1996 TOYOTA LAND CRUISER Pg 780

IN04P−14
Z04707
AB
P03780
−
INTRODUCTION IDENTIFICATION INFORMATION
IN−3
3
Author: Date:
1996 LAND CRUISER (RM451U)
IDENTIFICATION INFORMATION
VEHICLE IDENTIFICATION AND
ENGINE SERIAL NUMBER
1. VEHICLE IDENTIFICATION NUMBER
The vehicle identification number is stamped on the vehicle
identification number plate and the certification label, as shown
in the illustration. A: Vehicle Identification Number Plate
B: Certification Label
2. ENGINE SERIAL NUMBER
The engine serial number is stamped on the engine block, as
shown in the illustration.
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Z17808
Fig. 7Sensor 21 A
B1
C
1
1
221 2
B2
ECU
IN0383
Example
Ground
IN0384
Ground
Ground
ECU Side
W/H Side
IN−32
−
INTRODUCTION HOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS
1996 LAND CRUISER (RM451U)
(2) Disconnect connector ”B” and measure the resis-
tance between terminal 1 of connector ”A” and body
ground, and terminal 1 of connector ”B2” and body
ground.
In the case of Fig. 7:
Between terminal 1 of connector ”A” and body
ground → No continuity
Between terminal 1 of connector ”B2” and body
ground → Continuity (short)
Therefore, it is found out that there is a short circuit
between terminal 1 of connector ”B2” and terminal
1 of connector ”C”.
8. CHECK AND REPLACE ECU
First check the ECU ground circuit. If it is faulty, repair it. If it is
normal, the ECU could be faulty, so replace the ECU with a nor-
mal functioning one and check that the symptoms appear.
(1) Measure the resistance between the ECU groundterminal and the body ground.
Resistance: 1 Ω or less
(2) Disconnect the ECU connector, check the ground terminals on the ECU side and the wire harness
side for bend and check the contact pressure.
o
D~~~D~~~
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−
DIAGNOSTICS ENGINE
DI−15
1996 LAND CRUISER (RM451U)
DTC No.
(See Page)
Detection ItemTrouble Area*MILMemory
P0420
( DI−84 )Catalyst System Efficiency
Below Threshold Three− way catalytic convertor
 Open or short in heated oxygen sensor circuit
 Heated oxygen sensor

P0500
( DI−87 )Vehicle Speed Sensor
Malfunction
Combination meter
 Open or short in speed sensor circuit
 ECM
 Vehicle speed sensor

P0505
( DI−89 )Idle Control System
Malfunction
IAC valve is stuck or closed
 Open or short in IAC valve circuit
 Open or short A/C signal circuit
 Air intake (hose loose)

P0510
( DI−93 )Closed Throttle Position
Switch MalfunctionOpen in closed throttle position switch circuit
 Closed throttle position switch
 ECM

P1300
( DI−97 )Igniter Circuit Malfunction
Open or short in IGF or IGT circuit from igniter to ECM
 Igniter
 ECM

P1335
( DI−102 )Crankshaft Position Sensor
Circuit Malfunction
(during engine running)
Open or short in crankshaft position sensor circuit for NE sig-
nal
 Crankshaft position sensor for NE signal
 Starter
 ECM
−
P1500
( DI−103 )Stater signal circuit MalfunctionOpen or short in starter signal circuit
 ECM−
P1600
( DI−105 )ECM BATT MalfunctionOpen in back up power source circuit
 ECM
P1605
( DI−107 )Knock Control CPU MalfunctionECM
P1780
( DI−108 )Park/Neutral Position Switch
MalfunctionShort in park/neutral position switch circuit
 Park/neutral position switch
 ECM

*: −  MIL does not light up,   MIL lights up
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A00176
ONSPD
(+)
(−)
BE6653
P24668
AT7809
9 − 14 V
0
Turn the wheel
DI−88
−
DIAGNOSTICS ENGINE
1996 LAND CRUISER (RM451U)
INSPECTION PROCEDURE
1 Check operation of speedometer.
CHECK:
Drive the vehicle and check if the operation of the speedmeter in the co\
mbination meter is normal.
HINT:
The vehicle speed sensor is operating normally if the speedometer displa\
y is normal.
NG Check speedometer circuit (See page BE−2 ).
OK
2 Check voltage between terminal SPD of ECM connector and body ground.
PREPARATION:
(a) Remove instrument panel speaker No.1 panel (See page SF−65 ).
(b) Disconnect cruise control ECU connector.
(c) Shift the shift lever to neutral.
(d) Jack up a rear wheels on one side.
(e) Turn ignition switch ON.
CHECK:
Measure voltage between terminal SPD of ECM connector and
body ground when the wheel is turned slowly.
OK:
Voltage is generated intermittently.
NG Check and repair harness and connector between combination meter and ECM.
OK
Check and replace ECM (See page IN−28 ).
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P22478
Battery
FL AM1
Fusible Link
1F6
B−L
2
2 2
2
3
4
AM1
R/B No.2
Junction
Connector (J4)
Y Y
IG Switch
4 2
1 B−W
B−YFuse Block
GAUGE
Y
B
B 6IH14
B−W Park/Neutral
Position Switch
3
2 G−R G−W
O
O
IH2
To A/T Indicator Light
(Combination Meter)
Starter
1
S1 E7
E7
E7
17
16
22 NSW
E1B+
E1 E1
L
2 ECM
W
EA26
B
B
B−R
65 3
2IH1
21
B−W
IH2
DI−108
−
DIAGNOSTICS ENGINE
1996 LAND CRUISER (RM451U)
DTC P1780 Park/Neutral Position Switch Malfunction
CIRCUIT DESCRIPTION
The park/neutral position switch goes on when the shift lever is in the N o\
r P shift position. When it goes on
terminal NSW of the ECM is grounded to body ground via the starter relay, thus the terminal NSW voltage
becomes 0 V. When the shift lever is in the D, 2, L or R position, the park/neutral\
position switch goes off,
so the voltage of ECM, terminal NSW becomes battery voltage, the voltage of the ECM internal power
source. If the shift lever is moved from the N position to the D position, this signal is used for air\
−fuel ratio
correction and for idle speed control (estimated control), etc.
DTC No.DTC Detecting ConditionTrouble Area
P1780
2 or more switches are ON simultaneously for ”N”, ”2” and ”\
L”
position (2 trip detection logic)
 Short in park/neutral position switch circuit
 Park/neutral position switch
 ECMWhen driving under conditions (a) and (b) for 30 sec. or more
the park/neutral position switch is ON (N position):
(2 trip detection logic)
(a) Vehicle speed: 70 km/h (44 mph) or more
(b) Engine speed: 1,500 − 2,500 rpm
HINT:
After confirming DTC P1780 use the T OYOTA hand−held tester to confirm the PNP switch signal from ”CUR-
RENT DATA”.
WIRING DIAGRAM
DI5PV−02
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DI5KB−03
−
DIAGNOSTICS AUTOMATIC TRANSMISSION
DI−143
1996 LAND CRUISER (RM451U)
DIAGNOSTIC TROUBLE CODE CHART
If a DTC is displayed during the DTC check, check the circuit listed for that code i\
n the table below and pro-
ceed to the page given.
DTC No.
(See page)Detection ItemTrouble AreaMIL*Memory
P0500
( DI−153 )Vehicle Speed Sensor Malfunc-
tion
(No. 1 Vehicle Speed Sensor)Open or short in No. 1 vehicle speed sensor circuit
 No. 1 vehicle speed sensor
 ECM

P0710
( DI−154 )Transmission Fluid Temperature
Sensor Malfunction
(ATF Temperature Sensor) Open or short in ATF temperature sensor circuit
 ATF temperature sensor
 ECM

P0750
( DI−156 )Shift Solenoid A Malfunction
(Shift Solenoid Valve No. 1)Shift solenoid valve No. 1 is stuck open or closed
 Valve body is blocked up or stuck
P0753
( DI−157 )Shift Solenoid A Electrical
Malfunction
(Shift Solenoid Valve No. 1)Open or short in shift solenoid valve No. 1 circuit
 Shift solenoid valve No. 1
 ECM

P0755
( DI−156 )Shift Solenoid B Malfunction
(Shift Solenoid Valve No. 2)Shift solenoid valve No. 2 is stuck open or closed
 Valve body is blocked up or stuck
P0758
( DI−157 )Shift Solenoid B Electrical
Malfunction
(Shift Solenoid Valve No. 2)Open or short in shift solenoid valve No. 2 circuit
 Shift solenoid valve No. 2
 ECM

P0770
( DI−161 )Shift Solenoid E Malfunction
(Shift Solenoid Valve SL)Shift solenoid valve SL is stuck open or closed
 Valve body is blocked up or stuck
 Lock− up clutch

P0773
( DI−163 )Shift Solenoid E Electrical
Malfunction
(Shift Solenoid Valve SL)Open or short in shift solenoid valve SL circuit
 Shift solenoid valve SL
 ECM

P1700
( DI−166 ) Speed Sensor No. 2 Circuit
Malfunction
(No. 2 Vehicle Speed Sensor)Open or short in No. 2 vehicle speed sensor circuit
 No. 2 vehicle speed sensor
 ECM

P1780
( DI−169 )Park/Neutral Position Switch
MalfunctionShort in park/neutral position switch circuit
 Park/neutral position switch
 ECM

*:  ...MIL light up
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Q08577D00180
ECM
Combination Meter
Battery
Park/Neutral
Position Switch
Fuse Block
Starter
From
Battery L
2
R
NSW
E717
16 15
C12
G−W
E7E7
E7
L
R
2
C12
C12
R−B R−B
G−W
O
O
IH2
B−W 22
43
1
2B−W
IG1
ST1 2 4
AM1
2
2
2 2
1
2
AM1
3
J4
EA2 1 8
GAUGE
W
B F6
FLAM1
B+
IH2
IH1 IH1
B−L
B
6
Ignition Switch
4 R/B No. 2
6
6
B
B
Y
Y
15
B−R
B−WO
G−R R−B
S1
S2
10 4
11
2
3
21 7
Y
B−Y 1
−
DIAGNOSTICS AUTOMATIC TRANSMISSION
DI−169
1996 LAND CRUISER (RM451U)
DTC P1780 Park/Neutral Position Switch Malfunction
CIRCUIT DESCRIPTION
The park/neutral position switch detects the shift lever position and sends\
signals to the ECM.
The ECM receives signals (NSW, R, 2 and L) from the park/neutral position switch. When the signal is\
not
sent to the ECM from the park/neutral position switch, the ECM judges th\
at the shift lever is in D position.
DTC No.DTC Detection ConditionTrouble Area
P1780
2 or more switches are ON simultaneously for N, 2 and L posi-
tions (2 trip detection logic)
Short in park/neutral position switch circuit
 Park/neutral position switch
 ECMWhen driving under conditions (a), (b) and (c) for 30 sec. or
more, the park/neutral position switch is ON (N position)
(2 trip detection logic)
(a) Vehicle speed: 70 km/h (44 mph) or more
(b) Engine speed: 1,500 − 2,500 rpm
(c) Engine load: 0.6 g/rev. or more
WIRING DIAGRAM
DI5KY−02
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R05038
780  30 mm
30.71  1.18 in.
BR1865
0.13 sec.
0.13 sec.
ON
OFF
R05596
0.13 sec.
Braking
0.13 sec.
R05597
0.13 sec. 0.13 sec.
Braking
DI−194
−
DIAGNOSTICS ANTI−LOCK BRAKE SYSTEM
1996 LAND CRUISER (RM451U)
(9) Jack up the front side of the vehicle slowly, as
shown.
HINT:
When measuring the height, measure at the center of the lower
body of the vehicle. (10) Check that the warning light blinks.
If the warning light turns on, inspect the deceleration sensor
installation. If the sensor installation is OK, replace the decel-
eration sensor.
(11) Jack down the vehicle slowly.
(c) Deceleration sensor operation check. (1) Drive the vehicle straight ahead at about 20 km/h
(12.4 mph) or more, lightly depress the brake pedal.
(2) Check that there is no change in the warning light pattern.
(3) Drive the vehicle straight ahead at about 20 km/h (12.4 mph) or more, and depress the brake pedal
moderately.
(4) Check that the warning light turns on while braking.
(5) Drive the vehicle straight ahead at about 20 km/h (12.4 mph) or more, and depress the brake pedal
strongly.
(6) Check that the warning light pattern changes while braking, as shown.
If the operation is not as specified, inspect the deceleration sen-
sor installation. If the sensor installation is OK, replace the de-
celeration sensor. (7) Stop the vehicle and turn the ignition switch OFF.
(8) Remove SST from the terminals Ts and E
1 of the
DLC1.
SST 09843−18020
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