Cruise Control - Updated Repair/Diagnostics
REFERENCE ELECTRICALNUMBER 014
DATE 6-8-84
MODEL AE86
This bulletin contains the inspection and repair procedures resulting from a change in the cruise control system on the Corolla (FR) after February 1984 production. The cruise control switch has been relocated from the instrument panel to the stalk lever for easier operation.
Control Switch:
Control Switch
COMPONENTS
Wire Connector:
Switch Continuity Chart:
INSPECTION OF CONTROL SWITCH
1. INSPECT SWITCH CONTINUITY
If continuity is not as specified, replace the switch.
Continuity:
2. INSPECT SWITCH OPERATION
Connect the positive (+) lead from the battery to terminal
16. Connect the negative (-) lead to terminal 20.
(a) Check that there is continuity between terminals 16 and 21 with the main switch turned on.
No Continuity:
(b) Check that there is no continuity between terminals 16 and 21 with the main switch turned off. If operation is not as specified, replace the switch.
REPLACEMENT OF CONTROL SWITCH:
REPLACEMENT OF CONTROL SWITCH
REPLACE CONTROL SWITCH
(a) Remove the terminals from the connector.
(b) Remove the control switch with two screws.
(c) Install the control switch with two screws.
(d) Install the terminals to the connector.
Refer to the 1984 COROLLA FR repair manual for inspection of the following parts. (Pub. No. 36220A)
Clutch Switch (See page BE-45)
Neutral Start Switch (See page AT-4)
Parking Brake Switch (See page BE-26)
Speed Sensor (See page BE-45)
Stop Light Switch (See page BE-46)
Actuator (See page BE-46)
Cruise Control Computer Circuit
INSPECTION OF COMPUTER CIRCUIT Disconnect the computer and inspect the connector on the wire harness side as shown in the chart below.
Wiring Diagram:
CRUISE CONTROL SYSTEM
Wiring Diagram
Troubleshooting
Problem Inspection Item No.
Cruise control does not operate. Inspection of power source circuit A
Vehicle speed does not reduce when
coast switch turned on.
Vehicle does not accelerate when accel Inspection of control switch and circuit B
switch turned on. Vehicle speed does not
return to memorized speed when resume
switch turned on.
Set speed deviates on high side. Inspection of actuator and circuit C
Set speed deviates on low side.
Vehicle speed does not fluctuate when Inspection of actuator and circuit C
set switch turned on. Inspection of speed sensor and circuit H
Setting speed does not cancel when Inspection of stop light switch and circuit D
brake pedal depressed.
Setting speed does not cancel when Inspection of parking brake switch and E
parking brake pulled. circuit
Setting speed does not cancel when Inspection of clutch switch and circuit F
clutch pedal depressed (M/T only).
Setting speed does not cancel when Inspection of neutral start switch and G
shifted to "N" range (A/T only). circuit
Speed can be set below 20 km/h (12 mph).
Cruise control will not disengage even Inspection of speed sensor and circuit H
below 20 km/h (12 mph).
Inspection Of Source Circuit:
Inspection Of Source Circuit:
Inspection Of Source Circuit:
Inspection Of Source Circuit:
A. INSPECTION OF SOURCE CIRCUIT
Inspection Of Control Switch Circuit:
B. INSPECTION OF CONTROL SWITCH CIRCUIT
Inspection Of Actuator Circuit:
C. INSPECTION OF ACTUATOR CIRCUIT
Inspection Of Stop Light Switch Circuit:
D. INSPECTION OF STOP LIGHT SWITCH CIRCUIT
Inspection Of Parking Brake Switch:
E. INSPECTION OF PARKING BRAKE SWITCH
Inspection Of Clutch Switch Circuit:
F. INSPECTION OF CLUTCH SWITCH CIRCUIT
Inspection Of Neutral Start Switch Circuit:
G. INSPECTION OF NEUTRAL START SWITCH CIRCUIT
Inspection Of Speed Sensor Circuit:
H. INSPECTION OF SPEED SENSOR CIRCUIT
Cruise Control Circuit:
CRUISE CONTROL
(B) CRUISE CONTROL S/W (G) ACTUATOR
3-8 = CLOSED WITH MAIN S/W PUSHED IN. 1-2 = 30 OHMS (CONTROL VALVE)
1-7 = CLOSED WITH CONTROL S/W AT SET POSITION. 1-3 = 68 OHMS (RELEASE VALVE)
2-7 = CLOSED WITH CONTROL S/W AT RESUME POSITION. (H) CRUISE CONTROL STOP S/W
(C) SPEED SENSOR 1-2 = CLOSED WITH BRAKE PEDAL DEPRESSED.
CLOSED 4 TIMES PER SPEEDOMETER SHAFT REVOLUTION.
(ONE OF THE CANCEL S/W)
(D) PARKING BRAKE S/W (I) STOP LIGHT S/W
1-GROUND = CLOSED WITH PARKING BRAKE LEVER 1-2 = CLOSED WITH BRAKE PEDAL DEPRESSED.
PULLED UP (ONE OF THE CANCEL S/W). (ONE OF THE CANCEL S/W)
(E) CLUTCH S/W 2-3 = CLOSED WITH CLUTCH PEDAL DEPRESSED. (ONE OF THE CANCEL S/W)