Testing Speed Sensor Signal Check
- To check power source, turn ignition switch on. Check voltage between terminal No. 1 and ground. See Figure
. If battery voltage is present, go to step 3).
- If battery voltage is NOT present, check for blown fuse or fusible link. Check harness continuity between battery terminal and combination meter. Check ignition relay and/or ignition switch for malfunction.
- Check harness connector continuity between terminal No. 5 and ground. If continuity exists, go to next step. If continuity does NOT exist, repair wire harness and/or connectors.
- Check harness continuity between terminal No. 3 and speed sensor terminal "A". See Fig 1
. Check for continuity between terminal No. 2 and speed sensor terminal "B". If continuity exists, go to next step. If continuity does NOT exist in either test, repair wire harness/connectors between speed sensor and combination meter.
Courtesy of NISSAN MOTOR CO., U.S.A.
- Remove speed sensor from transmission. Turn speedometer pinion quickly and measure voltage across sensor terminals. Voltage should be about .5 volt (AC). If voltage reading is okay, go to next step. If reading is incorrect, replace speed sensor.
- Install speed sensor. Jack up one rear wheel. Turn ignition switch on. Turn rear wheel by hand and measure voltage between terminal No. 6 and ground. Voltage should be about .5 volt (AC). If voltage reading is correct, replace speedometer.