Pinpoint Test E: The Speedometer Is Inoperative

Instrumentation, Message Center and Warning Chimes

Pinpoint Tests

Pinpoint Test E: The Speedometer Is Inoperative

Normal Operation

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

If the vehicle speed data is missing or invalid for 5 seconds or less, the IPC defaults the speedometer to the last setting, based upon the last known good vehicle speed message received.

If the IPC does not receive the vehicle speed data from the PCM for more than 5 seconds, the IPC sets DTC U0100:00 in continuous memory and defaults the speedometer to 0 km/h (0 mph).

If the vehicle speed data is missing or invalid for 5 seconds or more, the IPC sets DTC U0401:00 and defaults the speedometer to 0 km/h (0 mph).

NOTE: If DTC U0100:00 is set in the IPC, other observable symptoms may be an inoperative tachometer, temperature gauge or odometer.

This pinpoint test is intended to diagnose the following:

- PCM
- IPC


PINPOINT TEST E: THE SPEEDOMETER IS INOPERATIVE

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E1 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 DTCs recorded?

Yes
DIAGNOSE all PCM DTCs first. REFER to Computers and Control Systems.

No
GO to E2.

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E2 CARRY OUT THE SPEEDOMETER ACTIVE COMMAND USING THE SCAN TOOL


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

Yes
GO to E3.

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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E3 RETRIEVE THE RECORDED DTCs FROM THE IPC SELF-TEST


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

Yes
For DTC U0100:00, GO to Pinpoint Test AU. Pinpoint Tests AU: DTC U0100:00

For DTC U0401:00, RETRIEVE and REPAIR all non-network DTCs in the PCM and other modules on the network. REFER to Computers and Control Systems and Multifunction Electronic Modules Testing and Inspection for a list of all DTCs.

For all other DTCs, REFER to DTC Charts.

No
INSTALL a new PCM. REFER to Electronic Engine Controls Service and Repair. TEST the system for normal operation.

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