Diagnostic Aids

WARNING: This page does not describe the selected car, but rather 15 other vehicles, including the 1992 Mercury Tracer, 1992 Mercury Topaz, 1992 Mercury Sable, 1992 Mercury Grand Marquis, and 1992 Mercury Cougar. However, it is still accessible from the selected car via links, so may be relevant.

Perform this circuit test when directed by other CIRCUIT TESTS. This test is only intended to diagnose:

ECA.
Throttle plate linkage.

1) Check For Codes 23, 53, 63, 121, 122 & 123 Disconnect cruise control servo wiring harness connector. Perform KOEO SELF-TEST . If Code 23, 53, 63, 121, 122 or 123 is present, go to appropriate CIRCUIT TEST. See SERVICE CODE REFERENCE CHARTS , and service codes as necessary. If Code 11/111 (pass code) is displayed, go to step 2). If no code is displayed, go to CIRCUIT TEST QA.

2) Check Throttle Linkage Check throttle and linkage for sticking and binding. If throttle and linkage are okay, replace Throttle Position Sensor (TPS) and repeat QUICK TEST . If throttle and linkage are binding, repair as necessary and repeat QUICK TEST.