1986 TOYOTA SUPRA check engine

Check IGN fuse.
Remove IGN fuse from J/B No.1.
Check continuity of IGN fuse.
Continuity
Check for short in the harness and all the com-
ponents connected to IGN fuse (See Electrical
Wiring Diagram).
Check ignition switch.
(1) Remove finish lower panel and finish lower
panel LH.
(2) Remove heater to register duct No.2.
Check continuity between terminals.
Replace ignition switch.
Check and repair harness and connector between
battery and ignition switch, ignition switch and en-
gine control module.
± ENGINE2JZ±GE ENGINE TROUBLESHOOTINGEG±467

Check voltage between terminal M±REL of engine control module connector
and body ground.
Turn ignition switch ON.
Measure voltage between terminal M±REL of en-
gine control module connector and body ground.
Voltage: 9 Ð 14 V
Check and replace engine control module.
Check EFI No.1 Fuse.
Remove EFI No.1 fuse from R/B No.2.
Check continuity of EFI No.1 fuse.
Continuity
Check for short in the harness and all the compo-
nents connected to EFI No.1 fuse (See Electrical
Wiring Diagram).
EG±468± ENGINE2JZ±GE ENGINE TROUBLESHOOTING

Check EFI main relay.
Remove EFI main relay from R/B No.2.
Check continuity between terminals of EFI main
relay shown below.
Replace EFI main relay.
(1) Apply battery voltage between terminals 1
and 2.
(2) Check continuity between terminals 3 and 5.
Repair or replace harness or connector.
Check and repair harness or connector between
EFI No.1 fuse and battery.
Check for open and short in harness and connector between terminal M±REL
of engine control module and body ground(See page
IN±30).
Terminals 3 and 5
Terminals 3 and 5
Terminals 1 and 2
Open
Continuity
Continuity
(Reference value 72
)
± ENGINE2JZ±GE ENGINE TROUBLESHOOTINGEG±469

INSPECTION PROCEDURE
Check EFI No.1 Fuse.
Remove EFI No.1 fuse from R/B No.2.
Check continuity of EFI No.1 fuse.
Continuity
Check for short in the harness and all the com-
ponents connected to EFI No.1 fuse (See Electri-
cal Wiring Diagram).
Connect SST (check harness ªAº).
(See page EG±404)
SST 09990±01000
Measure voltage between terminal BATT of en-
gine control module connector and body ground.
Voltage: 9 Ð 14 V
Check and replace engine control module.
Check and repair harness or connector between
engine control module and EFI No.1 fuse, EFI No.1
fuse and battery.
Proceed to next circuit inspection shown on matrix
chart (See page
EG±408).
Check voltage between terminal BATT of engine control module connector
and body ground.
Are the diagnostic trouble codes still in the memory when the ignition switch
is turned OFF?
± ENGINE2JZ±GE ENGINE TROUBLESHOOTINGEG±471

INSPECTION PROCEDURE
(See page EG±404)
Check voltage between terminals # 10 ~ 60 of engine control module and
body ground.
(1) Connect SST check harness ªAº).
(See page EG±404)
SST 09990±01000
(2) Turn ignition switch ON.
Measure voltage between terminals #10
~ 60 of
engine control module and body ground.
Voltage: 9 Ð 14 V
Check for short in the harness and all the compo-
nents connected to AM2 fuse.
Remove AM2 fuse from R/B No.2.
Check continuity of AM2 fuse.
Continuity
Check and repair harness or connector between en-
gine control module and battery.
Check AM2 Fuse.
± ENGINE2JZ±GE ENGINE TROUBLESHOOTINGEG±473

(See page
EG±202)
Check for open in harness and connector between terminal E)1, EO2 of ECM
connector and body ground (See page
IN±30).
Disconnect injector connector. (See page EG±202)
Measure resistance of injector.
Resistance: 13.4 Ð 14.2
at 20°C (68°F)
Check injector volume of injector.
(See page EG±207)

Injection volume
70 Ð 88 cc/15 sec.
(4.3 Ð 5.4 cu in./15 sec.)
Difference between each injector:
Less than 9 cc (0.5 cu in.)

Leakage
Fuel drop: One drip or less per minute
Replace injector.
Check and replace engine control module.
Check injectors.
Repair or replace harness or connector.
Replace injector.
Check and replace engine control module.
EG±474± ENGINE2JZ±GE ENGINE TROUBLESHOOTING

INSPECTION PROCEDURE
Check IAC valve.
Disconnect IAC valve connector.
Measure resistance between terminals shown be-
low.
Replace IAC valve.
Remove IAC valve.
(1) Connect the battery positive lead to terminals 5
(B1) and 2 (B2), and the negative lead to termi±
nals 4(S1)Ð1(S2)Ð6(S3)Ð3(S4) in that order.
(2) Connect the battery positive lead to terminals 5
(B1) and 2 (B2), and the negative lead to termi±
nals 3(S4)Ð6(S3)Ð1(S2)Ð4(S1) in that order.
(1) The valve moves in the closing direction.
(1) The valve moves in the opening direction.
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.
Proceed to next circuit inspection shown on matrix
chart (See page
EG±408).
TerminalResistance
± ENGINE2JZ±GE ENGINE TROUBLESHOOTINGEG±477

INSPECTION PROCEDURE
Check VSV for ACIS.
(1) Remove VSV.
(2) Disconnect VSV connector.
(1) Measure resistance between terminals.
(2) Measure resistance between each terminal
and the body.
(1) Resistance: 38.5 Ð 44.5
at 20°C (68°F)
(2) Resistance: 1 M
or higher
Check operation of VSV when battery positive
voltage is applied and released to the VSV termi-
nals.
Battery positive voltage is applied:
Air from port E is flowing out through port F.
Battery positive voltage is not applied:
Air from port E is flowing out through the air
filter.
Replace VSV for ACIS.
± ENGINE2JZ±GE ENGINE TROUBLESHOOTINGEG±479