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Home >> GMC >> 2020 >> Terrain Denali, FWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 7 (Engine Controls And Fuel - 1.5L (LYX) - Diagnostic Information And Procedures (2 Of 2)) >> Diagnostic Information and Procedures >> DTC P0641, P0651, P0697, P06A3, or P06D2 (With NTM) >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
  1. Ignition/Vehicle - Off
    2. NOTE:

    Additional DTCs will set when disconnecting the components.

  2. Disconnect the electrical connector at one of the following components, depending on the DTC that is set:

    P0641

    • B1 A/C Refrigerant Pressure Sensor
    • B23E Camshaft Position Sensor - Exhaust
    • B23F Camshaft Position Sensor - Intake
    • B47 Fuel Pressure Sensor
    • B65 Intake Manifold Pressure and Air Temperature Sensor
    • S126 Drive Mode Select Switch

    P0651

    • B19B Brake Booster Vacuum Sensor
    • B22 Brake Pedal Position Sensor
    • B26 Crankshaft Position Sensor
    • B37B Engine Oil Pressure Sensor
    • B111 Turbocharger Boost Sensor

    P0697

    • B107 Accelerator Pedal Position Sensor2

    P06A3

    • Q38 Throttle Body
    • B107 Accelerator Pedal Position Sensor1

    P06D2

    • B75C Multifunction Intake Air Sensor
    • B150 Fuel Tank Pressure Sensor
    • B310 Fuel Pressure/Temperature Sensor
  3. Ignition - On / Vehicle - In Service Mode
  4. Verify the scan tool parameter:5V Reference 1 - 5 Circuit Status=Malfunction - For the circuit that set the DTC.
    • If not the specified state after disconnecting a component from the circuit 

      Test or replace the component:The component that was disconnected last.

    • If the specified state and there are components connected to the circuit 

      Disconnect a component and repeat step 4.

    • Go to next step: If the specified state with all components disconnected from the circuit 
  5. Test for 4.8 to 5.2 V between the test points:

    P0641 - 5V Reference 1 Circuit

    • 5 V Reference circuit terminal 2@B1 A/C Refrigerant Pressure Sensor & Ground
    • 5 V Reference circuit terminal 1@B23E Camshaft Position Sensor - Exhaust & Ground
    • 5 V Reference circuit terminal 1@B23F Camshaft Position Sensor - Intake & Ground
    • 5 V Reference circuit terminal 3@B47 Fuel Pressure Sensor & Ground
    • 5 V Reference circuit terminal 2@B65 Intake Manifold Pressure and Air Temperature Sensor & Ground
    • { -EPH }5 V Reference circuit terminal 3@S126 Drive Mode Select Switch & Ground
    • { EPH }5 V Reference circuit terminal 9@S126 Drive Mode Select Switch & Ground

    P0651 - 5V Reference 2 Circuit

    • 5 V Reference circuit terminal 3@B19B Brake Booster Vacuum Sensor & Ground
    • 5 V Reference circuit terminal 5@B22 Brake Pedal Position Sensor & Ground
    • 5 V Reference circuit terminal 1@B26 Crankshaft Position Sensor & Ground
    • 5 V Reference circuit terminal 3@B37B Engine Oil Pressure Sensor & Ground
    • 5 V Reference circuit terminal 1@B111 Turbocharger Boost Sensor & Ground

    P0697 - 5V Reference 3 Circuit

    • 5 V Reference circuit terminal 1@B107 Accelerator Pedal Position Sensor - Sensor 2 & Ground

    P06A3 - 5V Reference 4 Circuit

    • 5 V Reference circuit terminal 2@B107 Accelerator Pedal Position Sensor - Sensor 1 & Ground
    • 5 V Reference circuit terminal 5@Q38 Throttle Body & Ground

    P06D2 - 5V Reference 5 Circuit

    • 5 V Reference circuit terminal 2@B75C Multifunction Intake Air Sensor & Ground
    • 5 V Reference circuit terminal 3@B150 Fuel Tank Pressure Sensor & Ground
    • 5 V Reference circuit terminal 3@B310 Fuel Pressure/Temperature Sensor & Ground
    • If less than 4.8 V 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector:K20 Engine Control Module
    3. Test for infinite resistance between the test points:

      P0641

      • 5 V Reference circuit terminal 4 X2 @Control module harness & Ground
      • 5 V Reference circuit terminal 5 X2 @Control module harness & Ground
      • 5 V Reference circuit terminal 6 X2 @Control module harness & Ground
      • 5 V Reference circuit terminal 7 X2 @Control module harness & Ground
      • 5 V Reference circuit terminal 37 X1 @Control module harness & Ground
      • 5 V Reference circuit terminal 38 X1 @Control module harness & Ground

      P0651

      • 5 V Reference circuit terminal 14 X2 @Control module harness & Ground
      • 5 V Reference circuit terminal 14 X3 @Control module harness & Ground
      • 5 V Reference circuit terminal 15 X2 @Control module harness & Ground
      • 5 V Reference circuit terminal 15 X3 @Control module harness & Ground
      • 5 V Reference circuit terminal 41 X1 @Control module harness & Ground

      P0697

      • 5 V Reference circuit terminal 11 X1 @Control module harness & Ground

      P06A3

      • 5 V Reference circuit terminal 12 X1 @Control module harness & Ground
      • 5 V Reference circuit terminal 12 X2 @Control module harness & Ground

      P06D2

      • 5 V Reference circuit terminal 6 X3 @Control module harness & Ground
      • 5 V Reference circuit terminal 8 X3 @Control module harness & Ground
      • 5 V Reference circuit terminal 18 X1 @Control module harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance - Replace the component:K20 Engine Control Module
    • If greater than 5.2 V 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector:K20 Engine Control Module
    3. Ignition - On / Vehicle - In Service Mode
    4. Test for less than 1 V between the test points:

      P0641

      • 5 V Reference circuit terminal 4 X2 @Control module harness & Ground
      • 5 V Reference circuit terminal 5 X2 @Control module harness & Ground
      • 5 V Reference circuit terminal 6 X2 @Control module harness & Ground
      • 5 V Reference circuit terminal 7 X2 @Control module harness & Ground
      • 5 V Reference circuit terminal 37 X1 @Control module harness & Ground
      • 5 V Reference circuit terminal 38 X1 @Control module harness & Ground

      P0651

      • 5 V Reference circuit terminal 14 X2 @Control module harness & Ground
      • 5 V Reference circuit terminal 14 X3 @Control module harness & Ground
      • 5 V Reference circuit terminal 15 X2 @Control module harness & Ground
      • 5 V Reference circuit terminal 15 X3 @Control module harness & Ground
      • 5 V Reference circuit terminal 41 X1 @Control module harness & Ground

      P0697

      • 5 V Reference circuit terminal 11 X1 @Control module harness & Ground

      P06A3

      • 5 V Reference circuit terminal 12 X1 @Control module harness & Ground
      • 5 V Reference circuit terminal 12 X2 @Control module harness & Ground

      P06D2

      • 5 V Reference circuit terminal 6 X3 @Control module harness & Ground
      • 5 V Reference circuit terminal 8 X3 @Control module harness & Ground
      • 5 V Reference circuit terminal 18 X1 @Control module harness & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • If less than 1 V - Replace the component:K20 Engine Control Module
    • Go to next step: If between 4.8 and 5.2 V 
  6. All OK.
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