Cruise Control System

DIAGNOSIS:
Disconnection or short circuit of vehicle speed sensor system

Wiring Diagram:

WIRING DIAGRAM

8C1: CHECK TRANSMISSION TYPE.

CHECK: Is the transmission type MT?

YES: Go to step 8C2.

NO: Go to step 8C6.

8C2: CHECK HARNESS CONNECTOR BETWEEN CRUISE CONTROL MODULE AND VEHICLE SPEED SENSOR.
1. Disconnect connector from vehicle speed sensor and cruise control module.

Connector & Terminal - [(B17) No.1 - (B94) No.19]:

2. Measure resistance of harness connector between vehicle speed sensor and cruise control module.

CHECK: Is the resistance less than 10 Ohms?

YES: Go to step 8C3.

NO: Repair wiring harness.

8C3: CHECK HARNESS CONNECTOR BETWEEN BATTERY AND VEHICLE SPEED SENSOR.
1. Turn ignition switch to ON.

Connector & Terminal - [(B17) No.3 (+) - Chassis Ground (-)]:

2. Measure voltage between vehicle speed sensor connector (B17. and chassis ground.

CHECK: Is the voltage more than 10 V?

YES: Go to step 8C4.

NO: Repair harness connector between battery and vehicle speed sensor.

8C4: CHECK HARNESS CONNECTOR BETWEEN VEHICLE SPEED SENSOR AND ENGINE GROUND.
1. Turn ignition switch to OFF.

Connector & Terminal - [(B17) No.2 (+) - Engine Ground (-)]:

2. Measure resistance between vehicle speed sensor connector (B17. and engine ground.

CHECK: Is the resistance less than 10Ohms?

YES: Go to step 8C5.

NO: Repair harness connector between vehicle speed sensor and engine ground.

8C5: CHECK VEHICLE SPEED SENSOR.
1. Connect connector to vehicle speed sensor.
2. Set the vehicle on free roller, or lift-up the vehicle and support with safety stands.

WARNING: Be careful not to be caught up by the running wheels.




3. Set oscilloscope to vehicle speed sensor connector terminals.
Positive probe; (B17. No.1
Earth lead; (B17. No.2

4. Drive the vehicle at speed greater than 20 km/h 12 MPH).




5. Measure signal voltage indicated on oscilloscope.

CHECK: Is the voltage more than 5 V?

YES: Replace cruise control module.

NO: Replace vehicle speed sensor.

8C6: CHECK HARNESS CONNECTOR BETWEEN CRUISE CONTROL MODULE AND AUTOMATIC TRANSMISSION CONTROL MODULE.
1. Disconnect connector from automatic transmission control module and cruise control module.

Connector & Terminal - [(B94) No.19 - (B55) No.13]:

2. Measure resistance between cruise control module connector and automatic transmission control module connector.

CAUTION: To measure the voltage and/or resistance, use a tapered pin with a diameter of less than 0.64 mm (0.025 in). Do not insert the pin more than 5 mm (0.20 in).

CHECK: Is the resistance less than 10 Ohms?

YES: Go to step 8C7.

NO: Repair harness connector between cruise control module and automatic transmission control module.

8C7: CHECK AUTOMATIC TRANSMISSION CONTROL MODULE.
1. Connect connector to automatic transmission control module.
2. Set the vehicle on free roller, or lift-up the vehicle and support with safety stands.

WARNING: Be careful not to be caught by the running wheels.

3. Drive the vehicle faster than 10 km/h (6 MPH).

Connector & Terminal - [(B55) No.13 (+) - Chassis Ground (-)]:

4. Measure voltage between automatic transmission control module connector (B55. and chassis ground.

CAUTION: To measure the voltage and/or resistance, use a tapered pin with a diameter of less than 0.64 mm (0.025 in). Do not insert the pin more than 5 mm (0.20 in).

CHECK: Is the voltage less than 1 V <--> more than 4 V?

YES: Replace cruise control module.

NO: Replace automatic transmission control module.