Pinpoint Test J: The Speedometer Is Inoperative

Instrumentation, Message Center and Warning Chimes

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 (Instrument Panel Cluster). The IPC (Instrument Panel Cluster) 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 (Instrument Panel Cluster) receives invalid vehicle speed data for 5 seconds or less, the IPC (Instrument Panel Cluster) defaults the speedometer to the last setting, based upon the last known good vehicle speed message. If the IPC (Instrument Panel Cluster) does not receive the vehicle speed data from the PCM for more than 5 seconds, the IPC (Instrument Panel Cluster) 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 (Instrument Panel Cluster) for 5 seconds or longer, the IPC (Instrument Panel Cluster) sets DTC U0401:68 and defaults the speedometer to 0 km/h (0 mph).

NOTE: If DTC U0100:87 is set in the IPC (Instrument Panel Cluster) , other observable symptoms can be an inoperative tachometer, temperature gauge or odometer.

This pinpoint test is intended to diagnose the following:

- PCM

- IPC (Instrument Panel Cluster)

PINPOINT TEST J : THE SPEEDOMETER IS INOPERATIVE

J1 CARRY OUT THE IPC (Instrument Panel Cluster) SPEEDOMETER ACTIVE COMMAND USING THE SCAN TOOL

- Ignition ON.

- Enter the following diagnostic mode on the scan tool: IPC (Instrument Panel Cluster) DataLogger.

- Select the IPC (Instrument Panel Cluster) 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 257 km/h (160 mph) and return to 0 km/h (0 mph)?

Yes
GO to J2.

No
INSTALL a new IPC (Instrument Panel Cluster). REFER to Instrument Panel Cluster (IPC) . TEST the system for normal operation.

J2 RETRIEVE THE RECORDED PCM DTCs FROM THE KOEO (Key ON Engine OFF) 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.

J3 RETRIEVE THE RECORDED DTCs FROM THE IPC (Instrument Panel Cluster) SELF-TEST

- Check for recorded DTCs from the IPC (Instrument Panel Cluster) self-test.

Are any DTCs recorded?

Yes
For DTC U0100:87, GO to Pinpoint Test AQ Pinpoint Test AQ: DTC U0100:87.

For DTC U0401:68, RETRIEVE and REPAIR all non-network DTCs in the PCM and other modules on the network.

For all other DTCs, REFER to DTC Charts Instrumentation, Message Center and Warning Chimes.

No
INSTALL a new PCM. TEST the system for normal operation.