The major issue is that the throttle plate does not move. It does not even appear to get a signal to move, but it does however on a Citroën ECU, a bit of information below that I've gone through.
I have had it wired in two ways, one produces one throttle programming fault, P1153, while having it wired according to the diagrams, P0121, P1157, P0122 coherence faults and an additional P3014, throttle stop programming fault appear.
- With the first setup of wiring, Diagbox correctly recognizes the throttle position and voltage when moved by hand and recognizes the pedal position (throttle butterfly condition, when running), but seems unable to control the motor as the actuator test does briefly move the valve a fraction, not fully, but reports no fault. This has only P1153. The Engine remains unable to rev above 2000 and will stall if not kept up with the accelerator. Moving the valve by hand when running, will get it idling fine.
- Wired to the diagrams, diagbox shows the throttle as open at 91° and 5v on throttle voltage with no changes when moved by hand.
I've measured the voltages at the throttle, its 3.4v in and out on the motor positive and ground.
Pressing the accelerator pedal, no voltage changes to the throttle.
Performing an actuator test on the throttle, it flicks it briefly open, the voltage drops to 0v on both + and - when this occurs, before back to 3.4v.
ECU has been tested, same situation with an IMMO-off one, before I zapped it.
A Citroën ecu that was meant for another car, operates the plate with ignition on and pressing the accelerator pedal. Unfortunately it's not useable.
Do the voltages read wrong at all, or any ideas at all.
Would anyone know a source where I can actually get voltages certain things use, positives etc?