Code
P1689
MINI
P — Powertrain
Electronic throttle control monitor level 2/3 - torque calculation error
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UK: 1
EN: 4
RU: 4
AI status
Completed
Completed
100%
Causes
- Faulty or contaminated electronic throttle body (sticking plate or motor issue)
- Incorrect or out-of-range throttle position sensor or accelerator pedal sensor readings
- Damaged wiring, poor connector contact or grounding problems in ETC circuit
- Low battery voltage or charging system faults affecting ETC measurement
- ECU software or calibration error requiring adaptation or reflash
- CAN-bus/communication errors between modules
Symptoms
- Check Engine Light (MIL) illuminated
- Reduced engine power or limp-home mode
- Poor or delayed throttle response, hesitation or surging
- Inability to maintain steady idle or rough idle
- Intermittent loss of drive or sudden power reductions
- Related throttle/pedal correlation codes may be present
What to check
- Read stored DTCs and freeze-frame data; note conditions when fault set
- Scan live data: accelerator pedal positions (A/B), throttle valve angle, requested torque, motor current, and any calculated torque values
- Inspect wiring and connectors at throttle body and ECU for corrosion, damage or loose pins
- Check battery voltage and charging system under load
- Visually inspect throttle body for carbon buildup or physical obstruction
- Verify CAN-bus communications and check for related module faults
Signal parameters
- Accelerator pedal position (A/B): should track together across full travel (0–100% range)
- Throttle valve (butterfly) angle/position: moves smoothly and correlates with pedal input (0–100% range)
- Requested torque / torque request signal: should change when pedal input changes
- Measured/ calculated torque or motor current: changes with load and throttle position and remains within manufacturer limits
- Battery voltage: nominal 12–14.8 V during operation (watch for drops during events)
- CAN/communication status: no lost frames or timeouts reported
Diagnostic algorithm
- Retrieve freeze-frame and full DTC list. Note operating conditions (battery voltage, engine load, temperature) when code set.
- Perform visual inspection of throttle body, wiring harness, and connectors. Repair any obvious damage or corrosion.
- Verify battery/charging system health and voltage stability under load. Repair charging/battery faults before further ETC testing.
- With a capable scan tool, monitor live data: accelerator pedal A/B values, throttle valve position, requested torque, motor current or torque calculation. Confirm signals are plausible and correlate with pedal input.
- Check pedal sensor plausibility: A and B sensors should track closely; if they don't, inspect/replace pedal sensor assembly.
- Inspect and, if required by service manual, remove and clean throttle body. Check for smooth mechanical movement and absence of binding. Replace if motor or internal gear shows excessive play or wear.
- Perform wiring checks: continuity and resistance between throttle body and ECU, and verify grounds. Wiggle test harness while monitoring live data for intermittent faults.
- Attempt throttle adaptation/learn procedure using dealer or factory-level scan tool per manufacturer instructions, then clear codes and test drive.
- If fault persists, isolate component by substitution only after verifying wiring and adapt procedures — consider replacing throttle body or ECU per troubleshooting flowchart.
- After repairs, clear codes and verify repairs with extended test drive under the same conditions that set the code.
Likely causes
- Throttle body motor current/torque sensor reading inconsistent with throttle plate position
- Accelerator pedal position sensor mismatch (A/B sensors not matching)
- Corroded/loose connector at the throttle body or ECU
- Throttle plate binding from carbon deposits or foreign object
- Battery/alternator voltage drop during operation causing measurement errors
Fault status
Status
Electronic throttle control monitor level 2/3 — torque calculation error
Repair difficulty: Medium
Diagnostic time: 1.5-3 hours
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