schematics and diagrams: o2 sensor

Showing posts with label o2 sensor. Show all posts

Thursday, June 7, 2012

2002 Mazda MPV: Heater Low Circuit?

Error code P0037, H025, BANK 1 SENSOR 2, HEATER CIRCUIT LOW.

This is the O2 sensor located behind the Cat on the back side of the engine exhaust manifold.

To determine if the heater is bad, a resistance reading can be made on the heater pins at the plug to the O2. These would be the connectors that the Light Green and Black/White wire on the engine harness connect too. There should be resistance of 14.2 to 18.9 ohms. Anything more or less of these values, replace the O2.

And in case of P0031, HO2S Bank 1 Sen 1
Heater Circuit Low
The firewall side of the engine is Bank 1 for the MPV, the radiator side is Bank 2. So that code is pointing to a problem in the heater circuit for the sensor near the firewall before the convertor. You can check resistance of the heater circuit of the sensor. If should have 5-7 ohms, if not then the sensor is definitely bad.

AND IN CASE OF
P0031 H02S BANK 1 SEN 1, HEATER CIRCUIT LOW, WHERE IS THIS SENSOR LOCATED AND IS IT UPSTREAM OR DOWNSTREAM.

THe Oxygen Sensor at Bank1 Sensor1 is mounted to the exhaust manifold on the side of the engine closest to the firewall. This is a "Sensor 1" so it is labeled as an "Upstream" sensor.

See the help diagram shown below:----

Mazda Sensor parts location

This details will help.
Thanks.

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Tuesday, February 21, 2012

How to compare pattern of left bank and right bank sensors?

Simple.Try this.

Put the pico scope tool on the camshaft sensors and compare the pattern for the left bank to the right bank then compare the correlation timing of the crankshaft position sensor to the left bank VVT sensor and also crankshaft position sensor to the right VVT sensor and see if there's any difference between the right and left bank VVT sensors. Before that pull the connectors from the sensors and check for pin fit, corrosion or any rodent damage to the wiring harness.

This will help.

Thanks.

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Wednesday, December 14, 2011

Bank 2 Sensor 1 Heater circuit Failure?

You get check engine light on dash.In this case Engine computer module called ECM has to be scanned.
In scanning you get error code P0155.
This error code means.Bank 2 Sensor 1 heater failure.
This refers to the heater inside one of your oxygen sensors. The computer is not reading current to the heater. The problem may be the wires or the sensor itself. The thing to do is to check for voltage at the sensor connector with the key turned on. This particular sensor is right on the front of the engine by the radiator. If the voltage is there, the sensor is probably bad. You can also test the sensor heater with an ohmmeter as follows:
Testing Heating Element
Before Testing any electrical component, inspect the wiring and connectors for damage. Also wiggle the connectors to ensure a that they are firmly engaged.
Disconnect the electrical harness from each of the sensors.
The white wires in the sensor connector are the power and ground circuits for the heater.
Connect the ohmmeter test leads to the terminals of the white wires in the heated oxygen sensor connector.
Check the resistance of the sensor, if it is not within 4-7 ohms, replace the sensor.
The picture below is the sensor on bank 1, by the firewall. The one you want (bank 2, sensor 1) is on the front of the engine.

See the Sample diagram shown below :----

This details will help you.

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Monday, December 5, 2011

1995 Oldsmobile Eighty Eight has bad O2 Sensor?

If you need dis-assembly or replacement instructions for any other auto/car part, or you want to ask question related to your car/truck jeep problem then please leave the comment with your details, so I can provide you the required instructions and solutions.

O2 sensor gets faulty,there are many indications.But first the fault code has to be tested.Is there check engine light on dash.Did you got bad O2 sensor error code in car scan.
An O2 sensor that is not functioning correctly or is reading a lean or rich fuel mixture turn on the check engine light in the dash, this is an Orange indicator. There are other reasons like the heater circuit in the O2 is defective, that is a different code. On this car you can read the signal out of the O2's using a special tool called a scanner, it plugs into the diagnostic port under the dash in front of the driver.So first get this confirmed,before directly confirming,that O2 sensor is bad.

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This will help.Thanks.

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