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Home >> Cadillac >> 1998 >> Seville STS >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Tests W/Codes >> Diagnostic Trouble Codes >> DTC P1654 - Cruise Disable Output Circuit >> Diagnostic Procedures

Diagnostic Procedures

  1. Perform POWERTRAIN ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK , then go to next step.
  2. Turn ignition on. Using scan tool, select ENGINE 3 mode and note CRUISE ENABLE DRIVER display. If scan tool display indicates OK, go to next step. If scan tool display does not indicate OK, go to step 6).
  3. Store fluid life index as indicated on scan tool. Turn ignition off and wait 30 seconds, then disconnect PCM harness connector C1. Turn ignition on. Using DVOM, check voltage between ground and cruise inhibit output circuit at PCM harness connector C1. If voltage reading is 10 volts or greater, fault is not present. See DIAGNOSTIC AIDS. If voltage reading is not 10 volts or greater, go to next step.
  4. Turn ignition off. Disconnect cruise control module harness connector. Check resistance between ground and cruise control module harness connector terminal "H". If resistance is 5 ohms or less, go to step 8). If resistance is not 5 ohms or less, go to step 9).
  5. Check resistance of cruise inhibit output circuit between cruise control module harness connector and PCM harness connector terminals. If resistance is 5 ohms or less, go to step 7). If resistance is not 5 ohms or less, go to step 9).
  6. Store fluid life index as indicated on scan tool. Turn ignition off and wait 30 seconds, then disconnect PCM harness connector C1. Disconnect cruise control module. Turn ignition on. Using DVOM, check voltage between ground and cruise inhibit output circuit at PCM harness connector C1 terminal. If voltage reading is 10 volts or greater, go to step 10). If voltage reading is not 10 volts or greater, go to step 14).
  7. Turn ignition on. Check voltage to ground at cruise control module terminal "F". If voltage reading is 10 volts or greater, go to step 12). If voltage reading is not 10 volts or greater, go to step 11).
  8. Repair short to ground in cruise inhibit output circuit.
  9. Repair open in cruise inhibit output circuit.
  10. Repair short to voltage in cruise inhibit output circuit.
  11. Repair open or short to ground (if fuse is blown) in ignition circuit to TCC brake switch and to cruise control module.
  12. Check terminal contact at cruise control module. Repair as necessary. If terminal contact is okay, go to next step.
  13. Replace cruise control module.
  14. Check terminal contact at PCM. Repair as necessary. If terminal contact is okay, go to next step.
  15. Replace PCM. Program replacement PCM using required equipment. After replacing PCM, go to next step.
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