1996 TOYOTA T100 sensor

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DI34V−02
BE4034
Indicator Light
1.5 sec.0.5 sec.
ON
OFF
I22833
DLC1 DI−410
− DIAGNOSTICSCRUISE CONTROL SYSTEM
1996 TOYOTA T100 (RM449U)
PRE−CHECK
1. DIAGNOSIS SYSTEM
(a) Check the indicator.
(1) Turn the ignition switch to ON.
(2) Check that the CRUISE MAIN indicator light comes
on when the cruise control main switch is turned on,
and that the indicator light goes off when the main
switch is turned OFF.
HINT:
If the indicator check result is not normal, proceed to trouble-
shooting (See page BE−36) for the combination meter
section.
(b) Check the DTC.
HINT:
If a malfunction occurs in the No. 1 vehicle speed sensors or ac-
tuator, etc. during cruise control driving, the ECU actuates
AUTO CANCEL of the cruise control and turns on and off the
CRUISE MAIN indicator light to inform the driver of a malfunc-
tion. At the same time, the malfunction is stopped in memory as
a diagnostic trouble code.
(c) Using diagnosis check wire, check the output of DTC.
(1) Turn the ignition switch ON.
(2) Using SST, connect terminals Tc and E
1 of DLC1.
SST 09843−18020
(3) Read the DTC on the CRUISE MAIN indicator light.

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1
12
No.Operation MethodCRUISE MAIN Indicator LIght
Blinking PatternDiagnosis
1
2
3
4Drive approx. 40 km/h
(25 mph) or over
Drive approx 40 km/h
(25 mph) or below
LightON
OFF
LightON
OFF
ON
OFFSET/COAST switch circuit
is normal
RES/ACC switch circuit
is normal
LightON
OFF LightON
OFF
1sec.
0.25 sec. 0.25 sec.Push the speed control switch
SET/COAT on.
Push the speed control switch
RESUME/ACCEL on.
Each cancel switch turned
ON.
 Speed control switch (to
CANCEL)
 Stop light switch
 Park/Neutral position switch
(to N or O Position)
 Clutch start switch
 Parking brake switch
Speed sensor circuit is
normal
Speed sensor circuit is
normalEach cancel switch is
normal
5 DI−414
− DIAGNOSTICSCRUISE CONTROL SYSTEM
1996 TOYOTA T100 (RM449U)
5. INPUT SIGNAL CHECK
HINT:
For check No.1 ∼ No.3
Turn ignition switch ON.
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 ”(1)”.
(b) Push the main switch ON ”(2)”.
(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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− DIAGNOSTICSCRUISE CONTROL SYSTEM
DI−415
1996 TOYOTA T100 (RM449U)
DIAGNOSTIC TROUBLE CODE CHART
If a malfunction code is displayed during the DTC check, check the circuit listed for that code in the table
below and proceed to the appropriate page.
DTC No.
(See Page)Detection ItemTrouble Area
11
(DI−420)Actuator Motor Circuit
Actuator
Wire harness
Cruise control ECU
12
(DI−422)Actuator Magnetic Clutch Circuit
Actuator
Stop light switch
Wire harness
Cruise control ECU
13
(DI−425)Actuator Position Sensor Circuit
Actuator
Wire harness
Cruise control ECU
21
(DI−428)Vehicle Speed Sensor Circuit
Vehicle speed sensor
Wire harness
Cruise control ECU
*23
(DI−428)Actuator Control Cable
Vehicle Speed Sensor circuit
Vehicle speed sensor
Speed control cable function
Wire harness
Cruise control ECU
32
(DI−431)Control Switch Circuit
Cruise control switch
Wire harness
Cruise control ECU
34
(DI−431)Voltage abnormality in control switch circuit
Control switch
Wire harness
Cruise control ECU
41 Cruise Control ECUCruise control ECU
HINT:
When 2 or more codes are indicated, the lowest numbered code will be displayed first.
*When the vehicle speed decreases on uphill roads, the speed can be set again and drive can be continued
(This is not a malfunction.).

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− DIAGNOSTICSCRUISE CONTROL SYSTEM
DI−419
1996 TOYOTA T100 (RM449U)
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 ECU
DI−454
DI−428
DI−431
DI−434
DI−443
DI−420
DI−458
IN−26
SET not occurring or CANCEL occurring.
(DTC is not output)1. ECU Power Source Circuit
2. Cruise Control ECUDI−449
IN−26
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−458
DI−428
DI−440
DI−420
DI−437
IN−26
Gear shifting frequent between 3rd and O/D when driving on uphill
road. (Hurting)1. Electronically Controlled Transmission
Communication Circuit
2. Cruise Control ECUDI−440
IN−26
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−458
DI−434
DI−420
IN−26
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−458
DI−443
DI−420
IN−26
Control switch does not operate.
(SET/COAST, ACC/RES, CANCEL not possible)
1. Cruise Control Cable
2. Control Switch Circuit
3. Actuator Motor Circuit
4. Cruise Control ECUDI−458
DI−431
DI−420
IN−26
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−458
DI−428
DI−420
IN−26
Poor response in ACCEL and RESUME modes.
1. Cruise Control Cable
2. Electronically Controlled Transmission
Communication Circuit
3. Actuator Motor Circuit
4. Cruise Control ECUDI−458
DI−440
DI−420
IN−26
O/D does not resume, even though the road is not uphill.
1. Electronically Controlled Transmission
Communication Circuit
2. Cruise Control ECU
DI−440
IN−26
DTC memory is erased.1. Back−up Power Source Circuit
2. Cruise Control ECUDI−452
IN−26
DTC is not output, or is output when it should not be.1. Tc Circuit
2. Cruise Control ECUDI−456
IN−26
Cruise MAIN indicator light remains ON or fails to light up.1. Cruise MAIN Indicator Light Switch Circuit−

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DI−422
− DIAGNOSTICSCRUISE CONTROL SYSTEM
1996 TOYOTA T100 (RM449U)
DTC 12 Actuator Magnetic Clutch Circuit
CIRCUIT DESCRIPTION
This circuit turns on the magnetic clutch inside the actuator during cruise control operation according to the
signal from the ECU. If a malfunction occurs in the actuator or speed sensor, etc. during cruise control opera-
tion, the rotor shaft between the motor and control plate is released.
When the brake pedal is depressed, the stop light switch turns ON, supplying electrical power to the stop
light. Power supply to the magnetic clutch is mechanically cut and the magnetic clutch is turned OFF.
When driving downhill, if the vehicle speed exceeds the set speed by 15 km/h (9 mph), the ECU turns the
safety magnet clutch OFF. If the vehicle speed later drops to within 10 km/h (6 mph) above the set speed,
then cruise control at the set speed is resumed.
DTC No.Detection ItemTrouble Area
12Short in actuator magnetic clutch circuit.
Open (0.8 sec.) in actuator magnetic clutch circuit.
Actuator
Stop light switch
Wire harness
Cruise control ECU
WIRING DIAGRAM
DI351−02

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− DIAGNOSTICSCRUISE CONTROL SYSTEM
DI−425
1996 TOYOTA T100 (RM449U)
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
Wire harness
Cruise control ECU
WIRING DIAGRAM
DI352−02

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VR 3
VR 2
I00006
1
3
DI−426
− DIAGNOSTICSCRUISE CONTROL SYSTEM
1996 TOYOTA T100 (RM449U)
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. 4.0 V
As the control plate is turned, the voltage should in-
crease gradually without interruption.
NG Proceed to next circuit inspection shown in
problem symptoms table (See page DI−419).
OK
2 Check resistance between terminals VR1 and VR3 of actuator position sensor.
PREPARATION:
(a) Turn ignition switch OFF.
(b) Disconnect the actuator connector.
CHECK:
Measure resistance between actuator terminals 1 and 3 of ac-
tuator connector.
OK:
Resistance: Approx. 2.2 kΩ (25 °C)
NG Replace cruise control actuator.
OK

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2
3
− DIAGNOSTICSCRUISE CONTROL SYSTEM
DI−427
1996 TOYOTA T100 (RM449U)
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−16).
NG Repair or replace harness or connector.
OK
Check and replace cruise control ECU (See
page IN−26).