P1787

Test 1 Through 5:

Test 6 Through 10:

Test 11 Through 15:

Test 16 Through 19:

Test 20 Through 21:

Symptom:
P1787-OD HYDRAULIC PRESSURE TEST FAILURE

When Monitored and Set Condition
P1787-OD HYDRAULIC PRESSURE TEST FAILURE

When Monitored:In any forward gear with engine speed above 1000 RPM shortly after a shift and every minute thereafter.

Set Condition: After a shift into a forward gear, with engine speed > 1000 RPM, the TCM momentarily turns on element pressure to the clutch ckts that don't have pressure to identify the correct pressure sw closes. If the pressure sw does not close 2 times the code sets

POSSIBLE CAUSES
INTERMITTENT WIRING & CONNECTORS
INCORRECT FLUID LEVEL
POOR LPS CONNECTION
RELATED SPEED RATIO AND/OR PRESSURE SWITCH DTC'S PRESENT
OD PRESSURE SWITCH SENSE CIRCUIT OPEN
OD PRESSURE SWITCH SENSE CIRCUIT SHORT TO GROUND
LINE PRESSURE SENSOR
5-VOLT SUPPLY CIRCUIT OPEN
RELATED LINE PRESSURE DTC'S PRESENT
5-VOLT SUPPLY CIRCUIT SHORT TO GROUND
OD PRESSURE SWITCH SENSE CIRCUIT SHORT TO VOLTAGE
TRANSMISSION RELAY OUTPUT CIRCUIT OPEN
TCM (NO 5 VOLTS LOW LINE PRESSURE SENSOR)
EXCESSIVE DEBRIS IN OIL PAN
INTERNAL TRANSMISSION PROBLEM - OD PRESSURE TEST
TCM (OD PRESSURE SWITCH)