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P1754-TRANSMISSION THROTTLE VALVE ACTUATOR STUCK (CONTINUED) Diagnostic Test 1. CHECK IF THE DTC IS CURRENT Ignition on, engine not running. With the scan tool, read Engine DTCs. Record the Freeze Frame data for the reported DTC. With the scan tool, erase DTCs. Turn the ignition off to the lock position. Using the Freeze Frame data recorded earlier, try to duplicate the conditions in which the DTC originally set. NOTE: It may be necessary to road test the vehicle to duplicate the original set conditions. Did the DTC reset? Yes >> Go To 2 No >> Go To 16 2. CHECK THE TTVA POSITIONS WITH THE AUTO ZERO FEATURE NOTE: Each time the ignition is cycled to the on position, the ECM commands a TTVA internal calibration Ignition on, engine not running. After the autozero test is completed, record the position percentage value. Press and hold the accelerator pedal to full throttle after completion of the autozero test and record. Subtract the TTVA full throttle value from the value recorded after the autozero test. Is the difference between the two values greater than or equal to 48 degrees? Yes >> Go To 16 No >> Go To 3 3. CHECK TTVA FOR SIGNS OF DAMAGE Turn the ignition off to the lock position. Visually inspect the TTVA shaft for any signs of external damage or improperly mounted. NOTE: It is not necessary to remove the TTVA to perform this procedure. Is the TTVA damaged or improperly mounted? Yes >> Repair as necessary. Perform RE TRANSMISSION VERIFICATION TEST VER - 1 (DIESEL). (Refer to 8 - ELECTRICAL/ No >> Go To 4 21 - 912 AUTOMATIC TRANSMISSION - 48RE - DIESEL - ELECTRICAL DIAGNOSTICS DR/DH |