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Diagnostic Aids

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

  1. 1) Check For Codes 23/121, 53/123 & 63/122

    Disconnect cruise control servo wiring harness connector (if equipped). Perform KOEO SELF-TEST. If Code 23/121, 53/123 or 63/122 is present, go to appropriate CIRCUIT TEST. See SERVICE CODE REFERENCE  CHARTS. If Code 11/111 (pass code) is displayed, go to next step. If no code is displayed, go to CIRCUIT TEST QA  .

  2. 2) Check Throttle Linkage

    Check throttle and linkage for sticking and binding. If throttle and linkage are okay, replace Throttle Position (TP) sensor and repeat QUICK TEST  . If throttle and linkage are binding, repair as necessary and repeat QUICK TEST.
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