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Home >> Chevrolet >> 2023 >> Camaro ZL1, 2D Convertible, Standard Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 21 (Engine Controls And Fuel - 3.6L - Diagnostic Information And Procedures (1 Of 2)) >> Diagnostic Information and Procedures >> DTC P0068, P0101, P0106, P0121, P0236, or P1101 >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different variant/trim than selected.
  1. Ignition - On/Vehicle - In Service Mode
  2. Verify there are no DTCs set related to the following component/system:
    • B74 Manifold Absolute Pressure Sensor
    • B75C Multifunction Intake Air Sensor
    • 5V Reference Circuit
    • Throttle Position Sensor@Q38 Throttle Body
    • Go to next step: If a related DTC is not set 
  3. Verify the scan tool parameter: Throttle Body Idle Air Flow Compensation = Less than 90%
    • Go to next step: If less than 90% 
  4. Perform the scan tool control function: Throttle Sweep - From 0 to 98% and back to 0%.

    Verify the scan tool parameter: Throttle Position Sensors 1 and 2 = Agree

    • Go to next step: If the specified state 
  5. Verify the scan tool parameter: MAP Sensor = The value should be within the range listed in the table: Altitude Versus Barometric Pressure
    • Go to next step: If in the specified range 
  6. Verify the tool is available: GE-52250 Variable Pressure Leak Detector
    • If the tool is not available 

      Refer to step 8

    • Go to next step: If the tool is available 
  7. Perform the following procedure/test: Component/System Leak Test

    Verify the procedure/test passes.

    • If the procedure/test does not pass 

      Repair or replace as necessary

    • Go to next step: If the procedure/test passes 
  8. Verify the following conditions do not exist:
    • B74 Manifold Absolute Pressure Sensor - Leaking @O-Ring - Missing/Visible Damage
    • B75C Multifunction Intake Air Sensor - Contamination of the measuring element/Cracked/Loose Clamps/Visible Damage/Water intrusion
    • Q38 Throttle Body
      • Coking/Loose Clamps/Visible Damage
      • Restricted - Moisture/Ice
    • Air Cleaner Element - Dirty/Restricted
    • Catalytic Converter - Blocked/Restricted/Visible Damage
    • Engine - Mechanical Condition - Refer to: Symptoms - Engine Mechanical
    • Exhaust System - Leaking/Restricted/Visible Damage - Refer to: Symptoms - Engine Exhaust
    • Intake Air Duct - Cracked/Loose Clamps/Restricted/Visible Damage
    • Intake Manifold - Cracked/Loose Clamps/Restricted/Vacuum leak/Visible Damage
    • Positive Crankcase Ventilation System
      • Leaking @ O-Ring - Missing/Visible Damage
      • Restricted - Moisture/Ice
      • Incorrect connection/Leaking/Restricted
    • Vacuum Hoses - Kinked/Leaking/Incorrect connection/Restricted
    • Vacuum leak @ Engine - Oil Level Indicator and Tube/Oil Filler Cap
    • If a condition exists 

      Repair or replace the components as necessary.

    • Go to next step: If no condition exists 
  9. Engine - Idling - At normal operating temperature
  10. Verify the scan tool parameter:
    • MAP Sensor = 26 to 52 kPa (3.8 to 7.5 PSI) @Idle Speed
    • MAP Sensor = The value should change with accelerator pedal input.
    • If not between 26 and 52 kPa (3.8 and 7.5 PSI) or does not change 

      Refer to: DTC P0107 or P0108 

    • Go to next step: If between 26 and 52 kPa (3.8 and 7.5 PSI) and changes 
  11. Increase the engine speed slowly to 3k RPM and then back to idle.
  12. Perform the scan tool function: Review Stored Data
  13. Observe the scan tool parameter frame by frame with a scan tool: MAF Sensor

    Verify the scan tool parameter: MAF Sensor = The value should not spike or drop out.

    • Go to next step: If the value does not spike or drop out 
  14. Verify the following conditions do not exist: Engine - Mechanical Condition
      NOTE:

      The list is not all encompassing - Refer to: Symptoms - Engine Mechanical

    • Camshaft Lobe(s) - Visible Damage/Worn
    • Exhaust ValveorIntake Valve - Stuck Open/Visible Damage
    • Exhaust Valve SeatorIntake Valve Seat - Visible Damage
    • Piston - Cracked/Visible Damage
    • Piston Ring - Seized/Visible Damage/Worn
    • If a condition exists 

      Repair or replace as necessary

    • Go to next step: If no condition exists 
  15. 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.

    Verify the DTC does not set.

    • If the DTC sets 

      Repeat the procedure starting at step 1

    • Go to next step: If the DTC is not set 
  16. All OK.
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