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Home >> Chevrolet >> 1998 >> Forward Control P30, 6.5 F, Standard >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 4 (Engine Controls - Tests W/Codes - 7.4L) >> Diagnostic Trouble Codes >> DTC P0704 - Clutch Switch Circuit >> 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. Turn ignition off. Install scan tool. Turn ignition on, with engine off. Using scan tool, display clutch switch parameter. Engage and disengage clutch several times. If scan tool display changes when clutch is engaged and disengaged, go to next step. If scan tool display does not change when clutch is engaged and disengaged, go to step 4).
  3. DTC is intermittent. Check if additional DTCs are set. Diagnose affected DTCs. If no additional DTCs are set, see DIAGNOSTIC AIDS.
  4. Check if brake fuse is blown, go to step 8). If fuse is okay, go to next step.
  5. Turn ignition off. Disconnect clutch switch connector. Connect a jumper wire between ignition feed circuit and signal circuit of clutch switch connector. Turn ignition on, with engine off. Using scan tool, check if clutch switch is on. If scan tool indicates that clutch switch is on, go to next step. If scan tool does not indicate that clutch switch is on, go to step 7).
  6. Remove jumper wire from clutch switch connector. Using scan tool, check if clutch switch is off. If scan tool indicates that clutch switch is off, go to step 11). If scan tool does not indicate that clutch switch is off, go to step 9).
  7. Check for short to ground in brake fuse circuit. If problem is found, go to step 12). If circuit is okay, go to step 10).
  8. Check brake fuse circuit for short to ground. Repair as necessary. Replace fuse. After repairs, go to step 14).
  9. Check for short to battery voltage on clutch switch signal circuit. If problem is found, go to step 12). If circuit is okay, go to step 13).
  10. Check for poor connections in clutch signal circuit at VCM connector. If a problem is found, go to step 14). If connection is okay, go to step 13).
  11. Replace clutch switch. After replacing switch, go to step 14).
  12. Repair as necessary. After repairs, go to step 14).
  13. Replace VCM. Program replacement VCM using required equipment. After replacing VCM, go to next step.
  14. Using scan tool, select DTC, CLEAR INFO. Start and warm engine to normal operating temperature. Select DTC, SPECIFIC, then enter this DTC. Operate vehicle within the conditions for setting this DTC. If scan tool indicates that this test ran and passed, go to next step. If scan tool does not indicate that this test ran and passed, repeat step 2).
  15. Using scan tool, select CAPTURE INFO, REVIEW INFO. If any undiagnosed DTCs are displayed, go to applicable DTC test.
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