Pinpoint Test I: Incorrect Speedometer Indication

Instrumentation, Message Center and Warning Chimes

Pinpoint Tests

Pinpoint Test I: Incorrect Speedometer Indication

Normal Operation

The Instrument Cluster (IC) receives the vehicle speed information from the PCM over the communication network and displays it on the speedometer. If the IC receives no vehicle speed signal after 1 second, the speedometer defaults to 0.

NOTE: Items that may affect the speedometer accuracy are tire size and tire wear.

This pinpoint test is intended to diagnose the following:

- Tire size configuration
- Axle ratio configuration
- PCM concern
- IC



PINPOINT TEST I: INCORRECT SPEEDOMETER INDICATION

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I1 VERIFY THE VEHICLE TIRE SIZE AND AXLE RATIO CONFIGURATION


- Ignition ON.
- Enter the following diagnostic mode on the scan tool: Module Programming.
- Select programmable parameters and confirm that the axle ratio and tire size are correctly configured.
- Is the axle ratio and tire size correctly configured?

Yes
GO to I2.

No
CONFIGURE the axle ratio or tire size as required. TEST the system for normal operation.

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I2 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. Command the speedometer and scroll in increments of 10% while monitoring the speedometer. The speedometer should increase in increments of approximately 19 km/h (12 mph) (4.0L engine), 23 km/h (14 mph) (4.6L engine) or 26 km/h (16 mph) (5.4L engine) for each 10% change.
- Does the speedometer begin at 0 and increase within specifications?

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 PCM SELF-TEST


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

Yes
REFER to Computers and Control Systems Information.

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

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