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Home >> Cadillac >> 1998 >> Seville STS >> Repair and Diagnosis >> Suspension >> Electronic Suspension >> Suspension - Electronic CV Road-Sensing >> Diagnostic Tests >> Code C1744: Lift/Dive Signal Fault

Code C1744: Lift/Dive 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 on. Using DVOM, backprobe measuring voltage between lift/dive signal input circuit (Purple wire) of CVRSS control module connector C1 and ground. See WIRING DIAGRAMS  . If voltage is 4-6 volts, go to next step. If voltage is not 4-6 volts, go to step  8 .
  4. Install scan tool. Continue backprobing lift/dive signal input circuit (Purple wire) of CVRSS control module connector C1. Using scan tool, select MISC TESTS, and then MORE. Select RIDE CONTROL and command ride control to FIRM. Within 5 seconds, measure voltage between lift/dive signal input circuit (Purple wire) of CVRSS control module connector C1 and ground. See WIRING DIAGRAMS  . If voltage is less than one volt, go to step  7 . If voltage is more than one volt, go to next step.
  5. Store fluid life. Turn ignition off. Wait 30 seconds. Disconnect Powertrain Control Module (PCM) connector C1. Check for proper seating of lift/dive signal output circuit (Purple wire) at PCM connector. Disconnect 32-pin CVRSS control module connector C1. Check for open in lift/dive signal circuit (Purple wire). Repair as necessary. After repairs, go to next step. If circuit is okay, replace PCM.
  6. Repair open in lift/dive signal circuit (Purple wire). Reinstall/reconnect all components/connectors. Turn ignition on, with engine off. Clear all CVRSS codes.
  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.
  8. Store fluid life. Turn ignition off. Wait 30 seconds. Disconnect Powertrain Control Module (PCM) connector C1. Disconnect 32-pin CVRSS control module connector C1. Check for proper seating of lift/dive signal input circuit (Purple wire) at CVRSS control module connector. Check continuity between lift/dive signal input circuit (Purple wire) of CVRSS control module harness connector C1 to ground. See WIRING DIAGRAMS  . If a short to ground is present in circuit, go to next step. If a short to ground is not present in circuit, go to step  10 .
  9. Repair short to ground in lift/dive signal circuit (Purple wire). Reinstall/reconnect all components/connectors. Turn ignition on, with engine off. Clear CVRSS and PCM codes.
  10. Turn ignition on, with engine off. Using DVOM, measure voltage on lift/dive signal circuit (Purple wire). If voltage is less than 6 volts, go to step  7 . If voltage is more than 6 volts, go to next step.
  11. Repair short to voltage in lift/dive signal circuit (Purple wire). Reinstall/reconnect all components/connectors. Turn ignition on, with engine off. Clear CVRSS and PCM codes.
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