
P22474
EB
BR
2
2
2
2
1
3
4
2
2
2
R
−
Y
R/B
No.2
From Battery
R
Y
−
R
EA2
EB1
Y
−
R
Y
−
R
Y
−
R
R
R
−
G
R
−
B
G
−
Y
Y
−
L
4
1
3
6
IAC Valve
MRLY
E7
E4
E4
E4
E4
7
3
6
5
4
ISC1
ISC2
ISC3
ISC4
B+
E01
E01
E01
E01
EFI
2
5
E
F
I Main
Relay
7
1
ECM
A00202
ISC1
ISC2
ISC3
ISC4
A/C Switch OFF
→
ON
(IAC Valve Open)
20 V/
Division
10 msec./Division
ISC1
ISC2
ISC3
ISC4
20 V/
Division
10 msec./Division
(IAC Valve Close)
A/C Switch ON
→
OFF
FI6536
FI6537
DI
−
90
−
DIAGNOSTICS
ENGINE
1996 LAND CRUISER (RM451U)
WIRING DIAGRAM
Reference: INSPECTION USING OSCILLOSCOPE
With the engine idling measure wavefoms between terminals
ISC1, ISC2, ISC3, ISC4 and E01 of ECM when A/C switch ON
or OFF.
HINT:
The correct waveforms are as shown.
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Brought to you by BirfMark
Version 1.00 - 12/21/2010