Pinpoint Test 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 (Instrument Panel Cluster) 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 (Instrument Panel Cluster) 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 (Instrument Panel Cluster) 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 (Instrument Panel Cluster) 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 (Instrument Panel Cluster) 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 (Instrument Panel Cluster) , other observable symptoms may be an inoperative speedometer, tachometer or odometer.

This pinpoint test is intended to diagnose the following:

- PCM

- IPC (Instrument Panel Cluster)

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

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 (Instrument Panel Cluster). REFER to Instrument Panel Cluster (IPC) . TEST the system for normal operation.

AO2 RETRIEVE THE RECORDED DTCs FROM THE PCM KOEO (Key ON Engine OFF) 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.

AO3 RETRIEVE THE RECORDED DTCs FROM THE IPC (Instrument Panel Cluster) SELF-TEST

- Check for recorded DTCs from the IPC (Instrument Panel Cluster) self-test.

Are any DTCs recorded?

Yes
For DTC U0100:00, GO to Pinpoint Test BF. Pinpoint Test 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 Body Control Systems 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. TEST the system for normal operation.