Ford Mustang 2005 Workshop Manual page 21

2005 Mustang Workshop Manual
G5 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 Active Command.
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?
G6 CHECK FOR CORRECT PCM OPERATION
Disconnect all the PCM connectors.
Check for:
corrosion
damaged pins
pushed-out pins
Connect all the PCM connectors and make sure they seat correctly.
Operate the system and verify the concern is still present.
Is the concern still present?
G7 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION
Disconnect the instrument cluster connector.
Check for:
corrosion
damaged pins
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?
Pinpoint Test H: The Safety Belt Warning Indicator Is Inoperative/Does Not Operate Correctly
Normal Operation
The safety belt switch is hardwired to the restraint control module (RCM). The instrument cluster receives the safety belt switch status from the RCM through circuit 1083 (LB/PK). The
RCM signals the instrument cluster, when the safety belt is unfastened, to illuminate the safety belt warning indicator. A Belt-Minder® chime that is operating correctly indicates the RCM
is monitoring and transmitting the correct operation of the safety belt status to the instrument cluster.
Possible Causes
RCM
instrument cluster
PINPOINT TEST H: THE SAFETY BELT WARNING INDICATOR IS INOPERATIVE/DOES NOT OPERATE CORRECTLY
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
H1 CHECK THE SAFETY BELT WARNING INDICATOR OPERATION
Deactivate the supplemental restraint system (SRS). Refer to
Ignition OFF.
Disconnect: Restraint Control Module (RCM) C2041a.
Connect a fused (10A) jumper wire between the RCM C2041a-22, circuit 1083 (LB/PK), harness side and
ground.
Observe the safety belt warning indicator with the jumper wire connected and disconnected.
Ignition ON.
Does the safety belt warning indicator lamp illuminate with the jumper wire disconnected and turn off
when it is connected?
H2 CHECK CIRCUIT 1083 (LB/PK) FOR AN OPEN OR A SHORT TO GROUND
Ignition OFF.
Disconnect: Instrument Cluster C220.
Measure the resistance between the instrument cluster C220-23, circuit 1083 (LB/PK), harness side and the
RCM C2041a-22, circuit 1083 (LB/PK), harness side; and between the instrument cluster C220-23, circuit
1083 (LB/PK), harness side and ground.
Is the resistance less than 5 ohms between the instrument cluster and the RCM, and greater than
10,000 ohms between the instrument cluster and ground?
H3 CHECK CIRCUIT 1083 (LB/PK) FOR A SHORT TO VOLTAGE
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Test Step
Section 501-20B.
Page 21 of 40
Yes
GO to G6.
No
GO to G7.
Yes
INSTALL a new PCM. REFER to 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.
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.
Result / Action to Take
Yes
GO to H5.
No
GO to H2.
Yes
GO to H3.
No
REPAIR the circuit. ACTIVATE the SRS. REFER to
501-20B. TEST the system for normal operation.
303-14.
Section
11/14/2009