P2103

Code

MITSUBISHI P — Powertrain

ETV motor circuit(shorted high)

Brand: MITSUBISHI

Type: P — Powertrain

Views: UK: 10 EN: 16 RU: 24

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Short to battery on ETV/ETC motor power circuit
Faulty ETV (electronic throttle/ETV) motor with internal short
Damaged wiring harness (chafing, pinched, melted insulation)
Corroded or loose connector or terminals
Failed ECM/drive transistor (less common)
Blown or incorrect fuse/relay related to throttle motor

Symptoms

Malfunction Indicator Lamp (MIL/DTC) illuminated
Reduced engine power or vehicle in limp/reduced-power mode
Poor or no throttle response, hesitation or stuck throttle position
Check engine light may remain on after start
Driveability problems such as inability to accelerate normally
In some cases vehicle may fail to start or engine may run poorly

What to check

Read and record freeze-frame data and all stored DTCs with a proper scan tool
Visually inspect ETV motor connector, wiring harness, and nearby components for damage, burns, melting, corrosion or water intrusion
Check fuses and relays for the throttle/ETV circuit
Backprobe motor connector and measure voltage at key pins with ignition on and while commanding motor (use appropriate scope or DVOM)
Measure resistance of ETV motor windings (compare to service spec) after disconnecting connector
Check for continuity to battery positive (short-to-B+) on the motor power lead and continuity to ground on ground leads

Signal parameters

ETV motor supply voltage (V) — should be close to battery when keyed on, but not present on control output unless commanded
ETV motor control output voltage or PWM duty (%) from ECM
ETV motor current (A) — high current may indicate shorted windings
Throttle plate angle / ETV position feedback (degrees) — commanded vs actual
DTC status and freeze-frame data (engine speed, voltage, load)

Diagnostic algorithm

Retrieve and record all codes and freeze-frame data. Clear codes and attempt to reproduce fault with a qualified scan tool.
Perform a careful visual inspection of the ETV motor, connector, and wiring harness for damage, corrosion, melted insulation or signs of overheating. Repair any obvious wiring damage.
Check fuses and relays for the throttle/ETV circuit; replace if blown or suspect. Verify correct fuse ratings.
With ignition off, disconnect the ETV motor connector. Measure motor winding resistance to ground and between motor terminals; compare to service specification. Very low resistance or short to battery/ground indicates motor or harness short.
With harness disconnected, check for short to battery on the motor power lead (should not be B+ when motor unplugged and key off). With key on, backprobe connector and measure voltage on power and control terminals while commanding motor using a scan tool. Look for unexpected battery voltage on control output (short-high).
If a short-to-B+ is present in the harness, isolate sections by disconnecting connectors and rechecking until the short location is found. Repair or replace damaged wiring/connector sections and protect routing.
If motor windings are shorted or bench test shows motor fault, replace the ETV motor assembly. Re-test after replacement.
If wiring and motor check good, test ECM output drive circuit per service manual. Replace ECM only after all other causes are eliminated and following OEM bench/diagnostic procedures.
After repairs, clear codes and perform road test / functional tests to confirm fault does not return.

Likely causes

Wiring damaged near harness routing (rub through to battery feed)
Connector corrosion at motor or ECU causing high-resistance/heat and short
ETV motor windings failed and shorted internally to supply
Aftermarket work or recent repairs disturbed harness routing/connectors
Faulty fuse/relay allowing an abnormal voltage spike

Fault status

⚠️ Status

ECM detected an over-voltage/short-to-battery condition on the ETV motor drive circuit (shorted high). Fault stored and MIL may be on; vehicle may enter limp/reduced-power mode until fault is resolved.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1-3 hours

Similar codes

Your experience will help others

+100 karma for a short comment :)

Was this AI description helpful?

Your feedback helps improve AI descriptions.

👍 Like 0 👎 Dislike 0

Send to email

P2103 — ETV motor circuit(shorted high)