Pinpoint Test J: The Speedometer Is Inoperative
Instrumentation, Message Center and Warning Chimes
Pinpoint Tests
Pinpoint Test J: The Speedometer Is Inoperative
Normal Operation
The Instrument Panel Cluster (IPC) receives the vehicle speed signal from the PCM over the High Speed Controller Area Network (HS-CAN) communication bus. The PCM receives vehicle speed from the Output Shaft Speed (OSS) sensor and uses axle ratio and tire Vehicle Identification (VID) block to generate the vehicle speed data sent to the IPC. The IPC monitors the vehicle speed input from the PCM and commands the speedometer with a corresponding movement of the pointer.
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 from the PCM for more than 5 seconds, the IPC sets DTC U0100:87 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 longer, the IPC sets DTC U0401:68 and defaults the speedometer to 0 km/h (0 mph).
NOTE: If DTC U0100:87 is set in the IPC, other observable symptoms can be an inoperative tachometer, temperature gauge or odometer.
This pinpoint test is intended to diagnose the following:
- PCM
- IPC
PINPOINT TEST J: THE SPEEDOMETER IS INOPERATIVE
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J1 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 on and off while monitoring the speedometer.
- Does the speed begin at 0 km/h (0 mph) move to 180 km/h (120 mph) or 290 km/h (160 mph) (GT500) and return to 0 km/h (0 mph)?
Yes
GO to J2.
No
INSTALL a new IPC. REFER to Instrument Panel Cluster (IPC) Service and Repair. TEST the system for normal operation.
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J2 RETRIEVE THE RECORDED PCM DTCs FROM THE KOEO SELF-TEST
- Check for recorded PCM DTCs from the Key ON Engine OFF (KOEO) self-test.
- Are any PCM DTCs recorded?
Yes
DIAGNOSE all PCM DTCs first. REFER to Computers and Control Systems Information.
No
GO to J3.
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J3 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 U0100:87, GO to Pinpoint Test AQ. Pinpoint Tests AQ: DTC U0100:87
For DTC U0401:68, RETRIEVE and REPAIR all non-network DTCs in the PCM and other modules on the network. REFER to Computers and Control Systems Information and Body Control Systems for a list of all DTCs.
For all other DTCs, REFER to DTC Charts. Instrumentation, Message Center and Warning Chimes
No
INSTALL a new PCM. REFER to Computers and Control Systems. TEST the system for normal operation.
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