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Home >> Chevrolet >> 1998 >> Forward Control P30, 6.5 F, Standard >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 3 (Engine Controls - Tests W/Codes - 5.7L) >> Diagnostic Trouble Codes >> DTC U1041 - Loss Of EBCM Communication >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different variant/trim than selected.
  1. Perform POWERTRAIN ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK , then go to next step.
  2. Using scan tool, check if scan tool can communicate with EBCM. If scan tool can communicate with VCM, go to next step. If scan tool cannot communicate with EBCM, see ANTI-LOCK BRAKE SYSTEM article in BRAKES section.
  3. Using scan tool, select EBCM function. Check if DTC U1041 is stored in ATC memory. If DTC is stored, see ANTI-LOCK BRAKE SYSTEM article in BRAKES section. If DTC is not stored, go to next step.
  4. Check for short or open in Class II serial data circuit between VCM and ATC. Check for faulty connections at DLC, VCM or ATC. Repair as necessary. After repairs, go to step 8). If circuit or connections are okay, go to next step.
  5. Reconnect all components previously disconnected. Using scan tool, clear DTCs. Turn ignition off for 15 seconds. Turn ignition on, engine off. Check if DTC resets. If DTC resets, go to next step. If DTC does not reset, go to step 7).
  6. Replace VCM. Program replacement VCM using required equipment and perform VTD and Crankshaft Variation Learn Procedure. After replacing VCM, go to next step.
  7. DTC is intermittent. Check for additional DTCs. If additional DTCs are set, diagnose affected DTCs. If no additional DTCs are set, system is okay. See DIAGNOSTIC AIDS.
  8. Turn ignition off. Reconnect all disconnected components. Using scan tool, clear all DTCs. Check if DTC resets. If DTC resets, repeat step 1). If DTC does not reset, system is okay.
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