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Code I034: Loss Of PCM Data

  1. If this code is set with codes I033, I037, E047 and A037, see MULTIPLE DATA COMMUNICATION CODES. If this code is set by itself, IPC is not able to exchange data with PCM. Problem solution will be one of following.
    • An open in Tan wire circuit between IPC and PCM, and a second open between PCM and ACP.
    • An open in PCM power or ground circuits and this will also set a code E052.
    • A faulty PCM or PCM CAL-PAK. CAL-PAK is located inside PCM. PCM is located behind glove box, at top of right kick panel.
  2. Start engine. If engine DOES NOT start or there is serious driveability complaint, go to appropriate BASIC TESTING article in the ENGINE PERFORMANCE Section. If engine starts, turn engine off. Turn ignition on. Enter self-diagnostics. See ENTERING SELF-DIAGNOSTICS under SELF-DIAGNOSTICS.
  3. If code I034 sets as a history code (I034H), check for code E052(H). If E052H is also set, proceed to appropriate BASIC TESTING article in the ENGINE PERFORMANCE Section. If E052H is not set, there is an intermittent problem. Check for an open in Tan wire circuit between IPC and PCM. See Figure.
  4. If code I034 sets as a current code (I034C), remove PCM C2 harness connector (middle one). Using DVOM, measure voltage at PCM harness connector C2, terminal A8. See Figure. If voltage is not fluctuating between 3-5 volts, repair open or short in Tan wire circuit between IPC and PCM.
  5. If voltage is fluctuating between 3-5 volts, ensure terminals and connections are not damaged and that connectors fully seat into PCM. Ensure CAL-PAK is properly installed into PCM and that CAL-PAK pins are fully seated into PCM. If all connections are good and CAL-PAK is properly installed, replace faulty PCM. After all repairs are completed, clear all codes and verify correct operation.
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