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Home / DTC / P1121 — ETV motor relay

P1121 — ETV motor relay

Detailed page for trouble code P1121.

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22,491specific
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Code

P1121

MITSUBISHI P — Powertrain

ETV motor relay

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

Causes

  • Blown fuse for ETV motor/relay circuit
  • Faulty ETV motor relay (stuck, open coil, or bad contacts)
  • Open, short, or high-resistance wiring between relay, motor and ECU
  • Corroded or loose connector pins at relay, motor, or ECU
  • Faulty ETV motor (internal short, stall, or excessive draw)
  • Poor or missing ground at relay or motor

Symptoms

  • Check Engine MIL illuminated with P1121 stored
  • Reduced or erratic throttle/valve response, possible limp mode
  • No audible relay click when system commands ETV motor
  • ETV-related drivability complaints (poor idle, hesitation)
  • Intermittent operation that may work after tapping relay or connector

What to check

  • Read freeze frame and live data; confirm P1121 and any related codes
  • Visually inspect relay, fuse, relay socket, and wiring harness for damage or corrosion
  • Check fuse continuity and proper fuse rating for the ETV circuit
  • Listen for relay clicking during key-on and when commanding ETV motor with a scan tool
  • Measure battery voltage at relay power terminal with key ON
  • Measure control/coil side voltage or ground at relay socket when ETV is commanded

Signal parameters

  • Relay supply voltage: approx. battery voltage (~11–14 V) at relay power terminal with key ON
  • Relay coil activation: coil should see battery voltage or ECU-switched ground when commanded (voltage change when activated)
  • Typical relay coil resistance (generic 12 V relay): roughly 50–150 ohms (manufacturer-specific values may differ)
  • Output to ETV motor: near battery voltage (~11–14 V) when relay is energized
  • Ground continuity: low resistance (< 2 ohms) from relay/motor ground to chassis ground
  • Motor current draw: should be within manufacturer spec; excessive current indicates motor stall or short

Diagnostic algorithm

  1. Retrieve and record all stored DTCs and freeze-frame data. Note related codes that could affect ETV circuitry.
  2. Visually inspect relay, fuse, relay socket, wiring harness, and connectors for corrosion, damage, or loose pins. Repair any obvious issues.
  3. Verify fuse for ETV circuit has continuity and correct rating. Replace if blown and test whether code returns.
  4. With key ON (engine OFF), measure battery voltage at relay power terminal. Confirm voltage present at relay input.
  5. Command the ETV function with a scan tool (if available) and observe whether relay clicks. While commanding, measure voltage at coil/control terminal to confirm ECU is providing expected drive (voltage change or ground switch).
  6. If relay does not activate, swap relay with an identical, known-good relay or bench-test the suspect relay. Replace relay if it fails bench test.
  7. With relay energized, measure voltage at relay output and at the ETV motor connector. If output is present but motor does not run, check motor continuity and resistance; bench-test motor if accessible.
  8. Check wiring continuity between relay output and motor, and between motor ground and chassis. Repair any opens/shorts/high resistance circuits.
  9. If wiring, relay, fuse, and motor test OK but relay control is not driven correctly by ECU, inspect ECU connector and wiring to the ECU. Consider ECU driver fault and consult manufacturer service information before replacing ECU.
  10. After repairs, clear codes, perform function tests and road test to ensure the fault does not return.

Likely causes

  • Failed or intermittent relay
  • Blown fuse or poor fuse connection
  • Damaged connector or wiring between relay and ETV motor
  • Relay socket corrosion or loose terminal
  • ETV motor drawing excessive current (mechanical jam)

Fault status

⚠️ Status
ETV motor relay circuit malfunction — relay did not operate or circuit out of range
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P1120 P1122 P2106 P2110 P2135 P0690
406

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