Pinpoint Test G: Incorrect Speedometer Indication
Instrumentation, Message Center and Warning Chimes
Pinpoint Test G: Incorrect Speedometer Indication
Normal Operation
The Instrument Panel Cluster (IPC) receives the Vehicle Speed Sensor (VSS) signal from the PCM (non-hybrid) or from the Transmission Control Module (TCM) (hybrid) over the High Speed Controller Area Network (HS-CAN) communication bus. The PCM or TCM receives the VSS input from the Output Shaft Speed (OSS). The IPC monitors the VSS input from the PCM or TCM and commands the speedometer with a corresponding movement of the pointer.
The IPC provides a tolerance which biases 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 vehicle speed data is missing for 5 seconds or less or if the IPC receives invalid vehicle speed data for 5 seconds or less, the IPC defaults the speedometer to the last setting, based upon the last known good vehicle speed message. If the IPC does not receive the vehicle speed data for more than 5 seconds, the IPC sets DTC U0100:00 (non-hybrid) or U0101:00 (hybrid) in continuous memory and defaults the speedometer to 0 km/h (0 mph). If the vehicle speed data received is deemed invalid by the IPC for 5 seconds or more, the IPC sets DTC U0401:68 (non-hybrid) or U0402:68 and defaults the speedometer to 0 km/h (0 mph).
Factors that could potentially affect the accuracy of the speedometer are configurable items such as axle ratio and tire size.
NOTE: If DTC U0100:00 is set in the IPC, 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 or driveline type configuration
- PCM concern
- IPC
PINPOINT TEST G: INCORRECT SPEEDOMETER INDICATION
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G1 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), indicate the different vehicle speeds and fully return to the 0 km/h (0 mph) position when the vehicle is stopped?
Yes
GO to G2.
No
INSTALL a new IPC. REFER to Instrument Panel Cluster (IPC) Instrument Panel Cluster (IPC). TEST the system for normal operation.
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G2 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 Identification Codes Application and ID.
- Select programmable parameters and verify that the vehicle has the correct tire size according to the certification label and the tire size is correctly configured in the PCM.
- Is the tire size correct and is the tire size parameter correctly configured?
Yes
GO to G3.
No
CONFIGURE the tire size. TEST the system for normal operation.
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G3 CHECK THE AXLE RATIO OR DRIVELINE TYPE CONFIGURATION
- Enter the following diagnostic mode on the scan tool: Module Programming .
- Select programmable parameters and verify that the axle ratio or driveline type is correctly configured in the PCM.
- Is the axle ratio or driveline type parameter correctly configured?
Yes
GO to G4.
No
CONFIGURE the axle ratio or driveline type. TEST the system for normal operation.
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G4 RETRIEVE THE RECORDED DTCs FROM THE PCM AND TCM KOEO SELF-TEST
- Check for recorded PCM and TCM DTCs from the Key ON Engine OFF (KOEO) self-test.
- Are any DTCs recorded?
Yes
DIAGNOSE all PCM and TCM DTCs first. REFER to Computers and Control Systems Information.
No
GO to G5.
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G5 RETRIEVE THE RECORDED DTCs FROM THE IPC SELF-TEST
- Check for recorded DTCs from the IPC self-test.
- Are any DTCs recorded?
Yes
For DTC U0100:00 (non-hybrid), GO to Pinpoint Test BF. Pinpoint Tests BF: DTC U0100:00
For DTC U0100:01 (hybrid), GO to Pinpoint Test BG. Pinpoint Tests BG: DTC U0101:00
For DTC U0401:68 (non-hybrid) or U0402:68 (hybrid), RETRIEVE and REPAIR all non-network DTCs in the PCM and other modules on the network. REFER to Computers and Control Systems Information and Multifunction Electronic Modules Testing and Inspection for a list of all DTCs.
For all other DTCs, REFER to DTC Charts. Instrumentation, Message Center and Warning Chimes
No
GO to G6.
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G6 CARRY OUT THE IPC SPEEDOMETER ACTIVE COMMAND USING THE SCAN TOOL
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: IPC DataLogger .
- Select the IPC speedometer (SPDOMETER) active command. Command the speedometer according to the following table while monitoring the speedometer.
- Does the speedometer indicate the approximate speed according to the above specifications?
Yes
GO to G7.
No
INSTALL a new IPC. REFER to Instrument Panel Cluster (IPC) Instrument Panel Cluster (IPC). TEST the system for normal operation.
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G7 CHECK THE PCM VSS PIDs
- 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 IPC. REFER to Instrument Panel Cluster (IPC) Instrument Panel Cluster (IPC). TEST the system for normal operation.
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