What does code P1143 mean?

Q: What does code P1143 mean?

Air Assisted Injector Control Valve Range Performance. P1143 on a Jaguar indicates that the engine control module (ECM) has detected an out-of-range performance from the air-assisted injector control valve circuit, typically on the secondary air injection system. The ECM monitors the valve's electrical response and expects a certain current or voltage feedback when commanded; when the signal falls outside the programmed range, this code is stored.

DTC codes / Jaguar codes / P1143

P1143 · JaguarAir Assisted Injector Control Valve Range Performance

P1143 on a Jaguar indicates that the engine control module (ECM) has detected an out-of-range performance from the air-assisted injector control valve circuit, typically on the secondary air injection system. The ECM monitors the valve's electrical response and expects a certain current or voltage feedback when commanded; when the signal falls outside the programmed range, this code is stored.

SystemPowertrain

Code typeJaguar specific

SeverityMedium

Fix difficultyIntermediate

AreaFuel and air metering

Guidance is general and written for Jaguar vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.