Replace Ecm

Cruise Control Switch Circuit

DESCRIPTION

The cruise control main switch operates 7 functions: SET, COAST, TAP-DOWN, RESUME, ACCEL, TAP-UP, and CANCEL. The SET, TAP-DOWN and COAST functions, and the RESUME, TAP-UP and ACCEL functions are operated with the same switch. The cruise control main switch is an automatic return type switch which turns on only while operating it in each arrow direction and turns off after releasing it. The internal contact point of the cruise control main switch is turned on with the switch operation. Then the ECM reads the resistance value that has been changed by the switch operation to control SET, COAST, RESUME, ACCEL and CANCEL.

WIRING DIAGRAM

N I045730E01

INSPECTION PROCEDURE

READ VALUE OF INTELLIGENT TESTER

(a) Connect the intelligent tester to the DLC3.

(b) Turn the ignition switch on, and turn the intelligent tester main switch on.

(c) Check the DATA LIST for proper functioning of the cruise control main switch.

CC (ECM):

Item

Measurement Item / Display (Range)

Normal Condition

Diagnostic Note

MAIN SW (MAIN)

Main SW signal (Main CPU) / ON or OFF

ON: Main SW ON (Pushed on) OFF: Main SW OFF (Pushed off)

-

CANCEL SW

CANCEL SW signal / ON or OFF

ON: CANCEL SW ON OFF: CANCEL SW OFF

-

SET/COAST SW

SET/- SW signal / ON or OFF

ON: SET/- SW ON OFF: SET/- SW OFF

-

RES/ACC SW

RES/+ SW signal / ON or OFF

ON: RES/+ SW ON OFF: RES/+ SW OFF

-

When cruise control main switch operation is performed the results will be same as above.

Result:

Result

Proceed to

OK

A

NG (All items are defective.)

B

NG (One to four items are defective.)

C

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

REPLACE CRUISE CONTROL MAIN SWITCH

INSPECT CRUISE CONTROL MAIN SWITCH

(a) Disconnect the cruise control main switch connector.

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