ZEST BOLT Service Manual

ENGINE 1.3L QUADRAJET (90PS) 109 OPERATION The accelerator pedal position is converted into an electrical voltage signal and sent to the injection control unit by the potentiometer connected to the pedal. The accelerator pedal position signal is processed together with the information relating to the engine rpm to obtain the injection times and the pressure PIN OUT Pin Description Signal type 1 Track 2 supply 5 V input 2 Track 1 supply 5 V input 3 Track 1 earth Earth 4 Track 1 signal Analogue output 5 Track 2 earth Earth 6 Track 2 signal Analogue output BOSCH SENSOR TECHNICAL SPECIFICATIONS Supply voltage: 5 V +/- 0.3 V Resistance at potentiometer cursor terminals: 1 Kohm +/- 0.4 kOhm Track 1 resistance: 1.2 Kohm +/- 0.4 kOhm Track 2 resistance: 1.7 Kohm +/-0.8 kOhm HELLA SENSOR TECHNICAL SPECIFICATIONS Supply voltage: 5 V +/- 0.3 V Resistance at potentiometer cursor terminals: 1 kOhm +/- 0.4 kOhm Track 1 resistance: 0.9 kOhm +/- 35%....1.4 kOhm +/- 35% Track 2 resistance: 1.2 kOhm +/- 35%....2.0 kOhm +/- 35%. H. AIR FLOWMETERWITH BUILT INAIR SENSOR SPECIFICATIONS The debimeter is located on the air intake sleeve and is hot film type. The intake air temperature sensor is built into the air flow meter on the same support as the sensitive element. G. ACCELERATOR PEDAL POTENTIOMETER CONSTRUCTION SPECIFICATIONS The sensor is secured to the accelerator pedal; inside it contains an axially-located shaft connected to two potetiometers : a main one and one safety one. A coil spring on the shaft ensures the correct amount of resistance to pressure while a second spring ensures return following release. The redundant signal reading makes it possible to continuously monitor the plausibility of the readings in order to guarantee complete safety whilst driving even if there is a failure.