1996 TOYOTA LAND CRUISER Ignition switch

DI−104
−
DIAGNOSTICS ENGINE
1996 LAND CRUISER (RM451U)
INSPECTION PROCEDURE
HINT:
This diagnostic chart is based on the premise that the engine is cranked normally. If the engine is not
cranked, proceed to the matrix chart of problem symptoms on page DI−19.
1 Connect TOYOTA hand −held tester and check STA signal.
PREPARATION:
(a) Connect the TOYOTA hand−held tester to the DLC3.
(b) Turn ignition switch ON and push TOYOTA hand −held tester main switch ON.
CHECK:
Read STA signal on the TOYOTA hand −held tester while starter operates.
OK:
Ignition Switch PositionONSTART
STA SignalOFFON
OK Proceed to next circuit inspection shown on matrix chart (See page DI−19 ).
NG
2 Check for open in harness and connector between ECM and starter relay (See page IN−28 ).
NG Repair or replace harness or connector.
OK
Check and replace ECM
(See page IN−28 ).
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P22477
BatteryFusible Link
E8
1 W
2 2
EFI
R/B No.2
R−YR−Y
EA2E7ECM
BATT
2
FL MAIN
2
−
DIAGNOSTICS ENGINE
DI−105
1996 LAND CRUISER (RM451U)
DTC P1600 ECM BATT Malfunction
CIRCUIT DESCRIPTION
Battery positive voltage is supplied to terminal BATT of the ECM even when the ignition switch is OFF for
use by the DTC memory and air −fuel ratio adaptive control value memory, etc.
DTC No.DTC Detecting ConditionTrouble Area
P1600Open in back up power source circuitOpen in back up power source circuit
 ECM
HINT:
If DTC P1600 appear, the ECM does not store another DTC.
WIRING DIAGRAM
DI5PT−02
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P24677
32
4
10 98 6
51
7
A00188
ON
NSW
(+)
(−)
BE6653
P24678
−
DIAGNOSTICS ENGINE
DI−109
1996 LAND CRUISER (RM451U)
INSPECTION PROCEDURE
1 Check park/neutral position switch.
PREPARATION:
Disconnect park/neutral position switch connector.
CHECK:
Check continuity between each terminal shown below when the
shift lever is positioned to each range.
OK:
Shift PositionTerminal No. to continuityTerminal No. to continuity
P4 − 75 − 6
R4 − 8−
N4 − 105 − 6
D4 − 9−
22 − 4−
L3 − 4−
NG Replace park/neutral position switch.
OK
2 Check voltage between terminal NSW of ECM connector and body ground.
PREPARATION:
Remove instrument panel speaker No.1 panel
(See page SF−65 ).
CHECK:
(a) Turn ignition switch ON.
(b) Measure voltage between terminal NSW of ECM connec-
tor and body ground when the shift lever is positioned to
the following positions.
OK:
Shift lever positionP or NL, 2, D or R
Voltage0 V9 − 14 V
OK Check and replace ECM (See page IN−28 ).
NG
Check for open and short in harness and
connector between ECM and park/neutral
position switch (See page IN−28).
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S00816
BatteryFusible
Link
F8F7
11
W−R
3EA2
W−R11 6
IG Switch B−R
Fuse BlockIGN B−L
22
22 2
2
EFI Main Relay
1
2
3 4
EFI R
−Y
EC
EB
B−R
1EB1
R
Y−R
Y−REA2IH1
22 7
BR−B E4
E7 E7 E7
IGSW
MRLY
+B
E1 B+
ECM
1
3
12
24FL AM2
FL MAIN
W R
R/B No.2 Y
DI−11 0
−
DIAGNOSTICS ENGINE
1996 LAND CRUISER (RM451U)
ECM Power Source Circuit
CIRCUIT DESCRIPTION
When the ignition switch is turned ON, battery positive voltage is applied t\
o the coil, closing the contacts of
the EFI main relay (Marking: EFI) and supplying power to the terminals +B\
of the ECM.
WIRING DIAGRAM
DI5PX−02
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A00189
ON
E1 +B
(−) (+)
BE6653
P24679
A00190
ON
IGSW
(+)
(−)
BE6653
P24680
−
DIAGNOSTICS ENGINE
DI−111
1996 LAND CRUISER (RM451U)
INSPECTION PROCEDURE
1 Check voltage between terminals +B and E1 of the ECM connector.
PREPARATION:
(a) Remove instrument panel speaker No.1 panel
(See page SF−65 ).
(b) Turn ignition switch ON.
CHECK:
Measure voltage between terminals +B and E1 of the ECM con-
nector.
OK:
Voltage: 9 − 14 V
OK Proceed to next circuit inspection shown on matrix chart (See page DI−19 ).
NG
2 Check for open in harness and connector between terminal E1 of ECM conne\
ctor and body ground (See page IN−28).
NG Repair or replace harness or connector.
OK
3 Check voltage between terminal IGSW of ECM connector and body ground.
PREPARATION:
(a) Remove instrument panel speaker No.1 panel (See page SF−65 ).
(b) Turn ignition switch ON.
CHECK:
Measure voltage between terminals IGSW of ECM and body
ground.
OK:
Voltage: 9 − 14 V
OK Go to step 6.
NG
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P24681
DI−11 2
−
DIAGNOSTICS ENGINE
1996 LAND CRUISER (RM451U)
4 Check IGN fuse from fuse block.
NG Check for short in all the harness and
components connected to IGN fuse.
OK
5 Check ignition switch.
PREPARATION:
(a) Remove instrument lower finish panel.
(b) Remove instrument cluster finish center panel No.2.
CHECK:
Check continuity between terminals.
OK:
Shift PositionTerminal No. to continuityTerminal No. to continuity
LOCK−−
ACC3 − 4−
ON2 − 3 − 46 − 11
START1 − 2 − 45 − 6 − 11
NG Replace ignition switch.
OK
Check for open and short in harness and
connector between battery and ignition
switch and ECM.
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A00191
ONMRLY(+)
(−)
BE6653
P24682
−
DIAGNOSTICS ENGINE
DI−11 3
1996 LAND CRUISER (RM451U)
6 Check voltage between terminal MREL of ECM connector and body ground.
PREPARATION:
(a) Remove instrument panel speaker No.1 panel
(See page SF−65 ).
(b) Turn ignition switch ON.
CHECK:
Measure voltage between terminal MREL of ECM and body
ground.
OK:
Voltage: 9 − 14 V
NG Check and replace ECM.
OK
7 Check EFI fuse (Marking: EFI) (See page DI−105).
NG Check for short in all the harness and
components connected to EFI fuse.
OK
8 Check EFI main relay (Marking: EFI) (See page SF−54).
NG Replace EFI main relay (Marking: EFI).
OK
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P09401
−
DIAGNOSTICS ENGINE
DI−11 7
1996 LAND CRUISER (RM451U)
INSPECTION PROCEDURE
TOYOTA hand −held tester
1 Connect the TOYOTA hand −held tester and check operation of fuel pump.
PREPARATION:
(a) Remove the fuse cover on the instrument panel.
(b) Connect the TOYOTA hand−held tester to the DLC3.
(c) Turn ignition switch ON and TOYOTA hand −held tester
main switch ON.
(d) Use ACTIVE TEST mode to operate the fuel pump.
CHECK:
Check for fuel pressure in the fuel return hose when it is pinched
off.
OK:
There is pressure in the fuel return hose.
HINT:
At this time, you will hear a fuel flowing noise.
OK Go to step 4.
NG
2 Check circuit opening relay (See page SF−56 ).
NG Replace circuit opening relay.
OK
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