P1788

P1788 - 2/4 HYDRAULIC PRESSURE TEST FAILURE

When Monitored and Set Condition:
P1788 - 2/4 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:
INCORRECT FLUID LEVEL
LOSS OF PRIME P1791 PRESENT
RELATED GEAR RATIO AND/OR PRESSURE SWITCH DTC'S PRESENT
INTERMITTENT WIRING & CONNECTORS
TRANSMISSION RELAY OUTPUT CIRCUIT OPEN
2-4 PRESSURE SWITCH SENSE CIRCUIT OPEN
2-4 PRESSURE SWITCH CIRCUIT SHORT TO GROUND
INTERNAL TRANSMISSION PROBLEM
2-4 PRESSURE SWITCH SENSE CIRCUIT SHORT TO VOLTAGE
TCM - 2-4 PRESSURE SWITCH SENSE