Pinpoint Tests AK: DTC U0100

Instrumentation and Warning Chimes

Pinpoint Test

Pinpoint Test AK: DTC U0100

Normal Operation
- DTC U0100 (Lost Communication With ECM/PCM) - sets in the IC if data messages received from the PCM over the High Speed Controller Area Network (HS-CAN) are missing for 5 seconds or longer.

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

This pinpoint test is intended to diagnose the following:

- PCM
- IC



PINPOINT TEST AK: DTC U0100

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AK1 VERIFY CUSTOMER CONCERN


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

Yes
GO to AK2.

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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AK2 CHECK THE COMMUNICATION NETWORK


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

Yes
GO to AK3.

No
REFER to Information Bus.

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AK3 RETRIEVE THE RECORDED DTCs FROM THE SELF-TEST


- Check for recorded IC DTCs from the self-test.
- Is DTC B1317 or DTC B1318 recorded?

Yes
GO to Pinpoint Test AH (DTC B1317) or GO to Pinpoint Test AI (DTC B1318). Pinpoint Tests AH: DTC B1317 Pinpoint Tests AI: DTC B1318

No
GO to AK4.

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AK4 RECHECK THE IC DTCs


NOTE: If new modules were installed prior to the DTC being set, the module configuration may be incorrectly set during Programmable Module Installation (PMI) or the PMI may not have been carried out.

- Clear the DTCs. Repeat the IC self-test.
- Is DTC U0100 still present?

Yes
INSTALL a new PCM. REFER to Computers and Control Systems. TEST the system for normal operation. REPEAT the IC self-test.

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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