Pinpoint Tests AO: The Engine Or Motor Over-Temperature Message Center Warning Indicator Is Never/Always On

Instrumentation, Message Center and Warning Chimes

Pinpoint Test AO: The Engine Or Motor Over-Temperature Message Center Warning Indicator Is Never/Always On (Hybrid)

Normal Operation

The Instrument Panel Cluster (IPC) receives the engine and motor over-temperature status from the PCM over the High Speed Controller Area Network (HS-CAN) communication bus. If the PCM detects an engine or motor over-temperature condition, the PCM sends a command to the IPC to turn the engine or motor over-temperature message center warning indicator on. If the PCM determines that the engine is sufficiently overheated to enter into the fail-safe cooling mode, the PCM sends a command to the IPC to flash the engine or motor over-temperature message center warning indicator.

If the engine or motor over-temperature message is missing or invalid for less than 5 seconds, the engine or motor over-temperature message center warning indicator remains in the last state (on or off) based upon the last known good message received. If the engine over-temperature message is invalid for more than 5 seconds, the IPC sets DTC U0401:68 in continuous memory and defaults the engine or motor over-temperature message center warning indicator on. If the motor over-temperature message is invalid for more than 5 seconds, the IPC sets DTC U0401:68 in continuous memory and defaults the engine or motor over-temperature message center indicator off. If the engine over-temperature message is missing for more than 5 seconds, the IPC sets DTC U0100:00 in continuous memory and defaults the engine or motor over-temperature message center warning indicator on.

NOTE: If DTC U0100:00 is set in the IPC, other observable symptoms may be an inoperative speedometer, tachometer or odometer.

This pinpoint test is intended to diagnose the following:

- PCM
- IPC


PINPOINT TEST AO: THE ENGINE OR MOTOR OVER-TEMPERATURE MESSAGE CENTER WARNING INDICATOR IS NEVER/ALWAYS ON (HYBRID)

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AO1 CHECK THE MESSAGE CENTER OPERATION

- Close all doors and the luggage compartment lid.
- Ignition ON.
- Open the driver door while monitoring the message center displays.
- Does the message center display the door ajar message center warning indicator along with the DRIVER DOOR AJAR text?

Yes
GO to AO2.

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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AO2 RETRIEVE THE RECORDED DTCs FROM THE PCM KOEO SELF-TEST

- Check for recorded PCM DTCs from the Key ON Engine OFF (KOEO) self-test.
- Are any PCM DTCs recorded?

Yes
REFER to Computers and Control Systems Information.

No
GO to AO3.

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AO3 RETRIEVE THE RECORDED DTCs FROM THE IPC SELF-TEST

- Check for recorded DTCs from the IPC self-test.
- Are any DTCs recorded?

Yes
For DTC U0100:00, GO to Pinpoint Test BF. Pinpoint Tests BF: DTC U0100:00

For DTC U0401:68, RETRIEVE and REPAIR all non-network DTCs in the PCM and other modules on the network. REFER to Computers and Control Systems Information and Multifunction Electronic Modules Testing and Inspection for a list of all DTCs.

For all other DTCs, REFER to DTC Charts. Instrumentation, Message Center and Warning Chimes

No
INSTALL a new PCM. REFER to Electronic Engine Controls - Hybrid Service and Repair. TEST the system for normal operation.

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