Page 2089 of 2543
INSPECTION PROCEDURE
(See page EG±510)
Check and repair harness or connector between
engine control module and EFI No.1 fuse, EFI No.1
fuse and battery.
Remove EFI No.1 fuse from R/B No.2.
Check continuity of EFI No.1 fuse.
Continuity
Check EFI No.1 Fuse.
Check voltage between terminal BATT of engine control module connector
and body ground.
Connect SST (check harness ªAº).
See page EG±510)
SST 09990±01000
Measure voltage between terminal BATT of en-
gine control module connector and body ground.
Voltage: 9 Ð 14 V
Check for short in the harness and all the compo-
nents connected to EFI No.1 fuse (See attached
wiring diagram).
Are the diagnostic trouble codes still in the memory when the ignition switch
is turned OFF?
Check and replace engine control module.
Proceed to next circuit inspection shown on matrix
chart (See page EG±514).
EG±582± ENGINE2JZ±GTE ENGINE TROUBLESHOOTING
Page 2090 of 2543
Injector Circuit
CIRCUIT DESCRIPTION
The injectors are located in the intake manifold. They inject fuel into the cylinders based on the signals
from the engine control module.
With engine idling measure waveform between terminals # 10 ~ 60 and E01 of engine control
module.
HINT: The correct waveform is as shown.
INSPECTION USING OSCILLOSCOPEReferenceINSPECTION USING OSCILLOSCOPE
± ENGINE2JZ±GTE ENGINE TROUBLESHOOTINGEG±583
Page 2091 of 2543
INSPECTION PROCEDURE
Remove AM2 fuse from R/B No.2.
Check continuity of AM2 fuse.
Continuity
Check voltage between terminals # 10 ~ 60 of engine control module and
body ground.
Check AM2 fuse.
(1) Connect SST (check harness ªAº).
See page EG±510)
SST 09990±01000
(2) Turn ignition switch ON.
Measure voltage between terminals # 10 ~ 60 of en-
gine control module and body ground.
Voltage: 9 Ð 14 V
Check for short in the harness and all the components
connected to AM2 fuse.
EG±584± ENGINE2JZ±GTE ENGINE TROUBLESHOOTING
Page 2092 of 2543

(See page IN±30).
Disconnect solenoid resistor connector.
Measure resistance between terminals 1 and 2
~
4, 6 ~ 8 of solenoid resistor connector.
Resistance: Approx. 6 at 20°C (68°F)
Check resistance between terminals 1 and 2 ~ 4, 6 ~ 8 of solenoid resistor
connector.
Check for open in harness and connector between terminal E01, E02 of ECM
connector and body ground (See page IN±30).
Disconnect injector connector.
See page EG±273)
Measure resistance of injector.
Resistance: Approx. 1.95 at 20°C (68°F)
Check injection volume of injector.
(See page EG±279)
Injection volume
124
~ cm3/15 sec.
(7.6 Ð 8.8 cu in./15 sec.)
Difference between each injector:
Less than 10 cm
3 (0.6 cu in.)
Leakage
Fuel drop: One drop or less per minute
Replace solenoid resistor.
Check and repair harness and connector
between engine control module and battery.
Repair or replace harness or connector.
Replace injector.
Check and replace engine control module.
Check injectors.
Check and replace engine control module.
± ENGINE2JZ±GTE ENGINE TROUBLESHOOTINGEG±585
Page 2093 of 2543
CIRCUIT DESCRIPTION
The IAC valve is situated on the intake air chamber In-
take air bypassing the throttle valve is directed to the
IAC valve through a passage.
A step motor is built into the IAC valve. It consists of 4
coils, a magnetic rotor, valve shaft and a valve.
When the current flows to the coils due to signals from
the ECM, the rotor turns and moves the valve shaft for-
ward or backward, changing the clearance between
the valve and the valve seat.
In this way the intake air volume bypassing the throttle
valve is regulated, controlling the engine speed.
There are 125 possible positions to which the valve can
be opened.
With the engine idling measure wave forms
between terminals ISC1, ISC2, ISC3,
ISC4 and E01 of engine control module
when A/C switch ON or OFF.
HINT:
The correct waveforms are as shown.
INSPECTION USING OSCILLOSCOPEReference
IAC Valve Circuit
EG±586± ENGINE2JZ±GTE ENGINE TROUBLESHOOTING
Page 2094 of 2543
± ENGINE2JZ±GTE ENGINE TROUBLESHOOTINGEG±587
Page 2095 of 2543
INSPECTION PROCEDURE
(See page IN±30).
(See page EG±514).
Disconnect IAC valve connector.
Measure resistance between terminals shown be-
low.
Check IAC valve.
Check for open and short in harness and connector between EFI main relay
and IAC valve, IAC valve and engine control module (See page IN±30).
Repair or replace harness or connector.
Remove IAC Valve.
(1) Connect the battery positive lead to terminals
5 (B1) and 2 (B2), and the negative lead to ter±
minals 4(S1)Ð1(S2)Ð6(S3)Ð3(S4) in that or
der.
(2) Connect the battery positive lead to terminals
5 (B1) and 2 (B2) and the negative lead to ter±
minals 3(S4)Ð6(S3)Ð1(S2)Ð4(S1) in that or
der.
(1) The valve moves in the closing direction
(2) The valve moves in the opening direction.
Replace IAC valve.
Proceed to next circuit inspection shown on ma-
trix chart (See page EG±514).
TerminalResistance
EG±588± ENGINE2JZ±GTE ENGINE TROUBLESHOOTING
Page 2096 of 2543
Turbo Control Circuit
CIRCUIT DESCRIPTION
[HINT]This turbocharger system has 3 control valves (Exhaust Bypass Valve, Exhaust Gas Control
Valve, Intake Air control Valve). Each valve is controlled by turbo pressure which is controlled
by VSV based on signals from ECM.
1.EXHAUST BYPASS VALVE
This valve controls the opening or closing of the exhaust bypass passage to ensure a smooth
transition from 1 turbo operation to 2 turbo operation.
2. EXHAUST GAS CONTROL VALVE
This valve controls the opening or closing of the No.2 exhaust passage in order to operate No.2
turbocharger.
3. INTAKE AIR CONTROL VALVE
This valve controls the opening or closing of the No.2 intake air passage in order to pass the
charged air from No.2 turbocharger.
± ENGINE2JZ±GTE ENGINE TROUBLESHOOTINGEG±589