P1791

Test 1 Through 2:

Test 3 Through 7:

SYMPTOM:
P1791-LOSS OF PRIME

When Monitored and Set Condition:
P1791-LOSS OF PRIME

When Monitored:
If the transmission is slipping in any forward gear and the pressure switches are not indicating pressure, a loss of prime test is run.

Set Condition:
If the trans. begins to slip in a forward gear & the press. switch(s) that should be closed are open a loss of prime test begins. Available elements are turned on by the TCM to see if pump prime exists. The code sets if no pressure switches respond.

POSSIBLE CAUSES
INCORRECT FLUID LEVEL
INTERMITTENT OPERATION
INVALID PRNDL CODE
PLUGGED FILTER
REPLACE OIL PUMP