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Home / DTC / P2102 — ETV motor circuit(shorted low)

P2102 — ETV motor circuit(shorted low)

Detailed page for trouble code P2102.

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Code

P2102

MITSUBISHI P — Powertrain

ETV motor circuit(shorted low)

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

Causes

  • Short to ground in the ETV motor power/driver wiring
  • Damaged or corroded ETV motor connector or pins
  • Failed ETV motor (internal shorted winding)
  • Faulty engine control module (ECM) driver circuit
  • Blown or shorted fuse or damaged relay in throttle/ETV supply
  • Water intrusion or physical damage to harness near throttle body

Symptoms

  • Check Engine Light (MIL) illuminated
  • Reduced engine power or vehicle in limp/limitation mode
  • Poor or unresponsive throttle acceleration
  • Erratic or high/low idle
  • Possible stalling or inability to maintain speed
  • Stored related throttle actuator codes

What to check

  • Read and record freeze frame and all stored codes with a scan tool
  • Visual inspection of throttle body, ETV motor connector, wiring, and chassis grounds
  • Check fuses and relays for throttle/ETV circuit
  • Backprobe harness side of ETV connector and measure voltage with ignition ON and during commanded throttle movement
  • Measure resistance between ETV motor windings and ground (check for near-zero short)
  • Wiggle test wiring while monitoring live data and voltages to reproduce fault

Signal parameters

  • With ignition ON and ECU not driving: harness supply/reference should not be pulled to ground (voltage depends on design; verify with service manual)
  • When commanded, the ECU typically supplies a PWM or driven voltage to motor — expected to vary between ~0–12 V (consult model-specific manual)
  • ETV motor winding resistance: should show finite low-ohm continuity between motor terminals but NOT a direct short to vehicle ground (near 0 Ω indicates shorted winding)
  • If circuit is 'shorted low' you will see near 0 V at the motor driver output when ECU commands movement

Diagnostic algorithm

  1. Connect a scanner, record codes and freeze frame, then clear codes and attempt to reproduce.
  2. Perform a careful visual inspection of wiring and connectors at the throttle body for damage, corrosion, pin push-out, or water intrusion.
  3. With connector disconnected, measure resistance between motor terminals and chassis ground. A direct short to ground (very low ohms) indicates internal motor or harness short.
  4. Backprobe the harness-side connector with ignition ON (engine off) and command throttle movement from a scan tool while observing voltage. If voltage remains near 0 V while commanded, suspect short to ground in harness or ECU driver failure.
  5. Check fuses/relays related to throttle/ETV supply. Replace any blown components and re-test.
  6. Perform wiggle/stress test on wiring from throttle body to ECU while monitoring live data to locate intermittent short.
  7. If harness and connectors are good, bench-test or replace the ETV motor. If replacement fixes code, repair is confirmed.
  8. If new motor also shows same condition, investigate ECU driver output. Consult service manual for ECU bench tests or consider ECU replacement/repair as last resort.
  9. After repairs, clear codes and road-test to verify that the P2102 does not return and throttle operation is normal.

Likely causes

  • Wiring harness chafed and shorting to chassis ground near throttle body
  • Corroded/loose connector at the ETV motor causing low/shorted voltage reading
  • ETV motor internal short (low resistance to ground)
  • ECM output transistor or driver shorted to ground

Fault status

⚠️ Status
ETV motor circuit shorted low — ECU detected abnormally low voltage/current on throttle motor drive circuit. May cause reduced power or limp mode; inspection of motor, wiring, connectors, fuses and ECU driver required.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

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