Pinpoint Test F: Incorrect Speedometer Indication
Instrumentation and Warning Chimes
Pinpoint Tests
Pinpoint Test F: Incorrect Speedometer Indication
Normal Operation
The Instrument Cluster (IC) receives the vehicle speed data from the PCM over the High Speed Controller Area Network (HS-CAN) bus lines. The PCM receives the vehicle speed data from the Output Shaft Speed (OSS) sensor. The IC, upon receipt of the Vehicle Speed Sensor (VSS) data, commands the speedometer to sweep to the correct position. The IC sets DTC U0100 in continuous memory if the VSS data is not received for more than 5 seconds and the speedometer does not operate, indicating 0 MPH. If VSS data is missing or invalid for less than 5 seconds, the speedometer stops registering vehicle speed changes and freezes at the last position on the gauge.
This pinpoint test is intended to diagnose the following:
- Axle ratio configuration
- Tire size configuration
- PCM concern
- IC
PINPOINT TEST F: INCORRECT SPEEDOMETER INDICATION
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F1 OBSERVE THE SPEEDOMETER OPERATION
- Ignition ON.
- Observe the speedometer while driving the vehicle at various speeds and stopping frequently.
- Does the speedometer begin at 0 km/h (0 mph) and fully return to the 0 km/h (0 mph) position when the vehicle is stopped?
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 CHECK THE TIRE SIZE AND AXLE RATIO CONFIGURATION
- Enter the following diagnostic mode on the scan tool: PCM Module Programming.
- NOTE: The correct tire size can be found on the vehicle certification label on the LH B-pillar. Refer to Identification Codes Application and ID.
- From the programmable parameters menu, verify that the vehicle has the correct tire size according to the certification label and the tire size and axle ratio are correctly configured in the PCM.
- Is the tire size correct and are the tire size and axle ratio parameters correctly configured?
Yes
GO to F3.
No
CONFIGURE the PCM for the correct tire size. TEST the system for normal operation.
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F3 RETRIEVE THE RECORDED DTCs FROM THE PCM KOEO SELF-TEST
- Retrieve the recorded DTCs from the PCM Key ON Engine OFF (KOEO) self-test.
- Are any DTCs retrieved?
Yes
REFER to Computers and Control Systems.
No
GO to F4.
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F4 RETRIEVE THE RECORDED DTCs FROM THE IC SELF-TEST
- Retrieve the recorded DTCs from the IC self-test.
- Is DTC U0100 retrieved?
Yes
GO to Pinpoint Test AK. Pinpoint Test AK: DTC U0100
No
GO to F5.
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F5 CARRY OUT THE IC GAUGES 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 in increments of approximately 32.2 km/h (20 mph). Observe the speedometer. The speedometer starts at 0 km/h (0 mph) and moves approximately 32.2 km/h (20 mph) for each increment.
- Does the speedometer begin at 0 km/h (0 mph) and move by approximately 32.2 km/h (20 mph) for each increment?
Yes
GO to F6.
No
INSTALL a new IC. REFER to Instrument Cluster (IC) Instrument Cluster (IC). TEST the system for normal operation.
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F6 MONITOR PCM VSS PIDs
NOTE: This step may require the assistance of a second person to monitor and record the scan tool data.
- Enter the following diagnostic mode on the scan tool: PCM DataLogger.
- Select the PCM vehicle speed (VSS) PID and monitor the PID while driving the vehicle at 32 km/h (20 mph), 64 km/h (40 mph) and 97 km/h (60 mph).
- Does the speedometer indicate between 31-34 km/h (19-21 mph), 63-69 km/h (39-43 mph) and 93-103 km/h (58-64 mph) at the 3 PCM PID values?
Yes
The speedometer is operating correctly at this time.
No
INSTALL a new IC. REFER to Instrument Cluster (IC) Instrument Cluster (IC). TEST the system for normal operation.
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