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S80 '98-'06 / S60 '00-'09 / V70 & XC70 '00-'07 General Forum for the P2-platform S60 / V70 / XC70 / S80 models |
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v70 2.4 T5 Fuel pressure 2004Views : 551 Replies : 7Users Viewing This Thread : |
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Nov 29th, 2020, 18:16 | #1 |
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v70 2.4 T5 Fuel pressure 2004
have a 2004 T5 2.4 that has recently developed a fuel pressue issue. On start up using a pressure guage it runs at 43 psi and then after approx 5 minutes the pressure starts to drop and a couple of minutes later the car stalls. Turning the ignition off and back on the pressure goes back to 43 psi and starts instantly. Have replaced the pcm, fuel pressure sensor, fuel filter and pump. So can anyone tell me what the voltages should be at the pressure sensor - 4 wires please!!!
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Nov 29th, 2020, 21:53 | #2 | |
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should be 1.8v to 2 v at the operating pressure of 350 - 400 kpa ( absolute pressure ) on pin A2 of the ECM there is a pin A 3 which is fuel temperature
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Nov 30th, 2020, 01:41 | #3 |
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A 2004 ? Read about CEM corrosion, may look from under the dash with a flash light for dry or wet traces of water
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Nov 30th, 2020, 19:10 | #4 |
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amazing - thank you so my issue is as the fuel pressure starts falling the voltage drops - i can't work out if it the voltage dropping off or the pressure dropping causing the voltage to drop - that makes sense in my my head!!!
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Nov 30th, 2020, 19:12 | #5 |
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Nov 30th, 2020, 23:04 | #6 | |
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No there is nothing in the CEM which affects the Engine calibration , that's all in the ECU .
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Dec 1st, 2020, 07:53 | #7 |
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yes, as the pressure drops the voltage drops slowly until the engine dies and then shows 0.8v turn ignition off and recycle twice and the voltage goes back to 2.4v and pressure goes straight back to 43 psi so Im thinking i might have bought a faulty pressure sensor or i have a wiring fault. Have tried two different PEMS off running cars
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Dec 1st, 2020, 11:52 | #8 | |
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