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.
Circuit description
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 ...
Throttle/pedal position
sensor/switch ”a” circuit
range/performance problem
Dtc p0121 throttle/pedal position
sensor/switch ”a” circuit
range/performance problem
Hint:
this is the purpose of the ”throttle position sensor”. ...
Other materials:
Pre–check
1. Srs warning light check
Turn the ignition switch to the on position and check that
the srs warning light lights up.
check that the srs warning light goes out after approx.
6 Seconds.
Hint:
when the ignition switch is at on and the srs warning
light remains on or flashes, the ...
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 Inspect ecm(+b voltage)
Turn the ignition switch on.
measure the voltage between the terminals of the e4 and
e6 ecm connectors.
Standard:
2 Check harness and connector(ecm – body ground)
Disconnect the e4 ecm connector.
check the resistance between the wire ha ...