TOYOTA T100 1996 Factory Service Manual

Downloaded from www.Manualslib.com manuals search engine I06382
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 I00414
Speed Sensor
ECTOD/TRIP METER
Cruise Control ECU 4 pulse/
1 rotation
of rotor shaft4 pulse/
1 rotation
of rotor shaft
I22673
DI−428
− DIAGNOSTICSCRUISE CONTROL SYSTEM
1996 TOYOTA T100 (RM449U)
DTC 21 Vehicle Speed Sensor Circuit
CIRCUIT DESCRIPTION
The vehicle speed siggnal is sent to cruise control ECU from the vehicle speed sensor.
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 signal through the combination
meter 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
21Speed signal is not input to the cruise control ECU while
cruise control is set.Vehicle speed sensor
Wire harness
Cruise control ECU
WIRING DIAGRAM
DI353−02

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

Downloaded from www.Manualslib.com manuals search engine DI−430
− DIAGNOSTICSCRUISE CONTROL SYSTEM
1996 TOYOTA T100 (RM449U)
4 Check vehicle speed sensor (See page BE−38).
NG Replace vehicle speed sensor.
OK
Check and replace cruise control ECU (See
page IN−26).

Downloaded from www.Manualslib.com manuals search engine I22674
− DIAGNOSTICSCRUISE CONTROL SYSTEM
DI−431
1996 TOYOTA T100 (RM449U)
DTC 32, 34 Control Switch Circuit
CIRCUIT DESCRIPTION
This circuit sends 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
Wire harness
Cruise control ECU
34Voltage abnormality in control switch circuit
WIRING DIAGRAM
DI354−02

Downloaded from www.Manualslib.com manuals search engine Input SignalIndicator Light
Blinking Pattern
SET/COAST
switch
RESUME/ACCEL
switch
CANCEL switch2 Pulses
ON
OFF
ON
OFF3 Pulses
ON
OFFSW OFF
SW ON
AB0119
I00136
I00162
ON
CCS
(+) (−)
DI−432
− DIAGNOSTICSCRUISE CONTROL SYSTEM
1996 TOYOTA T100 (RM449U)
INSPECTION PROCEDURE
1 Input signal check.
PREPARATION:
See input signal check on page DI−410.
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 terminal 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 terminal CCS of ECU connector and
body ground, when each of the SET/COAST, RESUME/AC-
CEL and CANCEL is turned ON.
Switch positionVoltage (V)
Neutral10 − 16
RES/ACC0.8 − 14 V
SET/COAST2.4 − 4.0 V
CANCEL5.1 − 8.3 V
NG Proceed to next circuit inspection shown in
problem symptom table (See page DI−419).
OK

Downloaded from www.Manualslib.com manuals search engine N16045
3 4
− DIAGNOSTICSCRUISE CONTROL SYSTEM
DI−433
1996 TOYOTA T100 (RM449U)
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 control switch,
cruise control switch and body ground (See page
IN−16).
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−26).

Downloaded from www.Manualslib.com manuals search engine I22687
DI−434
− DIAGNOSTICSCRUISE CONTROL SYSTEM
1996 TOYOTA T100 (RM449U)
Stop Light Switch Circuit
CIRCUIT DESCRIPTION
When the brake pedal is depressed, the stop light switch sends a signal to the ECU. When the ECU receives
this signal, it cancels the cruise control.
A fail−safe function is provided so that the cancel functions normally, even if there is a malfunction in the stop
light signal circuit.
The cancel conditions are: Battery positive voltage at terminal STP−
When the brake is ON, battery positive voltage is normally applied through the STOP fuse and stop light
switch to terminal STP− of the ECU, and the ECU turns the cruise control OFF.
If the harness connected to terminal STP− has an open circuit, terminal STP− will have battery positive volt-
age and the cruise control will be turned OFF.
Also, when the brake is ON, the magnetic clutch circuit is cut mechanically by the stop light switch, turning
the cruise control OFF (See page DI−422 for operation of the magnetic clutch).
WIRING DIAGRAM
DI355−02

Downloaded from www.Manualslib.com manuals search engine Input SignalIndicator Light
Blinking Pattern
Stop Light
switch ON
LightON
OFFSW OFF
SW ON
− DIAGNOSTICSCRUISE CONTROL SYSTEM
DI−435
1996 TOYOTA T100 (RM449U)
INSPECTION PROCEDURE
1 Check operation of stop light.
CHECK:
Check that stop light comes on when brake pedal is depressed, and turns off when brake pedal is released.
NG Check stop light system (See page BE−30).
OK
2 Input signal check.
CHECK:
(a) See input signal check on DI−410.
(b) Check the indicator light when the brake pedal is de-
pressed.
OK:
The indicator light goes off when the brake pedal is
depressed.
OK Proceed to next circuit inspection shown in
problem symptoms table (See page DI−419).
NG

Downloaded from www.Manualslib.com manuals search engine AB0119
I00015I00024
ON
STP−
(−) (+)
DI−436
− DIAGNOSTICSCRUISE CONTROL SYSTEM
1996 TOYOTA T100 (RM449U)
3 Check voltage between terminal STP− of cruise control ECU connector and
body ground.
PREPARATION:
(a) Remove the ECU with connectors still connected.
(b) Turn ignition switch ON.
CHECK:
Measure voltage between terminal STP− of cruise control ECU
connector and body ground, when the brake pedal is de-
pressed and released.
OK:
Depressed10 − 16 V
ReleasedBelow 1 V
OK Proceed to next circuit inspection shown in
problem symptoms table (See page DI−419).
NG
4 Check for open in harness and connectors between terminal STP− of cruise con-
trol ECU and stop light switch (See page IN−16).
NG Repair or replace harness or connector.
OK
Check and replace cruise control ECU (See
page IN−26).