The instrument cluster receives the vehicle speed sensor (VSS) signal which originates in the ABS module and is transmitted to the PCM over the communication network. The PCM monitors the VSS input and sends it to the instrument cluster over the communication network. With the VSS input, the instrument cluster provides the speedometer with a corresponding pointer movement.
- The speedometer/odometer is inoperative
- Powertrain control module (PCM)
- Instrument cluster
Pinpoint Test F: The Speedometer/Odometer Is Inoperative
Normal Operation
Vehicle speed information is sent to the powertrain control module (PCM) from the anti-lock brake system (ABS) module. The instrument cluster receives the vehicle speed data from the PCM over the communication network.
Possible Causes
- PCM
- instrument cluster
PINPOINT TEST F: THE SPEEDOMETER/ODOMETER IS INOPERATIVE
Your best bet ,have the vehicle hooked to a professional scan tool an checked for DTC'S - diagnostic trouble code's , before you replace parts that are not needed.
Test Step
Result / Action to Take
F1 RETRIEVE THE RECORDED DIAGNOSTIC TROUBLE CODES (DTCs) FROM BOTH THE CONTINUOUS AND ON-DEMAND PCM SELF-TESTS
- Check for the recorded PCM DTCs from the continuous and on-demand self-tests.
- Are any PCM DTCs recorded?
Yes
REFER to the Powertrain Control/Emissions Diagnosis (PC/ED) manual to continue diagnosis of the DTCs.
No
For an inoperative speedometer, GO to F2 .
For an inoperative odometer, GO to F3 .
F2 CARRY OUT THE INSTRUMENT CLUSTER SPEEDOMETER GAUGE ACTIVE COMMAND USING THE DIAGNOSTIC TOOL
- Key in ON position.
- Enter the following diagnostic mode on the diagnostic tool: Instrument Cluster Active Command.
- Select the instrument cluster speedometer gauge active command. Trigger the active command on. Observe the speedometer gauge. The speedometer gauge should start 16 km/h (10 mph) and move to 194 km/h (120 mph).
- Is the speedometer gauge within specifications?
Yes
GO to F4 .
No
GO to F5 .
F3 MONITOR THE INTEGRATED CIRCUIT DISPLAYS
- Key in ON position.
- Monitor the compass, air temperature and message center functions of the integrated circuit display.
- Do the compass, air temperature, or message center displays operate correctly?
Yes
GO to F5 .
No
Go To Pinpoint Test U to continue diagnosis of the integrated circuit display.
F4 CHECK FOR CORRECT PCM OPERATION
- Disconnect all the PCM connectors.
- Check for:
- corrosion
- pushed-out pins
- Connect all the PCM connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
Yes
INSTALL a new PCM. REFER to Section 303-14 . TEST the system for normal operation.
No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
F5 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION
- Disconnect all the instrument cluster connectors.
- Check for:
- corrosion
- pushed-out pins
- Connect all the instrument cluster connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
Yes
INSTALL a new instrument cluster. REFER to Instrument Cluster in this section. TEST the system for normal operation.
No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
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