P1784

Test 1 Through 3:

Test 4 Through 5:

Symptom:
P1784-L-R PRESSURE SWITCH CIRCUIT

When Monitored and Set Condition:
P1784-L-R PRESSURE SWITCH CIRCUIT

When Monitored:
Whenever the engine is running.

Set Condition:
The transmission uses pressures switches to monitor fluid pressure in L-R, 2-4, and O/D elements. The pressure switches are continuously monitored for correct states in each gear. If and error is detected the code will set.

POSSIBLE CAUSES
CHECKING SYMPTOMS AND POSSIBLE CAUSES
LOW BATTERY VOLTAGE
INTERMITTENT CODE P1784

Test 1 Through 3:

Test 4 Through 7:

Test 8 Through 11:

Test 12 Through 13:

Symptom:
ADDITIONAL L-R PRESSURE SWITCH CIRCUIT (P1784)

POSSIBLE CAUSES
TRANSAXLE DEFECTIVE
L-R PRESS SW SENSE CKT SHORTED TO TCR OUTPUT CKT
L-R PRESSURE SWITCH OPEN
L-R PRESSURE SWITCH SENSE CKT OPEN BETWEEN SOLENOID PACK AND TCM CONNECTORS
L-R PRESSURE SWITCH SENSE SHORTED TO GROUND
SOLENOID SWITCH VALVE STUCK IN LOCK UP POSITION
VALVE BODY BOLT TORQUES OUT OF SPECIFICATION
L-R PRESSURE SENSE DEFECTIVE
TCM L-R PRESSURE SENSE INTERNAL SHORT TO GROUND
L-R PRESSURE SWITCH DEFECTIVE
L-R SOLENOID DEFECTIVE(LOCK UP)
SOLENOID PACK CAUSING L-R PRESSURE SWITCH CIRCUIT CODE