1996 TOYOTA LAND CRUISER wiring

I00497
Cruise Control ECU
B−R BATT
C17
W
W Instrument Panel Fuse Block
Fusible Link
F8 F11
F11
EA3
FL MAIN
Battery 3
ECU−B 15
2
1
N18670
Junction Block No.1
ECU−IG
Fuse
DI−328
−
DIAGNOSTICS CRUISE CONTROL SYSTEM
1996 LAND CRUISER (RM451U)
Back −up Power Source Circuit
CIRCUIT DESCRIPTION
The ECU back− up power source provides power even when the ignition is off and is used for DTC memory,
etc..
WIRING DIAGRAM
INSPECTION PROCEDURE
1 Check ECU −IG fuse.
PREPARATION:
Remove the ECU −IG fuse from relay block No.2.
CHECK:
Check continuity of ECU −IG fuse.
OK:
Continuity
NG Check for short in all the harness and compo- nents connected to the ECU −IG fuse.
OK
DI5ON−02
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AB0119I00013 I00028
ONCMS
(−)
(+)
DI−330
−
DIAGNOSTICS CRUISE CONTROL SYSTEM
1996 LAND CRUISER (RM451U)
Main Switch Circuit (Cruise Control Switch)
CIRCUIT DESCRIPTION
When the cruise control main switch is turned off, the cruise control does not operate.
WIRING DIAGRAM
See page DI−311 .
INSPECTION PROCEDURE
1 Check voltage between terminal CMS of cruise control ECU connector and body
ground.
PREPARATION:
(a) Remove the ECU with connector still connected.
(b) Turn ignition switch ON.
CHECK:
Measure voltage between terminal CMS of cruise control ECU
connector when main switch is held on and off.
OK:
Main switchVoltage
OFF10 − 14 V
ONBelow 2 V
OK Proceed to next circuit inspection shown on
problem symptoms table (See page DI−295 ).
NG
DI5OO−02
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I00498
Cruise Control ECU
C17
Battery Fusible
Link
F6 B−L W
B
B G−Y
F11 F11
GAUGE
Y
2
Y9
CRUISE MAIN Indicator (Combination Meter)C10
C10
2 2 2
2
22
43
EA2
6
Ignition Switch
I12 I12
4
Instrument Panel Fuse Block
1
AM1
AM1 J1
JUNCTION
CONNECTOR
PI
7
DI−332
−
DIAGNOSTICS CRUISE CONTROL SYSTEM
1996 LAND CRUISER (RM451U)
CRUISE MAIN Indicator Light Circuit
CIRCUIT DESCRIPTION
When the cruise control main switch is turned ON, CRUISE MAIN indicator ligh\
t lights up.
WIRING DIAGRAM
DI5OP−02
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I00499
Cruise Control ECU
DLC1
TC D111
B−Y IH111
B−YC17 TC8
N06219
DLC1
TC
E1
DI−334
−
DIAGNOSTICS CRUISE CONTROL SYSTEM
1996 LAND CRUISER (RM451U)
Diagnosis Circuit
CIRCUIT DESCRIPTION
This circuit sends a signal to the ECU that DTC output is required.
WIRING DIAGRAM
INSPECTION PROCEDURE
1 Check voltage between terminals Tc and E1 of DLC1.
PREPARATION:
Turn ignition switch ON.
CHECK:
Measure voltage between terminals Tc and E1 of DLC1.
OK:
Voltage: 10 − 14 V
OK Proceed to next circuit inspection shown on problem symptoms table (See page DI−295 ).
NG
DI5OQ−02
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EM1E0−04
−
ENGINE MECHANICAL CO/HC
EM−1
504
Author: Date:
1996 LAND CRUISER (RM451U)
CO/HC
INSPECTION
HINT:
This check is used only to det ermine whether or not the idle CO/
HC complies with regulations.
1. INITIAL CONDITIONS
(a) Engine at normal operating temperature
(b) Air cleaner installed
(c) All pipes and hoses of air induction system connected
(d) All accessories switched OFF
(e) All vacuum lines properly connected
HINT:
All vacuum hoses for EGR systems, etc. should be properly
connected.
(f) SFI system wiring connectors fully plugged
(g) Ignition timing set correctly
(h) Transmission in neutral position
(i) Tachometer and CO/HC meter calibrated by hand
2. START ENGINE
3. RACE ENGINE AT 2,500 RPM FOR APPROX. 180 SE-
CONDS
4. 4.INSERT CO/HC METER TESTING PROBE AT LEAST
40 cm (1.3 ft) INTO TAILPIPE DURING IDLING
5. IMMEDIATELY CHECK CO/HC CONCENTRATION AT IDLE AND/OR 2,500 RPM
HINT:
When doing the 2 mode (2,500 rpm and idle) test, follow the
measurement order prescribed by the applicable local regula-
tions.
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EM0KU−05
−
ENGINE MECHANICAL IDLE SPEED
EM−11
514
Author: Date:
1996 LAND CRUISER (RM451U)
IDLE SPEED
INSPECTION
1. INITIAL CONDITIONS
(a) Engine at normal operating temperature.
(b) Air cleaner installed.
(c) All pipes and hoses of air induction system connected.
(d) All accessories switched OFF.
(e) All vacuum lines properly connected.
HINT:
All vacuum hoses for EGR system, etc. should be properly connected.
(f) SFI system wiring connectors fully plugged.
(g) Ignition timing set correctly.
(h) Transmission in neutral position.
(i) Air conditioning switched OFF.
2. CONNECT TOYOTA HAND−HELD TESTER OR OBD II SCAN TOOL (See page EM−10)
3. INSPECT IDLE SPEED
(a) Race the engine speed at 2,500 rpm for approx. 90 seconds.
(b) Check the idle speed.
Idle speed: 650 ± 50 rpm
If the idle speed is not as specified, check the IAC valve.
4. DISCONNECT TOYOTA HAND−HELD TESTER OR OBD II SCAN TOOL
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EM−74
−
ENGINE MECHANICAL ENGINE UNIT
1996 LAND CRUISER (RM451U)
29. REMOVE FRAME CROSSMEMBER
(a) Remove the 2 nuts holding the crossmember to the en-
gine rear mounting insulator.
(b) Remove the 8 bolts and crossmember.
30. REMOVE ENGINE WITH TRANSMISSION
(a) Attach the engine hoist chain to the 2 engine hangers.
(b) Remove the 2 nuts holding the engine front mounting in- sulators to the frame.
(c) Lift the engine with transmission out of the vehicle slowly
and carefully.
NOTICE:
Make sure that the engine is clear of all wiring and hoses.
(d) Place the engine and transmission assembly onto the stand.
31. REMOVE OIL DIPSTICK GUIDE FOR TRANSMISSION
(a) Disconnect the 2 breather hoses.
(b) Remove the 2 mounting bolts.
(c) Pull out the dipstick guide and dipstick from the transmis- sion.
(d) Remove the O−ring from the dipstick guide.
32. DISCONNECT ENGINE WIRE FROM TRANSMISSION
(a) Disconnect the PNP switch connector.
(b) Disconnect the 2 connectors from the transmission.
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IG0IB−02
SPARK TEST
TRY ANOTHER IGNITERNO
OK
OK
OK
OK
OK
BAD
BAD
BAD
BAD
BAD
BADConnect securely.
Replace the cord(s).
Replace the distributor housing assembly.
Check wiring between ECM, ignition coil and
igniter, and then try another ECM.
CHECK CONNECTION OF IGNITION COIL, IGNITER AND
DISTRIBUTOR CONNECTOR
CHECK RESISTANCE OF HIGH−
TENSION CORD
(See step 8)
Maximum resistance: 25 k Ω per cord
CHECK RESISTANCE OF IGNITION COIL (See step 24)
Resistance: Cold Hot
Primary 0.36 − 0.55 Ω 0.45 − 0.65 Ω
Secondary 9.0 − 15.4 kΩ 11.4 − 18.1 kΩ
CHECK AIR GAP OF DISTRIBUTOR (See step 31)
Air gap: 0.2 − 0.4 mm (0.008 −0.016 in.)
OK
CHECK RESISTANCE OF SIGNAL GENERATOR
(PICKUP COIL) (See step 32)
Resistance: Cold Hot
G1 and G− 185 − 275 Ω 240 − 325 Ω
G2 and G− 185 − 275 Ω 240 − 325 Ω
NE and G − 185 − 275 Ω 240 − 325 Ω
CHECK IGT SIGNAL FROM ECM
(See page DI−93 ) Check
wiring between ignition switch to ignition
coil and igniter.
Replace the ignition coil.
Replace the distributor housing assembly.
BAD
OK
CHECK
POWER SUPPLY TO IGNITION COIL AND IGNITER
1. Turn ignition switch to ON.
2. Check that there is battery voltage at ignition coil positive (+)
terminal.
−
IGNITION IGNITION SYSTEM
IG−1
735
Author: Date:
1996 LAND CRUISER (RM451U)
IGNITION SYSTEM
ON−VEHICLE INSPECTION
1. CHECK THAT SPARK OCCURS
(a) Disconnect the high −tension cords (from the ignition coil)
from the distributor cap.
(b) Hold the end approx. 12.5 mm (0.50 in.) from the body ground.
(c) Check if spark occurs while engine is being cranked.
HINT:
To prevent gasoline from being injected from injectors during
this test, crank the engine for no more than 1 − 2 seconds at a
time.
If the spark does not occur, do the test as follows:
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