Engine Control System Tests W/codes - 4-Cylinder: Other Toyota Camry XV20

* PLEASE READ FIRST *

Note. Before performing any diagnostic test, refer to SELF-DIAGNOSTICS INTRODUCTION article for diagnostic system functions and system diagnostic procedures. For component location, see appropriate illustration in the appropriate THEORY/OPERATION article. References to California emissions apply to vehicles with California emissions, which may be verified by underhood Emission Control label. Vehicles with California emissions may be available in other states.

Condition

Vehicle speed must have exceeded 19 MPH at least once. DTC is set when TP sensor output voltage is out of range while vehicle speed is 0-19 MPH. Possible cause is

1. Throttle Position (TP) sensor.

DTC P0130 is set when sensor No. 1 voltage remains at .4 volt or more, or .6 volt or less during idle, once engine is at normal operating temperature. Possible causes are

1. Oxygen sensor.
2. Fuel trim.

DTC is set when ECM detects a response time of one second or more from sensor to change from rich to lean, or lean to rich. Possible cause is oxygen sensor.

DTC is set when either of the following conditions is present

1. Sensor heater current draw exceeds 2 amps.
2. Sensor heater current draw is .25 amp or less.

Possible causes are

1. Heated oxygen sensor open or short circuit.
2. Heated oxygen sensor heater.
3. ECM.

DTC is set when sensor No. 2 voltage remains at .4 volt or more, or .6 volt or less during vehicle operation (25 MPH or more), once engine is at normal operating temperature. Possible cause is

1. Oxygen sensor.

DTCS P0301-P0304: CYLINDERS NO. 1-4 MISFIRE DETECTED

Note. When 2 or more codes for a misfiring cylinder are recorded repeatedly, but DTC P0300 is not recorded, it indicates that misfires were detected and stored into ECM memory at different times.

Two conditions can cause code to set. These are

1. During any particular 200 revolutions of engine, misfiring is detected which can cause catalytic converter overheating and/or damage.
2. During any particular 1000 revolutions of engine, misfiring is detected which can cause a deterioration in emission levels.

For possible causes, see DTC P0300: RANDOM MISFIRE DETECTED test.

1. PNP switch short circuit.
2. PNP switch.
3. ECM.

Note. Toyota scan tool can be used to confirm PNP switch signal from CURRENT DATA.