Cruise Control Servo: Testing and Inspection

2D1: CHECK FUNCTION OF ACTUATOR.




1. Disconnect vacuum hose from actuator.




2. Connect vacuum pump as shown in figure.
3. Make sure that cruise control cable moves smoothly and quickly when a vacuum pressure of 40.0 kPa (300 mmHg, 11.81 in.Hg) is applied to actuator.

CHECK : Does cruise control cable have a stroke of 35 mm (1.38 in)?
YES : Go to step 2D2.
NO : Replace actuator. Go to step 202.

NOTE:
- When vacuum pressure is released from condition 3) above, make sure the cable returns to its original position smoothly and quickly.
- After inspection, disconnect vacuum pump and connect vacuum hose.

2D2: MEASURE RESISTANCE OF VALVE.
1. Disconnect connector from actuator.
2. Measure resistance between terminals of actuator.

Terminals: No. 2 - No. 3:

Terminals
No.2 - No.3:

CHECK : Is resistance less than 100 ohms?
YES : Go to step 2D3.
NO : Replace actuator.

2D3: MEASURE RESISTANCE OF VALVE.
Measure resistance between terminals of actuator.

Terminals: No. 2 - No. 1:

Terminals
No.2 - No.1:

CHECK : Is resistance less than 69 ohms?
YES : Go to step 2D4.
NO : Replace actuator.

2D4: MEASURE RESISTANCE OF VALVE.
Measure resistance between terminals of actuator.

Terminals: No. 2 - No. 4:

Terminals
No.2 - No.4:

CHECK : Is resistance less than 69 ohms?
YES : Go to step 2D5.
NO : Replace actuator.




2D5: CHECK FOR LEAKAGE AND STICKING OF VALVES.
1. Disconnect connector from actuator.
2. Make sure that cruise control cable moves smoothly when connecting + (positive) battery cable to terminal No.2 and - (negative) battery cable to terminals No.1, 3 and 4 of actuator connector.

CHECK : Does cruise control cable have a stroke of 35 mm (1.38 in) within 3 seconds?
YES : Go to step 2D6.
NO : Replace actuator. Go to step 2D6.

2D6: CHECK FOR LEAKAGE AND STICKING OF VALVES.
When the battery cable is disconnected from former condition , make sure the cable returns to its original position smoothly.

CHECK : Does cruise control cable get back to its original position within 1.5 seconds?
YES : Go to step 2D7.
NO : Replace actuator. Go to step 2D7.




2D7: CHECK CABLE MOVEMENT.
Connect + (positive) battery cable to terminal No. 2 and - (negative) battery cable to terminals No.1, 3 and 4 of actuator connector.

CHECK : Does cruise control perform pull operation?
YES : Go to step 2D8.
NO : Replace actuator. Go to step 2D8.




2D8: CHECK CABLE MOVEMENT.
Connect + (positive) battery cable to terminal No. 2 and - (negative) battery cable to terminals No.1 and 4 of actuator connector.

CHECK : Does cruise control perform hold operation?
YES : Go to step 2D9.
NO : Replace actuator. Go to step 2D9.




2D9: CHECK CABLE MOVEMENT.
Connect + (positive) battery cable to terminal No. 2 and - (negative) battery cable to terminal No.4 of actuator connector.

CHECK : Does cruise control perform release operation?
YES : Go to step 2E1.
NO : Replace actuator. Go to step 2E1.