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Home >> Cadillac >> 1999 >> Seville STS >> Repair and Diagnosis >> Suspension >> Electronic Suspension >> Suspension - Electronic CV Road-Sensing >> Diagnostic Tests >> Code C1743: Speed Signal Fault

Code C1743: Speed Signal Fault

  1. Perform CVRSS system check. See CVRSS SYSTEM CHECK  . After performing CVRSS system check, go to next step.
  2. If Code P1642 is set, go to Code P1642 for diagnosis. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. If Code P1642 is not set, go to next step.
  3. Turn ignition off. Disconnect 32-pin CVRSS control module connector C1. Disconnect 23-pin splice C205 connector located behind right side of instrument panel, near kick panel. Check continuity between vehicle speed input circuit (Dark Green/White wire) of splice C205 connector (PCM side) and CVRSS control module harness connector C1. See WIRING DIAGRAMS  . If continuity exists, go to next step. If continuity does not exist, go to step  6 .
  4. Check for intermittent open in vehicle speed input circuit (Dark Green/White wire). If circuit is okay, go to next step.
  5. Reinstall/reconnect all components/connectors. Turn ignition on. Clear codes. Drive vehicle faster than 20 MPH for more than 10 seconds. Display codes. If Code C1743 is set, go to step  7 . If Code C1743 is not set, see NOTES ON INTERMITTENTS  under DIAGNOSIS & TESTING.
  6. Repair open in vehicle speed input circuit (Dark Green/White wire).
  7. Turn ignition off. Replace CVRSS control module. Reinstall/reconnect all components/connectors. Install scan tool. Turn ignition on, with engine off. Calibrate NEW CVRSS control module. See CALIBRATING CVRSS CONTROL MODULE  under ADJUSTMENTS.
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