Pinpoint Test H: The Speedometer/Odometer Is Inoperative

Instrumentation, Message Center and Warning Chimes

Pinpoint Tests

Pinpoint Test H: The Speedometer/Odometer Is Inoperative

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.

The IC receives an odometer message from the PCM and stores the mileage in memory. When the IC fails to receive the odometer message for more than 2 seconds, the odometer displays dashes.

This pinpoint test is intended to diagnose the following:

- PCM
- IC



PINPOINT TEST H: THE SPEEDOMETER/ODOMETER IS INOPERATIVE

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H1 RETRIEVE THE RECORDED DTCs FROM BOTH THE CONTINUOUS AND ON-DEMAND PCM SELF-TESTS


- Check for recorded PCM DTCs from the continuous and on-demand self-tests.
- Are any PCM DTCs recorded?

Yes
REFER to Computers and Control Systems Information.

No
For an inoperative speedometer, GO to H2.

For an inoperative odometer, GO to H3.

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H2 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 H4.

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

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H3 MONITOR THE MESSAGE CENTER CIRCUIT DISPLAYS


- Enter the following diagnostic mode on the scan tool: IC DataLogger.
- Select the all segments (SEGMENTS 2) active command and command the segments on while monitoring the message center display.
- Do the message center display segments illuminate correctly?

Yes
GO to H4.

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

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H4 RETRIEVE THE RECORDED DTCs FROM BOTH THE CONTINUOUS AND ON-DEMAND IC SELF-TESTS


- Check for recorded IC DTCs from the continuous and on-demand self-tests.
- Is DTC U1900 recorded?

Yes
REFER to Information Bus.

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

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