Hello,
I am new on this site.[:I]
Does someone know the exact output voltage on the map sensor when the car is idling?
Car is a XM v6 engine year 1998, engine ES9J4
Mine is giving now 1.4 volts at idle wich is I think a little bit too high.
(Sorry if my English is not so well, i am Belgian)
greetings.
someone knows the exact idle map voltage ?
Moderator: RichardW
Thanks Alexx,
yesterday I did teh measurement on my peugeot 206 1.1 (it has almost the same type sensor) an came to 1.485 v at idle (cold engine) and 0.8v when decceleration after pushing the throttle at stationairy.
the car runs quite good but i feels more like a 2.0 litre engine than a v6. What can be wrong else ?. The lambda sensor is already replaced by the dealer. By 2100 rpm it feels like the engine shudders above 4000 rpm it pulls like a rocket.
yesterday I did teh measurement on my peugeot 206 1.1 (it has almost the same type sensor) an came to 1.485 v at idle (cold engine) and 0.8v when decceleration after pushing the throttle at stationairy.
the car runs quite good but i feels more like a 2.0 litre engine than a v6. What can be wrong else ?. The lambda sensor is already replaced by the dealer. By 2100 rpm it feels like the engine shudders above 4000 rpm it pulls like a rocket.
Well, it's hard to tell. I also have a slight problem with my Xantia (1.8 16v), which didn't show up on the diagnostic device - when I push the throttle quickly, there's a short delay before the engine reacts, and then it reacts abruptly, on off/on fashion. This delay is short (about 1/4 of a second), but a bit disconcerting. I'm planning to check MAP sensor and throttle potentiometer manually, but didn't have a time yet.
About the lambda sensor, when you push the throttle quickly and/or fully, it's input is disregarded anyway, and ECU relies on main fuel and ignition map (manifold pressure vs. rpm).
It would be a good idea to test voltage on the MAP sensor with engine stationary and ignition off also - should be about 4.5 V or above. With engine idling, voltage should also reach near that value on brief throttle kick (on my case, diag. device was showing up to 980 mbar, which I suppose is normal, since there's almost no vacuum at that moment).
About the lambda sensor, when you push the throttle quickly and/or fully, it's input is disregarded anyway, and ECU relies on main fuel and ignition map (manifold pressure vs. rpm).
It would be a good idea to test voltage on the MAP sensor with engine stationary and ignition off also - should be about 4.5 V or above. With engine idling, voltage should also reach near that value on brief throttle kick (on my case, diag. device was showing up to 980 mbar, which I suppose is normal, since there's almost no vacuum at that moment).
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For the ES9J4:
5V feed to the MAP
4V signal from the MAP with engine stopped.
When engine starts it should quite quickly drop to 0.7V
No drop equals faulty sensor.
Or:
4-5.8V at 0 m/bar vacuum
2.5 - 3.7V at 300 m/bar vacuum
1.3 - 2.0 V at 600 m/bar vacuum
Source: Car Mechanics Magazine - February 2000
5V feed to the MAP
4V signal from the MAP with engine stopped.
When engine starts it should quite quickly drop to 0.7V
No drop equals faulty sensor.
Or:
4-5.8V at 0 m/bar vacuum
2.5 - 3.7V at 300 m/bar vacuum
1.3 - 2.0 V at 600 m/bar vacuum
Source: Car Mechanics Magazine - February 2000