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Home >> Saturn >> 2000 >> LS Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0502: VSS Circuit - Low Input (M/T With Abs) >> Diagnostic Procedures

Diagnostic Procedures

  1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. After performing OBD system check, go to next step.
  2. Drive vehicle. Using scan tool, monitor vehicle speed. If vehicle speed is displayed, problem is intermittent. See DIAGNOSTIC AIDS . If vehicle speed is not displayed, go to next step.
  3. Turn ignition off. Disconnect EBTCM harness connector located on left rear of engine compartment. Turn ignition on. Connect a jumper wire to EBTCM harness connector terminal No. 26 (White wire) and quickly touch other end of jumper wire to ground. Observe vehicle speed reading scan tool. If vehicle speed changes, check for terminal tightness in connectors. Repair as necessary. If terminals are okay, replace EBTCM. If vehicle speed does not change, go to next step.
  4. Measure voltage between ground and EBTCM harness connector terminals No. 26 (White wire). If voltage reading is 0-4 volts, check for terminal tightness or open or short in White wire circuit. Repair as necessary. If circuit or terminals are okay, replace PCM. If voltage reading is 4-6 volts, replace PCM. If voltage reading is greater than 6 volts, check for short to voltage in White wire circuit. Repair as necessary. If circuit is okay, replace PCM.
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