Pinpoint Test C: The Speedometer Is Inoperative
- Normal Operation and Fault Conditions
See Speedometer. REFER to: Instrument Panel Cluster (IPC) - 3.5L Duratec (202kW/275PS)/3.5L EcoBoost (235kW/320PS) - System Operation and Component Description .
If the vehicle speed message is missing or invalid for 5 seconds or longer, the IPC defaults the speedometer to 0 km.
Possible Sources
- Communication concern
- GWM concern
- PCM concern
- ABS concern
- IPC
- C1 RETRIEVE THE RECORDED DIAGNOSTIC TROUBLE CODES (DTCS) FROM THE IPC (INSTRUMENT PANEL CLUSTER) SELF-TEST
- Ignition ON.
- Using a diagnostic scan tool, perform the IPC self-test.
Are any Diagnostic Trouble Codes (DTCs) recorded?
Yes REFER to Diagnostic Trouble Code (DTC) Chart . No GO to C2 - C2 RETRIEVE THE RECORDED DIAGNOSTIC TROUBLE CODES (DTCS) FROM THE ABS (ANTI-LOCK BRAKE SYSTEM) MODULE SELF-TEST
- Using a diagnostic scan tool, perform the ABS module self-test.
Are any Diagnostic Trouble Codes (DTCs) recorded?
Yes REFER to: Anti-Lock Brake System (ABS) and Stability Control . No GO to C3 - C3 PERFORM THE PCM (POWERTRAIN CONTROL MODULE) KOEO (KEY ON, ENGINE OFF) SELF-TEST
- Using a diagnostic scan tool, perform the PCMKOEO self-test.
Are any Diagnostic Trouble Codes (DTCs) recorded?
Yes REFER to POWERTRAIN CONTROL MODULE (PCM) - 3.5L Duratec (202kW/275PS) or POWERTRAIN CONTROL MODULE (PCM) - 3.5L EcoBoost (235kW/320PS) . No GO to C4 - C4 CHECK THE GWM (GATEWAY MODULE A) DIAGNOSTIC TROUBLE CODES (DTCS)
- Using a diagnostic scan tool, retrieve the GWM Continuous Memory Diagnostic Trouble Codes (CMDTCs).
Are any Diagnostic Trouble Codes (DTCs) recorded?
Yes No GO to C5 - C5 PERFORM THE SPEEDOMETER ACTIVE COMMAND USING A DIAGNOSTIC SCAN TOOL
- Using a diagnostic scan tool, view the IPC Parameter Identifications (PIDs).
- Access the IPC and control the SPDOMETER (%) PID
- Command the speedometer on and off while monitoring the speedometer.
Does the speed begin at 0 km/h (0 mph), move to 193 km/h (120 mph) and return to 0 km/h (0 mph)?
Yes INSTALL a new PCM. Refer to POWERTRAIN CONTROL MODULE (PCM) - 3.5L Duratec (202kW/275PS) or POWERTRAIN CONTROL MODULE (PCM) - 3.5L EcoBoost (235kW/320PS) . No INSTALL a new IPC. Refer to INSTRUMENT PANEL CLUSTER (IPC) .