Diagnostic Routine H

Diagnostic Routine H

Diagnostic Overview

Incorrect Speedometer Indication

Normal Operation and Fault Conditions

REFER to Speedometer .

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.

Visual Inspection and Diagnostic Pre-checks

Verify that the tire size on the vehicle matches the tire size listed on the VC (Vehicle Certification) label. REFER to Vehicle Certification (VC) Codes .

Pinpoint Test

1. CHECK THE TIRE SIZE CONFIGURATION

1. Using the scan tool, view Module Programming for the programmed tire size.

NOTE: The correct tire size can be found on the VC (Vehicle Certification) label on the LH (Left Hand) B-pillar. REFER to Vehicle Certification (VC) Codes .

2. Verify that the tire size configuration matches the VC (Vehicle Certification) label.

Is the tire size correctly configured?








2. CHECK THE AXLE RATIO CONFIGURATION

1. Using the scan tool, view Module Programming for the programmed axle ratio.

2. Verify the axle ratio is correctly configured.

Is the axle ratio correctly configured?








3. RETRIEVE THE RECORDED DTCs (Diagnostic Trouble Codes) FROM THE PCM (Powertrain Control Module) KOEO (Key ON Engine OFF) SELF-TEST

1. Using a scan tool, perform the PCM (Powertrain Control Module) KOEO (Key ON Engine OFF) self-test.

Are any DTCs (Diagnostic Trouble Codes) recorded?








4. RETRIEVE THE RECORDED DTCs (Diagnostic Trouble Codes) FROM THE IPC (Instrument Panel Cluster) SELF-TEST

1. Using a scan tool, perform the IPC (Instrument Panel Cluster) self-test.

Are any DTCs (Diagnostic Trouble Codes) recorded?








5. CARRY OUT THE SPEEDOMETER ACTIVE COMMAND USING THE SCAN TOOL

1. Ignition ON.

2. Using a scan tool, view the IPC (Instrument Panel Cluster) PIDs (Parameter Identifications).

3. Select the IPC (Instrument Panel Cluster) speedometer (SPDOMETER) PID (Parameter Identification). Command the speedometer in 10% increments while monitoring the speedometer. The speed indicated should increase in increments of approximately 23 km/h (14.3 mph) for each 10% change.





Does the speed indicated increase within the specified range?








6. CHECK THE PCM (Powertrain Control Module) VSS (Vehicle Speed Sensor) PID (Parameter Identification)

1. Using a scan tool, view the PCM (Powertrain Control Module) PIDs (Parameter Identifications).

2. Select and monitor the PCM (Powertrain Control Module) vehicle speed (VSS (Vehicle Speed Sensor)) PID (Parameter Identification) with the speedometer indicating 32.2 km/h (20 mph), 64.4 km/h (40 mph) and 96.6 km/h (60 mph).

Does the speedometer indicate between 30.6 km/h (19 mph)-33.8 km/h (21 mph), 62.8 km/h (39 mph)-69.2 km/h (43 mph) and 93.3 km/h (58 mph)-103 km/h (64 mph) at the 3 PCM PID (Parameter Identification) values?








7. OBSERVE THE SPEEDOMETER OPERATION

1. Ignition ON.

2. Observe the speedometer with the vehicle at various wheel speeds and stopping frequently.

Does the speedometer begin at 0 km/h (0 mph) and fully return to the 0 km/h (0 mph) position when the wheels are stopped?