A00178
ON
ISC1 ISC3
ISC2 ISC4
E4 connector
(
−
) (+)
BE6653
P24669
−
DIAGNOSTICS
ENGINE
DI
−
91
1996 LAND CRUISER (RM451U)
INSPECTION PROCEDURE
1
Check air induction system (See page
SF
−
1
).
NG
Repair or replace.
OK
2
Check voltage terminals ISC1, ISC2, ISC3, ISC4, of ECM connector and body
ground.
PREPARATION:
(a)
Remove instrument panel speaker No.1 panel (See page
SF
−
65
).
(b)
Disconnect the E4 connector of ECM.
(c)
Turn ignition switch ON.
CHECK:
Measure voltage between terminals ISC1, ISC2, ISC3, ISC4 of
ECM connector and body ground.
OK:
Voltage: 9
−
14 V
OK
Go to step 4.
NG
3
Check IAC valve (See page
SF
−
49
).
NG
Replace IAC valve.
OK
Check for open and short in harness and co
−
nnector between EFI main relay (Marking:EFI) and
IAC valve and ECM (See page
IN
−
28
).
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Brought to you by BirfMark
Version 1.00 - 12/21/2010