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Home >> Nissan-Datsun >> 2002 >> Sentra SE-R, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics - 2.5 >> Diagnostic Tests >> DTC P1574: Automatic Speed Control Device (ASCD) Vehicle Speed Sensor >> Diagnostic Procedure
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Diagnostic Procedure

  1. Check if DTC is set in TCM. If TCM DTC is set, troubleshoot relevant to DTC indicated. If TCM DTC is not set, go to next step.
  2. Check vehicle speed sensor signal circuit. Remove VSS from transaxle. With DVOM set to AC voltage measure voltage between terminals + and - while turning sensor pinion clockwise rapidly. There should be approximately 0.5 volt AC. If voltage is as specified. reinstall sensor and connector, then go to next step. If voltage is not as specified, repair or replace sensor.
  3. Check the function of the combination meter. Speedometer is (all gauges are) controlled by control unit built into combination meter. Power is supplied at all times through fuse No. 12 (10-amp) located in fuse block at left end of dash to combination meter connector terminal No. 25 (without tach) or No. 42 (with tach). With ignition on power is supplied to combination meter through fuse No. 30 (10-amp) located in fuse block at left end of dash to combination meter connector terminal No. 26 (without tach) or No. 41 (with tach). Ground to body for combination meter comes from connector terminal No. 27 (without tach) or No. 48 (with tach). The combination meter receives a voltage signal from VSS connector terminal + to combination meter connector terminal No. 29 (without tach) or No. 47 (with tach) for the speedometer. The speedometer converts the voltage into the vehicle speed displayed. Test drive vehicle. If speedometer operates properly, inspection is done. If speedometer does not operate, check the above mentioned harness wires and connectors for damage, open or short circuits. Repair or replace if necessary. If harness wires and connectors are OK. install a known-good combination meter, and recheck speedometer operation. If speedometer operates properly, replace combination meter. If speedometer does not operate properly, reinstall original combination meter and replace speedometer.
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