Engine Control System Tests W/codes: Other Toyota Avalon XX10 рестайлинг

* PLEASE READ FIRST *

Note. Before performing any diagnostic test, refer to SELF-DIAGNOSTICS INTRODUCTION for diagnostic system functions and system diagnostic procedures. For component location, see appropriate illustration in 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

Following conditions continue for more than 10 seconds with engine speed of 900 RPM or less

1. Throttle valve fully closed.
2. MAF sensor output is more than 2.2 volts.

Following conditions continue for more than 10 seconds with engine speed of 1500 RPM or more

1. VTA circuit signal is .63 volt or more.
2. MAF sensor output is less than one volt.

DTC is set when ECT sensor signal value is out of range during engine operation. Possible causes are

1. ECT sensor.
2. Cooling system.

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 bank No. 1, sensor No. 1 voltage remains at .4 volt or more, or .6 volt or less during idle, once engine is at normal operating temperature. DTC P0150 is set when bank No. 2, 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. Heated 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

1. Heated oxygen sensor.

DTC P0135 is for bank No. 1, sensor No. 1. DTC P0155 is for bank No. 2, sensor No. 1. 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 when heater operates.

Possible causes are

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

Note. For information on engine immobilizer system, see COMPUTERIZED ENGINE CONTROLS in THEORY/OPERATION article.

DTC is set when bank No. 1, sensor No. 2 voltage remains at .4 volt or more, or .6 volt during vehicle operation (31 MPH or more), once engine is at normal operating temperature. Possible cause is

1. Heated oxygen sensor.

DTC P0141 is for bank No. 1, sensor No. 2. 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 when heater operates.

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

DTCS P0301-P0306: CYLINDERS NO. 1-6 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.