Pinpoint Tests AM: DTC U0100:00 and P1607:87

Instrumentation, Message Center and Warning Chimes

Pinpoint Test AM: DTC U0100:00 and P1607:87

Normal Operation

- DTC U0100:00 (Lost Communication With ECM/PCM "A": No Sub Type Information) - sets in continuous memory 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 5 seconds or more. For a complete list of all network messages, refer to Module Communications Network Testing and Inspection.
- DTC P1607:87 ( MIL Output Circuit: Missing Message) - sets in continuous memory in the IPC when the MIL message from the PCM is missing for 5 seconds or more.

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 AM: DTC U0100:00 AND P1607:87

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AM1 VERIFY 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 AM2.

No
REFER to Module Communications Network Testing and Inspection to diagnose no communication with the PCM.

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AM2 CHECK THE IPC CONTINUOUS MEMORY DTCs

- Ignition ON.
- Enter the following diagnostic mode on the scan tool: IPC Self-Test.
- Clear the DTCs.
- Wait 10 seconds.
- Repeat the IPC self-test.
- Is DTC U0100:00 or DTC P1607:87 retrieved again?

Yes
GO to AM3.

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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AM3 RETRIEVE THE RECORDED DTCs FROM THE PCM KOEO SELF-TEST

- Check for recorded DTCs from the PCM Key ON Engine OFF (KOEO) self-test.
- Is DTC P0562 or P0563 recorded?

Yes
REFER to Electronic Engine Controls P Codes for Electronic Engine Controls.

No
GO to AM4.

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AM4 RETRIEVE THE RECORDED DTCs FROM THE IPC SELF-TEST

- Check for recorded DTCs from the IPC self-test.
- Is DTC U3006:16 or DTC U3006:17 recorded?

Yes
For DTC U3006:16, GO to Pinpoint Test AU. For DTC U3006:17, GO to Pinpoint Test AV. Pinpoint Tests AU: DTC U3006:16 Pinpoint Tests AV: DTC U3006:17

No
GO to AM5.

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AM5 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 U0100:00 set in the Remote Function Actuator (RFA) module or the Restraints Control Module (RCM)?

Yes
INSTALL a new PCM. REFER to Electronic Engine Controls Service and Repair. CLEAR the DTCs. REPEAT the self-test.

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

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