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Home >> Cadillac >> 1996 >> Eldorado Base >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System - Tests W/Codes >> Diagnostic Trouble Codes >> DTC P0322 - Ignition Control (Ic) Module 4X Reference Circuit No Frequency >> 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. Using scan tool, check if DTC P1376 is also present. If DTC P1376 is present, diagnose this DTC first. If DTC P1376 is not present, go to next step.
  3. Start and idle engine. Using scan tool, select DTC INFO then FAIL THIS IGN. in DTC mode. If DTC P0322 is indicated as current, go to next step. If DTC P0322 does not indicate as current, go to step 9).
  4. Store fluid life data as indicated on scan tool. Turn ignition off and wait 30 seconds, then disconnect PCM connector C2. Disconnect Ignition Control (IC) module harness connector C4. Using DVOM, check resistance between ground and IC module harness connector fuel control circuit terminal. If resistance is 10,000 ohms or greater, go to next step. If resistance is less than 10,000 ohms, go to step 9).
  5. Check resistance between PCM harness connector fuel control circuit terminal and IC module harness connector C4 fuel control circuit terminal. If resistance is 5 ohms or less, go to next step. If resistance is 5 ohms or greater, go to step 13).
  6. Turn ignition on. Check voltage to ground at IC module harness connector C4 fuel control circuit terminal. If voltage reading is .5 volt or less, go to next step. If voltage reading is greater than .5 volt, go to step 14).
  7. Reconnect IC module harness connector C4. Check voltage to ground at PCM harness connector C4 cam signal circuit terminal. If voltage is 4.1 volts or greater, go to next step. If voltage is less than 4.1 volts, go to step 15).
  8. Turn ignition off. Reconnect PCM harness connector C2. Using 6-Pin IC Module Diagnostic Jumpers, jumper the following IC module connector C4 terminals to the following module terminals:
    • C4 Terminal "A" To Module Pin "A"
    • C4 Terminal "B" To Module Pin "B"
    • C4 Terminal "C" To Module Pin "C"
    • C4 Terminal "D" To Module Pin "D"
    • C4 Terminal "E" To Module Pin "E"
    • C4 Terminal "F" To Module Pin "F"

    Set DVOM to amp scale. Connect DVOM between terminal "C" jumper. Start engine and check frequency in terminal "C" jumper. If frequency is 30-100 Hertz, go to step 16). If not 30-100 Hertz, go to step 15).

  9. 9) Using DVOM, check FAILURE REC. for DTC P0322 and note MAP value when DTC was set. If MAP value is greater than 80 kPa, go to next step. If MAP value is less than 80 kPa, go to step 11).
  10. 10) Check for intermittent short to voltage or for Electromagnetic Interference (EMI) on cam sensor wires. EMI can be caused by wiring being too close to spark plug wires or high power transmitters operating within vicinity. DTC can also be set by battery charger. Repair or correct problem as necessary. If circuits are okay and if the other conditions are not present, fault is not present.
  11. Check for intermittent open or short in fuel control circuit between PCM and IC module connectors. Also check circuit to DIS fuse. Repair as necessary.
  12. Repair short to ground in fuel control circuit.
  13. Repair open in fuel control circuit.
  14. Repair short to voltage in fuel control circuit.
  15. Replace IC module.
  16. Check terminal contact at fuel control circuit terminal at PCM harness connector. Repair as necessary. If terminal contact is okay, go to next step.
  17. Replace PCM. Program replacement PCM using required equipment.
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