Gutted - Next thing then is to check the singals and look for continuity between the sensor and the ECM. For this you will need a digital multi meter or similar approved device commonly reffered to as a "Volt" meter.
Test '1'
Checking the sensor multiplug/outputs
The sensors multiplug itself *should* have 3 wires coming from pins 'A-C'
(look at the business end of the plug carefully and you'll see them labelled); 'A' - "Biege", 'B' - "Violet" & 'C' - "Brown".
Meter mode: "DC20" - Ignition "ON" and multiplug disconnected from the sensor. Probe pin 'C' and an earth - You should see around +5v
(If so, great. If not, there's your problem... lack of supply voltage - check wiring loom for breaks)
Meter mode: "Ohms 2k" - Ignition "OFF" and multiplug disconnected from the sensor. Probe pin 'A' and earth - You should see around 0.00 to 0.02 Ohms
If so, great. If not check wiring for breaks or, with a high reading check condition of earths)
Meter mode: "DC20" - Engine "Idling" and multiplug connected to the sensor. Probe pins 'A' and 'B' - You should see +4.3v
(If not, faulty sensor)
Meter mode: "DC20" - Engine "3000 rpm" and multiplug connected to the sensor. Probe pins 'A' and 'B' - You should see +4.1v
(If not, faulty sensor)
Test '2'
Checking the wiring infastructure
Again, the sensor multiplug itself *should* have 3 wires coming from pins 'A-C'. These three wires all go to the ECM plug 'B' which is the 48 pin brown multiplug plug on the left as you're looking down on the ECM... if its black I've got it the wrong way round and you still need the brown plug.
The three wires from the MAP Sensor *should* "map" back to plug 'B' at the ECM as below:
- 'MAP Pin' - "Wire Colour" - 'ECM Pin'
- 'A' - "Biege" - 'F2'
- 'B' - "Violet" - 'F3'
- 'C' - "Brown" - 'B2'
You'll need a DMM to trace these connections but set it to "Diode Test" and then probe from one multiplug to the other... this will enable you to do two things. The first is to check for continuity in the wire route itself
(Ensure it's going "point to point") and secondly, to see if either of these wires has a short to earth
(Meaning its touching something metal and is now continuous with the battery negative terminal).
Now go... play and report back
Mick