P1787

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 above 1000 RPM, the TCM momentarily turns on element pressure to the clutch circuits that don't have pressure to identify the correct pressure switch closes. If the pressure switch does not close 2 times the DTC sets.

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