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Home >> Saturn >> 2001 >> L100 Automatic >> 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

NOTE: If ABS DTC C0040 is also set, diagnose this DTC first. See appropriate ANTI-LOCK article in BRAKES.
  1. 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.
  2. Turn ignition off. Disconnect EBTCM harness connector located on left rear of engine compartment. Turn ignition on. Using a test light connected to ground, quickly tap EBTCM harness connector terminal No. 26 (White wire). See Figure. Observe vehicle speed reading scan tool. If vehicle speed changes, check for loose connection in connectors. Repair as necessary. If terminals are okay, replace EBTCM. If vehicle speed does not change, go to next step.
  3. Measure voltage between ground and EBTCM harness connector terminals No. 26 (White wire). If voltage reading is 0-4 volts, check for loose connection 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 more than 6 volts, check for short to voltage in White wire circuit. Repair as necessary.
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