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:
Inspection procedure
1 Inspect terminal voltage(od – body ground)
Disconnect the cruise control ecu connector.
turn the ignition switch to the on position.
measure the voltage between terminal od of cruise control
ecu and body ground.
Standard:
2 Inspect terminal voltage(od1 – body gr ...
Speed control main switch assy
Replacement
1. Disconnect battery negative terminal
2. Inspect place front wheels facing straight ahead
3. Remove horn button assy
4. Remove steering wheel assy
sst 09950–50013 (09951–05010, 09952–05010, 09953–05020, 09954–05021)
5. Remove speed control main switch assy
Remove the 2 sc ...
Initialization
1. Reset memory
Caution:
perform the reset memory (at initialization) when replacing the automatic
transaxle assy, engine
assy or ecm.
Notice:
hand–held tester only
Turn the ignition switch off.
connect the hand–held tester to the dlc3.
turn the ignition switch to the on ...