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Diagnostic Procedure

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NOTE: Perform preliminary inspection before starting diagnostic procedure. See PRELIMINARY INSPECTION  under TROUBLE SHOOTING.
NOTE: In addition to transmission DTCs, engine-related DTCs may also be present. These DTCs must be repaired first as engine performance will greatly affect transmission operation. For information and testing procedures of engine-related DTCs and components, see appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.
  1. Perform RETRIEVING DIAGNOSTIC TROUBLE CODES (QUICK TEST) . If any engine-related DTCs are set, repair them first. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. Record and repair all KOEO and KOER DTCs. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . Once DTCs are repaired, go to next step. If no KOEO and KOER DTCs are set, go to step  4.
  2. Check for continuous memory DTCs. If any continuous memory DTCs were set, clear all DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES . Perform TRANSMISSION DRIVE CYCLE TEST . If continuous memory DTCs are set during drive cycle, go to next step. If continuous memory DTCs are not set during drive cycle, go to step  4.
  3. Perform diagnostic test corresponding to DTC set. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If problem is not corrected, go to next step. If problem is corrected, go to step  7.
  4. Diagnose problem by symptom. See SYMPTOM DIAGNOSIS (ELECTRONIC)  under TROUBLE SHOOTING. If electronic trouble symptoms exist, perform OUTPUT STATE CONTROL MODES , then go to next step. If no electronic trouble symptoms exist, go to step  6.
  5. Follow diagnostic tests corresponding to electronic trouble symptom. Perform static and drive tests. Use manufacturer provided transmission tester overlay to perform static tests. Follow tester manufacturer's instructions. If drive tests do not correct problem, go to next step. If drive tests correct problem, PCM, vehicle wiring harness and/or external inputs (sensors, switches, etc.) could be cause of problem. Diagnosis possible intermittent problem using appropriate scan tool and transmission tester. See TEST Z: INTERMITTENT in appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.
  6. Diagnose problem by mechanical symptom. See SYMPTOM DIAGNOSIS (MECHANICAL)  under TROUBLE SHOOTING. Perform any recommended overhaul procedures. Perform TRANSMISSION DRIVE CYCLE TEST .
  7. Perform RETRIEVING DIAGNOSTIC TROUBLE CODES (QUICK TEST)  and ensure no DTCs and no mechanical problems exist. If any DTCs exist, return to step  1. If no DTCs exist, clear memory code. See CLEARING DIAGNOSTIC TROUBLE CODES .
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