Pre-Diagnostic Checks

NOTE: Always perform the following procedures prior to diagnosing DTCs.

CAUTION: Do not probe PCM harness connectors. Probing PCM harness connectors will damage PCM terminals, resulting in poor terminal-to-pin connection. Always install Miller Special Tool (8815) to perform diagnosis at PCM harness connectors.

Check transmission fluid level and condition at normal operating temperature. Check transaxle for damage or leaks. Repair as necessary. Using scan tool, check for engine-related DTCs. Repair all engine-related DTCs prior to diagnosing transaxle malfunction. Using scan tool, check for transaxle DTCs. Repair all transaxle and one trip failure codes as necessary. Diagnose one trip failure codes as hard codes. Inspect wiring and connectors and repair as necessary. Using scan tool, perform SHIFT LEVER POSITION test. If test does not pass, see DTC P0706: CHECK SHIFTER SIGNAL . For gear ratio DTCs, record all Clutch Volume Index (CVI) information. CVI represents the volume of fluid needed to compress a clutch pack. PCM determines CVI's by monitoring time it takes for a gear change to occur. Most codes set at engine start up, but some codes must be set by driving vehicle.

NOTE: Verify flash level of PCM. Some problems are corrected by software upgrades to PCM. Check for applicable TSBs related to problem.