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Home / DTC / P1961 — Trustful check TPS(main)

P1961 — Trustful check TPS(main)

Detailed page for trouble code P1961.

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Code

P1961

MITSUBISHI P — Powertrain

Trustful check TPS(main)

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

Causes

  • Faulty or degraded TPS (main)
  • Open, short or high resistance in TPS wiring or connector
  • Poor sensor reference voltage or ground (ECU side or chassis)
  • Corroded/loose connector pins or wiring harness damage
  • Throttle body contamination or mechanical binding affecting readings
  • Faulty ECU or intermittent ECU input circuitry

Symptoms

  • Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
  • Reduced engine power or limp-home mode
  • Poor idle, stalling, or surging at low throttle
  • Hesitation or poor throttle response
  • Inconsistent or jumpy throttle angle readings on scan tool

What to check

  • Read and record freeze-frame and live data (TPS voltage/percent, related codes)
  • Check for other related DTCs (APP sensors, throttle actuator, CAN communications)
  • Visual inspection of TPS connector and wiring for damage or corrosion
  • Backprobe TPS connector to measure reference (usually ~5V), signal and ground
  • Compare TPS main signal to secondary TPS or accelerator pedal sensor (if present)
  • Wiggle test wiring and connector while monitoring TPS signal for intermittent faults

Signal parameters

  • TPS signal voltage at closed throttle: typically ~0.2–1.0 V (varies by model)
  • TPS signal voltage at wide-open throttle: typically ~4.0–4.5 V
  • Signal should change smoothly with throttle movement (no sudden jumps or dropouts)
  • Reference supply typically ~5 V; ground should be near 0 V
  • Compare TPS percentage vs accelerator pedal percent — they should correlate logically

Diagnostic algorithm

  1. Retrieve all stored codes and freeze-frame data with a scan tool; note any related codes (P0120–P0130 range, P2135, P2106, etc.).
  2. Visually inspect TPS connector and wiring for corrosion, pin damage, chafing, or repairs. Repair any obvious damage.
  3. With ignition ON (engine off), backprobe the TPS: verify reference voltage (~5 V), signal voltage at rest, and ground continuity to chassis/ECU.
  4. Slowly operate the throttle (or have an assistant) while monitoring TPS signal on a scan tool or multimeter. Look for smooth, linear change without spikes or dropouts.
  5. If vehicle has a secondary TPS or accelerator pedal position sensor, compare signals for correlation and plausibility. Note any mismatch or implausible relationship.
  6. Perform wiggle tests on harness/connectors while observing signal for intermittent failures. Repair/replace as needed.
  7. If wiring and connector tests pass, follow manufacturer resistance/voltage tests for the TPS. Replace TPS if out of specification.
  8. Inspect and clean the throttle body if mechanical binding is suspected; verify free movement.
  9. After repair or replacement, clear codes and perform throttle relearn/calibration if required by service manual. Road-test and re-scan to confirm the fault is resolved.
  10. If the problem persists after replacing TPS and repairing wiring, suspect ECU input circuitry and consult dealer-level diagnostics or replace ECU as last resort.

Likely causes

  • TPS signal wire shorted to 5V, ground, or another signal
  • Intermittent connector contact (moisture/corrosion) on TPS
  • TPS internal degradation causing noisy or stuck voltage
  • Mismatch between TPS main and backup/accelerator pedal sensor signals
  • Throttle body sticking or dirty causing unexpected TPS movement

Fault status

⚠️ Status
Engine ECU detected implausible or unreliable main throttle position sensor signal. The ECU flagged P1961 and may reduce engine performance until the signal is restored to expected parameters.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1–3 hours

Similar codes

P0120 P0121 P0122 P0123 P2135 P2138
406

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