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DIAGNOSIS AND TESTING PRE-DIAGNOSTIC CHECK OUT Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 21 - TRANSMIS- For a complete wiring diagram Refer to Section 8W. Diagnostic Test 1. PRE-DIAGNOSTIC CHECK OUT NOTE: Low fluid level can be the cause of many transmission problems. If the fluid level is low locate and NOTE: Always perform diagnostics with a fully charged battery to avoid false symptoms. With the scan tool, read Transmission DTC’s. Record all DTC’s and 1 Trip Failures. NOTE: Diagnose 1 Trip Failures as a fully matured DTC. Perform the Shift Lever Position Test. If the test does not pass, refer to Symptom test for P0706 Check Shifter For Gear Ratio DTC’s, check and record all CVI’s. Most DTC’s set on start up but some must be set by driving the vehicle to ensure that all diagnostic monitors have NOTE: Verify flash level of Powertrain Controller. Some problems are corrected by software upgrades to the NOTE: Due to the integration of the Powertrain and Transmission control modules - if a controller flash is NOTE: Check for applicable Service Bulletins that may apply. Were any repairs made that fixed the customer’s complaint? Yes >> Testing complete. No >> Refer to the diagnostic test procedure related to the DTC. 8E - 144 ELECTRONIC CONTROL MODULES - SERVICE INFORMATION DR/DH |