Flow chart
Single arrow: wire connection
Triple arrow: multiplexed connection
| element | designation |
|---|---|
| BSI1 | built-in systems interface |
| C001 | diagnostic socket |
| 0004 | instrument panel |
| 1261 | accelerator pedal position sensor |
| 1262 | motorised throttle housing |
| 1312 | inlet air pressure and temperature sensor |
| 1320 | injection ECU |
| no. of link | signal | transmitter / receiver | nature of signal |
|---|---|---|---|
| 1 | throttle position information | 1262/1320 | analogue |
| 2 | motorised throttle control | 1320/1262 | (PWM) |
| 3 | fuel level information | BSI1/0004 | multiplexed signal (CAN CONFORT / VAN CONFORT) |
| warning lamp information | |||
| 4 | request for lighting of the warning lights on the instrument panel | 1320/BSI1 | multiplexed signal (CAN) |
| cruise control status information | |||
| cruise control fault | |||
| speed limiter status information | |||
| speed limiter fault | |||
| engine running status | |||
| 5 | fuel gauge information | BSI1/1320 | multiplexed signal (CAN) |
| speed limiter reference speed value | |||
| speed limiter activation request | |||
| cruise control reference speed value | |||
| 6 | dialogue between the BSI 1 and the diagnostic tool | BSI1/C000 | multiplexed signal (CAN DIAG) |
| 7 | dialogue between the injection ECU and the diagnostic tool | 1320/C000 | line K |
| 8 | inlet air pressure and temperature information | 1312/1320 | analogue |
| 9 | accelerator pedal position information | 1261/1320 | analogue |
Motorised throttle housing (1262)
(10) motorised throttle housing
Role
Dose the quantity of air admitted in the cylinders
The request to open the air regulating flap is no longer a direct command by cable linked to the accelerator pedal
An accelerator pedal sensor informs the injection ECU of the driver's request
The injection ECU then controls the motorised throttle housing motor
A potentiometer incorporated in the motorised throttle housing enables the injection ECU to determine the exact position of the air butterfly
Description
A throttle position at rest (ignition off) or "limp home" position in the event of failure
B position of the gas butterfly with the ignition on or at idle
C position of the butterfly at full load
"a" force of the butterfly motor
"b" force of the spring
With the ignition off, the "limp home" spring holds the butterfly open (see A)
When the ignition is switched on, the injection ECU controls the throttle to the idle position countering the force of the return spring (in the case of a down-grade operating mode, placing in the "limp home" position) (see B)
When the engine is at idle, the motorised throttle housing throttle moves to supply the flow of air required by the engine (replaces the idle regulation stepper motor)
From 1500 rpm, the injection ECU controls the throttle in the other direction to assist the return spring (in the case of a down-grade operating mode, placing in the "limp home" position) (see C)
The position of the throttle is monitored by the injection ECU (potentiometer incorporated in the motorised throttle housing)
The injection ECU cuts off the supply to the throttle housing if certain faults are present
WarningDo not attempt to adjust or dismantle a motorised throttle housing (safety)
Electrical special features
Control: injection ECU
Variable voltage control (OCR)
- Opening of the throttle: positive OCR voltage
- Closing of the throttle: negative OCR voltage
NoteOCR: opening cyclic ratio
The throttle housing is closed by a return spring (in the case of a down-grade operating mode, placing in the "limp home" position)
If the throttle becomes clogged, the injection ECU supplies the motorised throttle housing motor with a negative voltage (displaying of the parameter measurements on the diagnostic equipment)
Allocation of channels of connector
- Terminal 1: supply 5 V
- Terminal 2: throttle position signal 1
- Terminal 3: (+) engine
- Terminal 4: (-) engine
- Terminal 5: earth (potentiometer)
- Terminal 6: throttle position signal 2
Throttle open - fully open
- Voltage between earth and track 2: 4,45 to 4,95 Volts
- Voltage between earth and track 6: 0,05 to 0,55 Volts
Throttle closed - closed position
- Voltage between earth and track 2: 0,3 to 0,7 Volts
- Voltage between earth and track 6: 4,3 to 4,7 Volts
Position of the throttle in down-grade mode
- Voltage between earth and track 2: 0,66 to 1,23 Volts
- Voltage between earth and track 6: 3,7 to 4,4 Volts
Inlet manifold pressure sensor with integrated temperature sensor (1312)
The inlet manifold pressure sensor and the air temperature sensor are incorporated in a single part
Role
The sensor makes it possible to determine the air pressure in the inlet manifold and the temperature of the inlet air
The inlet manifold pressure measurement enables the ECU to define the weight of air entering the engine in order to dose the quantity of petrol
The air temperature sensor informs the ECU of the temperature of the air admitted
The role of the injection ECU in terms of the information received
- Calculate the density of the ambient air
- Determine the quantity of fuel to be injected
NoteThe density of the air decreases according to the altitude
Description
"c": air entry
Electrical special features
Allocation of channels of connector
- Terminal 1: signal (inlet manifold pressure sensor)
- Terminal 2: 5 V
- Terminal 3: signal - air temperature sensor
- Terminal 4: earth
Electrical features: inlet manifold pressure sensor (measurement between track 1 and track 4)
Electrical features: air temperature sensor (measurement between track 3 and track 4)
- Resistance at 20 degrees Celsius: 2500 ohms
- Resistance at 80 degrees Celsius: 300 ohms