Code
P1682
MINI
P — Powertrain
Electronic throttle control monitor level 2/3 - idle speed 'a' calculation fault
Views:
UK: 1
EN: 6
RU: 4
AI status
Completed
Completed
100%
Causes
- Dirty or sticking throttle body / throttle plate
- Faulty throttle position sensor (TPS) or throttle actuator
- Faulty accelerator pedal position sensor (APP)
- Wiring or connector faults between throttle body and ECU
- Low or unstable battery/charging voltage
- Intake air leaks or vacuum leaks downstream of MAF
Symptoms
- Malfunction Indicator Lamp (MIL) / Check Engine Light on
- Rough, unstable, high or low idle
- Erratic idle speed or throttle response
- Reduced engine performance or limp-home mode
- Possible hesitation on acceleration
What to check
- Read DTCs and freeze frame; note related codes and operating conditions
- Check battery voltage and charging system under load
- Inspect throttle body for carbon buildup and proper plate movement
- Scan live data: throttle angle, target idle, actual idle RPM, APP sensor signals, MAF/MAP readings
- Inspect wiring and connectors at throttle body, pedal module and ECU for corrosion, damage or poor contact
- Check for intake manifold / vacuum leaks (visual, smoke test or spray test)
Signal parameters
- Throttle angle (throttle plate position): typically 0–90° (idle usually 0–10° depending on engine)
- Idle speed (actual RPM): normally ~650–1000 rpm depending on engine and temperature
- Target idle (engine control setpoint): matches adaptive target for conditions
- APP/pedal position: 0–100% (at rest ~0%)
- Battery voltage: 11.5–14.8 V (engine running)
- MAF: grams/sec appropriate for engine size and rpm; MAP: kPa/load values within expected range
Diagnostic algorithm
- Retrieve DTC and related codes; record freeze-frame data and conditions when fault set.
- Verify battery voltage and charging system; repair charging/battery issues before further diagnostics.
- Visually inspect connectors and wiring to throttle body, pedal sensors and ECU; repair any damage/corrosion.
- Inspect and operate throttle body: check for carbon build-up, mechanical binding, and free movement. Clean throttle body if dirty.
- Using a scan tool, monitor live data: compare throttle angle, APP, target idle and actual RPM; check for inconsistent or implausible values.
- Check MAF/MAP and intake system for leaks or faulty readings (smoke test, vacuum gauge, or spray test).
- Perform component tests per manufacturer procedure: TPS/actuator resistance/voltage, pedal sensors, and throttle actuator functional test.
- If sensors/actuator pass and mechanical condition is good, perform throttle adaptation/idle learn procedure per MINI service instructions.
- If fault persists after cleaning, repairs and adaptation, consider replacing faulty throttle body assembly or relevant sensor(s).
- After repairs, clear codes and road test to confirm the fault does not return; re-check for related codes and adaptation status.
Likely causes
- Contaminated or mechanically sticking throttle body or plate
- Throttle position sensor or actuator fault
- Wiring/connectors to throttle body or pedal sensors
- Intake vacuum leak or MAF/MAP sensor fault
- Battery/charging system voltage outside specification
Fault status
Status
Electronic throttle control monitor level 2/3 — idle speed 'a' calculation fault (throttle/idle control discrepancy detected).
Repair difficulty: Medium
Diagnostic time: 1-3 hours
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