1996 TOYOTA LAND CRUISER Timing

DI−58
−
DIAGNOSTICS ENGINE
1996 LAND CRUISER (RM451U)
5 Check injector injection (See page SF−29).
NG Replace injector.
OK
6 Check EGR system (See page EC−11 ).
NG Repair EGR system.
OK
7 Check mass air flow meter and engine coolant temp. sensor (See page SF−40 ,
SF−61 ).
NG Repair or replace.
OK
Check engine mechanical systems compression pressure (See page EM−3), valve clearance
(See page EM−4) and valve timing (See page EM−13).
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P22425
Knock Sensor 1KNK2
Knock Sensor 2 KNK1
ECM
E1
E1
E5
E5
6
14
B
L−W
(On front side)
1
(On rear side) 1
−
DIAGNOSTICS ENGINE
DI−59
1996 LAND CRUISER (RM451U)
DTC P0325 Knock Sensor 1 Circuit Malfunction
DTC P0330 Knock Sensor 2 Circuit Malfunction
CIRCUIT DESCRIPTION
Knock sensors are fitted one each to the front and rear of the left side of t\
he cylinder block to detect engine
knocking. This sensor contains a piezoelectric element which generates a voltage \
when it becomes de-
formed, which occurs when the cylinder block vibrates due to knocking. If engin\
e knocking occurs, ignition
timing is retarded to suppress it.
DTC No.DTC Detecting ConditionTrouble Area
P0325No knock sensor 1 signal to ECM with engine speed, between
1,800 rpm and 5.200 rpmOpen or short in knock sensor 1 circuit
 Knock sensor 1 (looseness)
 ECM
P0330No knock sensor 2 signal to ECM with engine speed, between
1,800 rpm and 5.200 rpmOpen or short in knock sensor 2 circuit
 Knock sensor 2 (looseness)
 ECM
If the ECM detects the above DTCs, it operates the fail safe function in w\
hich the corrective retard angle value
is set to the maximum value.
WIRING DIAGRAM
DI5PG−02
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P22475
BatteryFusible
Link
FL AM2
F7W−R
EA2
W−R
B−R B−R
EA2
B−R
B−W B−W
W−B
Distributor
Ignition
Coil 4
12
EA2
IH1
W−B
8 1
2
Noise
Filter 45
B 3
Igniter Tr2
2
1
IH2 IH2
B−G
B−G
B−Y B−YE4
E4 IGT
IGF Tr15V
ECM
1 3 11
6
IG Switch
1
EC
17 23
14 13
−
DIAGNOSTICS ENGINE
DI−97
1996 LAND CRUISER (RM451U)
DTC P1300 Igniter Circuit Malfunction
CIRCUIT DESCRIPTION
The ECM determines the ignition timing, turns on Tr1 at a predetermined angle ( °CA) before the desired
ignition timing and outputs and ignition signal (IGT) ”1” to the\
igniter.
Since the width of the IGT signal is constant, the dwell angle control circuit in \
the igniter determines the time
the control circuit starts primary current flow to the ignition coil based \
on the engine rpm and ignition timing
one revolution ago, that is, the time the Tr2 turns on.
When it reaches the ignition timing, the ECM turns Tr1 off and outputs the IGT signal ”O”.
This turns Tr2 off, interrupting the primary current flow and generating a high voltage i\
n the secondary coil
which causes the spark plug to spark. Also, by the counter electromotive forc\
e generated when the primary
current is interrupted, the igniter sends an ignition confirmation signal (IGF)\
to the ECM. The ECM stops fuel
injection as a fail safe function when the IGF signal is not input to the ECM.
DTC No.DTC Detecting ConditionTrouble Area
P1300No IGF signal to ECM for 6 consecutive IGT signals during
engine running Open or short in IGF or IGT circuit from igniter to ECM
 Igniter
 ECM
WIRING DIAGRAM
DI5PQ−02
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Q07352 AT5605D00084
Rotor
No. 2 Vehicle Speed Sensor Rotor
No. 2 Vehicle Speed Sensor
AT8761
5 V/div.
0 V
2 msec./div.
DI−166
−
DIAGNOSTICS AUTOMATIC TRANSMISSION
1996 LAND CRUISER (RM451U)
DTC P1700 Speed Sensor No. 2 Circuit Malfunction
(No. 2 Vehicle Speed Sensor)
CIRCUIT DESCRIPTION
The No. 2 vehicle speed sensor detects the rotation speed of the transmissi\
on output shaft and sends sig-
nals to the ECM. The ECM determines the vehicle speed based on these signals\
.
An AC voltage is generated in the No. 2 vehicle speed sensor coil as the r\
otor mounted on the output shaft
rotates, and this voltage is sent to the ECM.
The gear shift point and lock −up timing are controlled by the ECM based on the signals from this vehic\
le
speed sensor and the throttle position sensor signal.
If the No. 2 vehicle speed sensor malfunctions, the ECM uses input signa\
ls from the No. 1 vehicle speed
sensor as a back −up signal.
DTC No.DTC Detecting ConditionTrouble Area
P1700
All conditions below are detected 500 times or more continu-
ously (2 trip detection logic)
(a) No signal from No. 2 vehicle speed sensor is input to ECM while 4 pulses of No. 1 vehicle speed sensor signal is sent
(b) Vehicle speed: 9 km/h (5.6 mph) or more for as least 4 sec.
(c) Park/neutral position switch: OFF (Other than P or N posi-
tion)
(d) Transfer position: Other than N position
 Open or short in No. 2 vehicle speed sensor circuit
 No. 2 vehicle speed sensor
 ECM
Reference:
Waveform between terminals SP2
+ and SP2− when the vehicle
speed is approx. 60 km/h (37 mph).
DI5KW−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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EM−2
−
ENGINE MECHANICAL CO/HC
505
Author: Date:
1996 LAND CRUISER (RM451U)
6. TROUBLESHOOTING
If the CO/HC concentration does not comply with regulations,
troubleshoot in the order given below.
See the table below for possible causes, and then inspect and
correct the applicable causes if necessary.
COHCProblemsCauses
NormalHighRough idle
3. Faulty ignitions:
Incorrect timing
 Fouled, shorted or improperly gapped plugs
 Open or crossed high −tension cords
 Cracked distributor cap
4. Incorrect valve clearance
5. Leaky EGR valve
6. Leaky intake and exhaust valves
7. Leaky cylinders
LowHighRough idle
(Fluctuating HC reading)
1. Vacuum leaks:
 PCV hose
 EGR valve
 Intake manifold
 Air intake chamber
 Throttle body
 IAC valve
 Brake booster line
2. Lean mixture causing misfire
HighHighRough idle
(Black smoke from exhaust)
1. Restricted air filter
2. Faulty SFI systems:
 Faulty pressure regulator
 Clogged fuel return line
 Defective ECT sensor
 Faulty ECM
 Faulty injector
 Faulty throttle position sensor
 Faulty MAF meter
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EM1Q4−01
P05120A16078
1 Dot Mark
EM−4
−
ENGINE MECHANICAL VALVE CLEARANCE
507
Author: Date:
1996 LAND CRUISER (RM451U)
VALVE CLEARANCE
INSPECTION
HINT:
Inspect and adjust the valve clearance when the engine is cold.
1. DRAIN ENGINE COOLANT
2. REMOVE THROTTLE BODY (See page SF−45)
3. DISCONNECT ENGINE WIRE AND HEATER VALVE FROM COWL PANEL
(a) Remove the 2 bolts and disc onnect the ground strap and
engine wire.
(b) Remove the 2 bolts and disconnect the heater valve.
4. DISCONNECT HIGH −TENSION CORDS FROM SPARK
PLUGS (See page IG−1 )
5. REMOVE CYLINDER HEAD COVER
Remove the 13 bolts, cylinder head cover and gasket.
6. SET NO. 1 CYLINDER TO TDC/COMPRESSION
(a) Turn the crankshaft pulley, and align its groove with the timing mark ”0” of the timing chain cover.
(b) Check that the timing marks (1 and 2 dots) of the camshaft
drive and driven gears are in straight line on the cylinder
head surface as shown in the illustration.If not, turn the
crankshaft 1 revolution (360 °) and align the marks as
above.
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−
ENGINE MECHANICAL VALVE CLEARANCE
EM−5
508
Author: Date:
1996 LAND CRUISER (RM451U)
7. INSPECT VALVE CLEARANCE
(a) Check only the valves indicated.
Using a thickness gauge, measure the clearance
between the valve lifter and camshaft.
Record the out−of−specification valve clearance
measurements. They will be used later to determine
the required replacement adjusting shim.
Valve clearance (Cold):
Intake0.15 − 0.25 mm (0.006 − 0.010 in.)
Exhaust0.25 − 0.35 mm (0.010 − 0.041 in.)
(b) Turn the crankshaft pulley 1 revolution (360 °) and align
the its groove with timing mark ”0” of the timing chain cov-
er.
(c) Check only the valves indicated as shown. Measure the valve clearance (See procedure in step (a) above).
8. Except for rear valves of No. 6 cylinder ADJUST VALVE CLEARANCE
(a) Remove the adjusting shim.
Turn the crankshaft to position the cam lobe of the
camshaft on the adjusting valve upward.
Position the notch of the valve lifter toward the spark
plug side.
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