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Home >> Chevrolet >> 2000 >> Venture Value >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls Self-Diagnostics >> Diagnostic Tests >> DTC P1585: Cruise Control Inhibit Output Circuit >> Diagnostic Procedures
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Diagnostic Procedures

  1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC SYSTEM CHECK . After performing OBD system check, go to next step.
  2. Turn ignition off. Disconnect PCM harness connector. Turn ignition on. Using a DVOM, check voltage between ground and cruise control module control circuit at PCM harness connector. If battery voltage is present, go to next step. If battery voltage is not present, go to step  6.
  3. Connect DVOM between ground and cruise control inhibit control circuit at PCM harness connector. Monitor reading for about 2 minutes. If current reading is .001-.500 amp, go to step  11. If current reading is not .001-.500 amp, go to next step.
  4. Turn ignition off. Disconnect cruise control module harness connector. Ensure PCM harness connector is disconnected. Turn ignition on. Check voltage between ground and cruise inhibit control circuit. If voltage reading is zero volts, go to step  10. If voltage reading is not zero volts, go to next step.
  5. Locate and repair short to voltage in cruise inhibit control circuit. After repairs, go to step  16.
  6. Turn ignition off. Check ignition feed fuse for cruise control module. If fuse is blown, go to next step. If fuse is not blown, go to step  8.
  7. Repair short to ground in ignition feed circuit for cruise control module. Repair as necessary. Replace fuse. After repairs, go to step  16.
  8. Disconnect cruise control module harness connector. Turn ignition on. Check voltage between ground and ignition feed circuit for cruise control module. If battery voltage is present, go to next step. If battery voltage is not present, go to step  13.
  9. Check cruise inhibit control circuit for open or short to ground. Repair as necessary. After repairs, go to step  16. If circuit is okay, go to next step.
  10. Check cruise inhibit control circuit for poor connection at PCM and at stepper motor cruise control module. Repair as necessary. After repairs, go to step  16. If connections are okay, go to step  14.
  11. Turn ignition off. Reconnect PCM harness connector. Disconnect stepper motor cruise control module harness connector. Turn ignition on. Using a test light, connect test light between cruise inhibit control circuit and ignition feed circuit at stepper motor cruise control module harness connector. Using scan tool in OUTPUT TEST function, cycle cruise inhibit output on and off. If test light flashes on and off, see DIAGNOSTIC AIDS . If test light does not flash on and off, go to next step.
  12. Check cruise control inhibit circuit for poor connection at PCM. Repair as necessary. After repairs, go to step  16. If connection is okay, go to step  15.
  13. Repair open in ignition feed circuit to stepper motor cruise control module. After repairs, go to step  16.
  14. Replace cruise control module. After replacing module, go to step  16.
  15. Replace PCM. Program replacement PCM using required equipment. After replacing PCM, go to next step.
  16. Using scan tool, select DTC, CLEAR INFO function. Start and warm engine to normal operating temperature. Select DTC, SPECIFIC, then enter this DTC. Operate vehicle within conditions for setting this DTC. If scan tool indicates that this test ran and passed, system is okay. If scan tool does not indicate that this test ran and passed, repeat step  2.
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