Ford Mustang 2005 Workshop Manual page 40

2005 Mustang Workshop Manual
AE5 OBSERVE THE SPEEDOMETER OPERATION
Ignition ON.
Observe the speedometer while driving the vehicle at various speeds and stopping frequently.
Does the speedometer begin at 0 km/h (0 mph), indicate the different vehicle speeds and fully return to the
0 km/h (0 mph) position when the vehicle is stopped?
AE6 CARRY OUT THE INSTRUMENT CLUSTER SPEEDOMETER ACTIVE COMMAND USING THE SCAN TOOL
Ignition ON.
Enter the following diagnostic mode on the scan tool: Instrument Cluster DataLogger.
Select the instrument cluster speedometer active command. Trigger the speedometer and scroll in increments of
10% while monitoring the speedometer. The speedometer should increase in increments of approximately 19 km/h
(12 mph) (4.0L engine), or 23 km/h (14 mph) (4.6L engine) for each 10% change.
Does the speedometer begin at 0 and increase within specifications?
AE7 CHECK THE PCM VEHICLE SPEED SENSOR (VSS) PID
Enter the following diagnostic mode on the scan tool: PCM DataLogger.
Select the PCM vehicle speed (VSS) PID and monitor the PID while driving the vehicle at 32 km/h (20 mph), 64
km/h (40 mph) and 97 km/h (60 mph).
Does the speedometer indicate between 31-34 km/h (19-21 mph), 63-69 km/h (39-43 mph) and 93-103 km/h
(58-64 mph) at the 3 PCM PID values?
AE8 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION
Disconnect the instrument cluster connector.
Check for:
corrosion
pushed-out pins
Connect the instrument cluster connector and make sure it seats correctly.
Operate the system and verify the concern is still present.
Is the concern still present?
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No
GO to AE5.
Yes
GO to AE6.
No
GO to AE8.
Yes
GO to AE7.
No
GO to AE8.
Yes
The speedometer is operating correctly at this time.
No
GO to AE8.
Yes
INSTALL a new instrument cluster. REFER to
Instrument Cluster (IC) in this section. TEST the
system for normal operation.
No
The system is operating correctly at this time. The
concern may have been caused by a loose or
corroded connector.
11/14/2009