1996 TOYOTA LAND CRUISER ECU

I00490
Cruise Control ECUVR1 VR2
VR3
23
24
25
Y
Y−G Y−L
1
2 3
C4
Cruise Control Actuator
C17
C17 C17
C4
C4
−
DIAGNOSTICS CRUISE CONTROL SYSTEM
DI−301
1996 LAND CRUISER (RM451U)
DTC 13 Actuator Position Sensor Circuit
CIRCUIT DESCRIPTION
The circuit detects the rotation position of the actuator control plate and\
sends a signal to the ECU.
DTC No.Detection ItemTrouble Area
13Position sensor detects abnormal voltage.
Actuator position sensor
 Harness or connector between cruise control ECU and
actuator position sensor
 Cruise control ECU
WIRING DIAGRAM
DI5OD−02
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AB0119
I00135I00130
I00161VR2
VR3
ON
Fully Close Side
Fully Open Side
Control Plate
(−)
(+)
I00006
1
3
DI−302
−
DIAGNOSTICS CRUISE CONTROL SYSTEM
1996 LAND CRUISER (RM451U)
INSPECTION PROCEDURE
1 Check resistance between terminals VR2 and VR3 of cruise control ECU connec-
tor.
PREPARATION:
(a) Remove the ECU with connectors still connected.
(b) Turn ignition switch OFF.
CHECK:
Measure voltage between terminals VR2 and VR3 of ECU con-
nector while turning control plate slowly by hand from the decel-
eration side to the acceleration side.
OK:
Voltage:
Fully closed: Approx. 1.3 V
Fully opened: Approx. 4.1 V
In addition, as the control plate is turned, the voltage
should increase gradually without interruption.
NG Proceed to next circuit inspection shown on problem symptoms table (See page DI−295 ).
OK
2 Check resistance between terminals VR1 and VR3 of actuator position sens\
or.
PREPARATION:
(a) Turn ignition switch OFF.
(b) Disconnect the actuator connector.
CHECK:
Measure resistance between actuator terminal 1 and 3 of ac-
tuator connector.
OK:
Resistance: 1.8 − 2.2 kΩ (25 °C)
NG Replace cruise control actuator.
OK
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I00007
23
−
DIAGNOSTICS CRUISE CONTROL SYSTEM
DI−303
1996 LAND CRUISER (RM451U)
3 Check voltage between terminals VR2 and VR3 of actuator position sensor.
PREPARATION:
(a) Turn ignition switch ON.
(b) Connect the actuator connector.
CHECK:
Measure voltage between terminals 2 and 3 of actuator con-
nector while turning control plate slowly by hand from the decel-
eration side to the acceleration side.
OK:
Voltage: 1.3 − 4.0 V
HINT:
As the control plate is turned, the voltage should increase grad-
ually without interruption.
NG Replace cruise control actuator.
OK
4 Check for open and short in harness and connector between cruise control\
ECU and actuator position sensor (See page IN−28).
NG Repair or replace harness or connector.
OK
Check and replace cruise control ECU
(See page IN−28 ).
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I00054
54
(+)
(−)
DI−304
−
DIAGNOSTICS CRUISE CONTROL SYSTEM
1996 LAND CRUISER (RM451U)
DTC 14 Actuator Mechanical Malfunction
CIRCUIT DESCRIPTION
The circuit detects the rotation position of the actuator control plate and\
sends a signal to the ECU.
DTC No.Detection ItemTrouble Area
14
 Open in actuator motor circuit.
 Position sensor signal valve does not change when the
motor operates.
Actuator lock: (motor, arm)
 Actuator motor
 Harness or connector between cruise control ECU and
actuator motor
 Cruise control ECU
WIRING DIAGRAM
See page DI−296 .
INSPECTION PROCEDURE
1 Check cruise control actuator arm locking operation
PREPARATION:
(a) Turn ignition switch OFF.
(b) Disconnect the actuator connector.
CHECK:
(a) Connect the positive (+) lead from the battery to the termi-
nal 5 of actuator and the negative ( −) lead to terminal 4.
NOTICE:
Do not connect the high tension cables to the wrong bat-
tery terminal. You will damage the cruise control actuator.
(b) Move the control plate by hand.
OK:
Control plate does not move.
NG Replace cruise control actuator.
OK
DI5OE−02
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I00131
I00132I00008
I00010
I00132
Fully open side
Control plate Fully close side
Control Plate 4
5
674
6
5
7
−
DIAGNOSTICS CRUISE CONTROL SYSTEM
DI−305
1996 LAND CRUISER (RM451U)
2 Check cruise control actuator operation.
PREPARATION:
(a) Turn ignition switch OFF.
(b) Disconnect the actuator connector.
CHECK:
Connect the positive (+) lead from the battery to terminals 5 and
6 of actuator, connect the negative (−) lead to terminals 4 and
7 of actuator.
OK:
Control arm moves to full open side
CHECK:
Connect the positive (+) lead from the battery to terminals 4 and
7of actuator, connect the negative ( −) lead to terminals 5 and
6 of actuator.
OK:
Control arm moves to full colse side
NG Replace cruise control actuator.
OK
3 Check harness and connector between cruise control ECU and cruise contro\
l ac- tuator (See page IN−28 ).
NG Repair or replace harness or connector.
OK
Check and replace cruise control ECU (See
page IN−28 ).
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I00414ECTOD/TRIP METER
Cruise Control ECU
4 pulse/
1 rotation
of rotor shaft 4 pulse/
1 rotation
of rotor shaft
Vehicle Speed Sensor
DI−306
−
DIAGNOSTICS CRUISE CONTROL SYSTEM
1996 LAND CRUISER (RM451U)
DTC 21 Open in Vehicle Speed Sensor Circuit
CIRCUIT DESCRIPTION
The vehicle speed sensor circuit is sent to cruise control ECU as vehicle s\
peed signal.
The rotor shaft is driven by the gear of the transmission.
For each rotation of the shaft, the vehicle speed sensor sends a 4 pulse si\
gnal through the combination me-
ter to the cruise control ECU (See the following).
This signal is converted inside the combination meter and sent as a 4 −pulse signal to the cruise control ECU.
The ECU calculates the vehicle speed from this pulse frequency.
DTC No.Detection ItemTrouble Area
21 Speed signal is not input to the cruise control ECU while
cruise control is set.
Combination meter
 Harness or connector between cruise control ECU and com-
bination meter, combination meter and vehicle speed sensor
 Vehicle speed sensor
 Cruise control ECU
DI5OF−02
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I00491
Cruise Control ECU
C17
Speedometer
(Combination Meter)
C13
C13
4 3
Vehicle Speed Sensor (Combination Meter) R−O
R−O
R−G
R−G 25
1
Ea1EC1
IH1L−W
BR Air Intake Chamber
EC
V1
V1
V13 2
1
1
Ea1 EC1
3 6
Y
Y GAUGE
AM1
Y
Y
BR
BR
EC1
Ea1 IH1
22
Instrument Panel Fuse
Block
Fusible Link BatteryWB
B
I12
I12
Ignition Switch 2
4
1
3
F11
F11Y
B
B
J4
JUNCTION
CONNECTOR
EA1
6
2
2 3
4
B−L
FL MAIN
F6
1 B−Y
39
20
SPD
−
DIAGNOSTICS CRUISE CONTROL SYSTEM
DI−307
1996 LAND CRUISER (RM451U)
WIRING DIAGRAM
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Input SignalIndicator Light
Blinking Pattern
Drive at about
40 km/h (25 mph)
or below
Drive at about
40 km/h (25 mph)
or higher Light
ON
OFF
Light ON
OFF
DI−308
−
DIAGNOSTICS CRUISE CONTROL SYSTEM
1996 LAND CRUISER (RM451U)
INSPECTION PROCEDURE
1 Input signal check.
CHECK:
(a) See input signal check on page DI−286.
(b) Check indicator light operation when driving with vehicle speed above 40 km/h (25 mph), and with vehicle speed
below 40 km/h (25 mph).
OK:
Vehicle speed above 40 km/h (25 mph):
Indicator light blinks
Vehicle speed below 40 km/h (25 mph):
Indicator light stays on
OK Check and replace cruise control ECU (See page IN−28 ).
NG
2 Check speedometer circuit (See Combination meter troubleshooting on pag\
e BE−34 ).
NG Repair or replace harness, connector or com-
bination meter assembly.
OK
3 Check harness and connector between cruise control ECU and combination m\
e- ter, combination meter and vehicle speed sensor (See page IN−28 ).
NG Repair or replace harness or connector.
OK
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