1996 TOYOTA T100 check engine

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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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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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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).

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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).

Downloaded from www.Manualslib.com manuals search engine Input SignalIndicator Light
Blinking Pattern
Drive at about
40 km/h (25 mph)
or below
Drive at about
40 km/h (25 mph)
or higherLightON
OFF
LightON
OFF
− DIAGNOSTICSCRUISE CONTROL SYSTEM
DI−429
1996 TOYOTA T100 (RM449U)
INSPECTION PROCEDURE
1 Input signal check.
CHECK:
(a) See input signal check on page DI−410.
(b) Check indicator light operation when driving at vehicle
speed above 40 km/h (25 mph), and at vehicle speed be-
low 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−26).
NG
2 Check speedometer circuit (See Combination meter troubleshooting on page
BE−36).
NG Repair or replace harness, connector or com-
bination meter assembly.
OK
3 Check harness and connector between cruise control ECU and combination me-
ter, combination meter and vehicle speed sensor (See page IN−16).
NG Repair or replace harness or connector.
OK