1996 TOYOTA T100 engine

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15 C15
− DIAGNOSTICSCRUISE CONTROL SYSTEM
DI−417
1996 TOYOTA T100 (RM449U)
TERMINALS OF ECU
Symbols (Terminals No.)Wiring ColorConditionSTD Voltage (V)
D ↔ GND (C15−2 ↔ C15−13)B−W ↔ B−O
Shift to except D position (A/T Vehicle)
Depress Clutch Pedal (M/T Vehicle)Below 1 V
Shift to D position (A/T Vehicle)
Depress Clutch Pedal (M/T Vehicle)10 − 16 V
PI ↔ GND (C15−5 ↔ C15−13)B−Y ↔ B−O
Ignition switch ON
Cruise control main switch ONBelow 1.2 V
Ignition switch ON
Cruise control main switch OFF10 − 16 V
TC ↔ GND
(C15−8 ↔ C15−13)Y−B ↔B−OIgnition switch ON10 − 16 V
OD ↔ GND
(C15−9 ↔ C15−13)Y−R ↔ B−O
During cruise control driving
OD switch ON.10 − 16 V
During cruise control driving
OD switch OFF (3rd driving)Below 1 V
L ↔ GND
(C15−10 ↔ C15−13)Y−R ↔ B−ODuring cruise control driving9 − 15 V
Except during cruise control drivingBelow 1 V
MC ↔ GND
(C15−11 ↔ C15−13)B−R ↔ B−O
During cruise control driving
COAST switch held ON9 − 16 V
During cruise control driving
ACC switch held ONBelow 1 V
MO ↔ GND
(C15−12 ↔ C15−13)LG ↔ B−O
During cruise control driving
ACC switch held ON9 − 15 V
During cruise control driving
COAST switch held ONBelow 1 V
GND ↔ Body Ground
(C15−13 ↔ Body Ground)B−O ↔ Body
GroundConstantBelow 1 V
B ↔ GND
(C15−14 ↔ C15−13)L−R ↔ B−OIgnition switch ON10 − 16 V
BATT ↔ GND
(C15−15 ↔ C15−13)R ↔ B−OConstant10 − 16 V
STP− ↔ GND
(C15−16 ↔ C15−13)G−W ↔ B−ODepress brake pedal10 − 16 V
Release brake pedalBelow 1 V

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− DIAGNOSTICSCRUISE CONTROL SYSTEM
1996 TOYOTA T100 (RM449U) Symbols (Terminals No.)
Wiring ColorConditionSTD Voltage (V)
CCS ↔ GND
(C15−18 ↔ C15−13)G−Y ↔ B−O
Ignition switch ON10 − 16 V
Ignition switch ON
CANCEL switch held ON5.1 − 8.3 V
Ignition switch ON
SET/COAST switch held ON2.4 − 4.0 V
Ignition switch ON
RES/ACC switch held ON0.8 − 1.4 V
CMS ↔ GND
(C15−4 ↔ C15−13)G−B ↔ B−O
Ignition switch ON
Main switch ONBelow 1 V
Ignition switch ON
Main switch OFF10 − 16 V
SPD ↔ GND
(C15−20 ↔ C15−13)G ↔ B−OIgnition switch ON4.7 − 5.2 V
During driving3 − 7 V
IDL ↔ GND
(C15−23 ↔ C15−13)Y−L ↔ B−O
Ignition switch ON
Throttle valve fully closedBelow 1 V
Ignition switch ON
Throttle valve fully opened10 − 16 V
ECT ↔ GND
(C15−22 ↔ C15−13)R−Y ↔ B−O
During cruise control driving
Gear position O/DBelow 1 V
During cruise control driving
Gear position 3rd10 − 16 V
VR1 ↔ GND
(C15−24 ↔ C15−13)R−W ↔ B−OIgnition switch ON4.7 − 5.2 V
VR2 ↔ VR3
(C15−25 ↔ C15−26)R ↔ 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
(C15−26 ↔ C15−13)L ↔ B−OConstantBelow 1 V
L− ↔ GND
(C15−10 ↔ C15−13)Y−R ↔ B−OConstantBelow 1 V

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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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Duty Ratio =A + BA
x 100 (%)
ON
OFFA
B
1 cycle
I22682
DI−420
− DIAGNOSTICSCRUISE CONTROL SYSTEM
1996 TOYOTA T100 (RM449U)
CIRCUIT INSPECTION
DTC 11 Actuator Motor Circuit
CIRCUIT DESCRIPTION
The actuator motor is operated by signals from the ECU. Acceleration and deceleration signals are trans-
mitted by changes in the Duty Ratio (See note below).
Duty Ratio:
The duty ratio is the ratio of the period of continuity in one cycle. For example, if A is the period of continuity
in one cycle, and B is the period of non−continuity, then.
DTC No.Detection ItemTrouble Area
11Short in actuator motor circuit.
Actuator motor
Wire harness
Cruise control ECU
WIRING DIAGRAM

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76
− DIAGNOSTICSCRUISE CONTROL SYSTEM
DI−421
1996 TOYOTA T100 (RM449U)
INSPECTION PROCEDURE
1 Check resistance between terminals MO and MC of actuator motor.
PREPARATION:
(a) Turn ignition switch OFF.
(b) Disconnect the actuator connector.
CHECK:
Measure resistance between terminals 6 and 7.
HINT:
If control plate position is fully opened or fully closed, resistance
can not be measured.
OK:
Resistance: more than 4.2 Ω
NG Replace cruise control actuator.
OK
2 Check for open and short in harness and connectors between cruise control
ECU and actuator motor (See page IN−16).
NG Repair or replace harness or connector.
OK
Check and replace cruise control ECU (See
page IN−26).

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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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STOP Fuse
I22835
− DIAGNOSTICSCRUISE CONTROL SYSTEM
DI−423
1996 TOYOTA T100 (RM449U)
INSPECTION PROCEDURE
1 Check STOP fuse.
PREPARATION:
(a) Turn ignition switch OFF.
(b) Remove the STOP fuse from instrument panel junction
block.
CHECK:
Check fuse continuity.
OK:
Continuity
NG Replace STOP fuse.
OK
2 Check stop light switch.
PREPARATION:
Disconnect the stop light switch connector.
CHECK:
Check continuity between terminals.
Switch positionContinuity
Switch pin free
(Brake pedal depressed)2 − 4
Switch pin pushed in
(Brake pedal released)1 − 3
NG Replace stop light switch.
OK

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4
5
DI−424
− DIAGNOSTICSCRUISE CONTROL SYSTEM
1996 TOYOTA T100 (RM449U)
3 Check resistance between terminal L and GND of actuator magnetic clutch.
PREPARATION:
(a) Turn ignition switch OFF.
(b) Disconnect the actuator connector.
CHECK:
Measure resistance between terminals 4 and 5.
OK:
Resistance: 34.65  42.35 Ω
NG Replace cruise control actuator.
OK
4 Check for open and short in harness and connectors between cruise control
ECU and actuator magnetic clutch, actuator magnetic clutch and body ground
(See page IN−16).
NG Repair or replace harness or connector.
OK
Check and replace cruise control ECU (See
page IN−26).