1996 TOYOTA LAND CRUISER ignition

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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A00192
ONFC
(+)
(−)
BE6653
P24684
DI−11 8
−
DIAGNOSTICS ENGINE
1996 LAND CRUISER (RM451U)
3 Check voltage between terminal FC 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 FC of ECM and body
ground.
OK:
Voltage: 9 − 14 V
OK Go to step 5.
NG
Check for open and short in harness and connector between terminal FC of ECM a\
nd circuit open-
ing relay and fuse block (See page IN−28).
4 Connect the TOYOTA hand−held tester and check operation of fuel pump relay.
PREPARATION:
(a) Connect the TOYOTA hand−held tester to the DLC3.
(b) Start the engine.
(c) Turn TOYOTA hand−held tester main switch ON.
(d) Select the ACTIVE TEST mode on the TOYOTA hand−held tester.
CHECK:
Check operation of fuel pump relay when it is switched ON and OFF by the\
TOYOTA hand −held tester.
OK:
Operating noise can be heard from the relay.
OK Go to step 8.
NG
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A00194
HighLowFPR
P22900
P09401
DI−120
−
DIAGNOSTICS ENGINE
1996 LAND CRUISER (RM451U)
7 Check for open and short in harness and connector between terminal FPR of
ECM connector and fuel pump relay (See page IN−28).
NG Repair or replace harness or connector.
OK
8 Check operation of fuel pump.
PREPARATION:
(a) Remove instrument panel speaker No.1 panel (See page
SF−65 ).
(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 operation of fuel pump, when it is operated by the TOYO-
TA hand− held tester and terminal FPR of ECM is grounded and
is not grounded.
OK:
There is pressure in the inlet hose.
HINT:
At this time, you will hear a fuel flowing noise.
FPR is grounded
(Low speed)FPR is not grounded (High speed)
NGNGGo to step 9
NGOKGo to step 10
OKNG
Repair or replace
harness or connector between fuel pump
relay and fuel pump.
9 Check fuel pump (See page SF−6 ).
NG Repair or replace fuel pump.
OK
Check for open or short in harness and connector between EFI main relay (Mark\
ing: EFI) and cir-
cuit opening relay and fuel pump relay and fuel pump and body ground (See p\
age IN−28).
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