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
- B47B Fuel Rail Pressure Sensor
- B75C Multifunction Intake Air Sensor
- B150 Fuel Tank Pressure Sensor
P0651
- {MM6/MH3} B14A Transmission Output Shaft Speed Sensor
- {M5U/MGL} B22 Brake Pedal Position Sensor
- {MM6/MH3} B25B Clutch Pedal Position Sensor
- B26 Crankshaft Position Sensor
- {MM6/MH3} B227 Gear Position Sensor
- {MGL} B303 Transmission Range Sensor
- S126 Drive Mode Select Switch
P0697
- B74 Manifold Absolute Pressure Sensor
- B107 Accelerator Pedal Position Sensor - Sensor 2
P06A3
- B107 Accelerator Pedal Position Sensor - Sensor 1
- Q38 Throttle Body
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 3@B47 Fuel Pressure Sensor & Ground
- 5 V Reference circuit terminal 2@B75C Multifunction Intake Air Sensor & Ground
- 5 V Reference circuit terminal 3@B150 Fuel Tank Pressure Sensor & Ground
P0651 - 5V Reference 2 Circuit
- {MM6/MH3} 5 V Reference circuit terminal A@B14A Transmission Output Shaft Speed Sensor & Ground
- {M5U/MGL} 5 V Reference circuit terminal 5@B22 Brake Pedal Position Sensor & Ground
- {MM6/MH3} 5 V Reference circuit terminal C@B25B Clutch Pedal Position Sensor & Ground
- 5 V Reference circuit terminal 3@B26 Crankshaft Position Sensor & Ground
- {MM6/MH3} 5 V Reference circuit terminal 1@B227 Gear Position Sensor & Ground
- {MGL} 5 V Reference circuit terminal 4@B303 Transmission Range Sensor & Ground
- 5 V Reference circuit terminal 1@S126 Drive Mode Select Switch & Ground
P0697 - 5V Reference 3 Circuit
- 5 V Reference circuit terminal 1@B74 Manifold Absolute Pressure Sensor & Ground
- 5 V Reference circuit terminal 1@B107 Accelerator Pedal Position Sensor - Sensor 2 & Ground
P06A3 - 5V Reference 4 Circuit
- 5 V Reference circuit terminal 6@B107 Accelerator Pedal Position Sensor - Sensor 1 & Ground
- 5 V Reference circuit terminal 5@Q38 Throttle Body & Ground
- If less than 4.8 V
1. Ignition/Vehicle - Off
2. Disconnect the appropriate electrical connector: K20 Engine Control Module
3. Test for infinite resistance between the test points:
  P0641
  - 5 V Reference circuit terminal 2 X3 @Control module harness & Ground
  - 5 V Reference circuit terminal 5 X1 @Control module harness & Ground
  - 5 V Reference circuit terminal 10 X1 @Control module harness & Ground
  - 5 V Reference circuit terminal 18 X2 @Control module harness & Ground
  - 5 V Reference circuit terminal 21 X1 @Control module harness & Ground
  - 5 V Reference circuit terminal 34 X3 @Control module harness & Ground
  P0651
  - {MM6/MH3} 5 V Reference circuit terminal 5 X2 @Control module harness & Ground
  - 5 V Reference circuit terminal 10 X3 @Control module harness & Ground
  - 5 V Reference circuit terminal 14 X2 @Control module harness & Ground
  - 5 V Reference circuit terminal 18 X3 @Control module harness & Ground
  - 5 V Reference circuit terminal 47 X1 @Control module harness & Ground
  P0697
  - 5 V Reference circuit terminal 33 X1 @Control module harness & Ground
  - 5 V Reference circuit terminal 44 X2 @Control module harness & Ground
  P06A3
  - 5 V Reference circuit terminal 14 X1 @Control module harness & Ground
  - 5 V Reference circuit terminal 34 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 appropriate 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 2 X3 @Control module harness & Ground
  - 5 V Reference circuit terminal 5 X1 @Control module harness & Ground
  - 5 V Reference circuit terminal 10 X1 @Control module harness & Ground
  - 5 V Reference circuit terminal 18 X2 @Control module harness & Ground
  - 5 V Reference circuit terminal 21 X1 @Control module harness & Ground
  - 5 V Reference circuit terminal 34 X3 @Control module harness & Ground
  P0651
  - {MM6/MH3} 5 V Reference circuit terminal 5 X2 @Control module harness & Ground
  - 5 V Reference circuit terminal 10 X3 @Control module harness & Ground
  - 5 V Reference circuit terminal 14 X2 @Control module harness & Ground
  - 5 V Reference circuit terminal 18 X3 @Control module harness & Ground
  - 5 V Reference circuit terminal 47 X1 @Control module harness & Ground
  P0697
  - 5 V Reference circuit terminal 33 X1 @Control module harness & Ground
  - 5 V Reference circuit terminal 44 X2 @Control module harness & Ground
  P06A3
  - 5 V Reference circuit terminal 14 X1 @Control module harness & Ground
  - 5 V Reference circuit terminal 34 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.