Detected >> Diagnostic Procedures
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Diagnostic Procedures

  1. Perform POWERTRAIN ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK  , then go to next step.
  2. Start engine. Allow engine to enter closed loop operation. Using scan tool, command AIR pump relay on and off. If AIR pump turns on and off, go to step 6). If AIR pump does not turn on and off, go to next step.
  3. Remove AIR pump relay. If AIR pump is off, go to next step. If AIR pump is on, go to step 9).
  4. Using test light connected to battery voltage, probe relay control circuit. Using scan tool, command AIR pump relay on and off. If test light turns on and off, go to step 11). If test light does not turn on and off, go to next step.
  5. Turn ignition off. Disconnect ECM connector located in engine compartment, in relay center. Using test light connected to battery voltage, probe relay control circuit. If test light is on, go to step 10). If test light is off, go to step 14).
  6. Remove AIR cutoff valve. Attempt to blow through cutoff valve. If valve is stuck open, go to step 13). If valve is not stuck open, go to next step.
  7. Disconnect vacuum hose at actuator. Using scan tool, command AIR solenoid valve on and off. If vacuum is present when solenoid valve is off, go to step 12). If vacuum is not present when solenoid valve is off, go to next step.
  8. Check for loose or disconnected AIR hoses and pipes, evidence of heat damage or burnt hoses, or rusted or damaged check valves and pipes. Repair components as necessary. After repairs, go to step 15). If all components are okay, see DIAGNOSTIC AIDS.
  9. Repair short to voltage in AIR pump feed circuit between AIR pump and AIR pump relay. After repairs, go to step 15).
  10. Repair short to ground in relay control circuit. After repairs, go to step 15).
  11. Replace relay. After replacing relay, go to step 15).
  12. Replace solenoid valve. After repairs, go to step 15).
  13. Replace AIR cutoff valve/actuator assembly. After repairs, go to step 15).
  14. Replace ECM. New ECM must be programmed with theft deterrent module frequency code currently on vehicle. After replacing ECM, go to next step.
  15. Using scan tool, clear DTCs. Turn ignition off for 15 seconds. Start engine and operate vehicle. Check for DTCs. If DTC P0410 is set, go to step 2). If DTC P0410 is not set, go to next step.
  16. If other DTCs were present during OBD system check and have not been diagnosed, go to applicable DTC. If no other DTCs are present, system is okay.
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