1996 TOYOTA LAND CRUISER Cruise control

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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−
DIAGNOSTICS CRUISE CONTROL SYSTEM
DI−309
1996 LAND CRUISER (RM451U)
4 Check vehicle speed sensor (See page BE−34).
NG Replace vehicle speed sensor.
OK
Check and replace cruise control ECU
(See page IN−28 ).
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DI−310
−
DIAGNOSTICS CRUISE CONTROL SYSTEM
1996 LAND CRUISER (RM451U)
DTC 23 Vehicle Speed Signal Abnormal
CIRCUIT DESCRIPTION
See page DI−306 .
DTC No.Detection ItemTrouble Area
23
Vehicle speed sensor pulse is abnormal. (When speed signal
is not input to the ECU below 0.2 sec., code will be dis-
played.)Vehicle speed sensor
 Cruise control ECU
WIRING DIAGRAM
See page DI−306 .
INSPECTION PROCEDURE
1 Check vehicle speed sensor (See page BE−34).
NG Replace vehicle speed sensor.
OK
Check and replace cruise control ECU (See
page IN−28 ).
DI5OG−02
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I00492
Cruise Control ECU
Cruise Control Switch
MAIN
CANCEL
SET/COAST RESUME/
ACCEL
C17
C15
C17
C17
C15
C15 20 5
15
Y−R
B−G
BR BR BR
ID CCS
GND
CMS
19
1817
−
DIAGNOSTICS CRUISE CONTROL SYSTEM
DI−311
1996 LAND CRUISER (RM451U)
DTC 32 Control Switch Circuit
(Cruise Control Switch)
CIRCUIT DESCRIPTION
This circuit carries the SET/COAST, RESUME/ACCEL and CANCEL signals (each voltage) to the ECU.
DTC No.Detection ItemTrouble Area
32Short in 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
WIRING DIAGRAM
DI5OH−02
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Input SignalIndicator Light
Blinking Pattern
SET/COAST
switch
RESUME/ACCEL
switch
CANCEL switch2 Pulses
ON
OFF
ON
OFF 3 Pulses
ON
OFF SW OFF
SW ON
AB0119
I00136 I00162
ON
CCS
(+)
(−)
DI−312
−
DIAGNOSTICS CRUISE CONTROL SYSTEM
1996 LAND CRUISER (RM451U)
INSPECTION PROCEDURE
1 Input signal check.
PREPARATION:
See input signal check on page DI−286.
CHECK:
Check the indicator light operation when each of the SET/
COAST, RESUME/ACCEL and CANCEL is turned on.
OK:
SET/COAST, RESUME/ACCEL switch
The signals shown in the table on the left should be
output when each switch is ON. The signal should
disappear when the switch is turned OFF.
CANCEL switch
The indicator light goes off when the cancel switch is
turned ON.
OK Wait and see.
NG
2 Check voltage between terminals CCS 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 terminals CCS of ECU connector
and body ground, when each of the SET/COAST, RESUME/
ACCEL and CANCEL is turned ON.
Switch positionResistance (Ω )
Neutral10 − 14 V
RES/ACC0.7 − 2.5 V
SET/COAST2.3 − 4.6 V
CANCEL4.1 − 7.2 V
NG Proceed to next circuit inspection shown on
problem symptoms table (See page DI−295 )
OK
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N16045
3
4
−
DIAGNOSTICS CRUISE CONTROL SYSTEM
DI−313
1996 LAND CRUISER (RM451U)
3 Check control switch.
PREPARATION:
(a) Remove steering wheel center pad.
(b) Disconnect the control switch connector.
CHECK:
Measure resistance between terminals 3 and 4 of control switch
connector when control switch is operated.
Switch positionResistance (Ω )
Neutral∞ (No continuity)
RES/ACC50 − 80
SET/COAST180 − 220
CANCEL400 − 440
NG Replace control switch.
OK
4Check harness and connector between cruise control ECU and cruise contro\
l switch,
cruise control switch and body ground (See page
IN−28).
NG Repair or replace harness or connector.
OK
5 Input signal check (See step 1).
OK Wait and see.
NG
Check and replace cruise control ECU
(See page IN−28 ).
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