Pinpoint Test U: DTC U0155:00

Electronic Locking Differential (ELD) System

Pinpoint Tests

Pinpoint Test U: DTC U0155:00

Normal Operation
- DTC U0155:00 (Lost Communication With Instrument Panel Cluster (IPC) Control Module: No Sub-Type Information) - sets in continuous memory in the Transfer Case Control Module (TCCM) if data messages received from the Instrument Panel Cluster (IPC) over the High Speed Controller Area Network (HS-CAN) are missing for 5 seconds or longer. For a complete list of all network messages, refer to Module Communications Network Testing and Inspection.

This pinpoint test is intended to diagnose the following:

- TCCM
- IPC

PINPOINT TEST U: DTC U0155:00

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U1 VERIFY THE CUSTOMER CONCERN

- Ignition ON.
- Verify there is an observable symptom present.
- Is an observable symptom present?

Yes
GO to U2.

No
The system is operating normally at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.

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U2 CHECK THE COMMUNICATION NETWORK

- Ignition ON.
- Enter the following diagnostic mode on the scan tool: Network Test.
- Carry out the network test.
- Does the IPC pass the network test?

Yes
GO to U3.

No
REFER to Module Communications Network Testing and Inspection.

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U3 RETRIEVE THE RECORDED DTCs FROM THE IPC SELF-TEST

- Check for recorded DTCs from the IPC self-test.
- Is DTC U3003:16 or DTC U3003:17 recorded?

Yes
REFER to Instrumentation, Message Center, and Warning Chimes Testing and Inspection.

No
GO to U4.

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U4 RETRIEVE THE RECORDED DTCs FROM THE TCCM SELF-TEST

- Check for recorded DTCs from the TCCM self-test.
- Is DTC P0562:00 or DTC P0563:00 recorded?

Yes
GO to Pinpoint Test G Pinpoint Test G: DTCs P0562:00 and P0563:00.

No
GO to U5.

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U5 RECHECK THE TCCM DTCs

- Clear the DTCs.
- Wait 10 seconds.
- Repeat the TCCM self-test.
- Is DTC U0155:00 still present?

Yes
GO to U6.

No
The system is operating correctly at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.

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U6 CHECK FOR DTC U0155:00 SET IN OTHER MODULES

- Clear all DTCs.
- Ignition OFF.
- Ignition ON.
- Wait 10 seconds.
- Enter the following diagnostic mode on the scan tool: Self-Test.
- Retrieve the continuous memory DTCs from all modules.
- Is DTC U0155:00 set in the Body Control Module (BCM), Restraints Control Module (RCM), or Driver Door Module (DDM)?

Yes
INSTALL a new IPC. REFER to Instrumentation, Message Center, and Warning Chimes Instrument Panel Cluster (IPC). TEST the system for normal operation.

No
INSTALL a new TCCM. REFER to Transfer Case Control Module (TCCM) Service and Repair. TEST the system for normal operation. REPEAT the self-test.

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