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Heated oxygen sensor (592-593), E39

Heated oxygen sensor (592-593), E39

Location

Front heated oxygen sensor (592), E39, located before the front catalytic converter,

Front heated oxygen sensor (592), E39.

Rear heated oxygen sensor (593), E39, located after the front catalytic converter,

Rear heated oxygen-sensor (593), E39 .

Main task

The heated oxygen sensors, located before and after the front catalytic converter respectively, act as a sensor for lambda control and is connected to ECM, E39 (590).

In order to work properly, the catalytic converters need a precise air/fuel blend that is regulated by the heated oxygen sensors and these need to be preheated for a quick reaction. The rear heated oxygen sensor is for both correcting the lambda control for minor faults in the front heated oxygen sensor and for setting DTCs if the catalytic converter is damaged.

Type

Lambda control is done with a front heated oxygen sensor (592) and a rear heated oxygen sensor (593) that, besides the oxygen sensor itself, contains a pulse width modulated preheating circuit consisting of oxygen sensor heating elements (271).

The output voltage of the oxygen sensors is proportional to the oxygen content in the exhaust and will be approx. 0.9 V at the front heated oxygen sensor at Lambda <1 and approx. 0.1 V at Lambda >1.

Front heated oxygen sensor (592).


Rear heated oxygen sensor (593).


Connection

592 pin no. Signal type Description
A Signal low Connected to ECM pin 26(B).
B Signal high Connected to ECM pin 10(B).
D Power supply, B+ Via crimp connection J215, from fuse 7 in petrol engine management system fuse box (727).
E Ground; pulse width modulated Connected to ECM pin 41(B).


593 pin no. Signal type Description
A Signal low Connected to ECM pin 28(B).
B Signal high Connected to ECM pin 12(B).
D Power supply, B+ Via crimp connection J215, from fuse 7 in petrol engine management system fuse box, (727).
E Ground; pulse width modulated Connected to ECM pin 42(B).



The oxygen sensor heating elements (271) are grounded to ECM, E39 (590), and powered from fuse 7 in the petrol engine management system fuse box (727) via crimp connection J215.