P0720

Test 1 Through 3:

Test 4 Through 5:

Symptom:
P0720-OUTPUT SPEED SENSOR ERROR

When Monitored and Set Condition:
P0720-OUTPUT SPEED SENSOR ERROR

When Monitored:
Continuously when the transmission is in gear.

Set Condition:
Upon detection of a speed sensor error the code sets as a one trip fault and will take 5 mins of substituted operation before the transmission is in LIMP-IN. The code sets if there is an extensive change in input RPM in any gear.

POSSIBLE CAUSES
CHECKING SYMPTOMS AND POSSIBLE CAUSES
LOW BATTERY VOLTAGE CAUSING SYMPTOM
INTERMITTENT CODE P0720

Test 1 Through 5:

Test 6 Through 9:

Test 10 Through 15:

Test 16 Through 19:

Test 20 Through 24:

Test 25 Through 26:

Symptom List:
ADDITIONAL INPUT SPEED SENSOR (P0715)
ADDITIONAL OUTPUT SPEED SENSOR (P0720)

Test Note: All symptoms listed above are diagnosed using the same tests. The title for the tests will be ADDITIONAL INPUT SPEED SENSOR (P0715).

POSSIBLE CAUSES
INPUT SPEED SENSOR GROUND CIRCUIT OPEN
OUTPUT SPEED SENSOR GROUND CIRCUIT OPEN
IGNITION WIRING DAMAGED
BOTH INPUT AND OUTPUT SPEEDS = 0 IN OD WITH BRAKES ON
INPUT SPEED SENSOR SIGNAL CIRCUIT SHORTED GND WITH ISS DISCONNECTED
OUTPUT SPEED SENSOR CIRCUIT OPEN
INPUT SPEED SENSOR SIGNAL CIRCUIT OPEN
OUTPUT SPEED SENSOR SIGNAL CIRCUIT SHORTED TO GND
SENSOR GROUND CIRCUIT OPEN
SPEED SENSOR GND CKT SHORTED TO BATTERY
SPEED SENSOR GROUND CIRCUIT HAS VOLTAGE
TRS SPEED SENSOR GND SHORTED TO BATTERY (OUTPUT)
TRS SPEED SENSOR GROUND SHORTED TO BATTERY (INPUT)
INPUT SPEED SENSOR DAMAGED
INPUT SPEED SENSOR DISCONNECTED
INPUT SPEED SENSOR SHORTED TO GROUND
OUTPUT SPEED SENSOR DAMAGED
OUTPUT SPEED SENSOR SHORTED TO GND
TCM GROUND CIRCUIT OPEN
TCM I114PUT SPEED SENSE FAULTY
INPUT SPEED SENSOR SHORTED TO GROUND AT TCM
OUTPUT SPEED SENSOR DISCONNECTED
OUTPUT SPEED SENSOR SHORTED TO GROUND AT TCM
TCM OUTPUT SPEED SENSE FAULTY
TCM SPEED SENSOR GND SHORTED TO BATTERY