Pinpoint Test I: The O/D Off Indicator Is Never/Always On - Ford Mustang 2005 Workshop Manual

2005 Mustang Workshop Manual
Ignition ON.
Measure the voltage between the instrument cluster C220-23, circuit 1083 (LB/PK), harness side and
ground.
Is any voltage present?
H4 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?
H5 CHECK FOR CORRECT RCM OPERATION
Disconnect all the RCM connectors.
Check for:
corrosion
pushed-out pins
Connect all the RCM connectors and make sure they seat correctly.
Operate the system and verify the concern is still present.
Is the concern still present?

Pinpoint Test I: The O/D Off Indicator Is Never/Always On

Normal Operation
The overdrive (O/D) off function is controlled by the O/D off switch located on the shifter assembly. The O/D off status is transmitted to the instrument cluster from the powertrain control
module (PCM) over the communication network.
Possible Causes
PCM
instrument cluster
PINPOINT TEST I: THE O/D OFF INDICATOR IS NEVER/ALWAYS ON
I1 CARRY OUT THE INSTRUMENT CLUSTER WARNING LAMPS AND CHIME ACTIVE
COMMAND USING THE DIAGNOSTIC TOOL
Ignition ON.
Enter the following diagnostic mode on the scan tool: Instrument Cluster Active Command.
Select the instrument cluster warning lamps and chime active command. Trigger the all warning
lamps active command on and off. Observe the O/D OFF indicator.
Does the O/D OFF indicator illuminate when triggered on and turn off when triggered off?
I2 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?
I3 CHECK FOR CORRECT POWERTRAIN CONTROL MODULE (PCM) OPERATION
Disconnect all the PCM connectors.
Check for:
corrosion
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?
Pinpoint Test J: The Check Fuel Cap Warning Indicator Is Never/Always On
Normal Operation
The powertrain control module (PCM) monitors the fuel tank evaporative emission system for significant leaks that occur following refueling of the vehicle. If a fuel tank pressure change
greater than -23.7 kPa (-7 in Hg) of vacuum within 30 seconds after refueling occurs, or there is an excessive purge (fuel vapor) flow of greater than 454 g (1 lb) per minute, the PCM sets
DTC P0457 and sends a message to the instrument cluster over the communication network to illuminate the check fuel cap warning indicator.
Possible Causes
PCM
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Test Step
Yes
REPAIR the circuit. ACTIVATE the SRS. REFER to
501-20B. TEST the system for normal operation.
No
GO to H4.
Yes
INSTALL a new instrument cluster. REFER to
Cluster (IC) in this section. ACTIVATE the SRS. REFER to
Section 501-20B. 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.
ACTIVATE the SRS. REFER to Section
Yes
INSTALL a new RCM. REFER to
ACTIVATE the SRS. REFER to Section
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.
ACTIVATE the SRS. REFER to Section
Result / Action to Take
Yes
GO to I3.
No
GO to I2.
Yes
INSTALL a new instrument cluster. REFER to
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.
Yes
INSTALL a new PCM. REFER to Section 303-14. 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.
Page 22 of 40
Section
Instrument
501-20B.
Section 501-20B.
501-20B. TEST the
501-20B.
Instrument Cluster (IC) in
11/14/2009