Pinpoint Test F: Incorrect Speedometer Indication
Instrumentation, Message Center and Warning Chimes
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 (Transmission Control Module) (hybrid) receive the vehicle speed data from the Output Shaft Speed (OSS) sensor. The IC (Instrument Cluster) monitors the vehicle speed input from the PCM or TCM (Transmission Control Module) and commands the speedometer with a corresponding movement of the pointer.
The IC (Instrument Cluster) 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 (Instrument Cluster) receives invalid vehicle speed data from the PCM or TCM (Transmission Control Module) for 5 seconds or less, the IC (Instrument Cluster) defaults the speedometer to the last setting, based upon the last known good vehicle speed message. If the IC (Instrument Cluster) does not receive the vehicle speed data from the PCM or the TCM (Transmission Control Module), or if the data received is deemed invalid, the IC (Instrument Cluster) sets DTC U0100 (non-hybrid) or U0101 (hybrid) in continuous memory and defaults the speedometer to 0 km/h (0 mph).
If the IC (Instrument Cluster) receives invalid data for more than 5 seconds, the IC (Instrument Cluster) sets DTC U2197 and defaults the speedometer to 0 km/h (0 mph).
NOTE: If DTC U0100 is set in the IC (Instrument Cluster), 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 (Transmission Control Module) (hybrid)
- IC (Instrument Cluster)
PINPOINT TEST F : INCORRECT SPEEDOMETER INDICATION
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.
F2 RETRIEVE THE RECORDED DTCs FROM THE IC (Instrument Cluster) SELF-TEST
- Check for recorded IC (Instrument Cluster) DTCs from the continuous and on-demand self-test.
Are any DTCs recorded?
Yes
For DTC U0100, GO to Pinpoint Test AV Pinpoint Test AV: DTC U0100.
For DTC U0101, GO to Pinpoint Test AW Pinpoint Test AW: DTC U0101.
For all other DTCs, REFER to DTC Charts Instrumentation, Message Center and Warning Chimes.
No
GO to F3.
F3 RETRIEVE THE RECORDED DTCs FROM THE PCM KOEO (Key ON Engine OFF) AND THE TCM (Transmission Control Module) SELF-TESTS
- Check for recorded PCM or TCM (Transmission Control Module) DTCs from the Key ON Engine OFF (KOEO) or the TCM (Transmission Control Module) self-test.
Are any PCM or TCM (Transmission Control Module) DTCs recorded?
Yes
REFER to Computers and Control Systems Information.
No
GO to F4.
F4 CARRY OUT THE SPEEDOMETER ACTIVE COMMAND USING THE SCAN TOOL
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: IC (Instrument Cluster) DataLogger.
- Select the IC (Instrument Cluster) 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 (Instrument Cluster). REFER to Instrument Cluster (IC) . TEST the system for normal operation.
F5 CHECK THE VEHICLE SPEED INPUT USING THE IC (Instrument Cluster) 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 (Instrument Cluster). REFER to Instrument Cluster (IC) . TEST the system for normal operation.
F6 MONITOR THE PCM VEHICLE SPEED SENSOR (VSS (Vehicle Speed Sensor)) 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 (Transmission Control Module) DataLogger (Hybrid).
- Select the vehicle speed (VSS (Vehicle Speed Sensor)) (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 (Instrument Cluster) ?
Yes
The speedometer is operating correctly at this time.
No
INSTALL a new IC (Instrument Cluster). REFER to Instrument Cluster (IC) . TEST the system for normal operation.