P1161 — Motorised throttle position coherence

Diagnostic algorithm

1. Retrieve all stored codes and freeze-frame; note oper. conditions when P1161 set. Clear codes and attempt to re-create. 2) Verify battery voltage >12.4 V with engine off and charging system healthy with engine running (>13.5 V). Low voltage can cause false faults. 3) Inspect throttle body electrical connector and wiring for damage, corrosion or loose pins; repair any issues. 4) With a scan tool view live data: command a change in pedal position and observe accelerator pedal sensors and throttle plate (actual) response. Check both TPS channels for agreement and for smooth response. 5) Measure TPS and pedal sensor voltages with meter/oscilloscope; check for stable signals and correct ranges. 6) Wiggle test wiring while monitoring live data for intermittent faults. 7) Inspect and, if necessary, clean throttle plate and bores to remove carbon deposits that can cause binding. 8) Perform throttle body adaptation/calibration using factory scan tool after cleaning or replacement. 9) If throttle motor does not move or draws excessive current, test motor supply/ground; replace throttle body if internal motor/actuator or gearbox faulty. 10) If wiring and throttle body check good, consider ECU diagnosis/possible reflash or replacement as last resort. Re-test road/drive cycle and clear codes.