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.
1998 Ford Ranger EVFACTORY OEM SERVICE PROCEDURE
Generic Electronic Module/Central Timer Module (Gem/CTM) DTC Definitions
ANTI-THEFT SYSTEMS (ACTIVE) DIAGNOSTIC TROUBLE CODE (DTC) LIST
| DTC | Source Module | Perform Test |
|---|---|---|
| B1340 | GEM/CTM | Test wiring for opens and/or shorts and repair as necessary. See appropriate WARNING SYSTEMS wiring diagram in SYSTEM WIRING DIAGRAMS article in the WIRING DIAGRAMS section. Chime Input Request Circuit Short To Ground |
| B1342 | GEM/CTM | Using NGS tester, clear DTCs. Retrieve DTCs. If DTC B1342 is retrieved, replace GEM/CTM and retest system operation. GEM/CTM Is Defective |
| B1352 | GEM/CTM | Test wiring for opens and/or shorts and repair as necessary. See appropriate WARNING SYSTEMS wiring diagram in SYSTEM WIRING DIAGRAMS article in the WIRING DIAGRAMS section. This DTC may also be present from GEM/CTM wiggle test. Ignition Key-In Circuit Failure |
| B1426 | GEM/CTM | This DTC may also be present from GEM/CTM wiggle test. Seat Belt Light Circuit Short To Battery |
| B1462 | GEM/CTM | Test wiring for opens and/or shorts and repair as necessary. See appropriate WARNING SYSTEMS wiring diagram in SYSTEM WIRING DIAGRAMS article in the WIRING DIAGRAMS section. This DTC may also be present from GEM/CTM wiggle test. Seat Belt Switch Circuit Failure |
| B1577 | GEM/CTM | Test wiring for opens and/or shorts and repair as necessary. See appropriate WARNING SYSTEMS wiring diagram in SYSTEM WIRING DIAGRAMS article in the WIRING DIAGRAMS section. This DTC may also be present from GEM/CTM wiggle test. Parking Light Input Circuit Short To Battery |
| B2141 | GEM/CTM | Vehicle speed calibration data is not programmed into GEM/CTM. Use NGS tester configuration card help screen to program tire size and axle ratio. Retest system operation. If DTC B2141 is still present, replace GEM/CTM and retest system operation. NVM Configuration Failure |
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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