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Home >> Chevrolet >> 2012 >> Camaro ZL1, Automatic Trans >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls/Fuel - 6.2L - DTC P0010 To DTC P0340 >> Diagnostic Information and Procedures >> DTC P012B >> Circuit/System Verification

Circuit/System Verification

  1. If you were sent here from DTC P0101, P0106, P0121 or P1101, refer to Circuit/System Testing .
  2. Verify DTC P006D, P012C, P012D, P0641, P2227, P2228, or P2229 is not set.
  3. Ignition ON.
  4. Verify the scan tool Throttle Body Idle Airflow Compensation parameter is less than 90 %.
    • If less than 90 % 
    5. NOTE:

    If the Throttle Sweep Test is not available on the scan tool, observe the scan tool Throttle Position Sensor 1 and 2 Agree/Disagree parameter while performing the following tests:

    • Slowly depress the accelerator pedal to wide open throttle (WOT) and then slowly return the pedal to closed throttle. Repeat the procedure several times.
    • Rapidly depress the accelerator pedal from the rest position to WOT and release pedal. Repeat the procedure several times.
  5. Verify the scan tool Throttle Position Sensors 1 and 2 Agree/Disagree parameter displays Agree while performing the Throttle Sweep Test with a scan tool.
    • If Agree 
  6. Verify the scan tool MAP Sensor pressure parameter is within the range specified in the Altitude Versus Barometric Pressure table.
    • The pressure is within range 
  7. Verify the scan tool Supercharger Inlet Pressure Sensor pressure parameter is within range specified in the Altitude Versus Barometric Pressure table.
    • The pressure is within range 
  8. Verify the Supercharger Inlet Pressure Sensor pressure parameter decreases after starting the engine.
    • The pressure decreases 
  9. Verify the scan tool MAP Sensor pressure parameter is between 26-52 kPa (3.8-7.5 psi) and changes with accelerator pedal input.
    • If between 26-52 kPa (3.8-7.5 psi) and changes 
  10. Verify the scan tool MAF Sensor g/s parameter changes smoothly and gradually as the engine speed is increased and decreased while performing the actions listed below.
    1. Engine idling
    2. Perform the scan tool snapshot function.
    3. Increase the engine speed slowly to 3,000 RPM and then back to idle.
    4. Exit from the scan tool snapshot and review the data.
    5. Observe the MAF Sensor parameter frame by frame with a scan tool.
    • The parameter changes smoothly and gradually 
  11. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
  12. Verify a DTC does not set.
    • If no DTCs set 
  13. All OK
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