Code
P2101
MITSUBISHI
P — Powertrain
ETV motor magneto
Views:
UK: 10
EN: 17
RU: 21
AI status
Completed
Completed
100%
Causes
- Open or short in ETV motor coil circuit
- Corroded, loose or damaged connector at throttle body
- Blown fuse or faulty relay supplying the ETV motor
- Failed ETV motor (internal magnet/coil or commutation fault)
- Mechanical binding or foreign material in the throttle body
- Poor ground or low battery/voltage supply
Symptoms
- Check Engine Light (MIL) illuminated
- Reduced engine power / limp-home mode
- Unresponsive or delayed throttle response
- Surging or unstable idle
- Possible inability to accelerate or maintain speed
What to check
- Read freeze-frame and stored DTCs with a capable scan tool; record throttle-related live data (throttle position, commanded motor duty, motor current)
- Visual inspection of throttle body connector and wiring for corrosion, damage, pin push-out, or water ingress
- Check fuses and relays related to throttle/ETV circuit
- Measure battery voltage at key-on and with engine running to verify supply
- Backprobe ETV motor power and ground pins while commanding the actuator with a scan tool; observe voltage and PWM duty
- Measure motor coil resistance with connector disconnected (compare to specification)
Signal parameters
- Supply voltage at ETV motor power pin: approx. battery voltage (~12 V) with key ON/running
- ETV motor control: PWM signal from PCM — duty cycle varies with command (typical frequency ~100–300 Hz; varies by model)
- Motor coil resistance: low-ohm range (typically under 5 Ω) — consult factory spec for exact value
- Motor current: can be several amps under load (monitor with appropriate current probe)
- Throttle position sensor outputs: ~0.5–4.5 V depending on pedal/throttle angle (used for correlation checks)
Diagnostic algorithm
- Connect a scan tool, read and record all stored codes and freeze-frame data; note any related throttle codes.
- With ignition ON, visually inspect throttle body connector and wiring for damage, corrosion, loosened pins, or water intrusion.
- Check related fuses/relays and verify good battery voltage at fuse/junction supplying the ETV motor.
- Backprobe the motor power and ground at the throttle body connector. With key ON and engine OFF, verify battery voltage on power pin and good ground on ground pin.
- Use the scan tool to command the ETV actuator while observing motor power, PWM duty, and motor current. Confirm the PCM is commanding and the motor responds; note abnormal voltage or no response.
- With connector disconnected, measure coil resistance across motor terminals and compare to factory spec. Look for open, short to ground, or short to power.
- Perform wiggle tests on the harness while commanding the motor to check for intermittent faults.
- Inspect throttle plate and bore for mechanical binding or heavy carbon buildup; clean if necessary and recheck operation.
- If electrical checks point to a failed motor (open/short or no motion despite correct drive signals), replace the throttle body or motor per factory procedure.
- After repair, clear codes, perform relearn or idle/ETC adaptation procedures required by manufacturer, and verify proper operation with test drive.
Likely causes
- Damaged wiring/harness to the throttle body
- Failed ETV motor winding or magneto assembly
- Corroded connector or poor pin contact at the throttle body
- Blown fuse or weak/dirty ground
Fault status
Status
ETV motor magneto fault — throttle actuator motor or its circuit is malfunctioning. Check motor, wiring, connectors, power/ground and PCM.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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