Pinpoint Tests AQ: DTC U0100:00

Instrumentation, Message Center and Warning Chimes

Pinpoint Test AQ: DTC U0100:00

Normal Operation
- DTC U0100:00 (Lost Communication With ECM/PCM "A": No Sub-Type Information) - sets in the Instrument Panel Cluster (IPC) if data messages received from the PCM over the High Speed Controller Area Network (HS-CAN) are missing for greater than 5 seconds. For a complete list of all network messages, refer to Information Bus.

NOTE: Once the IPC sets DTC U0100:00, multiple gauges or indicators are likely to be inoperative in the IPC. Other modules that require data from the IPC all set communication DTCs and may also exhibit system function concerns.

This pinpoint test is intended to diagnose the following:

- PCM
- IPC



PINPOINT TEST AQ: DTC U0100:00

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AQ1 VERIFY THAT THE SCAN TOOL CAN COMMUNICATE WITH THE PCM


- Connect the scan tool.
- Check that a vehicle session can be established using the scan tool.
- Can a vehicle session be established?

Yes
GO to AQ2.

No
REFER to Information Bus to diagnose no communication with the PCM.

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AQ2 CHECK THE IPC CONTINUOUS MEMORY DTCs


- Ignition ON.
- Enter the following diagnostic mode on the scan tool: IPC Self-Test.
- Clear the DTCs. Repeat the IPC self-test.
- Is DTC U0100:00 retrieved again?

Yes
GO to AQ3.

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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AQ3 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
GO to Pinpoint Test BE (U3003:16) or GO to Pinpoint Test BF (U3003:17). Pinpoint Tests BE: DTC U3003:16 Pinpoint Tests BF: DTC U3003:17

No
GO to AQ4.

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AQ4 CHECK FOR DTC U0100:00 SET IN OTHER MODULES


- Ignition ON.
- Enter the following diagnostic mode on the scan tool: Self-Test.
- Retrieve the continuous memory DTCs from all modules.
- Is DTC U0100:87 set in the Remote Function Actuator (RFA) module (if equipped) or DTC U0100 in the Restraints Control Module (RCM)?

Yes
INSTALL a new PCM. REFER to Computers and Control Systems. CLEAR the DTCs. REPEAT the self-test.

No
INSTALL a new IPC. REFER to Instrument Panel Cluster (IPC) Instrument Panel Cluster (IPC). TEST the system for normal operation.

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