Pinpoint Test H: The Speedometer Is Inoperative

Instrumentation, Message Center and Warning Chimes

Pinpoint Tests

Pinpoint Test H: The Speedometer Is Inoperative

Normal Operation

The PCM receives the Vehicle Speed Sensor (VSS) data from the Output Shaft Speed (OSS) sensor. The Instrument Cluster (IC) receives the vehicle speed signal from the PCM over the High Speed Controller Area Network (HS-CAN) communication bus. The IC monitors the VSS input from the PCM and commands the speedometer with a corresponding movement of the pointer.

If the IC does not receive the 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 or if the data received is deemed invalid, the IC sets DTC U0100 in continuous memory 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 H: THE SPEEDOMETER IS INOPERATIVE

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H1 CARRY OUT THE IC 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 and command the speedometer on then off. Observe the speedometer. The speedometer starts at 0 km/h (0 mph) and moves to full stop, 193 km/h (120 mph) (Edge) or 225 km/h (140 mph) (MKX) and returns to 0 km/h (0 mph).
- Does the speedometer reading increase within the specifications?

Yes
GO to H2.

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

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H2 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 H3.

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H3 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 AT. Pinpoint Tests AT: DTC U0100

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

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