Circuit/System Testing

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

NOTE:

It may take up to 2 min for all vehicle systems to power down before an accurate ground or low reference circuit continuity test can be performed.

Ignition/Vehicle & All vehicle systems - Off
Disconnect the electrical connector: B345R Exhaust Pressure Differential Sensor - Exhaust Gas Recirculation
Test for less than 10 ohms between the test points: Low Reference circuit terminal 3 & Ground
- If 10 ohms or greater
1. Disconnect the electrical connector: X1 @ K20 Engine Control Module
2. Test for less than 2 ohms between the test points: Low Reference circuit terminal 3 @ Component harness & Terminal 19 X1 @ Control module harness
  - If 2 ohms or greater - Repair the open/high resistance in the circuit.
  - If less than 2 ohms - Replace the component: K20 Engine Control Module
- Go to next step: If less than 10 ohms
Ignition - On / Vehicle - In Service Mode
Test for 4.8 to 5.2 V between the test points: 5 V Reference circuit terminal 1 & Low Reference circuit terminal 3
- If less than 4.8 V
1. Ignition/Vehicle - Off
2. Disconnect the electrical connector: X1 @ K20 Engine Control Module
3. Test for infinite resistance between the test points: 5 V Reference circuit terminal 1 @ Component harness & Ground
  - If less than infinite resistance - Repair the short to ground on the circuit.
  - Go to next step: If infinite resistance
4. Test for less than 2 ohms between the test points: 5 V Reference circuit terminal 1 @ Component harness & Terminal 48 X1 @ Control module harness
  - If 2 ohms or greater - Repair the open/high resistance in the circuit.
  - If less than 2 ohms - Replace the component: K20 Engine Control Module
- If greater than 5.2 V
1. Ignition/Vehicle - Off
2. Disconnect the electrical connector: X1 @ K20 Engine Control Module
3. Ignition - On / Vehicle - In Service Mode
4. Test for less than 1 V between the test points: 5 V Reference circuit terminal 1 @ Component 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
Verify the scan tool parameter: Exhaust Gas Recirculation Pressure Sensor = Less than 0.5 V
- If 0.5 V or greater
1. Ignition/Vehicle - Off
2. Disconnect the electrical connector: X1 @ K20 Engine Control Module
3. Test for less than 1 V between the test points: Signal circuit terminal 2 @ Component 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 less than 0.5 V
Connect a 3 A fused jumper wire between the test points: Signal circuit terminal 2 & 5 V Reference circuit terminal 1
Verify the scan tool parameter: Exhaust Gas Recirculation Pressure Sensor = Greater than 4.8 V
- If 4.8 V or less
1. Ignition/Vehicle - Off & Remove - Jumper wire(s)
2. Disconnect the electrical connector: X1 @ K20 Engine Control Module
3. Test for infinite resistance between the test points: Signal circuit terminal 2 @ Component harness & Ground
  - If less than infinite resistance - Repair the short to ground on the circuit.
  - Go to next step: If infinite resistance
4. Ignition/Vehicle - Off
5. Test for less than 2 ohms between the test points: Signal circuit terminal 2 @ Component harness & Terminal 84 X1 @ Control module harness
  - If 2 ohms or greater - Repair the open/high resistance in the circuit.
  - If less than 2 ohms - Replace the component: K20 Engine Control Module
- Go to next step: If greater than 4.8 V
Replace the component: B345R Exhaust Pressure Differential Sensor - Exhaust Gas Recirculation