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 PCM calculates vehicle speed from the transmission Output Shaft Speed (OSS) sensor input and from the tire size and axle ratio configuration in the Vehicle Identification (VID) block of the PCM. The PCM provides the Instrument Cluster (IC) with the Vehicle Speed Sensor (VSS) signal 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.

This pinpoint test is intended to diagnose the following:

- PCM
- IC

PINPOINT TEST E: THE SPEEDOMETER IS INOPERATIVE

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E1 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 to 0, 193 km/h (120 mph), and back to 0.
- Does the speedometer reading start at 0 and move to 193 km/h (120 mph), and return to 0?

Yes
GO to E2.

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

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E2 RETRIEVE THE RECORDED DTCs FROM THE PCM KOEO SELF-TEST


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

Yes
REFER to Computers and Control Systems.

No
GO to E3.

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E3 RETRIEVE THE RECORDED DTCs FROM THE IC SELF-TEST


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

Yes
For DTC U1900, REPAIR all other DTCs first. CLEAR the DTCs. CYCLE the key OFF then ON and wait 10 seconds. REPEAT the self-test.

If DTC U1900 is still present, REFER to Module Communications Network Testing and Inspection.

For DTC U2023, RETRIEVE and REPAIR all non-network DTCs in the PCM and other modules on the network. REFER to Computers and Control Systems.

For all other DTCs, REFER to DTC Charts. Instrumentation, Message Center, and Warning Chimes

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

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