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P1751-TRANSMISSION THROTTLE VALVE POSITION MINIMUM RANGE PERFORMANCE (CONTINUED) 2. 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 3 3. 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. Is the TTVA position between 3 and 26 degrees after completion of the autozero test? Yes >> Go To 5 No >> Go To 4 4. CHECK THE TRANSMISSION THROTTLE VALVE Turn the ignition off to the lock position. Remove the TTVA from the transmission per the Service Information. Properly support the TTVA and reconnect the TTVA wiring harness. Like in the previous step, with the scan tool, monitor the TTVA position during the autozero test. Ignition on, engine not running. Is the TTVA position between 3 and 26 degrees after completion of the autozero test? Yes >> Repair internal transmission as necessary. Refer to the Service Information for proper repair procedures for components related to the Transmission Throttle Valve. Perform RE TRANSMISSION VERIFICATION TEST VER - 1 (DIESEL). (Refer to 8 - ELECTRICAL/ No >> Replace the TTVA per the Service Information. Perform RE TRANSMISSION VERIFICATION TEST VER - 1 (DIESEL). (Refer to 8 - ELECTRICAL/ 21 - 900 AUTOMATIC TRANSMISSION - 48RE - DIESEL - ELECTRICAL DIAGNOSTICS DR/DH |