Toyota 1 MZ–FE Manual page 417

1MZ–FE ENGINE – CHECK FOR INTERMITTENT PROBLEMS
CHECK FOR INTERMITTENT
PROBLEMS
TOYOTA HAND–HELD TESTER only
By putting the vehicle's ECM in check mode, 1 trip detection
logic is possible instead of 2 trip detection logic and sensitivity
to detect open circuits is increased. This makes it easier to
detect intermittent problems.
CLEAR DIAGNOSTIC TROUBLE CODES
See page EG2–403
SET CHECK MODE
See page EG2–403
PERFORM A SIMULATION TEST
Using the symptom simulation (see page IN–24), shake and
pull lightly on the wire harness, connector or terminals in the
circuit indicated by the malfunction code. In this test, if the
malfunction indicator lamp lights up, it indicates that the place
where the wire harness, connector or terminals being pulled or
shake has faulty contact. Check that point for loose connec–
tions, dirt on the terminals, poor fit or other problems and
repair as necessary.
HINT: After cancelling out the diagnostic trouble code in
memory and setting the check mode, if the malfunction indi–
cator lamp does not go off after the engine is started, check
thoroughly for faulty contacts, etc., then try the check again.
If the malfunction indicator lamp still does not go off, check
and replace the ECM.
EG2–417