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Home / DTC / P1969 — Trustful check ignition timing

P1969 — Trustful check ignition timing

Detailed page for trouble code P1969.

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Code

P1969

MITSUBISHI P — Powertrain

Trustful check ignition timing

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

Causes

  • Failed crankshaft or camshaft position sensor
  • Wrong cam/crank correlation (timing belt/chain jumped or slipped)
  • Faulty ignition timing actuator (VVTi/MIVEC solenoid or phaser)
  • Poor power or ground to ECM or related sensors
  • Intermittent or corroded wiring/connectors between sensors and ECM
  • ECM software error or internal fault

Symptoms

  • Illuminated MIL (check engine light)
  • Engine misfire, rough idle, or hesitation on acceleration
  • Hard starting or no-start condition
  • Loss of power or reduced engine performance
  • Unusual engine noise if timing chain/belt has jumped
  • Intermittent stalling

What to check

  • Read and record freeze-frame and all stored codes with a scan tool
  • Check battery voltage and charging system under load
  • Visual inspection of crank and cam sensor connectors and wiring for damage or corrosion
  • Inspect timing belt/chain condition, tensioner, and alignment marks
  • Check VVT/MIVEC solenoid and actuator operation and oil supply
  • Monitor live crank and cam sensor signals and compare phase correlation

Signal parameters

  • Crankshaft position sensor: square wave or VR signal; frequency proportional to engine RPM; clean transitions at idle
  • Camshaft position sensor: phase signal synchronized with crank; specific pulse pattern per engine
  • Crank/Cam correlation: consistent angular offset at a given engine position (manufacturer-specific degrees)
  • VVT actuator command vs. actual response: commanded angle (degrees) and measured cam phase (if supported)
  • Battery voltage: stable >12.2 V at idle; >11 V during cranking
  • Ignition timing advance: within manufacturer spec during key operating conditions

Diagnostic algorithm

  1. Connect an OBD-II scanner capable of live data and read all stored/active codes and freeze-frame data.
  2. Verify battery/charging system voltage. Recharge or replace battery if weak.
  3. Visually inspect crank and cam sensor wiring and connectors. Repair any damaged wiring or poor connections.
  4. Capture live crank and cam sensor waveforms with a scope or appropriate scan-tool data. Confirm signals are clean and in correct phase relationship.
  5. Inspect timing belt/chain condition and alignment marks. If chain/belt has skipped teeth or tensioner failed, repair and retime engine before clearing codes.
  6. Check VVT/MIVEC solenoid operation and oil supply; remove and bench-test solenoid if necessary. Replace if inoperative or oil contaminated.
  7. If sensor signals are intermittent, substitute known-good sensors or connectors to confirm.
  8. After repairs, clear codes and perform a road test while monitoring crank/cam correlation and timing parameters. Confirm code does not return.
  9. If intermittent or no cause found, check ECM power/ground and consider reflashing or replacement per manufacturer guidance.

Likely causes

  • Crankshaft position sensor degraded or intermittent
  • Camshaft position sensor signal missing or distorted
  • Timing belt/chain has skipped teeth or tensioner failed
  • Variable valve timing (VVT/MIVEC) actuator stuck or leaking oil pressure
  • Damaged sensor harness or poor connector pin contact
  • ECU needs reflash/update or replacement

Fault status

⚠️ Status
ECM detected failed/invalid ignition timing verification (trust check). Timing correlation or timing control component inconsistent with expected values.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5 - 4 hours

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406

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