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Home >> Chevrolet >> 1998 >> Corvette 2D Convertible, Standard >> Repair and Diagnosis >> Suspension >> Electronic Suspension >> Suspension - Electronic Real Time Damping >> Diagnostic Tests >> DTC C1744: Loss Of Chassis Pitch Input

DTC C1744: Loss Of Chassis Pitch Input

The ESC module receives a chassis pitch input from PCM at ESC terminal C5 (Pink/White) on connector C2. Under normal conditions, this signal is battery voltage. PCM grounds this circuit under hard acceleration, or hard braking. When voltage on C5 goes low, ESC module commands all 4 shock absorbers to a full firm position. As a self test feature, once the ignition switch is turned to ON position, ESC module sends a request for chassis pitch to PCM on serial data line. PCM then grounds terminal C5 for 5 seconds, and then restores battery voltage. DTC C1744 will be set if after the ignition switch is turned to the RUN position, the ESC does not detect a reply on the chassis pitch wire (C5) from the PCM within 31 seconds of the request on the serial data line. Every 4 minutes, ESC will send a new request to PCM. If PCM does not respond within 31 seconds, DTC C1744 will remain set. ESC module will send a request to IPC to display SERVICE RIDE CONTROL message while this code is set.

  1. Perform RTD diagnostic system check. See RTD DIAGNOSTIC SYSTEM CHECK  under DIAGNOSIS & TESTING. After performing RTD system check, go to next step.
  2. Using scan tool, monitor chassis pitch status. If chassis pitch status is ACTIVE, go to next step. If chassis pitch status is not ACTIVE, go to step  4 .
  3. Disconnect Powertrain Control Module (PCM) connector C1 (Red connector). Monitor chassis pitch status. If chassis pitch status is ACTIVE, go to step  5 . If chassis pitch status is not ACTIVE, go to step 7 .
  4. Turn ignition on. Using fused jumper wire, backprobe RTD control module connector C2, terminal C5 (Pink/White wire) to ground. Monitor chassis pitch status. If chassis pitch status is ACTIVE, go to step  8 . If chassis pitch status is not ACTIVE, go to step  6 .
  5. Check for short to ground in Pink/White wire (circuit No. 1101) and repair as necessary. See WIRING DIAGRAMS  . After repairs, go to step  10 . If Pink/White wire is okay, go to step  9 .
  6. Check for open in Pink/White wire (circuit No. 1101) and repair as necessary. See WIRING DIAGRAMS  . After repairs, go to step  10 . If Pink/White wire is okay, go to next step.
  7. Check PCM for proper operation. See OBD SYSTEMS CHECK in appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. After repairs, go to step  10 . If PCM is functioning properly, go to step  9 .
  8. Check chassis pitch circuit (No. 1101, Pink/White wire) for an intermittent. See NOTES ON INTERMITTENTS  under DIAGNOSIS & TESTING. After repairs, go to step  10 . If no problem was found, go to step  7 .
  9. Replace RTD control module. See RTD CONTROL MODULE  under REMOVAL & INSTALLATION. After repairs, go to next step.
  10. Turn ignition off. Reinstall/reconnect all components/connectors. Using scan tool, clear all DTCs.
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