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Toyota Corolla Repair Manual: System too lean/rich

Dtc p0171 system too lean (bank 1)

Dtc p0172 system too rich (bank 1)

Inspection procedure
Hint: handheld tester only: narrowing down the trouble area is possible by performing a/f control active test (heated oxygen sensor or other trouble areas can be distinguished). Perform ac ...

Circuit description
The fuel trim is related to the feedback compensation value, not to the basic injection time. The fuel trim includes the shortterm fuel trim and the longterm fuel trim. The shortterm fuel tri ...

Other materials:

Data list/active test
1. Data list Hint: using the data list displayed by the handheld tester or the obd ii scan tool, you can read the value of the switches, sensors, actuators and so on without parts removal. Reading the data list as a first step of troubleshooting is one method to shorten diagnostic time. ...

General information
1. Basic dimensions (a) there are two types of dimensions in the diagram. (1) (Three-dimensional distance) straight-line distance between the centers of two measuring points. (2) (Two-dimensional distance) horizontal distance in forward/rearward direction between the centers o ...

Inspection procedure
1 Check unlock warning switch assy Disconnect the key unlock warning switch connector.  check the continuity between the terminals of the key unlock warning switch connector, as shown in the illustration and table. Standard: 2 Check wire harness (tvip ecu unlock warning ...

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