Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2001 Ford Explorer ChassisFACTORY OEM SERVICE PROCEDURE
Self-Diagnostic System
NOTE:
For further information of self-diagnostic system, see
MODULE COMMUNICATIONS NETWORK - EXPLORER & MOUNTAINEER article.
- For preliminary testing, see TROUBLE SHOOTING . If problem is not found, check Generic Electronic Module (GEM) for Diagnostic Trouble Codes (DTCs). Connect New Generation Star (NGS) tester, or equivalent scan tool, to Data Link Connector (DLC) located below center of instrument panel. Using NGS tester, perform DATA LINK DIAGNOSTIC TEST. If NGS tester displays CKT914, CKT915 or CKT70 = ALL ECUS NO RESP/NOT EQUIP, see MODULE COMMUNICATIONS NETWORK - EXPLORER & MOUNTAINEER article to diagnose network concern. If NGS tester displays NO RESP/NOT EQUIP for GEM, perform TEST J: NO COMMUNICATION WITH GEM under SYSTEM TESTS.
- If NGS tester displays SYSTEM PASSED, retrieve and record continuous DTCs. Erase continuous DTCs. Using NGS tester, perform GEM self-test. If GEM DTCs related to the concern are retrieved, see GENERIC ELECTRONIC MODULE DIAGNOSTIC TROUBLE CODE TEST INDEX table to continue diagnosis. If no DTCs related to the concern are retrieved, diagnose by symptom. See SYMPTOM INDEX table under SYSTEM TESTS. For GEM DTCs not covered in this article, see MODULE COMMUNICATIONS NETWORK - EXPLORER & MOUNTAINEER article.
GENERIC ELECTRONIC MODULE DIAGNOSTIC TROUBLE CODE TEST INDEX
| DTC (1) | Description | Perform Test | ||||||
|---|---|---|---|---|---|---|---|---|
| B1302 | Accessory Delay Relay Coil Circuit Failure | A | ||||||
| B1304 | Accessory Delay Relay Coil Circuit Open Or Short To Voltage | A | ||||||
| B1313 | Battery Saver Relay Coil Circuit Failure | A | ||||||
| B1315 | Battery Saver Relay Coil Circuit Short To Voltage | A | ||||||
| B1342 | GEM Defective | (2) | ||||||
| B1398 | Power Window One-Touch Down Relay Circuit Failure | (3) | ||||||
| B1400 | Power Window One-Touch Down Relay Coil Circuit Short To Voltage | (3) | ||||||
| B1404 | Driver's Door Power Window Down Circuit Open | (3) | ||||||
| B1405 | Driver's Door Power Window Down Circuit Short To Power | (3) | ||||||
| B1410 | Driver's Door Power Window Motor Circuit Failure | (3) | ||||||
| B1475 | Accessory Delay Relay Contacts Short To Voltage | (3) | ||||||
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Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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