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.
Terminal Connection or Check Item Tester Connection Condition Voltage or
Measure Item Resistance value
2 Stop Light Switch Resistance 2 - 14 Brake pedal returned About 30 ohms
and Release Valve
4 Control Valve Resistance 4-14 About 68 ohms
5 Control Switch Continuity 5 - Body ground Turn set/coast switch on Continuity
(Set/coast S/W) Turn set/coast switch off No continuity
7 Speed Sensor Continuity 7 - Body ground Vehicle moving slowly 1 pulse each
40 cm (15.75 in.)
Turn ignition switch Battery voltage
and main switch on
10 Main Switch Voltage 10 - Body ground Turn ignition switch No voltage
and/or main switch off
Clutch pedal depressed or Continuity
11 Clutch Switch or Continuity 11 - Body ground if shifted into "N" range
Neutral Start Switch Clutch pedal returned or
if shifted into any range No continuity
except "N" range
Parking brake lever No voltage
12 Parking Brake Switch Voltage 12 - Body ground pulled
Parking brake lever Battery voltage
returned
13 Body Ground Continuity 13 - Body ground Continuity
14 Release Valve and
Control Valve
Brake pedal depressed Battery voltage
15 Stop Light Switch Voltage 15 - Body ground
Brake pedal returned No voltage
16 STOP Fuse Voltage 16 - Body ground Battery voltage
Turn resume/accel Continuity
Control Switch switch on
17 (Resume/accel S/W) Continuity 17 - Body ground Turn resume/accel
switch off No continuity
INSPECTION OF MAIN SWITCH:
Main Switch
INSPECTION OF MAIN SWITCH
INSPECT SWITCH CONTINUITY Connect the positive (+) lead from the battery to terminal
2. Connect the negative (-) lead to terminal 3.
(a) Check that there is continuity between terminals 2 and 6 with the main switch on.
(b) Check that there is continuity between terminals 2 and 6 with the main switch off. If continuity is not as specified, replace the switch.
INSPECTION OF CONTROL SWITCH:
Switch continuity between terminals:
Control Switch
INSPECTION OF CONTROL SWITCH
INSPECT SWITCH CONTINUITY Inspect the switch continuity between terminals.
REPLACE CONTROL SWITCH:
REPLACEMENT OF CONTROL SWITCH
REPLACE CONTROL SWITCH
(a) Remove the terminals from the connector.
(b) Remove the cover and control switch.
(c) Install the control switch and cover.
(d) Install the terminals to the connector.
INSPECTION OF CLUTCH SWITCH:
Clutch Switch
INSPECTION OF CLUTCH SWITCH
INSPECT SWITCH CONTINUITY
(a) Check that there is continuity between terminals 2 and 3 with the clutch pedal depressed.
(b) Check that there is no continuity between terminals 2 and 3 with the clutch pedal returned. If continuity is not as specified, replace the switch.
INSPECTION OF NEUTRAL START SWITCH:
Neutral Start Switch
INSPECTION OF NEUTRAL START SWITCH
INSPECT SWITCH CONTINUITY
(a) Check that there is continuity between terminals 2 and 3 with the switch turned to "N" or "P" position.
(b) Check that there is no continuity between terminals 2 and 3 with the switch turned to "N" or "P" position.. If continuity is not as specified, replace the switch..
INSPECTION OF PARKING BRAKE SWITCH:
Parking Brake Switch
INSPECTION OF PARKING BRAKE SWITCH
INSPECT SWITCH CONTINUITY
(a) Check that there is continuity between terminal and screw hole with the parking brake lever pulled.
(b) Check that there is no continuity between terminal and screw hole with the parking brake lever returned. If continuity is not as specified, replace the switch.
INSPECTION OF SPEED SENSOR:
INSPECTION OF SPEED SENSOR:
Speed Sensor
INSPECTION OF SPEED SENSOR
INSPECT SENSOR CONTINUITY Check that there is continuity between terminals A-4 and A-5 four times per each revolution of the shaft. If continuity is not as specified, replace the sensor.
INSPECTION OF STOP LIGHT SWITCH:
Switch continuity between terminals.:
Stop Light Switch
INSPECTION OF STOP LIGHT SWITCH
INSPECT SWITCH CONTINUITY Inspect the switch continuity between terminals.
INSPECT CONTROL CABLE FREEPLAY:
Actuator
INSPECTION OF ACTUATOR
1. INSPECT CONTROL CABLE FREEPLAY Inspect that the control cable freeplay is less than 10 mm (0.39 in.). If necessary, adjust the control cable freeplay.
INSPECT ACTUATOR RESISTANCE:
2. INSPECT ACTUATOR RESISTANCE Using an ohmmeter, measure the resistance value between terminals as follows.
Resistance: 2-3 about 3O ohms 1 - 3 about 68 ohms
If the resistance value is not as specified above, replace the actuator.
INSPECT ACTUATOR OPERATION:
3. INSPECT ACTUATOR OPERATION Connect the positive (+) lead from the battery to terminals 1 and 2. Connect the negative (-) lead to terminal 1.
(a) Slowly apply vacuum from O - 300 mmHg (O-11.81 in.Hg, 0 - 40.0 kPa), and check that the control cable can be pulled smoothly.
(b) With the vacuum stabilized, check that the control cable does not return.
Check cable return:
(C) Disconnect terminal 1 or 2 and check that the control cable returns to its original position and the vacuum returns to 0 mmHg (0 in.Hg, 0 kPa). If operation is not as described, replace the actuator.