Pinpoint Test E: Incorrect Temperature Gauge Indication
Instrumentation, Message Center and Warning Chimes
Pinpoint Tests
Pinpoint Test E: Incorrect Temperature Gauge Indication
Normal Operation
The PCM uses the Cylinder Head Temperature (CHT) sensor to measure the engine temperature. The Instrument Panel Cluster (IPC) receives the engine temperature data from the PCM over the High Speed Controller Area Network (HS-CAN). The IPC monitors the engine temperature data received from the PCM and commands the temperature gauge indication with a corresponding movement of the pointer.
If the IPC receives invalid engine temperature data from the PCM for 5 seconds or less, the IPC defaults the temperature gauge to the last setting, based upon the last known good engine temperature status message. If the IPC does not receive the engine temperature status message from the PCM or if the data received is deemed invalid for more than 5 seconds, the IPC sets DTC U0100:00 in continuous memory and defaults the temperature gauge to cold (C). If the engine temperature data is deemed invalid by the IPC, the IPC sets DTC U0401:00 and defaults the temperature gauge to cold (C).
NOTE: If DTC U0100:00 sets in the IPC, other observable symptoms may be an inoperative speedometer, tachometer or odometer.
This pinpoint test is intended to diagnose the following:
- PCM concern
- IPC
PINPOINT TEST E: INCORRECT TEMPERATURE GAUGE INDICATION
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E1 CHECK FOR CORRECT OPERATION OF THE COOLING SYSTEM
- Verify the engine cooling system and thermostat are functioning correctly.
- Do the engine cooling system and thermostat operate correctly?
Yes
GO to E2.
No
REFER to Engine Cooling Testing and Inspection.
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E2 RETRIEVE THE RECORDED DTCs FROM THE PCM KOEO SELF-TEST
- Check the recorded PCM DTCs from the KOEO self-test.
- Are any DTCs recorded?
Yes
REFER to Computers and Control Systems. TEST the system for normal operation.
No
GO to E3.
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E3 RETRIEVE THE RECORDED DTCs FROM THE IPC SELF-TEST
- Check for recorded IPC DTCs from the self-test.
- Are any DTCs recorded?
Yes
For DTC U0100:00, GO to Pinpoint Test AT Pinpoint Tests AT: DTC U0100:00. For all other DTCs, REFER to DTC Charts. Instrumentation, Message Center and Warning Chimes
No
GO to E4.
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E4 CARRY OUT THE TEMPERATURE GAUGE ACTIVE COMMAND USING THE SCAN TOOL
NOTE: The coolant temperature should range between 0-59°C (32-138°F) with the gauge in the cold (C) range, between 60-120°C (140-248°F) with the gauge in the normal or mid-range and above 121°C (250°F) with the gauge in the hot (H) range.
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: IPC DataLogger.
- NOTE: Make sure the temperature gauge is commanded to full cold before beginning this step.
- Select the IPC temperature gauge (ENGCOOLNT) active command. Command the temperature gauge according to the following table:
- Does the temperature gauge operate according to the above specifications?
Yes
GO to E5.
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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E5 CHECK THE PCM TEMPERATURE PID
NOTE: The coolant temperature should range between 0-59°C (32-138°F) with the gauge in the cold (C) range, between 60-120°C (140-248°F) with the gauge in the normal or mid-range and above 121°C (250°F) with the gauge in the hot (H) range.
- Enter the following diagnostic mode on the scan tool: PCM DataLogger.
- Ignition ON.
- Select the PCM temperature PID (CHT). With the engine running, monitor the PCM temperature PID.
- Does the PCM PID agree with the position of the temperature gauge indication?
Yes
The temperature gauge is operating correctly at this time.
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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