Pinpoint Test F: The Speedometer Is Inoperative

Instrumentation, Message Center and Warning Chimes

Pinpoint Test F: The Speedometer Is Inoperative

Normal Operation

The PCM calculates the vehicle speed from the transaxle Output Shaft Speed (OSS) sensor input and from the tire size and axle ratio configuration in the PCM Vehicle Identification (VID) block. The PCM provides the Instrument Panel Cluster (IPC) with the vehicle speed data over the High Speed Controller Area Network (HS-CAN) bus. The IPC (Instrument Panel Cluster) monitors the vehicle speed input 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 U0100:00 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 U0100:00 is set in the IPC (Instrument Panel Cluster)), other observable symptoms may be an inoperative tachometer, temperature gauge or odometer.

This pinpoint test is intended to diagnose the following:

- PCM

- IPC (Instrument Panel Cluster)

PINPOINT TEST F : THE SPEEDOMETER IS INOPERATIVE

F1 RETRIEVE THE RECORDED DTCs FROM THE PCM KOEO (Key ON Engine OFF) SELF-TEST

- Check for recorded PCM DTCs from the Key ON Engine OFF (KOEO) self-test.

Are any DTCs recorded?

Yes
DIAGNOSE all PCM DTCs first. REFER to Computers and Control Systems Information.

No
GO to F2.

F2 CARRY OUT THE 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 and command the speedometer in increments of approximately 32.2 km/h (20 mph). Observe the speedometer. The speedometer starts at 0 km/h (0 mph) and moves approximately 32.2 km/h (20 mph) for each increment.

Does the speedometer begin at 0 km/h (0 mph) and move by approximately 32.2 km/h (20 mph) for each increment?

Yes
GO to F3.

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

F3 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 U0100:00, GO to Pinpoint Test AR. Pinpoint Test AR: DTC U0100:00

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. TEST the system for normal operation.