Pinpoint Tests AD: The Over-Temperature Warning Indicator Is Never/Always On

Instrumentation, Message Center and Warning Chimes

Pinpoint Tests

Pinpoint Test AD: The Over-Temperature Warning Indicator Is Never/Always On (Hybrid Only)

Normal Operation

The Instrument Cluster (IC) receives the engine and motor over-temperature command 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 IC to turn the over-temperature warning indicator on.

If the engine or motor over-temperature message is missing, the IC sets DTC U0100 in continuous memory and the over-temperature warning indicator remains in the last indication mode (on or off). If the engine over-temperature message is deemed invalid by the IC, the IC defaults the over-temperature warning indicator on.

This pinpoint test is intended to diagnose the following:

- PCM
- IC



PINPOINT TEST AD: THE OVER-TEMPERATURE WARNING INDICATOR IS NEVER/ALWAYS ON (HYBRID ONLY)

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AD1 CARRY OUT THE IC WARNING LAMPS AND CHIME ACTIVE COMMAND USING THE SCAN TOOL


- Ignition ON.
- Enter the following diagnostic mode on the scan tool: IC DataLogger.
- Select the IC engine over-temperature warning indicator (OVTEMP_LMP) active command. Command the engine over-temperature warning indicator on and off. Observe the over-temperature warning indicator.
- Does the over-temperature warning indicator illuminate when commanded on, and turn off when commanded off?

Yes
GO to AD2.

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

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AD2 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 AD3.

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AD3 RETRIEVE THE RECORDED DTCs FROM THE IC SELF-TEST


- Check for recorded IC DTCs from the self-test.
- Is DTC U0100 recorded?

Yes
Go To Pinpoint Test AS. Pinpoint Tests AS: DTC U0100

No
INSTALL a new PCM. TEST the system for normal operation.

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