Self-Diagnostic System

NOTE: Refer to appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE for further instructions on retrieving and clearing DTCs.

For preliminary testing, see TROUBLE SHOOTING . If problem is not found, 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. See DATA LINK DIAGNOSTIC TEST under SELF-DIAGNOSTIC SYSTEM in MODULE COMMUNICATIONS NETWORK -- EXCURSION & F250-F550 SUPER DUTY PICKUPS article. If NGS tester displays CKT914, CKT915 or CKT70 = ALL ECUS NO RESP/NOT EQUIP, repair module communications concern. See MODULE COMMUNICATIONS NETWORK -- EXCURSION & F250-F550 SUPER DUTY PICKUPS article. If NGS tester displays NO RESP/NOT EQUIP for Generic Electronic Module (GEM), perform TEST A: NO COMMUNICATION WITH GENERIC ELECTRONIC MODULE under SYSTEM TESTS.

If NGS tester displays SYSTEM PASSED, retrieve and record continuous Diagnostic Trouble Codes (DTCs). Erase continuous DTCs. Using NGS tester, perform GEM self-test. If GEM DTCs related to the concern are retrieved, perform appropriate test. See GEM DTC TEST INDEX table. If no DTCs related to the concern are retrieved, perform appropriate test based on symptom. See SYMPTOM INDEX table under SYSTEM TESTS. For GEM DTCs not covered in this article, see MODULE COMMUNICATIONS NETWORK -- EXCURSION & F250-F550 SUPER DUTY PICKUPS article.

GEM DTC TEST INDEX

DTC ⁽¹⁾

Description

Perform Test

B1243

One-Touch Down Switch Circuit Short To Power

B1302

Accessory Delay Relay Coil Circuit Failure

B1304

Accessory Delay Relay Coil Circuit Short To Power

B1342

ECU Defective

⁽²⁾

B1398

One-Touch Down Relay Circuit Failure

B1400

One-Touch Down Relay Short To Power

B1405

Driver-Side Window Down Circuit Short To Power

B1410

Driver-Side Window Motor Circuit Failure

B1475

Accessory Delay Relay Contact Short To Power

B2357

Driver-Side Window Down Current Sense Failure

⁽¹⁾	Codes listed in this table are only for testing covered in this article. For complete DTC listing, see MODULE COMMUNICATIONS NETWORK -- EXCURSION & F250-F550 SUPER DUTY PICKUPS article.

⁽²⁾	Replace Generic Electronic Module (GEM). See GENERIC ELECTRONIC MODULE under REMOVAL & INSTALLATION.