coolant temperature FORD MUSTANG 2003 Repair Manual

z
air bag warning indicator
z BRAKE warning indicator
z charging system indicator
z fail safe cooling warning indicator
z low coolant level indicator
z low fuel warning indicator
z traction control indicator
Instrument Cluster Replacement
When it is necessary to install a new instrument cluster, contact the Instrument Cluster Program.
Gauge Indication Systems
Tachometer
Engine rpm information is relayed to the instrument cluster from the powertrain control module (PCM)
over the standard corporate protocol (SCP) network.
Speedometer
The instrument cluster receives the vehicle speed signal from the PCM over the SCP network and
displays it on the speedometer gauge. If the instrument cluster receives no vehicle speed signal after
one second, the speedometer defaults to 0.0 km/h (0.0 mph).
Odometer
The instrument cluster receives an odometer message from the PCM and stores the mileage in
memory. When the instrument cluster fails to receive the odometer message for more than two
seconds, the odometer will display dashes.
Fuel Gauge
The fuel sender is hardwired to the fuel gauge. When the instrument cluster fails to receive the fuel
level signal for more than 33 seconds, the fuel level gauge will move below E (empty). If the fuel level
signal operates correctly for more than 33 seconds, the fuel gauge will return to the correct position.
Fuel fills of less than 9.5 liters (2.5 gallons) require at least 10 minutes to update the fuel gauge
indication.
Engine Coolant Temperature Gauge
Engine coolant temperature information is received by the instrument cluster from the PCM over the
SCP network. Engine coolant temperatures above 121°C (250°F) will cause the gauge to indicate
above the normal band. If the engine coolant temperature information is missing or invalid for five
seconds, the temperature gauge will indicate below the cold (C) position.
Voltage Gauge (except Cobra)
The voltage gauge displays the system voltage as measured at the instrument cluster run input. Boost Gauge (Cobra only) Klj . 2 ba
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(20A).
z Battery junction
box (BJB) fuse
12 (40A).
z Circuitry.
z GEM.
z No communication with
the instrument cluster z
Central junction
box (CJB) fuse
(s):
„11
(15A).
„ 21 (5A).
„ 34
(20A).
z Circuitry.
z Standard
corporate
protocol (SCP)
network.
z Instrument
cluster. z
Go To Pinpoint Test A .
z Incorrect fuel gauge
indication z
Circuitry.
z Fuel pump
module.
z Instrument
cluster. z
Go To Pinpoint Test B .
z Incorrect oil pressure
gauge indication z
Circuitry.
z Engine oil
pressure
switch.
z Instrument
cluster. z
Go To Pinpoint Test C .
z Incorrect temperature
gauge indication z
Circuitry.
z Engine coolant
temperature
sensor.
z Powertrain
control module
(PCM).
z Instrument
cluster. z
Go To Pinpoint Test D .
z Incorrect voltage gauge
indication— except
Cobra z
Circuitry.
z Generator.
z Standard
corporate
protocol (SCP)
network.
z Instrument
cluster. z
Go To Pinpoint Test E .
z Incorrect tachometer
indication z
Standard
corporate
protocol (SCP)
network.
z Powertrain
control module
(PCM).
z Instrument
cluster. z
Go To Pinpoint Test F .
z Incorrect boost gauge zPressure line. zGo To Pinpoint Test G . Klj . 10 ba
412003 Mustang Workshop Manual
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PINPOINT TEST D: INCORRECT TEMPERATURE GAUGE
INDICATION
PINPOINT TEST E: INCORRECT VOLTAGE GAUGE INDICATION—
EXCEPT COBRA z
Check for:
zcorrosion
z pushed- out pins
z Connect all instrument cluster connectors and make sure they
seat correctly.
z Operate the system and verify the concern is still present.
z Is the concern still present? instrument cluster.
REFER to
Instrument Cluster in this section.
TEST the system for
normal operation.
No
The system is
operating correctly at
this time. Concern may
have been caused by a
loose or corroded
connector. CLEAR the
DTCs. REPEAT the
self- test. Test Step Result / Action to Take
D1 CARRY OUT THE INSTRUMENT CLUSTER
ENGINE COOLANT TEMPERATURE GAUGE
ACTIVE COMMAND z
Connect the diagnostic tool.
z Key in ON position.
z Enter the following diagnostic mode on the
diagnostic tool: Instrument Cluster Active
Command.
z Trigger instrument cluster active command
ENGCOOLNT. Monitor the engine coolant
temperature gauge while adjusting the
ENGCOOLNT active command to read 50%
and 100%.
z Does the temperature gauge start at cold,
move to half at 50%, and full hot at 100%? Yes
REFER to the Powertrain
Control/Emissions Diagnosis (PC/ED)
manual.
No
GO to
D2 .
D2 CHECK FOR CORRECT INSTRUMENT
CLUSTER OPERATION z
Disconnect all instrument cluster connectors.
z Check for:
zcorrosion
z pushed- out pins
z Connect all instrument cluster connectors and
make sure they seat correctly.
z Operate the system and verify the concern is
still present.
z Is the concern still present? Yes
INSTALL a new instrument cluster.
REFER to
Instrument Cluster in this
section. TEST the system for normal
operation.
No
The system is operating correctly at this
time. Concern may have been caused by
a loose or corroded connector. CLEAR the
DTCs. REPEAT the self-test. Test Step Result / Action to
Take E1 CHECK THE INSTRUMENT CLUSTER Klj . 19 ba
412003 Mustang Workshop Manual
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Camshaft Position (CMP) SensorEngine Performance
Central Control ModuleAnti-Theft System
ClockspringAir Bag Restraint System; Cruise Control
Systems; Steering Column Switches
Clutch Pedal Position SwitchStarters
Clutch Start SwitchStarters
Combination MeterAnalog Instrument Panels
Constant Control Relay Module (CCRM)Engine Performance; Electric Cooling Fans
Convenience CenterPower Distribution; Illu mination/Interior Lights
Convertible Top MotorPower Convertible Top
Convertible Top SwitchPower Convertible Top
Crankshaft Position (CKP) SensorEngine Performance
Cruise Control ModuleCruise Control Systems
Cruise Control SwitchCruise Control Systems
Condenser Fan Relay(s)Electric Cooling Fans
Data Link Connector (DLC)Engine Performance
Daytime Running Lights ModuleDaytime Running Lights; Exterior Lights
Defogger RelayRear Window Defogger
Diagnostic Energy Reserve Module (DERM)Air Bag Restraint System
Discriminating Sensor (Air Bag)Air Bag Restraint System
DistributorEngine Performance
Door Lock ActuatorsPower Door Locks; Remote Keyless Entry
Door Lock Relay(s)Power Door Locks
Electrochromic MirrorPower Mirrors
Electronic Level Control (ELC) Height SensorElectronic Suspension
Electronic Level Control (ELC) ModuleElectronic Suspension
Engine Coolant Temper ature (ECT) Sending UnitAnalog Instrument Panels
Engine Coolant Temperature (ECT) SensorEngine Performance
Engine Control ModuleEngine Performance; Ge nerators & Regulators;
Starters
ETACS ECUWarning Systems; Power Windows; Remote Keyless Entry
Evaporative (EVAP) Emissions CanisterEngine Performance
EVAP Canister Purge SolenoidEngine Performance
EVAP Canister Vent SolenoidEngine Performance
Exhaust Gas Recirculation (EGR) ValveEngine Performance
Fuel Tank Vacuum SensorEngine Performance
Fog LightsHeadlight Systems; Daytime Running Lights
Fog Light RelayHeadlight Systems; Daytime Running Lights
Fuel Door Release SolenoidPower Fuel Door Release
Fuel Gauge Sending UnitAnalog Instrument Panels
Fuel InjectorsEngine Performance
Fuel PumpEngine Performance
Fuel Pump RelayEngine Performance; Power Distribution


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