P1681

Code

ALFA ROMEO P — Powertrain

Motorised throttle spring fault

Brand: ALFA ROMEO

Type: P — Powertrain

Views: UK: 5 EN: 5 RU: 3

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Page language: EN

Broken or missing throttle return spring inside the throttle body assembly
Mechanical binding or seized throttle shaft (carbon, dirt, foreign object)
Damaged internal gear or spring housing in the throttle actuator
Incorrect installation after previous service (spring not fitted or installed improperly)
Electrical supply, ground, or connector fault causing improper actuator movement
Throttle body calibration/adaptation fault or control module software issue

MIL/Check Engine light illuminated
Reduced engine power / 'limp' mode engaged
High, low or unstable idle RPM
Delayed or no throttle response to pedal input
Stalling at idle or during low-speed maneuvers
Audible unusual noise from throttle body area when driving or during key-on self-test

Read stored freeze-frame data and pending codes with a capable scan tool
Perform an actuator/throttle body self-test from the scan tool and observe plate movement
Visual inspection of the throttle body for broken spring, damaged housing, carbon build-up or foreign objects
Inspect wiring harness and connector for corrosion, bent pins, damaged insulation or poor connections
Check battery voltage and ground integrity with key on / engine off and during cranking
Confirm throttle position sensor (TPS) and pedal position sensors provide consistent, correlated signals

Throttle motor supply voltage: approximately battery voltage (11–14.5 V) with key ON/engine RUN
Throttle plate commanded angle vs actual: commanded should be followed smoothly without abrupt stops
Throttle position sensor (TPS) idle angle: typically a small percent or few degrees (manufacturer-specific)
Motor current: should rise when moving the plate but not show excessive continuous high draw (indicates binding or broken spring)
No frequent rapid oscillation or dithering of commanded vs actual angle during steady-state

Retrieve and record all codes, freeze frame and live data. Note if multiple throttle-related codes are present.
Attempt to reproduce symptom and run a throttle actuator self-test using OEM-level scan tool while monitoring commanded vs actual throttle angle.
Visually inspect throttle body externally for damage, carbon build-up or foreign objects. Check connector and wiring for corrosion or breaks.
With ignition ON (engine off) measure supply voltage and ground at the throttle actuator connector; verify adequate voltage and solid ground.
Command the throttle open and closed from the scan tool while observing plate motion and monitoring motor current. Look for binding, delayed return, or sudden stops.
If mechanical binding or broken spring is suspected, remove the throttle body for detailed inspection. Inspect internal spring, gears, shaft, and housing for damage.
If internal spring or actuator hardware is damaged, replace the throttle body assembly or actuator per manufacturer procedure. Do not attempt risky in-situ repairs of internal spring unless following OEM guidance.
After repair or replacement, perform required throttle adaptation/relearn procedure with the scan tool and clear codes. Verify proper operation during test drive.
If electrical tests show normal and no mechanical fault is found, consider control module software update or further diagnostics by a dealer using OEM resources.

⚠️ Status

Motorised throttle spring fault — throttle return/spring mechanism not operating within expected parameters

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.5-3.0 hours

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P1681 — Motorised throttle spring fault