LEMON Manuals: Even more car manuals for everyone
Home >> GMC >> 1997 >> Forward Control 4.3 W, L35, Automatic >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 11 (Engine Controls - Tests W/Codes - 7.4L (P Series)) >> Diagnostic Trouble Codes >> DTC P0704 - Clutch Switch Circuit (With Manual Transmission) >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different variant/trim than selected.
  1. Perform ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK. See the F - BASIC TESTING - 7.4L article. After performing OBD system check, 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 change indicates when clutch is engaged and disengaged, go to step 7). If scan tool display change does not indicate when clutch is engaged and disengaged, go to next step.
  3. Check if brake fuse is blown, go to step 8). If fuse is not blown, go to next step.
  4. 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 clutch switch is on, go to next step. If scan tool indicates clutch switch is off, go to step 6).
  5. Remove jumper wire from clutch switch connector. Using scan tool, check if clutch switch is off. If scan tool indicates clutch switch is off, go to step 11). If scan tool indicates clutch switch is on, go to step 9).
  6. Check for open in signal circuit. If a problem was found, go to step 12). If a problem was not found, go to step 10).
  7. DTC is intermittent. See the TESTS W/O CODES article.
  8. Check and repair conditions that caused fuse to blow. Replace fuse. After replacing fuse, go to step 14).
  9. Check for short to battery in signal circuit. If a problem was found, go to step 12). If a problem was not found, go to step 13).
  10. Check for poor connections at VCM. If a problem was found, go to step 12). If a problem was not found, 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 DTC P0704. 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 DTC(s) are displayed, go to applicable DTC test.
scientia non olet · About LEMON Manuals