1996 TOYOTA LAND CRUISER check engine

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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DI−11 4
−
DIAGNOSTICS ENGINE
1996 LAND CRUISER (RM451U)
9 Check for open and short in harness and connector between terminal MREL of
ECM connector and body ground (See page IN−28).
NG Repair or replace harness or connector.
OK
Check for open and short in harness and
connector between terminal +B of ECM
connector and battery (See page IN−28 ).
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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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A00193
Continuity ContinuityOpen
Open (+) (−) 1
2
3
4
5
6
1
2
3
6
54
P24685
P24686
P24687
FPR
(+)
(−)
−
DIAGNOSTICS ENGINE
DI−11 9
1996 LAND CRUISER (RM451U)
5 Check operation of fuel pump relay.
PREPARATION:
(a) Disconnect fuel pump relay connector.
(b) Remove fuel pump relay.
CHECK:
Check continuity between terminals of fuel pump relay.
OK:
Terminals 3 and 5Continuity
Terminals 2 and 5Open
Terminals 1 and 5Continuity
(Reference value 80 Ω)
CHECK:
(a) Apply battery voltage between terminals 1 and 5.
(b) Measure voltage between terminals 1 and 2.
OK:
Terminals 1 and 2Battery voltage
NG Replace fuel pump relay.
OK
6 Check voltage between terminal FPR of ECM connector and body ground.
PREPARATION:
(a) Remove instrument panel speaker No.1 panel (See page
SF−65 ).
(b) Start the engine.
CHECK:
Measure voltage between terminal FPR of ECM and body
ground while racing the engine.
OK:
Time after engine startedVoltage
60 seconds or more0 − 3 V
Less than 60 seconds9 − 14 V
OK Check and replace ECM (See page IN−28 ).
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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A00195
ONFC
BE6653
P22178
P09401
−
DIAGNOSTICS ENGINE
DI−121
1996 LAND CRUISER (RM451U)
10 Check fuel pump resistor. (See page SF−58).
NG Replace fuel pump resistor.
OK
Check for open and short in harness and connector between fuel pump relay and fuel\
pump resis-
tor and fuel pump (See page IN−28).
OBD II scan tool (excluding TOYOTA hand −held tester)
1 Check fuel pump operation.
PREPARATION:
(a) Remove instrument panel speaker No.1 panel (See page
SF−65 ).
(b) Turn ignition switch ON.
CHECK:
(a) Connect between terminal FC of ECM and body ground.
(b) Check for fuel pressure in the fuel inlet hose when it is pinched off.
OK:
There is pressure in the fuel inlet hose.
HINT:
At this time, you will hear a fuel flowing noise.
OK Go to step 4.
OK
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