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.
SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSMERCURY1998MOUNTAINEER 5.0 P, AWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 25 (MODULE COMMUNICATIONS NETWORK (F150 & F250 LD))TESTINGTEST C: GENERIC ELECTRONIC MODULE (GEM) DOES NOT RESPOND TO NGS
1998 Mercury Mountaineer 5.0 P, AWD
Test C: Generic Electronic Module (Gem) Does Not Respond To NGS
1998 Mercury Mountaineer 5.0 P, AWDSECTION Test C: Generic Electronic Module (Gem) Does Not Respond To NGS
WARNING: This page is about a different car, the 1997 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.
- Turn ignition off. Disconnect 26-pin GEM connector C239 (below driver's side of instrument panel, to left of steering column). Inspect 26-pin GEM connector C239 and DLC for damage. If 26-pin GEM connector C239 and DLC are okay, go to next step. If 26-pin GEM connector C239 or DLC is damaged, repair as necessary. Retest system for normal operation.
- Using DVOM, check resistance of Light Blue/White wire between 26-pin GEM connector C239 pin No. 25 and DLC pin No. 7. See Figure and Fig 1. If resistance is less than 5 ohms, replace GEM. If resistance is 5 ohms or more, repair Light Blue/White wire between 26-pin GEM connector C239 and DLC. Retest system for normal operation.
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.