PGM-FI Control System — Troubleshooting Flowchart — Vehicle Speed Sensor
6-56flowchartTroubleshooting Flowchart — Vehicle Speed Sensor
Self-diagnosis LED indicator blinks seventeen times: A problem in the Vehicle Speed Sensor circuit.
WARNING
Block rear wheels before jacking up front of car.
1
- Check Engine warning light is on.
- LED indicates CODE 17.
2
Block rear wheels and set the parking brake. Jack up the front of the car and support with safety stands.
3
Connect the PGM-FI test harness between the ECU and connector (page 6-19).
4
Turn the ignition switch ON.
5
Slowly rotate left front wheel and measure voltage between B16 (+) terminal and A18 (-) terminal.
6
Does voltage pulse 0V and 5V ?
NO
- Repair open or short in YEL/RED wire between ECU (B16) and the speed sensor.
- Repair open or short in YEL/RED wire between ECU (B16) and the speed sensor.
- Faulty speed sensor.
YES
Substitute a known-good ECU and recheck. If symptom/indication goes away, replace the original ECU.