1996 TOYOTA T100 engine

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− DIAGNOSTICSCRUISE CONTROL SYSTEM
DI−449
1996 TOYOTA T100 (RM449U)
ECU Power Source Circuit
CIRCUIT DESCRIPTION
The ECU power source supplies power to the actuator and sensors, etc. when terminal GND and the cruise
control ECU case are grounded.
WIRING DIAGRAM
DI35A−02

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ECU−IG Fuse
AB0119
I00014I00027
GND B ON
(−)(+)
DI−450
− DIAGNOSTICSCRUISE CONTROL SYSTEM
1996 TOYOTA T100 (RM449U)
INSPECTION PROCEDURE
1 Check ECU−IG fuse.
PREPARATION:
Remove the ECU−IG fuse from instrument panel junction block.
CHECK:
Check continuity of ECU−IG fuse.
OK:
Continuity
NG Check for short in all the harness and compo-
nents connected to ECU−IG fuse.
OK
2 Check voltage between terminals B and GND of cruise control ECU connector.
PREPARATION:
(a) Remove the ECU with connector still connected.
(b) Turn ignition switch ON.
CHECK:
Measure voltage between terminals B and GND of ECU con-
nector.
OK:
Voltage: 10 − 16 V
OK Proceed to next circuit inspection shown in
problem symptoms table (See page DI−419).
NG

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GND
− DIAGNOSTICSCRUISE CONTROL SYSTEM
DI−451
1996 TOYOTA T100 (RM449U)
3 Check resistance between terminal GND of cruise control ECU connector and
body ground (See page IN−16).
CHECK:
Measure resistance between terminal GND of ECU connector
and body ground.
OK:
Resistance: Below 1 Ω
NG Repair or replace harness or connector.
OK
Check and repair harness and connector be-
tween cruise control ECU and battery (See
page IN−26).

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DI−452
− DIAGNOSTICSCRUISE CONTROL SYSTEM
1996 TOYOTA T100 (RM449U)
Back−up Power Source Circuit
CIRCUIT DESCRIPTION
The ECU back−up power source provides power even when the ignition is OFF, and it is used for DTC
memory, etc..
WIRING DIAGRAM
DI35B−02

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ECU−B Fuse
I00016
BATT
(−)
(+)
− DIAGNOSTICSCRUISE CONTROL SYSTEM
DI−453
1996 TOYOTA T100 (RM449U)
INSPECTION PROCEDURE
1 Check ECU−B fuse.
PREPARATION:
Remove the ECU−B fuse from relay block No.1.
CHECK:
Check continuity of ECU−B fuse.
OK:
Continuity
NG Check for short in all the harness and compo-
nents connected to the ECU−B fuse.
OK
2 Check voltage between terminal BATT of cruise control ECU connector and body
ground (See page IN−16).
PREPARATION:
Remove the ECU with connector still connected.
CHECK:
Measure voltage between terminal BATT of ECU connector
and body ground.
OK:
Voltage: 10 − 16 V
OK Proceed to next circuit inspection shown in
problem symptoms table (See page DI−419).
NG
Check and repair harness and connector be-
tween battery and cruise control ECU (See
page IN−16).

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DI−454
− DIAGNOSTICSCRUISE CONTROL SYSTEM
1996 TOYOTA T100 (RM449U)
Main Switch Circuit
CIRCUIT DESCRIPTION
When the cruise control main switch is turned OFF, the cruise control does not operate.
WIRING DIAGRAM
See page DI−431.
INSPECTION PROCEDURE
1 Check voltage between terminal CMS 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 CMS of cruise control ECU
connector when main switch is held ON and OFF.
OK:
Main switchVoltage
OFF10 − 16 V
ONBelow 1 V
OK Proceed to next circuit inspection shown in
problem symptoms table (See page DI−419).
NG
DI35C−02

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42
− DIAGNOSTICSCRUISE CONTROL SYSTEM
DI−455
1996 TOYOTA T100 (RM449U)
2 Check main switch continuity.
PREPARATION:
(a) Remove steering wheel center pad. (See SR section)
(b) Disconnect the control switch connector.
CHECK:
Check continuity between terminals 2 and 4 of control switch
connector when main switch is held ON and OFF.
OK:
Switch positionTester connectionSpecified condition
OFF2 − 4No continuity
Hold ON2 − 4Continuity
NG Replace control switch.
OK
3 Check harness and connector between cruise control ECU and main switch (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−456
− DIAGNOSTICSCRUISE CONTROL SYSTEM
1996 TOYOTA T100 (RM449U)
Tc Circuit
CIRCUIT DESCRIPTION
This circuit sends a signal to the ECU that DTC output is required.
WIRING DIAGRAM
DI35D−02