Pinpoint Test D: Incorrect Voltage Gauge Indication; Pinpoint Test E: The Tachometer Is Inoperative - Ford Mustang 2005 Workshop Manual

2005 Mustang Workshop Manual
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 D: Incorrect Voltage Gauge Indication

Normal Operation
The voltage gauge displays the system battery voltage as measured at the instrument cluster RUN input circuit.
Possible Causes
powertrain control module (PCM)
instrument cluster
PINPOINT TEST D: INCORRECT VOLTAGE GAUGE INDICATION
D1 CARRY OUT THE INSTRUMENT CLUSTER VOLTMETER 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 voltmeter active command. Trigger, monitor, and scroll
the voltmeter in 2 increments 0%, and 100%.
Does the voltmeter start at L (low) when at 0%, and move to H (high) at 100%?
D2 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?

Pinpoint Test E: The Tachometer Is Inoperative

Normal Operation
Engine rpm data is provided to the instrument cluster by the powertrain control module (PCM) through the communication network.
Possible Causes
PCM
instrument cluster
PINPOINT TEST E: THE TACHOMETER IS INOPERATIVE
E1 CARRY OUT THE INSTRUMENT CLUSTER TACHOMETER 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 tachometer active command. Trigger the tachometer and scroll in increments of 10%
while monitoring the tachometer. The tachometer should increase in increments of approximately 700 rpm (4.0L
engine), or 800 rpm (4.6L engine) for each 10% change.
Did the tachometer gauge increase within specifications?
E2 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?
E3 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?
Pinpoint Test F: The Low Fuel Warning Indicator Is Never/Always On
Normal Operation
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Test Step
Test Step
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 Pinpoint Test A to continue diagnosis of the RUN input circuit.
No
GO to D2.
Yes
INSTALL a new instrument cluster. 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.
Result / Action to Take
Yes
GO to E2.
No
GO to E3.
Yes
INSTALL a new PCM. REFER to
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)
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 19 of 40
Instrument Cluster (IC) in this
Section 303-14.
in this section. TEST the
11/14/2009