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Home >> Cadillac >> 1998 >> 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 POWERTRAIN ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK , then go to next step.
  2. Turn ignition on. Using scan tool, check PCM ride control output signal display. If display indicates OK, go to next step. If display does not indicate OK, go to step 5).
  3. Start and operate engine at idle. Using scan tool, command ride control to "firm". If display indicates OK, fault is not present. See DIAGNOSTIC AIDS. If display does not indicate OK, go to next step.
  4. Turn ignition off. Disconnect RSS module harness connector. Turn ignition on. Using DVOM, check voltage between ground and RSS module connector terminal A7. If voltage reading is 0.5 volt or greater, go to step 8). If voltage reading is not 0.5 volt or greater, go to step 12).
  5. Store fluid life index. Turn ignition off. Wait 30 seconds, then disconnect PCM harness connector C1. Turn ignition on. Check voltage between ground and PCM harness connector C1 terminal No. 24. If voltage reading is 10 volts or greater, go to step 12). If voltage reading is not 10 volts or greater, go to next step.
  6. Turn ignition off. Disconnect RSS harness connector. Check resistance between ground and RSS module harness connector terminal A7. If resistance is 10,000 ohms or less, go to step 9). If resistance is not 10,000 ohms or less, go to next step.
  7. Check resistance between PCM harness connector C1 terminal No. 24 and RSS module harness connector terminal A7. If resistance is 5 ohms or less, go to step 11). If resistance is not 5 ohms or less, go to step 10).
  8. Repair short to voltage on circuit No. 1490.
  9. Repair short to ground on circuit No. 1490.
  10. Repair open in circuit No. 1490.
  11. Check terminal contact at RSS module. Repair as necessary. If repair is not required, diagnose RSS system.
  12. Check for faulty terminal contact at PCM harness connector C1 terminal No. 24. Repair as necessary. If repair is not required, go to next step.
  13. Replace PCM. Program replacement PCM using required equipment.
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