Toyota Corolla Repair Manual: Inspection procedure
Hint
:
- if different dtcs related to different systems that have terminal e2
as the ground terminal are output
simultaneously, terminal e2 may be open.
- Read freeze frame data using the hand-held tester or the obd ii scan
tool. Freeze frame data records
the engine conditions when a malfunction is detected. When troubleshooting,
it is useful for determining
whether the vehicle was running or stopped, the engine was warmed up or not,
the air–fuel ratio
was lean or rich, etc. At the time of the malfunction.
Hand–held tester:
1 Read value of hand–held tester(throttle valve opening
percentage)

- Connect the hand–held tester to the dlc3.
- turn the ignition switch on.
- select the item ”diagnosis / enhanced obd ii /
data list / etcs / throttle pos” and read its value
displayed on the hand–held tester.
Result:



2 Inspect throttle position sensor

- Disconnect the t1 throttle position sensor connector.
- measure the resistance between the terminals of the
throttle position sensor.
Standard

- Reconnect the throttle position sensor connector.


3 Check harness and connector(ecm – throttle position sensor)

- Disconnect the e3 ecm connector.
- measure the resistance between the terminals of the e3
ecm connector.
Standard:

- Check the resistance between the terminals of the e3
ecm connector.
Standard (check for short):

- Reconnect the ecm connector.


Replace ecm
4 Inspect throttle position sensor

- Disconnect the t1 throttle position sensor connector.
- measure the resistance between the terminals of the
throttle position sensor.
Standard:

- Reconnect the throttle position sensor connector.


5 Check harness and connector(ecm – throttle position sensor)

- Disconnect the e3 ecm connector.
- disconnect the t1 throttle position sensor connector.
- check the resistance between the wire harness side connectors.
Standard (check for open):

Standard (check for short):

- Reconnect the throttle position sensor connector.
- reconnect the ecm connector.



Replace ecm
Obd ii scan tool (excluding hand–held tester):
1 Inspect throttle position sensor

- Disconnect the t1 throttle position sensor connector.
- measure the resistance between the terminals of the
throttle position sensor.
Standard:

- Reconnect the throttle position sensor connector.


2 Check harness and connector(throttle position sensor – ecm)

- Disconnect the e3 ecm connector.
- measure the resistance between the terminals of the e3
ecm connector.
Standard:

- Check the resistance between the terminals of the e3
ecm connector.
Standard (check for short):

- Reconnect the ecm connector.


The throttle position sensor is mounted in the throttle body and
detects the throttle valve opening angle.
When the throttle valve is fully closed, a voltage of approximately
0.3 To 1.0 V is ...
Dtc p0121 throttle/pedal position
sensor/switch ”a” circuit
range/performance problem
Hint:
this is the purpose of the ”throttle position sensor”. ...
Other materials:
Correct driving posture
1 Adjust the angle of the seatback so that you are sitting straight up and so
that you do not have to lean forward to steer.
2 Adjust the seat so that you can depress the pedals fully and so that your arms
bend slightly at the elbow when gripping the steering wheel.
3 Lock the head restraint ...
Overhaul
1. Inspect 4th gear thrust clearance
Using a feeler gauge, measure the 4th gear thrust clearance.
4Th gear thrust clearance:
2. Inspect 3rd gear thrust clearance
Using a dial indicator, measure the 3rd gear thrust clearance.
3Rd gear thrust clearance:
3. Inspect 4th gear ...
Using the radio
Radio operation
Select “AM” or “FM” to begin listening to the radio.
1 Power
2 Volume
3 Station selectors
4 Adjust frequency or select an item
5 AM/FM mode button
6 Scan for receivable stations
7 Seek a frequency
Setting station presets
1Search for a desired station by turning
or press ...