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On Board Diagnostic Logic DTC NO. DTC DEFINITION DTC DETECTION CONDITION DTC SET CONDITION POSSIBLE CAUSES P1928 Shift lock solenoid valve short to ground Ignition switch on or vehicle is driving The Transaxle Control Module • Shift lock • Harness or • Transaxle DTC Confirmation Procedure: Before performing the following procedure, confirm that battery voltage is more than 12 V. • Connect the X-431 scan tool to the Data Link Connector (DLC) - use the most current software available. • Turn ignition switch on, with the scan tool, view and erase stored DTCs in the TCM. • Start the engine and warm it to normal operating temperature. • Try to operate the shifter selector. • With the scan tool, select view DTC and data stream. • If the DTC is detected, the DTC condition is current. Go to Diagnostic Procedure - Step 1. • If the DTC is not detected, the DTC condition is intermittent (See Diagnostic Help and Intermittent DTC Trou- bleshooting in Section 08 Transaxle & Transfer Case for more information). • If using the appropriate diagnostic test tool, you can diagnose the TCM harness while the TCM is still con- nected. • Using the appropriate diagnostic test tool in this way will help prevent electrical connector terminal damage. NOTE : Diagnostic Procedure 1. CHECK SHIFT LOCK SOLENOID VALVE SIGNAL • With the scan tool, select view DTC and data stream for A/T. • Start the engine. • Monitor the value of the gear position as indicated in the following table while driving: SELECT POSITION RANGE SHIFT SOLENOID VALVE 1 SHIFT SOLENOID VALVE 2 SHIFT SOLENOID VALVE 3 SHIFT SOLENOID VALVE 4 P 0 - - # - R R - - - - N 0 - - # - D 1 - - # # 2 - # - # 3 - - - - 4 # # - - DIAGNOSIS & TESTING
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