1996 TOYOTA LAND CRUISER check engine

DI−122
−
DIAGNOSTICS ENGINE
1996 LAND CRUISER (RM451U)
2 Check circuit opening relay (See page DI−84 ).
NG Replace circuit opening relay.
OK
3 Check voltage between terminal FC of ECM connector and body ground (See\
step 3 of TOYOTA hand −held tester).
OK Go to step 4.
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 Check operation of fuel pump relay (See step 5 of TOYOTA hand −held tester).
NG Replace fuel pump relay.
OK
5 Check voltage between terminal FPR of ECM connector and body ground (Se\
e step 6 of TOYOTA hand −held tester).
NG Check and replace ECM (See page IN−28 ).
6 Check for open and short in harness and connector between terminal FC of\
ECM
connector and fuel pump relay (See page IN−28).
NG Repair or replace harness or connector.
OK
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A00196
ONFC
High LowFPR
BE6653
P22901
P09401
−
DIAGNOSTICS ENGINE
DI−123
1996 LAND CRUISER (RM451U)
7 Check operation of fuel pump.
PREPARATION:
(a) Remove instrument panel speaker No.1 panel (See page
SF−65 ).
(b) Turn ignition switch ON.
CHECK:
(a) Connect terminal FC of ECM and body ground.
(b) Check operation of fuel pump when 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 8
NGOKGo to step 9
OKNG
Repair or replace
harness or connecter between fuel pump
relay and fuel pump.
8 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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DI−124
−
DIAGNOSTICS ENGINE
1996 LAND CRUISER (RM451U)
9 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).
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A00197
ONON
OFF
BE6653
P22965
P22966
G
E
G E Air Filter
Air Filter
DI−126
−
DIAGNOSTICS ENGINE
1996 LAND CRUISER (RM451U)
INSPECTION PROCEDURE
TOYOTA hand −held tester
1 Connect the TOYOTA hand−held tester and check operation of VSV for fuel
pressure control.
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) Select the ACTIVE TEST mode on the TOYOTA hand −
held tester.
CHECK:
Check operation of VSV when VSV is operated by the T OYOTA
hand −held tester.
OK:
VSV is ON:
Air from pipe E is flowing out through the air filter.
VSV is OFF:
Air from pipe E is flowing out through pipe G.
OK Check and repair fuel pressure regulator (See page SF−19 ).
NG
2 Check VSV for fuel pressure control (See page SF−59).
NG Replace VSV for fuel pressure control.
OK
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A00198
ONFPU
(+)
(−)
BE6653
P24688
−
DIAGNOSTICS ENGINE
DI−127
1996 LAND CRUISER (RM451U)
3 Check for open and short in harness and connector between EFI main relay
(Marking: EFI) and ECM (See page IN−28).
NG Repair or replace harness or connector.
OK
Check and replace ECM (See page IN−28 ).
OBD II scan tool (excluding TOYOTA hand −held tester)
1 Check VSV for fuel pressure control (See page SF−59 ).
NG Replace VSV for fuel pressure control.
OK
2 Check voltage between terminal FPU 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 FPU of ECM connector and
body ground.
OK:
Voltage: 9 − 14 V
NG Check for open and short in harness and con- nector between EFI main relay (Marking: EFI)
and ECM (See page IN−28 ).
OK
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DI−128
−
DIAGNOSTICS ENGINE
1996 LAND CRUISER (RM451U)
3 Check fuel pressure regulator (See page SF−19 ).
NG Repair or replace fuel pressure regulator.
OK
Check and replace ECM (See page IN−28 ).
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Q08225
Q08634
TOYOTA Hand−held Tester
DLC3
DI−132
−
DIAGNOSTICS AUTOMATIC TRANSMISSION
1996 LAND CRUISER (RM451U)
The diagnosis system operates in normal mode
during normal vehicle use, and also has a check
mode for technicians to simulate malfunction symp-
toms and perform troubleshooting. Most DTCs use
2 trip detection logic(*) to prevent erroneous detec-
tion. By switching the ECM to check mode when
troubleshooting, the technician can cause the MIL
to light up for a malfunction that is only detected
once or momentarily (TOYOTA hand−held tester)
(See step 3).
*2 trip detection logic:
When a logic malfunction is first detected, the mal-
function is temporarily stored in the ECM memory.
If the same malfunction is detected again during the 2nd test
drive, this 2nd detection causes the MIL to light up.
2. Normal Mode: INSPECT DIAGNOSIS
(a) Check the MIL. (1) The MIL lights up when the ignition switch is turnedON and the engine is not running.
HINT:
If the MIL does not light up, troubleshoot the combination meter
(See page BE−2 ).
(2) When the engine is started, the MIL should go off.
If the lamp remains on, the diagnosis system has
detected a malfunction or abnormality in the sys-
tem.
(b) Check the DTC.
NOTICE:
TOYOTA hand−held tester only:
When the diagnostic system is switched from the normal
mode to the check mode, it erases all DTCs and freeze
frame data recorded in the normal mode. So before switch-
ing modes, always check the DTCs and freeze frame data,
and note them down. (1) Prepare the OBD II scan tool (complying with SAEJ1978) or TOYOTA hand−held tester.
(2) Connect the OBD II scan tool or TOYOTA hand−
held tester to the DLC3 in the fuse box at the lower
left of the instrument panel.
(3) Turn the ignition switch ON and turn the OBD II scan
tool or TOYOTA hand−held tester switch ON.
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Q08634
TOYOTA Hand−held Tester
DLC3
FI3605
ON
OFF 0.13 sec.
Flashing
−
DIAGNOSTICS AUTOMATIC TRANSMISSION
DI−133
1996 LAND CRUISER (RM451U)
(4) Use the OBD II scan tool or TOYOTA hand−held
tester to check the DTCs and freeze frame data.
Note them down (For operating instructions, see
the OBD II scan tool’s instruction book).
(5) See page DI−143 to confirm the details of the
DTCs.
NOTICE:
When simulating symptoms with an OBD II scan tool (ex-
cluding TOYOTA hand −held tester) to check the DTCs, use
the normal mode. For codes on the DTC chart subject to ”2
trip detection logic”, turn the ignition switch off after the
symptoms have been simulated for the 1st time. Them re-
peat the simulation process again. When the program has
been simulated twice, the MIL lights up and the DTCs are
recorded in the ECM.
3. Check Mode: INSPECT DIAGNOSIS
HINT:
TOYOTA hand−held tester only:
Compared to the normal mode, the check mode has high sens-
ing ability to detect malfunctions. Furthermore, the same diag-
nostic items which are detected in the normal mode can also be
detected in check mode.
(a) Check the DTC. (1) Check the initial conditions.
Battery positive voltage 11 V or more.
Throttle valve fully closed.
Transmission in P position.
Air conditioning switched off.
(2) Turn the ignition switch OFF.
(3) Prepare the TOYOTA hand−held tester.
(4) Connect the TOYOTA hand− held tester to the
DLC3 in the fuse box at the lower left of the instru-
ment panel.
(5) Turn the ignition switch ON and switch the T OYOTA
hand −held tester ON.
(6) Switch the TOYOTA hand −held tester from the nor-
mal mode to the check mode (Check that the MIL
flashes).
(7) Start the engine (The MIL goes).
(8) Simulate the conditions of the malfunction de- scribed by the customer.
NOTICE:
Leave the ignition switch ON until you have checked the
DTCs etc.
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