1996 TOYOTA LAND CRUISER Land Cruiser 80

N14305
N14305
N14305
-
DIAGNOSTICS CRUISE CONTROL SYSTEM
DI-288
1996 LAND CRUISER (RM451U)
4. PROBLEM SYMPTOM CONFIRMATION (ROAD TEST)
(a) Inspect the SET switch.
(1) Push the main switch ON.
(2) Drive at a desired speed (40 km/h (25 mph) or high-
er).
(3) Press the control switch to the SET/COAST.
(4) After releasing the switch, check that the vehicle cruises at the desired speed.
(b) Inspect the ACCEL switch. (1) Push the main switch ON.
(2) Drive at a desired speed (40 km/h (25 mph) or high-
er).
(3) Check that the vehicle speed is increased while the control switch turned to RES/ACC, and that the ve-
hicle cruises at the set speed when the switch is re-
leased.
(4) Momentarily press the control switch upward in the RES/ACC and then immediately release it. Check
that the vehicle speed increases by about 1.5 km/h
(Tap-up function).
(c) Inspect the COAST switch. (1) Push the main switch ON.
(2) Drive at a desired speed (40 km/h (25 mph) or high-er).
(3) Check that the vehicle speed is decreased while the
control switch is turned to SET/COAST, and the ve-
hicle cruise at the set speed when the switch is re-
leased.
(4) Momentarily press the control switch is turned to SET/COAST, and then immediately release it.
Check that the vehicle speed decreases by about
1.5 km/h (Tap-down function).
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N14305
N14305
DI-289
-
DIAGNOSTICS CRUISE CONTROL SYSTEM
1996 LAND CRUISER (RM451U)
(d) Inspect the CANCEL switch. (1) Push the main switch ON.
(2) Drive at a desired speed (40 km/h (25 mph) or high-er).
(3) When operating one of the followings, check that the cruise control system is cancelled and that the
normal driving mode is reset.

Depress the brake pedal

Shift to except D position

Push the main switch OFF

Pull the cruise control switch to CANCEL
(e) Inspect the RESUME switch. (1) Push the main switch ON.
(2) Drive at a desired speed (40 km/h (25 mph) or high-er).
(3) When operating one of the followings, check that
the cruise control system is cancelled and that the
normal driving mode is reset.

Depress the brake pedal

Shift to except D position

Pull the cruise control switch to CANCEL
(4) After the control switch is turned to RES/ACC at the driving speed of more than 40 km/h (25 mph), check
that the vehicle restores the speed prior to the can-
cellation.
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N14305
(1)
(1) (2)
No.
Operation Method CRUISE MAIN Indicator Light
Blinking Pattern Diagnosis
1 Turn SET/COAST switch ON
2 Turn RES/ACC switch ON
3 Turn CANCEL switch ON
Turn stop light switch ON
Depress brake pedal
Turn PNP switch OFF
(Shift to except D position)
4 Drive at about 40 km/h
(25 mph)or higher
Drive at about 40 km/h
(25 mph) or below
Light
ON
OFF
Light ON
OFF
Light ON
OFF Switch ON
Switch OFF
LightON
OFF Switch OFF
Switch ONSET/COAST switch circuit
is normal
RES/ACC switch circuit
is normal
CANCEL switch circuit
is normalStop light switch circuit
is normal
PNP switch circuit is
normal
Vehicle Speed Sensor is
normal
Light ON
OFF
Light
ON
OFF
1sec.
0.25 sec. 0.25 sec.
-
DIAGNOSTICS CRUISE CONTROL SYSTEM
DI-290
1996 LAND CRUISER (RM451U)
5. INPUT SIGNAL CHECK
HINT:
(1) For check No.1 - No.3

Turn ignition switch ON.
(2) For check No.4

Jack up the vehicle.

Start the engine.

Shift to D position.
(a) Press the control switch to SET/COAST or RES/ACC position and hold it down or hold it up º1º.
(b) Push the main switch ON º2º.
(c) Check that the CRUISE MAIN indicator light blinks twice or 3 times repeatedly after 3 seconds.
(d) Turn the SET/COAST or RES/ACC switch OFF.
(e) Operate each switch as listed in the table below.
(f) Read the blinking pattern of the CRUISE MAIN indicator light.
(g) After performing the check, turn the main switch OFF.
HINT:
When 2 or more signals are input to the ECU, the lowest num-
bered code will be displayed first.
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DI5O7−02
−
DIAGNOSTICS CRUISE CONTROL SYSTEM
DI−291
1996 LAND CRUISER (RM451U)
DIAGNOSTIC TROUBLE CODE CHART
If a malfunction code is displayed during the DTC check, check the circuit listed for that cod\
e in the table
below and proceed to the appropriate page.
DTC No.
(See Page)Circuit inspectionTrouble Area
11
( DI−296 )Actuator Motor Circuit
Actuator motor
 Harness or connector between cruise control ECU and
actuator motor
 Cruise control ECU
12
( DI−298 )Actuator Magnetic Clutch Circuit
STOP Fuse
 Stop light switch
 Actuator magnetic clutch
 Harness or connector between cruise control ECU and
actuator magnetic clutch, actuator magnetic clutch and body
ground
 Cruise control ECU
13
( DI−301 )Actuator Position Sensor Circuit
Actuator position sensor
 Harness or connector between cruise control ECU and
actuator position sensor
 Cruise control ECU
14
( DI−304 )Actuator Mechanical Malfunction
Actuator motor (actuator lock: motor, arm)
 Harness or connector between cruise control ECU and
actuator motor
 Cruise control ECU
21
( DI−306 )Open in Vehicle Speed Sensor Circuit
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
23
( DI−310 )Vehicle Speed Signal AbnormalVehicle speed sensor
 Cruise control ECU
32
( DI−311 )Control Switch Circuit
Cruise control switch
 Harness or connector between cruise control ECU and cruise
control switch, cruise control switch and body ground
 Cruise control ECU
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DI5O8−02
I00756
DLC1
Cruise Control Actuator
 Actuator Motor
 Actuator Magnetic Clutch
 Actuator Position Sensor
Cruise Control ECU
Cruise Control Switch
 Main Switch
 Control Switch
Stop Light Switch
No.1 V ehicle Speed Sensor
Park/Neutral Position Switch
Instrument Panel Fuse Block

GAUGE Fuse
 ECU−IG Fuse
 ECU− B Fuse
DI−292
−
DIAGNOSTICS CRUISE CONTROL SYSTEM
1996 LAND CRUISER (RM451U)
PARTS LOCATION
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DI5O9−02
I00410
C18
Vd−26−2−E
−
DIAGNOSTICS CRUISE CONTROL SYSTEM
DI−293
1996 LAND CRUISER (RM451U)
TERMINALS OF ECM
Symbols (Terminals No.)Wiring ColorConditionSTD Voltage (V)
D ↔ GND (C18 −2 ↔ C18− 13)B−W ↔ BRShift to except D positionBelow 1 V
Shift to D position10 − 16 V
PI ↔ GND (C18 −7 ↔ C18− 13)G−Y ↔ BR
Ignition switch ON
Cruise control main switch ONBelow 1.2 V
Ignition switch ON
Cruise control main switch OFF10 − 16 V
TC ↔ GND
(C18− 8 ↔ C18− 13)B−Y ↔ BR
Ignition switch ON10 − 16 V
Ignition switch ON
Connect terminals TC and E1 of diagnostic check connectorBelow 1 V
OD ↔ GND
(C18− 9 ↔ C18− 13)G−O ↔ BR
During cruise control driving
OD switch ON.10 − 16 V
During cruise control driving
OD switch OFF (3rd driving)Below 1 V
L ↔ GND
(C18− 10 ↔ C18− 13)R ↔ BRDuring cruise control driving9 − 15 V
Except during cruise control drivingBelow 1 V
MC ↔ GND
(C18−11 ↔ C18− 13)L− R ↔ BR
During cruise control driving
COAST switch hold ON9 − 15 V
During cruise control driving
ACC switch hold ONBelow 1 V
MO ↔ GND
(C18− 12 ↔ C18− 13)L ↔ BR
During cruise control driving
ACC switch hold ON9 − 15 V
During cruise control driving
COAST switch hold ONBelow 1 V
GND ↔ Body Ground
(C18− 13 ↔ Body Ground)BR ↔ Body
GroundConstantBelow 1 V
B ↔ GND
(C18− 14 ↔ C18− 13)B−W ↔ BRIgnition switch ON10 − 16 V
BATT ↔ GND
(C18− 15 ↔ C18− 13)B−R ↔ BRConstant10 − 16 V
STP− ↔ GND
(C18− 16 ↔ C18− 13)G−W ↔ BRDepress brake pedal10 − 16 V
Release brake pedalBelow 1 V
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DI−294
−
DIAGNOSTICS CRUISE CONTROL SYSTEM
1996 LAND CRUISER (RM451U)
Symbols (Terminals No.)
Wiring ColorConditionSTD Voltage (V)
CCS ↔
GND
(C18− 18 ↔ C18− 13)B−G ↔ BR
Ignition switch ON10 − 16 V
Ignition switch ON
CANCEL switch hold ON5.1 − 8.3 V
Ignition switch ON
SET/COAST switch hold ON2.4 − 4.0 V
Ignition switch ON
RES/ACC switch hold ON0.8 − 1.4 V
CMS ↔ GND
(C18− 19 ↔ C18− 13)Y−R ↔ BR
Ignition switch ON
Main switch ONBelow 1 V
Ignition switch ON
Main switch OFF10 − 16 V
SPD ↔ GND
(C18− 20 ↔ C18− 13)L− W ↔ BRIgnition switch ON4.7 − 5.2 V
During driving3 − 7 V
IDL ↔ GND
(C18− 21 ↔ C18− 13)G−W ↔ BR
Ignition switch ON
Throttle valve fully closedBelow 1 V
Ignition switch ON
Throttle valve fully opened10 − 16 V
ECT ↔ GND
(C18− 22 ↔ C18− 13)
ECT ↔ GND
(C18− 22 ↔ C18− 13)
G−R ↔ BR
During driving
Gear position O/DBelow 1 V
During driving
Gear position 3rd10 − 16 V
VR1 ↔ GND
(C18− 23 ↔ C18− 13)Y ↔ BRIgnition switch ON4.7 − 5.2 V
VR2 ↔ VR3
(C18− 24 ↔ C18− 25)Y−G ↔ Y−L
During cruise control driving1.0 − 4.7 V
Ignition switch ON
Actuator control plate fully opened4.2 − 4.7 V
Ignition switch ON
Actuator control plate fully closed1.0 − 1.2 V
VR3 ↔ GND
(C18− 25 ↔ C18− 13)Y−L ↔ BRConstantBelow 1 V
L− ↔ GND
(C18− 26 ↔ C18− 13) ↔ BRConstantBelow 1 V
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DI5OA−02
−
DIAGNOSTICS CRUISE CONTROL SYSTEM
DI−295
1996 LAND CRUISER (RM451U)
PROBLEM SYMPTOMS TABLE
SymptomSuspect AreaSee page
SET not occourring or CANCEL occurring.
(DTC is Normal)
1. Main Switch Circuit (Cruise control switch)
2. Vehicle Speed Sensor
3. Control Switch Circuit (Cruise control switch)
4. Stop Light Switch Circuit
5. Park/Neutral Position Switch Circuit
6. Actuator Motor Circuit
7. Cruise Control Cable
8. Cruise Control ECUDI−330
DI−306
DI−311
DI−314
DI−322
DI−296
DI−336 IN−28
SET not occurring or CANCEL occurring.
(DTC does not output)1. ECU Power Source Circuit
2. Cruise Control ECUDI−325IN−28
Actual vehicle speed deviates above or below the set speed.
1. Cruise Control Cable
2. Vehicle Speed Signal Abnormal
3. Electronically Controlled Transmission Communication
Circuit
4. Actuator Motor Circuit
5. Idle Signal Circuit (main throttle position sensor)
6. Cruise Control ECUDI−336
DI−310
DI−319
DI−296
DI−316IN−28
Gear shifting frequent between 3rd O/D when driving on uphill
road. (Hurting)1. Electronically Controlled Transmission Communication
Circuit
2. Cruise Control ECUDI−319
IN−28
Cruise control not cancelled, even when brake pedal is de-
pressed.
1. Cruise Control Cable
2. Stop Light Switch Circuit
3. Actuator Motor Circuit
4. Cruise Control ECUDI−336
DI−314
DI−296IN−28
Cruise control not cancelled, even when transmission is shifted to
”N” postion.
1. Cruise Control Cable
2. Park/Neutral Position Switch Circuit
3. Actuator Motor Circuit
4. Cruise Control ECUDI−336
DI−322
DI−296IN−28
Control switch does not operate.
(SET/COAST, A CC/RES, CANCEL not possible)
1. Cruise Control Cable
2. Control Switch Circuit
3. Actuator Motor Circuit
4. Cruise Control ECUDI−336
DI−311
DI−296 IN−28
SET possible at 40 km/h (25 mph) or less, or CANCEL does not
operate at 40 km/h (25 mph) or less.
1. Cruise Control Cable
2. Vehicle Speed Signal Abnormal
3. Actuator Motor Circuit
4. Cruise Control ECUDI−336
DI−310
DI−296IN−28
Poor response is ACCEL and RESUME modes.
1. Cruise Control Cable
2. Electronically Controlled Transmission Communication
Circuit
3. Actuator Motor Circuit
4. Cruise Control ECUDI−336
DI−319
DI−296IN−28
O/D does not RESUME, even though the road is not uphill.
1. Electronically Controlled Transmission Communication
Circuit
2. Cruise Control ECUDI−319
IN−28
DTC memory is erased.1. Back− up Power Source Circuit
2. Cruise Control ECUDI−328 IN−28
DTC is not output, or is output when is should not be.1. Diagnosis Circuit
2. Cruise Control ECUDI−319IN−28
Cruise MAIN indicator light remains ON or fall to light up.1. Cruise MAIN Indicator Light Switch CircuitDI−332
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