Technical Workshop manual mismatch on BOSCH sensor pinout?

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Technical Workshop manual mismatch on BOSCH sensor pinout?

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Jan 16, 2006
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I've been taking a look to this BOSC pressure sensor 0280101001:


altitude_sensor.jpg


Pin 1 = pressure output signal to ECU
Pin 2 = 5V power supply (from pin 30 from ECU)

Pin 3: on general schematics (chapter 10, pagee 14 of workshop manual) pin 3 is connected to +12V battery; in electrical schematics this pin is connected to GND.

Which would be the correct connection for pin 3?
Thanks.
 
According to the Fiat workshop manual, pin 1 of the atmospheric pressure sensor connects to pin 42 of the engine management ECU. Pin 2 of the APS connects to pin 30 of the ECU. Pin 3 of the APS connects to +30 which is a 12 volt +ve battery supply.
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Don't you think it's strange?

Sensor connections are:
- output (of course)
- +5V supply (of course)
- +12V (battery) supply instead GND???

Same BOSCH sensor mounted on other makes has connected pin to GND.

I'll post electric diagram (taken from workshop manual) where pin #3 is connected to GND.

In 16v-turbo engine, pressure sensor has these connections:
- output
- +5V
- GND

I should get about 5V at output at sea level, less on mountain.
I'll check this when I'll got a barometer.
 
I can't see anywhere that it's connected to GND.

Pin 1 (V = Green) of the APS connects to pin 42 of the ECU.

Pin 2 (G = Yellow) connects to the soldered joint (circled yellow) that also connects to various other sensors.

Pin 3 (N = Black) connects to the soldered joint (circled black). Another wire from that joint goes to pin 87 of relay 341. When the relay is switched by pin 36 of the ECU, pin 87 is connected to pin 30 which is connected to a +12v supply via the soldered joint circled red.

The soldered joints are insulated inside the wiring harness. They are not earth points.
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where did you get the workshop manual from for your Coupe? i really need this for mine
 
Buenos señores, soy nuevo en el foro. Tengo un problema con el Fiat coupé20vt y creo que puede ir por este sensor. Gasta mucha gasolina, expulsa humo blanco, e incluso llegó a romper el turbo por hacerlo girar a excesivas RPM (el turbo ya está reparado) pero el coche da muchos tirones incluso falsas explosiones. Es una falla típica del sensor de presión del colector de admisión, pero por lo visto este motor no lo trae. Sólo trae medidor de masa de aire, y sensor de presión atmosférica.
¿Algún caso similar por el foro?
 
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