Pinpoint Test I: The Speedometer Is Inoperative

Instrumentation, Message Center and Warning Chimes

Pinpoint Tests


Pinpoint Test I: The Speedometer Is Inoperative

Normal Operation

The Instrument Cluster (IC) receives the Vehicle Speed Sensor (VSS) signal from the PCM over the High Speed Controller Area Network (HS-CAN) communication bus. The ABS module uses the rear axle speed sensor to provide the VSS data to PCM. The IC monitors the VSS input from the PCM and commands the speedometer with a corresponding movement of the pointer.

If the IC receives invalid vehicle speed data from the PCM for 5 seconds or less, the IC defaults the speedometer to the last setting, based upon the last known good vehicle speed message. If the IC does not receive the vehicle speed data from the PCM for more than 5 seconds, the IC sets DTC U0100 in continuous memory and defaults the speedometer to 0 km/h (0 mph). If the vehicle speed data received is deemed invalid by the IC, the IC sets DTC U2023 and defaults the speedometer to 0 km/h (0 mph).

NOTE: If DTC U0100 is set in the IC, other observable symptoms may be an inoperative tachometer, temperature gauge or odometer.

This pinpoint test is intended to diagnose the following:

- PCM
- IC



PINPOINT TEST I: THE SPEEDOMETER IS INOPERATIVE

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I1 RETRIEVE THE RECORDED DTCs FROM THE PCM KOEO SELF-TEST


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

Yes
REFER to Computers and Control Systems Information.

No
GO to I2.

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I2 CARRY OUT THE SPEEDOMETER ACTIVE COMMAND USING THE SCAN TOOL


- Ignition ON.
- Enter the following diagnostic mode on the scan tool: IC DataLogger.
- Select the IC speedometer (SPDOMETER) active command. Command the speedometer on and off while monitoring the speedometer.
- Does the speed begin at 0 km/h (0 mph) move to 161 km/h (100 mph) and return to 0 km/h (0 mph)?

Yes
GO to I3.

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

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I3 RETRIEVE THE RECORDED DTCs FROM THE IC SELF-TEST


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

Yes
For DTC U0100, Go To Pinpoint Test BE. Pinpoint Tests BE: DTC U0100

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.

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