Yksi laatikoihin perehtynyt kaveri ehdotti ilmamassamittarin vaihtoa, koska vikaantunut anturi voi sekoittaa ohjausyksikön toiminnan.
Kuormituksen laskentaan käytetään paljon muutakin informaatiota, kuin pelkästään ilmamäärää. Ilmamäärä-anturin vikaantuminen ei myöskään kytke vikatilaa (S ja W valot yynä pakkokolmonen).
Citroen technical training-PRESENTATION OF THE AL4 AUTOMATIC TRANSMISSION'
AUTO-DIAGNOSTIC
I - FAULT WARNINGS
The appearance of certain faults in the system causes the SPORT and SNOW warning lights to flash.
The sport and snow warning lights flash in the following cases:
• when the transmission oil is too hot (extinguish when oil has cooled),
• when the transmission oil is old (oil counter value at calibrated maximum value),
• when there is a break in the serial link between the transmission ECU and the control panel.
The "SPORT" and "SNOW" warning lights flash if there is a fault on the following components or information:
• transmission ECU,
• ECU supply,
• oil pressure sensor,
• supply to sequence electrovalves (EVS1 to EV6),
• regulation fault in main hydraulic pressure,
• multifunction switch,
• sequence electrovalves (EVS1 to EV6),
• main pressure modulating electrovalve (pressure EVM),
• converter lock-up modulating electrovalve (lock-up EVM),
• oil flow electrovalve in heat exchanger,
• main hydraulic pressure electrovalve,
• accelerator pedal not programmed,
• input speed and output speed,
• input speed and engine speed,
• output speed and engine speed,
• engine speed information,
• pedal position,
• supply to analogue sensors.