Description
Refer to dtc p2195 (see page es-292).
Monitor description
The air-fuel ratio (a/f) sensor varies its output voltage in proportion to the air-fuel ratio. If the a/f sensor impedance (alternating current resistance) or output voltage deviates greatly from the standard range, the ecm determines that there is an open or short in the a/f sensor circuit.
Monitor strategy
Typical enabling conditions
Typical malfunction thresholds
Wiring diagram
Inspection procedure
Hint:
Hint:
Intelligent tester only: malfunctioning areas can be identified by performing the a/f control function provided in the active test. The a/f control function can help to determine whether the air-fuel ratio (a/f) sensor, heated oxygen (ho2) sensor and other potential trouble areas are malfunctioning.
The following instructions describe how to conduct the a/f control operation using the intelligent tester.
Hint:
Standard
Notice:
The a/f sensor has an output delay of a few seconds and the ho2 sensor has a maximum output delay of approximately 20 seconds.
Following the a/f control procedure enables technicians to check and graph the output voltages of both the a/f and ho2 sensors.
To display the graph, select the following menu items on the tester: diagnosis / enhanced obd ii / active test / a/f control / user data / afs b1 s1 and o2s b1 s2; then press the yes button and then the enter button followed by the f4 button.
Hint:
Read freeze frame data using the intelligent tester. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.
Fuel injector
Components
Removal
Discharge fuel system pressure
Caution:
Discharge fuel system pressure
procedures must be performed before
disconnecting any part of the fuel system.
After performing the discharge fuel system
pressure procedures, pressure will remain in
the fuel line ...
Abs warning light does not come on
Wiring diagram
Refer to the abs warning light circuit (see page bc-135).
Inspection procedure
Check can communication system
Check if the can communication system dtc is output
(see page ca-34).
Result
Perform active test by intelligent tester (abs warning light)
Sele ...
Check for short circuit
If the wire harness is ground shorted (fig. 5), Locate
the section by conducting a resistance check with
the body ground (below).
Check the resistance with the body ground.
Disconnect connectors a and c, and measure
the resistance
Standard resistance (fig. 6)
Hint:
Measure ...