Speed Control

U0002-CAN C BUS OFF PERFORMANCE





For a complete wiring diagram Refer to Diagrams/Electrical.

- When Monitored:

Continuously monitored with the engine running and the ACC Module in normal mode.

- Set Condition:

The ACC Module can not transmit messages properly over the CAN C bus. 600 millisecond. The ACC module will disable the Adaptive Cruise Control (ACC) system and the ACC UNAVAILABLE message will display in the CCN. Once the DTC goes to stored, the ACC system will return to normal operation. The DTC will be cleared after the ACC Module sees 100 consecutive key cycles of the STORED DTC.





Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.

Refer to Communications for diagnostic procedures and for further possible causes.

Diagnostic Test

1.ACTIVE COMMUNICATION DTC(S) IN FCM

NOTE: To help in the service of the Adaptive Cruise Control (ACC) System, it is recommend speaking to the customer to find out what type of environment they were driving in when the cruise concern took place. Heavy rain, snow, ice and fog can cause the ACC system to become unavailable. This should be normal operation and no repair is necessary.

Turn the ignition on.

With the scan tool, read DTCs in the FCM DTC's.

Does the scan tool display as active?

Yes

- Refer to Communications for the diagnostic procedure U0001-CAN C BUS. U0001

No

- Go To 2

2.ACTIVE DTC

Ignition on, engine not running.

With a scan tool, read ACC DTCs.

Is the DTC active at this time?

Yes

- Go To 3

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, pay particulate attention the both CAN circuits.
- Perform the ACC MODULE VERIFICATION TEST. Adaptive Cruise Control (ACC) Verification Test

3.(F202) FUSED IGNITION CIRCUIT





Turn the ignition off.

Disconnect the ACC Module harness connector.

Start the engine.

Using a test light connected to ground, probe the (F202) Fused Ignition circuit.

NOTE: The test light should be illuminated and bright. Compare the brightness to that of a direct connection to the battery.

Does the test light illuminate brightly?

Yes

- Go To 4

No

- Repair the (F202) Fused Ignition circuit.
- Perform the ACC MODULE VERIFICATION TEST. Adaptive Cruise Control (ACC) Verification Test

4.(Z901) GROUND CIRCUIT





Turn the ignition off.

Using a test light connected to battery voltage, probe the (Z901) Ground circuit

NOTE: The test light should be illuminated and bright. Compare the brightness to that of a direct connection to the battery.

Does the test light illuminate brightly?

Yes

- Go To 5

No

- Repair the (Z901) Ground circuit.
- Perform the ACC MODULE VERIFICATION TEST. Adaptive Cruise Control (ACC) Verification Test

5.(D65) CAN C BUS (+) CIRCUIT SHORTED TO VOLTAGE





Turn the ignition off.

Disconnect the ACC Module harness connector.

Turn the ignition on.

Measure the voltage between the (D65) CAN C Bus (+) circuit and ground.

NOTE: The test light test should be performed while cranking the engine over, this will power up the ignition run/start circuits.

Does the test light illuminate brightly?

Yes

- Repair the (D65) CAN C Bus (+) circuit for a short to voltage.
- Perform the ACC MODULE VERIFICATION TEST. Adaptive Cruise Control (ACC) Verification Test

No

- Go To 6

6.(D64) CAN C BUS (-) CIRCUIT SHORTED TO VOLTAGE





NOTE: The test light test should be performed while cranking the engine over, this will power up the ignition run/start circuits.

Measure the voltage between the (D64) CAN C Bus (-) circuit and ground.

Does the test light illuminate brightly?

Yes

- Repair the (D64) CAN C Bus (-) circuit for a short to voltage.
- Perform the ACC MODULE VERIFICATION TEST. Adaptive Cruise Control (ACC) Verification Test

No

- Go To 7

7.(D65) CAN C BUS (+) CIRCUIT SHORTED TO GROUND

Turn the ignition off.

Measure the resistance between ground and the (D65) CAN C Bus (+) circuit.

Is any resistance present?

Yes

- Repair the (D65) CAN C Bus (+) circuit for a short to ground.
- Perform the ACC MODULE VERIFICATION TEST. Adaptive Cruise Control (ACC) Verification Test

No

- Go To 8

8.(D64) CAN C BUS (-) CIRCUIT SHORTED TO GROUND





Measure the resistance between ground and the (D64) CAN C Bus (-) circuit.

Is any resistance present?

Yes

- Repair the (D64) CAN C Bus (-) circuit for a short to ground.
- Perform the ACC MODULE VERIFICATION TEST. Adaptive Cruise Control (ACC) Verification Test

No

- Go To 9

9.(D65) CAN C BUS (+) CIRCUIT SHORTED TO (D64) CAN C BUS (-) CIRCUIT





Measure the resistance between the (D65) CAN C Bus (+) circuit and the (D64) CAN C Bus (-) circuit.

Is any resistance present?

Yes

- Repair the (D65) CAN C Bus (+) circuit for a short to the (D64) CAN C Bus (-) circuit.
- Perform the ACC MODULE VERIFICATION TEST. Adaptive Cruise Control (ACC) Verification Test

No

- Inspect the wiring and connectors for damage or shorted circuits. If ok, replace and program the ACC Module.
- Perform the ACC MODULE VERIFICATION TEST. Adaptive Cruise Control (ACC) Verification Test