Pinpoint Test F: Incorrect Speedometer Indication
Instrumentation, Message Center and Warning Chimes
Pinpoint Tests
Pinpoint Test F: Incorrect Speedometer Indication
Normal Operation
The Instrument Cluster (IC) receives the vehicle speed signal from the PCM (non-hybrid) and from the Transmission Control Module (TCM) (hybrid) over the High Speed Controller Area Network (HS-CAN) communication bus. The PCM (non-hybrid) or TCM (hybrid) receive the vehicle speed data from the Output Shaft Speed (OSS) sensor. The IC monitors the vehicle speed input from the PCM or TCM and commands the speedometer with a corresponding movement of the pointer.
The IC provides a tolerance which bases the speed indication and displays between 3% below and 7% higher than actual vehicle speed. This means that with an actual vehicle speed of 96.6 km/h (60 mph), the speedometer may indicate between 93.7-103.3 km/h (58.2-64.2 mph). Other factors that could potentially affect the speedometer accuracy are incorrect tire size, tire size configuration and axle ratio configuration.
If the IC receives invalid vehicle speed data from the PCM or TCM 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 or the TCM, or if the data received is deemed invalid, the IC sets DTC U0100 (non-hybrid) or U0101 (hybrid) in continuous memory and defaults the speedometer to 0 km/h (0 mph).
If the IC receives invalid data for more than 5 seconds, the IC sets DTC U2197 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 (non-hybrid) or odometer.
This pinpoint test is intended to diagnose the following:
- Axle ratio configuration
- Tire size configuration
- PCM concern (non-hybrid)
- TCM (hybrid)
- IC
PINPOINT TEST F: INCORRECT SPEEDOMETER INDICATION
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F1 CHECK FOR CORRECT AXLE RATIO AND TIRE SIZE CONFIGURATION
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: Module Programming.
- Select programmable parameters and confirm that the axle ratio and the tire size are correctly configured.
- Are the axle ratio and tire size correctly configured?
Yes
GO to F2.
No
CONFIGURE the axle ratio or tire size as required. TEST the system for normal operation.
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F2 RETRIEVE THE RECORDED DTCs FROM THE IC SELF-TEST
- Check for recorded IC DTCs from the continuous and on-demand self-test.
- Are any DTCs recorded?
Yes
For DTC U0100, GO to Pinpoint Test AV. Pinpoint Tests AV: DTC U0100
For DTC U0101, GO to Pinpoint Test AW. Pinpoint Tests AW: DTC U0101
For all other DTCs, REFER to DTC Charts. Instrumentation, Message Center and Warning Chimes
No
GO to F3.
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F3 RETRIEVE THE RECORDED DTCs FROM THE PCM KOEO AND THE TCM SELF-TESTS
- Check for recorded PCM or TCM DTCs from the Key ON Engine OFF (KOEO) or the TCM self-test.
- Are any PCM or TCM DTCs recorded?
Yes
REFER to Computers and Control Systems Information.
No
GO to F4.
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F4 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 20 km/h (12 mph) for each 10% change.
- Does the speed indicated increase within specifications?
Yes
GO to F5.
No
INSTALL a new IC. REFER to Instrument Cluster (IC) Instrument Cluster (IC). TEST the system for normal operation.
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F5 CHECK THE VEHICLE SPEED INPUT USING THE IC DEALER TEST MODE
- Ignition ON.
- Enter Instrument Cluster (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: Exxxx.x (base cluster) or SPEEDOMETER xxxx.x km/h (message center cluster) may display E45 or SPEEDOMETER 45 km/h. Note that there were 5 x's in the display description but only 2 digits in the actual display.
- Scroll down to Exxxx.x (base cluster) or SPEEDOMETER xxxx.x km/h (message center cluster).
- 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
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 THE PCM VEHICLE SPEED SENSOR (VSS) PID
NOTE: Verify that the tire size matches the vehicle's configured tire size.
- Enter the following diagnostic mode on the scan tool: PCM DataLogger (Non-Hybrid) or TCM DataLogger (Hybrid).
- Select the vehicle speed ( VSS) (non-hybrid) or (VSS_TCM) (hybrid) PID. Monitor the vehicle speed PID while driving the vehicle.
- Does the vehicle speed PID match the speedometer reading on the IC?
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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