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Home / DTC / P1F05 — ETV/CC monitoring-ROM

P1F05 — ETV/CC monitoring-ROM

Detailed page for trouble code P1F05.

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Code

P1F05

MITSUBISHI P — Powertrain

ETV/CC monitoring-ROM

Brand: MITSUBISHI
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Corrupted or corrupted ECU/PCM ROM or firmware
  • Failed or intermittent ECU/PCM internal memory
  • Low or unstable battery/charging system voltage during key-on or programming
  • Water intrusion, corrosion or physical damage to ECU or connectors
  • Failed ECU processor or internal hardware fault
  • Aftermarket tuning or incorrect reflash/programming

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Cruise control disabled or inoperative
  • ETV / throttle control warnings or reduced engine power / limp-home mode
  • Possible stored or persistent related DTCs (communication or ECU memory faults)
  • Inconsistent throttle response or loss of driveability (if ECU locks to safe mode)

What to check

  • Read and record all stored codes and freeze-frame data with a compatible scan tool.
  • Check battery voltage and charging system; confirm stable 12V during key-on and cranking.
  • Inspect ECU/PCM connectors and wiring for corrosion, bent pins, water intrusion, or damage.
  • Verify CAN and related communications for errors or multiple modules reporting faults.
  • Check vehicle history for recent software updates, reflashes, or aftermarket tuning.
  • Attempt to clear codes, cycle key/engine and see if code returns; note conditions when it reappears.

Signal parameters

  • Battery voltage (key ON, engine OFF and during start) — stable 12–14.5 V expected
  • CAN bus error counts and node communication status
  • Throttle position / ETV angle (reported vs expected)
  • Cruise control status and availability flags
  • ECU internal checksum or ROM integrity flag (if available via OEM tool)
  • Related sensor voltages (accelerator pedal position sensors) to rule out external causes

Diagnostic algorithm

  1. Connect a capable scan tool and record all DTCs and freeze-frame; note time and conditions.
  2. Verify battery and charging system health; recharge or replace battery if voltage unstable.
  3. Inspect ECU and harness connectors for moisture, corrosion, or physical damage; repair as needed.
  4. Check CAN/communication lines for continuity and errors; repair wiring or connectors if intermittent.
  5. Confirm whether vehicle has aftermarket tuning or a recent reflash; if present, restore OEM calibration.
  6. Using the manufacturer-approved diagnostic tool, attempt to read ROM/checksum and reflash or update ECU software per service bulletin/tech data.
  7. If reprogramming fails or ROM integrity cannot be restored, follow manufacturer procedure for ECU replacement and programming.
  8. After repairs or reflash, clear codes and perform road test and re-scan to confirm the fault does not return.
  9. If code persists after above steps, escalate to manufacturer technical support or consult service bulletins for known issues.

Likely causes

  • ECU ROM/firmware corruption or checksum error
  • Poor battery voltage or recent jump-start/programming interrupted
  • Faulty ECU connector or water-damaged ECU
  • Incorrect or incomplete software update / non-OEM tune
  • Intermittent CAN/bus communication fault preventing proper monitoring

Fault status

⚠️ Status
ECU ROM monitoring has detected an abnormality related to ETV/Cruise Control. Possible ROM/firmware corruption, ECU memory fault, or interrupted/incorrect programming. Verify power, connections and ECU software integrity.
🔴 Repair difficulty: Hard
⏱️ Diagnostic time: 1.5-4.0 hours

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406

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