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.
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HOMESERVICE MANUALSMERCURY1998MOUNTAINEER 5.0 P, AWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 20 (MODULE COMMUNICATIONS NETWORK)COMMUNICATION NETWORK DIAGNOSTICSDATA LINK DIAGNOSTICS
1998 Mercury Mountaineer 5.0 P, AWD
Data Link Diagnostics
1998 Mercury Mountaineer 5.0 P, AWDSECTION Data Link Diagnostics
WARNING: This page is about a different car, the 1997 Ford RV Cutaway, 1997 Ford Econoline, 1997 Ford Cutaway, and 1997 Ford Club Wagon. However, it is still accessible from the selected car via links, so may be relevant.
- Connect New Generation Star (NGS) scan tester on Data Link Connector (DLC) and perform proper hook-up procedure. See EQUIPMENT HOOK-UP .
- Turn ignition switch to ON position. Rotate dial on scan tester to menu item DIAGNOSTIC DATA LINK and press trigger. A test will be performed on the BUS (circuits No. 914 and 915) for the module communications network and the ISO 9141 communication link circuit No. 70. This is the Light Blue/White wire that goes between terminal No. 7 on DLC and 4-Wheel Anti-lock Brake (4WABS) module and air bag diagnostic monitor (also referred to as Electronic Crash Sensor (ECS) module).
- If scan tester displays CKT 914 (+) = SYSTEM PASSED and CKT 915 (-) = SYSTEM PASSED, module communications network is okay. If scan tester displays CKT 70 = SYSTEM PASSED, ISO 9141 communication link is operating properly.
- If scan tester displays ABS NO RESPONSE/NOT EQUIPPED, go to TEST A: 4-WHEEL ANTI-LOCK CONTROL SYSTEM DOES NOT RESPOND TO NGS under TESTING .
- If scan tester displays AIR BAG NO RESPONSE/NOT EQUIPPED, go to TEST B: AIR BAG DIAGNOSTIC MONITOR/ELECTRONIC CRASH SENSOR (ECS) DOES NOT RESPOND TO NGS under TESTING .
- If scan tester displays CKT 914 (+) = 00000001 and CKT 915(-) = 00000001, go to TEST C: POWERTRAIN CONTROL MODULE (PCM) DOES NOT RESPOND TO NGS under TESTING .
- If scan tester displays CKT 70 = 0000000F, go to TEST D: NO MODULE/NETWORK COMMUNICATION.
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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.