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Home >> Cadillac >> 1996 >> Eldorado Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Tests W/Codes >> Diagnostic Trouble Codes >> DTC P1652 - Lift/Dive Output Circuit >> Diagnostic Procedures
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Diagnostic Procedures

  1. Perform On-Board Diagnostic (OBD) System Check. After performing OBD system check, go to next step.
  2. Turn ignition on. Using scan tool in ENGINE 3 mode, note PCM RIDE CONTROL DRIVER display. If scan tool display indicates OK, go to next step. If scan tool display does not display OK, go to step 5).
  3. Start and idle engine. In MISC TESTS, select MORE then RIDE CONTROL. Command the ride control FIRM. If PCM RIDE CONTROL DRIVER display indicates OK, fault is not present. See DIAGNOSTIC AIDS. If display does not indicate OK, go to next step.
  4. Turn ignition to LOCK position. Disconnect RSS module harness connector. Turn ignition on. Using DVOM, check voltage between ground and RSS module harness connector terminal. If voltage reading is .5 volt or greater, go to step 8). If voltage reading is less than .5 volt, go to next step.
  5. 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 lift/dive signal output circuit at PCM harness connector C1. If voltage reading is 10 volts or greater, go to step 12). If voltage reading is less than 10 volts, go to next step.
  6. Turn ignition to LOCK position. Disconnect RSS module harness connector. Check resistance between ground and RSS module harness connector terminal. If resistance is 10,000 ohms or less, go to step 9). If resistance is greater than 10,000 ohms, go to next step.
  7. Check lift/dive signal output circuit resistance between PCM harness connector and RSS module harness connector terminals. If resistance is 5 ohms or less, go to step 11). If resistance is greater than 5 ohms, go to step 11).
  8. Repair short to voltage in lift/dive signal output circuit.
  9. Repair short to ground in lift/dive signal output circuit.
  10. Repair open in lift/dive signal output circuit.
  11. Check terminal contact at RSS module. Repair as necessary. If terminal contact is okay, diagnose RSS system. See SUSPENSION - ELECTRONIC (ROAD SENSING) article in the SUSPENSION section.
  12. Check terminal contact at PCM harness connector C1. Repair as necessary. If terminal contact is okay, go to next step.
  13. Replace PCM. Program replacement PCM using required equipment.
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