Pinpoint Test J: Incorrect Speedometer Indication
Instrumentation, Message Center and Warning Chimes
Pinpoint Tests
Pinpoint Test J: Incorrect Speedometer Indication
Normal Operation
The Instrument Cluster (IC) receives the vehicle speed signal from the PCM over the High Speed Controller Area Network (HS-CAN) communication bus. The vehicle speed data originates with the rear axle speed sensor. The rear axle speed sensor sends its data to the ABS module. The ABS module provides the rear axle speed data to the PCM over the HS-CAN communication bus. The IC monitors the vehicle speed input from the PCM and commands the speedometer with a corresponding movement of the pointer.
If the IC receives invalid vehicle speed data from the PCM 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, 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:
- Tire size configuration
- Axle ratio configuration
- IC
PINPOINT TEST J: INCORRECT SPEEDOMETER INDICATION
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J1 CHECK THE TIRE SIZE CONFIGURATION
- Enter the following diagnostic mode on the scan tool: Module Programming .
- NOTE: The correct tire size can be found on the vehicle certification label on the LH B-pillar. Refer to Vehicle Identification Codes.
- Verify that the vehicle has the correct tire size according to the certification label and the tire size is correctly configured.
- Is the tire size correct and is tire size correctly configured?
Yes
GO to J2.
No
CONFIGURE the correct tire size. TEST the system for normal operation.
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J2 CHECK THE AXLE RATIO CONFIGURATION
- Enter the following diagnostic mode on the scan tool: Module Programming .
- Verify that the axle ratio is correctly configured.
- Is the axle ratio correctly configured?
Yes
GO to J3.
No
CONFIGURE the correct axle ratio. TEST the system for normal operation.
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J3 RETRIEVE THE RECORDED DTCs FROM THE PCM KOEO SELF-TEST
- Check the recorded PCM DTCs from the Key ON Engine OFF (KOEO) self-test.
- Are any DTCs recorded?
Yes
REFER to Computers and Control Systems Information.
No
GO to J4.
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J4 RETRIEVE THE RECORDED DTCs FROM THE IC SELF-TEST
- Check for recorded IC DTCs from the self-test.
- Are any DTCs recorded?
Yes
For DTC U0100, GO to Pinpoint Test BD. Pinpoint Tests BD: DTC U0100
For all other DTCs, REFER to DTC Charts. Instrumentation, Message Center and Warning Chimes
No
GO to J5.
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J5 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 J6.
No
INSTALL a new IC. REFER to Instrument Cluster (IC) Instrument Cluster (IC). TEST the system for normal operation.
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J6 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 in 10% increments while monitoring the speedometer. The speed indicated should increase in increments of approximately 16 km/h (10 mph) for each 10% change.
- Does the speed indicated increase within specifications?
Yes
GO to J7.
No
INSTALL a new IC. REFER to Instrument Cluster (IC) Instrument Cluster (IC). TEST the system for normal operation.
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J7 CHECK THE VEHICLE SPEED INPUT USING THE IC DEALER TEST MODE
NOTE: After exiting a dealer test mode session, it is necessary to clear all IC DTCs. Carry out the IC self-test.
- Ignition ON.
- Enter the IC dealer test mode.
- NOTE: The display below uses xxx's to represent a numeric or alpha-numeric value. The value may display the same amount of characters represented by the xxx's or there may be more/less depending on the type of display. For example: VEHICLE SPEED xxx.x km/h may display VEHICLE SPEED 45 km/h. Note that there were 4 x's in the display description but only 2 digits in the actual display.
- Scroll through the displays to VEHICLE SPEED xxx.x km/h.
- NOTE: This step may require the use of an assistant to monitor the vehicle speed input and the speedometer gauge indication.
- Drive the vehicle at various speeds while monitoring both the speedometer and the vehicle speed input in the dealer test mode.
- Does the vehicle speed input agree with the position of the speedometer indication?
Yes
The speedometer is operating correctly at this time. TEST the system for normal operation.
No
INSTALL a new IC. REFER to Instrument Cluster (IC) Instrument Cluster (IC). TEST the system for normal operation.
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