Pinpoint Test F: The Speedometer Is Inoperative
Instrumentation, Message Center and Warning Chimes
Pinpoint Tests
Pinpoint Test F: 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.
If the vehicle speed data is missing for 5 seconds or less or if the IC receives invalid vehicle speed data for 5 seconds or less, the IC defaults the speedometer to the last setting, based upon the last known good vehicle speed message. If the IC does not receive the vehicle speed data from the PCM for more than 5 seconds, the IC sets DTC U0100 in continuous memory and defaults the speedometer to 0 km/h (0 mph). If the vehicle speed data received is deemed invalid by the IC for 5 seconds or longer, the IC sets DTC U2023 and defaults the speedometer to 0 km/h (0 mph).
NOTE: If DTC U0100 is set in the IC, other observable symptoms may be an inoperative tachometer, temperature gauge or odometer.
This pinpoint test is intended to diagnose the following:
- PCM
- IC
PINPOINT TEST F: THE SPEEDOMETER IS INOPERATIVE
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F1 CARRY OUT THE 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 on and off while monitoring the speedometer.
- Does the speed begin at 0 km/h (0 mph), move to 193 km/h (120 mph) and return to 0 km/h (0 mph)?
Yes
GO to F2.
No
INSTALL a new IC. REFER to Instrument Cluster (IC) Instrument Cluster (IC). TEST the system for normal operation.
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F2 RETRIEVE THE RECORDED DTCs FROM BOTH CONTINUOUS AND ON-DEMAND PCM SELF-TESTS
- Check the recorded PCM DTCs from the continuous and on-demand self-tests.
- Are any DTCs recorded?
Yes
REFER to Computers and Control Systems Information.
No
GO to F3.
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F3 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.
- Are any DTCs recorded?
Yes
For DTC U0100, Go To Pinpoint Test AE. Pinpoint Tests AE: DTC U0100
For all other DTCs, REFER to DTC Charts. Instrumentation, Message Center and Warning Chimes
No
GO to F4.
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F4 CHECK THE IC VSS INPUT
- Enter the following diagnostic mode on the scan tool: IC DataLogger.
- Select the IC vehicle speed PID (VSS_IC). Drive the vehicle and monitor the VSS PID at various speeds.
- Does the PID display a VSS input into the cluster?
Yes
INSTALL a new IC. REFER to Instrument Cluster (IC) Instrument Cluster (IC). TEST the system for normal operation.
No
INSTALL a new PCM. TEST the system for normal operation.
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