P1781

Test 1 Through 2:

Test 3 Through 7:

Test 8 Through 10:

Test 11 Through 13:

Test 14 Through 16:

Test 17 Through 18:

Symptom:
P1781-OD PRESSURE SWITCH SENSE CIRCUIT

When Monitored and Set Condition:
P1781-OD PRESSURE SWITCH SENSE CIRCUIT

When Monitored:
Whenever the engine is running. Engine speed must be greater than 500 rpm. A shift must not be in progress, and there must be more than 2.0 seconds since start-up. No loss of prime test in progress, and a pressure switch mismatch.

Set Condition:
The code sets if the Overdrive (OD) pressure switch is open or closed at the wrong time in a given gear.

POSSIBLE CAUSES
CHECKING SYMPTOMS AND POSSIBLE CAUSES
LOW BATTERY VOLTAGE
OD PRES SW CKT OPEN BETWEEN SOLENOID PACK & TCM
OD PRESS SWITCH SENSE CKT SHORTED TO TCR OUTPUT CKT
OD PRESSURE SWITCH SENSE CIRCUIT OPEN
OD PRESSURE SWITCH SENSE CIRCUIT SHORTED TO GROUND
TCM OD PRESSURE SWITCH SENSE DEFECTIVE
TCM OD PRESSURE SWITCH SENSE INTERNAL SHORT TO GROUND
TRANSAXLE SEALS DEFECTIVE
OD PRESSURE SWITCH DEFECTIVE
OD SOLENOID DEFECTIVE
INTERMITTENT CODE P1781
ROAD TEST VEHICLE