Circuit/System Testing

WARNING: This page is about a different car, the 2019 Chevrolet Malibu. However, it is still accessible from the selected car via links, so may be relevant.

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: B1C A/C Low Side Pressure Sensor
Test for less than 10 ohms between the test points: Low Reference circuit terminal 1 & Ground
- If 10 ohms or greater
1. Disconnect the electrical connector: K114B Hybrid/EV Powertrain Control Module 2
2. Test for less than 2 ohms between the test points: Low Reference circuit terminal 1 @ Component harness & Terminal 12 @ Control module harness
  - If 2 ohms or greater - Repair the open/high resistance in the circuit.
  - If less than 2 ohms - Replace the component:K114B Hybrid/EV Powertrain Control Module 2
- 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 2 & Low Reference circuit terminal 1
- If less than 4.8 V
1. Ignition/Vehicle - Off
2. Disconnect the electrical connector:K114B Hybrid/EV Powertrain Control Module 2
3. Test for infinite resistance between the test points: 5 V Reference 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. Test for less than 2 ohms between the test points: 5 V Reference circuit terminal 2 @ Component harness & Terminal 3 @ Control module harness
  - If 2 ohms or greater - Repair the open/high resistance in the circuit.
  - If less than 2 ohms - Replace the component:K114B Hybrid/EV Powertrain Control Module 2
- If greater than 5.2 V
1. Ignition/Vehicle - Off
2. Disconnect the electrical connector:K114B Hybrid/EV Powertrain Control Module 2
3. Ignition - On / Vehicle - In Service Mode
4. Test for less than 1 V between the test points:5 V Reference 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:K114B Hybrid/EV Powertrain Control Module 2
- Go to next step: If between 4.8 and 5.2 V
Verify the scan tool parameter:A/C Low Side Pressure Sensor = Less than 0.1 V
- If 0.1 V or greater
1. Ignition/Vehicle - Off
2. Disconnect the electrical connector:K114B Hybrid/EV Powertrain Control Module 2
3. Ignition - On / Vehicle - In Service Mode
4. Test for less than 1 V between the test points:Signal circuit terminal 3 @ Component harness & Ground
  - If 1 V or greater - Repair the short to voltage on the circuit.
  - If less than 1 V - Replace the component:K114B Hybrid/EV Powertrain Control Module 2
- Go to next step: If less than 0.1 V
Connect a 3 A fused jumper wire between the test points:Signal circuit terminal 3 & 5 V Reference circuit terminal 2
Verify the scan tool parameter:A/C Low Side Pressure Sensor = Greater than 4.8 V
- If less than 4.8 V
1. Ignition/Vehicle - Off & Remove - Jumper wire(s)
2. Disconnect the electrical connector:K114B Hybrid/EV Powertrain Control Module 2
3. Test for infinite resistance between the test points:Signal circuit terminal 3 @ 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:Signal circuit terminal 3 @ Component harness & Terminal 2 @ Control module harness
  - If 2 ohms or greater - Repair the open/high resistance in the circuit.
  - If less than 2 ohms - Replace the component:K114B Hybrid/EV Powertrain Control Module 2
- Go to next step: If 4.8V V or greater
Test or replace the component:B1C A/C Low Side Pressure Sensor