Toyota 1 MZ–FE Manual page 593

INSPECTION PROCEDURE
TOYOTA hand–held tester
Connect the TOYOTA hand–held tester and check operation of air
conditioning cut control.
Check for open and short in harness and connector between ECM
and A/C amplifier (See page IN–31).
Check voltage between terminal ACT of ECM and body ground.
Check and replace ECM (See page IN–36).
1MZ–FE ENGINE – CIRCUIT INSPECTION
(1) Remove the fuse cover on the instrument
panel.
(2) Connect the TOYOTA hand–held tester to the
DLC3.
(3) Turn ignition switch ON and TOYOTA hand–
held tester main switch ON.
(4) Start the engine and air conditioning switch
ON.
HINT: A/C magnet clutch is turned ON.
(5) Select the active test mode on the TOYOTA
hand–held tester.
Check operation of A/C magnet clutch cut when
air conditioning cut control is operated by the
TOYOTA hand–held tester.
A/C magnet clutch is turned OFF.
Proceed to next circuit inspection shown
on matrix chart (See page EG2–435).
Repair or replace harness or connector.
(1) Remove glove compartment
(See page EG2–309).
(2) Start the engine.
Measure voltage between terminal ACT of ECM
connector and body ground when A/C switch is
turned to ON and OFF.
A/C switch condition
Check and replace A/C amplifier.
4.5 – 5.5 V
OFF
EG2–593
Voltage
0 –2 V