Vehicle Speed Sensor: Testing and Inspection
TROUBLESHOOTING HINTSIf there is damaged or disconnected wiring or a short-circuit in the vehicle speed sensor signal circuit, the engine may stall when the vehicle speed is reduced and the vehicle is stopped.
HARNESS INSPECTION
STEP 1. Check for continuity in the vehicle speed sensor output circuit.
- Engine control module connector: Disconnected
- Move the vehicle.
Continuity: Continuity and no-continuity are repeated alternately.
OK: GO TO STEP 4
NG: GO TO STEP 2
STEP 2. Check for an open or short-circuit between the vehicle speed sensor and the engine control module.
- Engine control module connector: Disconnected
- Vehicle speed sensor connector: Disconnected
OK: GO TO STEP 3
NG: Repair the harness. (A1 - 86)
STEP 3. Check for continuity in the ground circuit.
- Vehicle speed sensor connector: Disconnected
OK: GO TO STEP 4
NG: Repair the harness. (B13 - Ground)
STEP 4. Measure the applied voltage.
- Vehicle speed sensor connector: Disconnected
- Engine control module connector: Connected
- Ignition switch: ON
Voltage (V): 4.5 - 4.9
OK: STOP
NG: Replace the engine control module.
Vehicle Speed Sensor Check:
SENSOR CHECK
1. Remove the vehicle speed sensor and connect a 3 - 10 K Ohm resistance as shown in the illustration at left.
2. Turn the shaft of the vehicle speed sensor and check that there is voltage between terminal (2) and terminal (3). (1 turn = 4 pulses)