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HOMESERVICE MANUALSCHEVROLET1999CUTAWAY 7.4 JREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROL SYSTEM - TESTS W/CODES - DTC P0205-P0351DTC P0322DTC P0322: IGNITION CONTROL (IC) MODULE 4X REFERENCE CIRCUIT-NO FREQUENCY (4.0L "G" BODY & 4.6L "E" & "K" BODIES)DIAGNOSTIC PROCEDURES
1999 Chevrolet Cutaway 7.4 J

Diagnostic Procedures

1999 Chevrolet Cutaway 7.4 JSECTION Diagnostic Procedures
  1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS INTRODUCTION article. 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 harness 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 not 10,000 ohms or greater, 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 not 5 ohms or less, 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 0.5 volt or less, go to next step. If voltage reading is not 0.5 volt or less, 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 reading is 4.1 volts or greater, go to next step. If voltage reading is not 4.1 volts or greater, 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 Hz, go to step  16. If frequency is not 30-100 Hz, go to step  15.
  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 not greater than 80 kPa, go to step  11.
  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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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.