Cruise Control: Testing and Inspection

AUTOMATIC SPEED CONTROL DEVICE (ASCD)

Malfunction Detection Conditions

Malfunction Detection Conditions:

Fail Safe System Check

Fail-safe System Check:

1. Turn ignition switch ON.
2. Turn ASCD (Automatic Speed Control Device) main switch to ON position and check if the "cruise indicator" blinks.
If the indicator lamp blinks, check the following.
^ ASCD steering switch. Refer to "DIAGNOSTIC PROCEDURE 5"

Fail-safe System Check:

3. Drive the vehicle at more than 48 kph (30 mph) and push SET/COAST switch.
If the indicator lamp blinks, check the following:
^ Vehicle speed sensor. Refer to "DIAGNOSTIC PROCEDURE 6".
^ ASCD pump circuit Refer to "DIAGNOSTIC PROCEDURE 7".
^ Replace control unit.

Fail-safe System Check:

4. Depress brake pedal slowly (brake pedal should be depressed more than 5 seconds)
If the indicator lamp blinks, check the following:
^ ASCD brake/stop lamp switch Refer to "DIAGNOSTIC PROCEDURE 4".
5. END. (System is OK.)


TROUBLE DIAGNOSES

Symptom Chart

Symptom Chart:

Diagnostic Procedure 1 (Power Supply And Ground Circuit Check)

Diagnostic Procedure 1 (Power Supply And Ground Circuit Check):

Diagnostic Procedure 2 (ASCD Main Switch Check)

Diagnostic Procedure 2 (ASCD Main Switch Check):

Diagnostic Procedure 3 (ASCD Hold Relay Check)

Diagnostic Procedure 3 (Automatic Speed Control Device (ASCD) Hold Relay Circuit Check):

Diagnostic Procedure 4 (ASCD Brake/Stop Lamp Switch Check

Diagnostic Procedure 4 (Automatic Speed Control Device (ASCD) Brake/Stop Lamp Switch Check):

Diagnostic Procedure 5 (ASCD Steering Switch Check)

Diagnostic Procedure 5 (Automatic Speed Control Device (ASCD) Steering Switch Check):

Diagnostic Procedure 6 (Vehicle Speed Sensor Check)

Diagnostic Procedure 6 (Vehicle Speed Sensor Check):

Diagnostic Procedure 7 (ASCD Pump Circuit Check)

Diagnostic Procedure 7 (Automatic Speed Control Device (ASCD) Pump Circuit Check):

Diagnostic Procedure 8 (ASCD Actuator/Pump Check)

Diagnostic Procedure 8 (ASCD Actuator/Pump Check):

ELECTRICAL COMPONENTS INSPECTION

ASCD Main Switch

ASCD Main Switch:

Check continuity between terminals by pushing switch to each position.

ASCD Brake Switch And Stop Lamp Switch

ASCD Brake Switch And Stop Lamp Switch:

Check each switch after adjusting brake pedal.

ASCD Clutch Switch (For M/T Models)

ASCD Clutch Switch (For M/T Models):

Inhibitor Switch (For A/T Models)

Inhibitor Switch (For A/T Models):