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Discussion Starter #1
Model: Jimny 2001
Motor: G13bb ( 1.3 16v petrol engine ).
Map sensor: Denso 079800 4990

Sea level: 200 m.

Atmospheric pressure voltage: 3,6 v. ( measured from 'V-out', center connector of sensor )

Voltage with 20Hg vacuum : 1,5 v.

Idle voltage: 1,5 v. ( Warm motor at working temperature- open loop, 750-800 rpm, 20 inHg manifold vacuum ).

Question: Has someone tested MAP voltage at 20Hg vacuum and please checks my measures?

Thanks and regards.
 

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99 Tracker, 5 door, 2L, 4x4
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What exactly are your concerns ? The MAP operates on the 5vdc reference circuit... ~5vdc on a open circuit, decreasing as vacuum is applied.. The exact reading is not critical as the ECU uses the data in conjunction with others to control fuel delivery/at load..
 

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99 Tracker, 5 door, 2L, 4x4
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This may help
 

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Discussion Starter #4
Thanks for the help,

Jimny petrol G13bb engines uses only MAP/IAT, etc sensors, ( there is no MAF ), to calculate intake air flow.

I think ... a high idle voltage at the sensor can cause , ( incorrect/low pressure reading ), wrong mix or lean fuel condition.

Vacuum gauge indicates 20 inHg and fuel pressure, cops, sparks, advance, evap, egr, pcv, engine compression, etc are correct.

The only symptom i've found is the idle map sensor voltage, i find it too high at open loop condition.

I think it would be a good idea to connect an obd2-elm interface to discard it. 💡


Thanks again for attention,
Regards.
 
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