MAZDA/FORD GF4A-EL - HARSH UPSHIFTS (ELECTRICAL)
COMPLAINT: Vehicles equipped with GF4A-EL transmissions may exhibit harsh shifts, accompanied by a trouble code 56 or OBDII code P0710, Transmission Temperature Sensor Fault. NOTE: These trouble codes may or may not flash the M.I.L.
CAUSE: The cause may be, a faulty Transmission Temperature Sensor. WHY: Vehicles equipped with GF4A-EL transmissions have a computer strategy that commands line pressure to be maximum when fluid temperature is at or below 10°F. Therefore if the temperature sensor is faulty it may indicate that temperature is at or below 10°F at all times.
CORRECTION: Refer to Figure 1 for the location of the Transmission Oil Temperature Sensor. Refer to Figure 2 for the Ohm value and testing procedure to check the sensor. Refer to Figure 3 for the testing procedure of the sensor at the 10 pin connector. Repair or replace temperature sensor as necessary.
Transmission Oil Temperature Sensor (MAZDA)...................................... FU2B-19-012B
DIS-CONNECT 10 PIN CONNECTOR AND CONNECT OHM METER
TO TERMINALS 1 AND 6 TO VERIFY THAT RESISTANCE VALUES
MATCH THE TEMPRATURES LISTED ABOVE
BACK PROBE TERMINALS 1 AND 6, WITH 10 PIN CONNECTOR
CONNECTED, VOLT METER SET TO DC VOLTS, TO VERIFY VOLTAGE.
68°F (20°C) IS EQUAL TO APPROXIMATELY 3.5 VOLTS
266°F (130°C) IS EQUAL TO APPROXIMATELY 0.6 VOLTS