Intermittent Operation Of Generic Electronic Module (Gem) Functions
- Inspect fuse 19 (10 Amp). Check for loose or damaged connectors or wires. If a problem is found, service as necessary, then proceed to next step. If okay, go to next step.
- Connect New Generator Star (NGS) tester to Data Link Connector (DLC), and retrieve continuous DTC's. Perform On Demand self test. If DTC B1318 is present, go to next step. If DTC B1317 is not retrieved, go to step 4).
- Inspect ground stud for corrosion or loose connection that could cause excess resistance. Repair as necessary. If okay, repair charging system for under-voltage condition.
- Inspect GEM 26-pin connector terminals 13, (Black/Light Green wire), 25, (Black/White wire), and 26 (Black/White wire) for terminal looseness or damage. See Fig 1
. Repair as necessary. If okay, go to next step.
- Disconnect battery negative terminal. Check for intermittent continuity on Black/Light Green wire between fuse 19 and GEM connector J1 pin 13. See Fig 1
. If there intermittent continuity, repair intermittent open in Black/Light Green wire. If continuity is present, go to next step.
- Check GEM ground connection behind right side of instrument panel. If connection is okay, repair open in ground circuits (Black/White wire) between GEM and ground point behind right side of instrument panel. Grounds at GEM are located in 26-pin connector terminals 25 and 26, and 22-pin connector terminal 15. See Fig 1
.
Courtesy of FORD MOTOR CO.
Courtesy of FORD MOTOR CO.