Ford Mustang (1999-2004) Service Manual: Inspection and Verification
NOTE: Upon installation of a new GEM, the module must be reconfigured. For additional information, refer to Section.
1. The warning lamps are a GEM controlled system; refer to Section.
2. Verify the customer concern by operating the system in question.
3. Visually inspect for the following obvious signs of mechanical and electrical damage.
Visual Inspection Chart
Mechanical | Electrical |
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4. If the concern remains after the inspection, connect the diagnostic tool to the data link connector (DLC) located beneath the instrument panel and select the vehicle to be tested from the diagnostic tool menu. If the diagnostic tool does not communicate with the vehicle:
- check that the program card is correctly installed.
- check the connections to the vehicle.
- check the ignition switch position.
5. If the diagnostic tool still does not communicate with the vehicle, refer to the diagnostic tool manual.
6. Carry out the Data Link Diagnostic Test. If the diagnostic tool responds with:
- CKT914, CKT915 or CKT70 = ALL ECUS NO RESP/NOT EQUIP, refer to Section.
- NO RESP/NOT EQUIP for GEM, go to Pinpoint Test A.
- NO RESP/NOT EQUIP for RCM, refer to Section.
- SYSTEM PASSED, retrieve and record the continuous diagnostic trouble codes (DTCs), erase the continuous DTCs and carry out self-test diagnostics for the GEM.
7. If the DTCs retrieved are related to the concern, go to the GEM Diagnostic Trouble Code (DTC) Index to continue diagnostics.
8. If no DTCs related to the concern are retrieved, proceed to the Symptom Chart to continue diagnostics.
9. If the DTCs retrieved are for the RCM, refer to Section.
GEM Diagnostic Trouble Code (DTC) Index
DTC | Description | Source | Action |
B1340 | Chime Input Request Circuit Short to Ground | GEM | Go To Pinpoint Test C . |
B1342 | ECU Is Defective | GEM | CLEAR the DTCs. TEST the
system for normal operation.
RETRIEVE the DTCs. If DTC B1342 is retrieved, INSTALL a new GEM. |
B1353 | Ignition Key-In Circuit Open | GEM | Go To Pinpoint Test B . |
B1462 | Safety Belt Switch Circuit Failure | GEM | Go To Pinpoint Test F . |
Symptom Chart
Condition | Possible Sources | Action |
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Principles of Operation
Key-In-Ignition Warning Chime
The key-in-ignition warning chime activates when the generic
electronic module (GEM) detects the
ignition switch circuits are in the OFF or ACC states and when the ...
Pinpoint Tests
CAUTION: Before removing and installing the generic electronic
module (GEM) or its
connectors, disconnect the battery. Failure to follow this caution will
result in the GEM storing
many erro ...
Other materials:
Daytime running lamps
WARNING: Always remember to turn on your headlamps at
dusk or during inclement weather. The Daytime Running Lamp
(DRL) system does not activate the tail lamps and generally may not
provide adequate lighting during these conditions. Failure to activate
your hea ...
Installation
1. Inspect the pinion flange seal journal for rust, nicks, and scratches
prior to installing the flange.
Polish the seal journal with fine crocus cloth, if necessary.
2. Lubricate the pinion flange splines.
Use SAE 80W-90 Premium Rear Axle Lubricant XY-80 ...
Lamp Assembly - Headlamp
Removal
1. NOTE: Make sure that the headlamp switch and the ignition switch are
in the OFF position.
Raise the headlamp retainers.
2. Remove the headlamp assembly.
Disconnect the electrical connectors and replace the lamp if
necessary.
Instal ...