Page 785 of 2543

chart (See page BE±170).
Proceed to next circuit inspection shown on matrix
chart (See page
BE±170).
(1) See input signal check on page BE±169.
(2) Check the indicator light when the brake pedal is
depressed.
Check operation of stop light.
Check voltage between terminal STP+, STP± of ECU connector and body
ground.
(1) Turn ignition switch ON.
(2) Measure voltage between terminal STP+, STP±
of ECU connector and body ground, when the
brake pedal is depressed and released.
Remove ECU with connectors still connected.
Input signal check.
Proceed to next circuit inspection shown on matrix
chart (See page
BE±170).
The indicator light goes off when the brake pedal is de-
pressed.
Check the stop light comes on when the brake pedal is depressed, and turns off when brake pedal is re-
leased.
Check stop light circuit.
Repair or replace harness or connector.
Check and replace ECU.
Check for open in harness and connectors between terminal STP+ of ECU and stop
light switch, terminal STP± of ECU and stop light switch (See page
IN±30).
Depressed
Released
INSPECTION PROCEDURE
± BODY ELECTRICAL SYSTEMCRUISE CONTROL SYSTEMBE±183
Page 786 of 2543
Idle Switch Circuit
CIRCUIT DESCRIPTION
When the idle switch is turned ON, a signal is sent to the ECU. The ECU uses this signal to correct the discrepan-
cy between the throttle valve position and the actuator position sensor value to enable accurate cruise control
at the set speed. If the idle switch is malfunctioning, problem symptoms also occur in the engine, so also inspect
the engine.
WIRING DIAGRAM
BE±184± BODY ELECTRICAL SYSTEMCRUISE CONTROL SYSTEM
Page 787 of 2543

INSPECTION PROCEDURE
Proceed to next circuit inspection shown on matrix
chart (See page
BE±170).
(1) Turn ignition switch ON.
(2) Measure voltage between terminal IDL of ECU
connector and body ground, when the throttle
valve is fully closed and fully opened.
Check voltage between terminal IDL of ECU connector and body ground.
Check throttle position sensor.
Measure resistance between terminals 1 and 2 of
throttle position sensor connector, when the throttle
valve is fully closed and fully opened.
(1) Remove cruise control ECU with connectors still
connected.
(2) Disconnect ECM and ABS & TRAC ECU
connector.
Disconnect throttle position sensor connector.
Throttle valve position
Fully opened
Fully closed
Voltage
Throttle valve position
Fully opened
Fully closed
Voltage
Repair or replace harness or connector.
Check and replace ECU.
Check for open and short in harness and connector between ECU and throttle
position sensor, throttle position sensor and body ground (See page
IN±30).
± BODY ELECTRICAL SYSTEMCRUISE CONTROL SYSTEMBE±185
Page 788 of 2543

Electronically Controlled Transmission Communication Circuit
CIRCUIT DESCRIPTION
When driving uphill under cruise control, in order to reduce shifting due to ON±OFF overdrive operation and
to provide smooth driving, when down shifting in the electronically controlled transmission occurs, a signal to
prevent upshift until the end of the uphill slope is sent from the cruise control ECU to the electronically controlled
transmission.
Terminal ECM of the cruise control ECU detects the shift change signal (output to electronically controlled trans-
mission No.2 solenoid) from the electronically controlled transmission.
If vehicle speed down, also when terminal ECT of the cruise control ECU receives down shifting signal, it sends
a signal from terminal OD to ECM to cut overdrive until the end of the uphill slope, and the gear shifts are reduced
and gear shift points in the electronically controlled transmission are changed.
WIRING DIAGRAM
BE±186± BODY ELECTRICAL SYSTEMCRUISE CONTROL SYSTEM
Page 789 of 2543
INSPECTION PROCEDURE
(1) Disconnect ECU connector.
(2) Turn ignition switch ON.
(3) Measure voltage between terminal OD of har±
ness side connector of ECU and body ground.
Check voltage between terminal OD of harness side connector ECU and
body ground.
Check operation of overdrive.
Remove ECU with connector still connected.
Check and Repair Electronically controlled transmis-
sion (See AT section).
Voltage: 10 ± 14 V
Go to step
Go to step
Test drive after engine warm up.
Check that overdrive ON e OFF occurs with operation of OD switch ON±OFF.
± BODY ELECTRICAL SYSTEMCRUISE CONTROL SYSTEMBE±187
Page 790 of 2543
(See page IN±30).
Check voltage between terminal ECT of cruise control ECU connector and
body ground (On test drive).
(1) Connect ECU connector.
(2) Test drive after engine warm up.
Proceed to next circuit inspection shown on
matrix chart (See page BE±170).
Check voltage between terminal ECT of
cruise control ECU connector and body
ground when OD switch is on and off.
Repair or replace harness or connector.
Check and replace ECU.
Check and repair ECU.
Repair or replace harness or connector.
Check for open and short in harness and connector between terminal OD1
of ECU and terminal OD1 of ECM (See page IN±30).
Check for open and short in harness and connector between terminal ECT cruise
control ECU and electronically controlled transmission solenoid(See page
IN±30).
VoltageGear Position
BE±188± BODY ELECTRICAL SYSTEMCRUISE CONTROL SYSTEM
Page 791 of 2543
Parking Brake Switch Circuit
CIRCUIT DESCRIPTION
When the parking brake pedal is depressed, the parking brake switch sends a signal to the ECU. When this
signal is input to the ECU during cruise control driving, the ECU cancels cruise control.
WIRING DIAGRAM
± BODY ELECTRICAL SYSTEMCRUISE CONTROL SYSTEMBE±189
Page 792 of 2543

(See page BE±42).
BE±169.
Proceed to next circuit inspection shown on matrix
chart (See page
BE±170).
(1) See input signal check on page BE±169.
(2) Check the indicator light when the parking brake
lever is pulled up.
Check operation of brake warning light.
Check voltage between terminal PKB of cruise control ECU connector and
body ground.
(1) Turn ignition switch ON.
(2) Measure voltage between terminal PKB of cruise
control ECU connector and body ground, when
the parking brake lever is pulled up and released.
Remove cruise control ECU with connectors still con-
nected.
Input signal check.
The indicator light goes off when the parking brake lever
is pulled up.
Check that the brake warning light in the instrument panel comes on when the parking brake lever is
pulled up with the engine running, and the light goes off when the parking brake lever is released.
Check brake warning light circuit
Parking brake lever
Proceed to next circuit inspection shown on matrix
chart (See page
BE±170).
Voltage
Pulled up
Released
Check for open in harness and connector between cruise control ECU and
brake warning light.
Repair or replace harness or connector.
Check and replace cruise control ECU. BE±190
± BODY ELECTRICAL SYSTEMCRUISE CONTROL SYSTEM