U0026

U0026-CAN B BUS (-) CIRCUIT HIGH






For a complete wiring diagram refer to Diagrams/Electrical.

- When Monitored:

Continuously.

- Set Condition:

The TIPM detects the (D54) CAN B Bus (-) circuit is shorted to voltage.






Diagnostic Test

1. TEST FOR INTERMITTENT CONDITION

Turn the ignition on.

With the scan tool, record and erase TIPM DTC's.

Cycle the ignition from on to off 3 times.

Turn the ignition on.

With the scan tool, read active TIPM DTC's.

Does the scan tool display this DTC as active?

Yes

- Go To 2

No

- The conditions that caused this code to set are not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.

2. CHECK THE (D54) CAN B BUS (-) CIRCUIT FOR A SHORT TO VOLTAGE





Turn the ignition off.

Disconnect the Totally Integrated Power Module C6 harness connector.

Turn the ignition on.

Measure the voltage between the (D54) CAN B Bus (-) circuit and ground.

Is voltage above 10.0 volts?

Yes

- Go To 3

No

- Inspect the wiring and connectors for damage or shorted circuits. If OK, replace the Totally Integrated Power Module.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

3. (D54) CAN B BUS (-) CIRCUIT SHORTED TO VOLTAGE





Measure the voltage between the (D54) CAN B Bus (-) circuit and ground.

While monitoring the voltmeter, disconnect each CAN B Bus module one at a time.

NOTE: When performing the above step, turn the ignition off (wait one minute) before disconnecting any module. When the module is disconnected turn the ignition on to check for a short to voltage.

NOTE: This is to determine if the short to voltage is internal within a module or if the circuit is shorted.

NOTE: Disconnecting an in-line connector can eliminate a module or group of modules from the list of possible causes for this fault. Refer to the wiring diagrams to assist in diagnosis.

Is the voltage above 10.0 volts with all the CAN B Bus modules disconnected?

Yes

- Repair the (D54) CAN B Bus (-) circuit for a short to voltage.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

No

- Replace the module that when disconnected the short to voltage was eliminated.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test