Circuit/System Testing

NOTE:

Circuit/System Verification must be performed before proceeding with Circuit/System Testing.

Ignition/Vehicle & All vehicle systems - Off
Disconnect the electrical connector: T19 Power Supply Transformer
Test for less than 10 ohms between the test points:
- Ground circuit terminal 7 @ T19 Power Supply Transformer & Ground
- Ground circuit terminal 12 @ T19 Power Supply Transformer & Ground
- If 10 ohms or greater
1. Disconnect the appropriate ground connection: The other end of the circuit
2. Test for less than 2 ohms between the test points: Each ground circuit terminal @ T19 Power Supply Transformer & The other end of the circuit
  - If 2 ohms or greater - Repair the open/high resistance in the circuit.
  - If less than 2 ohms - Repair the open/high resistance in the ground connection.
- Go to next step: If less than 10 ohms
Verify a test lamp turns On between the test points:
- B+ circuit terminal 8 @ T19 Power Supply Transformer & Ground
- B+ circuit terminal 11 @ T19 Power Supply Transformer & Ground
- If the test lamp does not turn On and the circuit fuse is OK
1. Ignition/Vehicle - Off & Remove - Test lamp
2. Test for less than 2 ohms between the test points:
  - B+ circuit terminal 8 @ T19 Power Supply Transformer & Output terminal @ Fuse
  - B+ circuit terminal 11 @ T19 Power Supply TransformerOutput terminal @ Fuse
  - If 2 ohms or greater - Repair the open/high resistance in the circuit.
  - If less than 2 ohms - Verify the fuse is OK and there is voltage at the fuse.
- If the test lamp does not turn On and the circuit fuse is open
1. Ignition/Vehicle - Off & Remove - Test lamp
2. Test for infinite resistance between the test points:
  - B+ circuit terminal 8 @ T19 Power Supply Transformer & Ground
  - B+ circuit terminal 11 @ T19 Power Supply Transformer & Ground
  - If less than infinite resistance - Repair the short to ground on the circuit.
  - If infinite resistance - Replace the component: T19 Power Supply Transformer
- Go to next step: If the test lamp turns On
Ignition - On / Vehicle - In Service Mode
Verify a test lamp turns On between the test points: Ignition circuit terminal 6 @ T19 Power Supply Transformer & Ground
- If the test lamp does not turn On and the circuit fuse is OK
1. Ignition/Vehicle - Off & Remove - Test lamp
2. Test for less than 2 ohms between the test points: Ignition circuit terminal 6 @ T19 Power Supply Transformer & KR73 Ignition Main Relay
  - If 2 ohms or greater - Repair the open/high resistance in the circuit.
  - If less than 2 ohms - Verify the fuse is OK and there is voltage at the fuse.
- If the test lamp does not turn On and the circuit fuse is open
1. Ignition/Vehicle - Off & Remove - Test lamp
2. Test for infinite resistance between the test points: Ignition circuit terminal 6 @ T19 Power Supply Transformer & Ground
  - If less than infinite resistance - Repair the short to ground on the circuit.
  - If infinite resistance - Replace the component: T19 Power Supply Transformer
- Go to next step: If the test lamp turns On
Ignition Off
Verify a test lamp does not turn On between the test points: Ignition circuit terminal 6 @ T19 Power Supply Transformer & Ground
- If the test lamp turns On
  Repair the short to voltage on the circuit.
- Go to next step: If the test lamp does not turn On
Ignition/Vehicle - Off & Remove - Test lamp
Connect all electrical connectors.
Clear DTCs
Operate the vehicle under the following conditions: Autostart/Autostop
Verify DTC P3052, P3054, P3056 is not set.
- If any of the DTCs are set
  Test or replace the component: T19 Power Supply Transformer
- Go to next step: If no DTC is set
All OK.