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Problem with idle control:firmware 1.1.12
- 4-wire stepper motor, Magneti Marelli
- 2-coils, A-D and B-C
- stepper motor responds to mdi command, mdiCC results in nice 1000 RPM idle
- iac_step_sec seams correct, because the iac closes with increased throttle, so its turning in the right direction.
- there are no leaks in the air supply
Symptom. When the ignition is turned on, the stepper will go to its start position, but when the engine is started it will go to a midway position and controls the idle speed from there on. This results in an engine idle speed of approx. 2300 RPM.
Q why is the engine idle speed stuck on 2300 RPM?
Relevant config
iac_step_seq=2D
iac_conf=5E
iac_max_steps=E8
iac_tps_thres=05
iac_cold_idle_temp=A0
iac_warm_idle_temp=CF
iac_cold_rpm=72
iac_warm_rpm=4F
iac_cold_start_pos=EE
iac_warm_start_pos=6F
iac_afterstart_rpm=00
iac_afterstart_duration=1E
iac_speed=07
iac_kp=21
iac_ki=0B
iac_kd=2C
launch_rpm=28
iac_integral_limit_dec=18
iac_integral_limit_inc=37
iac_integral_deadband=0A
iac_deadband=05
als_cut_maxtps=00
iac_overclose_interval=FF
iac_ref_pos[0]=6B
iac_ref_pos[1]=66
iac_ref_pos[2]=61
iac_ref_pos[3]=5E
iac_ref_pos[4]=53
iac_ref_pos[5]=50
iac_ref_pos[6]=47
iac_ref_pos[7]=40
iac_ref_pos[8]=3E
iac_ref_pos[9]=26
iac_sol_channel=FF
iac_ign_slope=10
softrpm_range=03
iac_ign_advance_limit=10
iac_ign_retard_limit=18
iac_ign_threshold=08