Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.

Ignition/Vehicle - Off

NOTE:

Additional DTCs will set when disconnecting the components.

Disconnect the electrical connector at one of the following components, depending on the DTC that is set :
P0641
- B1 A/C Refrigerant Pressure Sensor
- B23 Camshaft Position Sensor
- B37B Engine Oil Pressure Sensor
- B75C Multifunction Intake Air Sensor
- B154 Diesel Particulate Filter Exhaust Differential Pressure Sensor
- Q14 Exhaust Gas Recirculation Valve
P0651
- B22 Brake Pedal Position Sensor
- B26 Crankshaft Position Sensor
- B65 Intake Manifold Pressure and Air Temperature Sensor
- M103 Turbocharger Vane Position Actuator
- Q20 Intake Air Flow Valve
- Q85 Cooling Fan Clutch
- R10 Cooling Fan Resistor
P0697
- B107 Accelerator Pedal Position Sensor - Sensor 2
P06A3
- B47B Fuel Rail Pressure Sensor
- B107 Accelerator Pedal Position Sensor - Sensor 1
Ignition - On / Vehicle - In Service Mode
Verify the scan tool parameter : 5V Reference 1 - 4 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
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 @ B23 Camshaft Position Sensor & Ground
- 5 V Reference circuit terminal 3 @ B37B Engine Oil Pressure Sensor & Ground
- 5 V Reference circuit terminal 2 @ B75C Multifunction Intake Air Sensor & Ground
- 5 V Reference circuit terminal 3 @ B154 Diesel Particulate Filter Exhaust Differential Pressure Sensor & Ground
- 5 V Reference circuit terminal 6 @ Q14 Exhaust Gas Recirculation Valve & Ground
P0651 - 5V Reference 2 Circuit
- 5 V Reference circuit terminal 6 @ B22 Brake Pedal Position Sensor & Ground
- 5 V Reference circuit terminal 1 @ B26 Crankshaft Position Sensor & Ground
- 5 V Reference circuit terminal 3 @ B65 Intake Manifold Pressure and Air Temperature Sensor & Ground
- 5 V Reference circuit terminal 5 @ M103 Turbocharger Vane Position Actuator & Ground
- 5 V Reference circuit terminal 5 @ Q20 Intake Air Flow Valve & Ground
- 5 V Reference circuit terminal E @ Q85 Cooling Fan Clutch & Ground
- 5 V Reference circuit terminal A @ R10 Cooling Fan Resistor & 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 1 @ B47B Fuel Rail Pressure Sensor & Ground
- 5 V Reference circuit terminal 2 @ B107 Accelerator Pedal Position Sensor - Sensor 1 & 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 7 X3 @ Control module harness & Ground
  - 5 V Reference circuit terminal 19 X2 @ Control module harness & Ground
  - 5 V Reference circuit terminal 40 X2 @ Control module harness & Ground
  - 5 V Reference circuit terminal 46 X1 @ Control module harness & Ground
  - 5 V Reference circuit terminal 50 X3 @ Control module harness & Ground
  - 5 V Reference circuit terminal 59 X2 @ Control module harness & Ground
  P0651
  - 5 V Reference circuit terminal 21 X3 @ Control module harness & Ground
  - 5 V Reference circuit terminal 43 X2 @ Control module harness & Ground
  - 5 V Reference circuit terminal 44 X1 @ Control module harness & Ground
  - 5 V Reference circuit terminal 62 X2 @ Control module harness & Ground
  - 5 V Reference circuit terminal 82 X2 @ Control module harness & Ground
  - 5 V Reference circuit terminal 83 X2 @ Control module harness & Ground
  P0697
  - 5 V Reference circuit terminal 14 X1 @ Control module harness & Ground
  P06A3
  - 5 V Reference circuit terminal 13 X1 @ Control module harness & Ground
  - 5 V Reference circuit terminal 89 X2 @ 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 7 X3 @ Control module harness & Ground
  - 5 V Reference circuit terminal 19 X2 @ Control module harness & Ground
  - 5 V Reference circuit terminal 40 X2 @ Control module harness & Ground
  - 5 V Reference circuit terminal 46 X1 @ Control module harness & Ground
  - 5 V Reference circuit terminal 50 X3 @ Control module harness & Ground
  - 5 V Reference circuit terminal 59 X2 @ Control module harness & Ground
  P0651
  - 5 V Reference circuit terminal 21 X3 @ Control module harness & Ground
  - 5 V Reference circuit terminal 43 X2 @ Control module harness & Ground
  - 5 V Reference circuit terminal 44 X1 @ Control module harness & Ground
  - 5 V Reference circuit terminal 62 X2 @ Control module harness & Ground
  - 5 V Reference circuit terminal 82 X2 @ Control module harness & Ground
  - 5 V Reference circuit terminal 83 X2 @ Control module harness & Ground
  P0697
  - 5 V Reference circuit terminal 14 X1 @ Control module harness & Ground
  P06A3
  - 5 V Reference circuit terminal 13 X1 @ Control module harness & Ground
  - 5 V Reference circuit terminal 89 X2 @ 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
All OK.