Toyota Corolla Repair Manual: Inspection procedure
Hint
:
- when the throttle position is slightly opened (the accelerator pedal
is slightly depressed) because a
floor carpet is overlapped on the accelerator pedal, or if not fully
releasing the accelerator pedal, etc.,
Dtc p505 will possibly be detected.
- 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 Check other dtc output
- Connect the hand–held tester to the dlc3.
- turn the ignition switch on and push the hand–held tester main
switch on.
- read the dtcs.
Result:



2 Check connection of pcv hose


3 Check air induction system


4 Perform active test using hand–held tester(check iac valve
operation)
- Warm up the engine to the normal operating temperature.
- switch off all the accessories.
- switch off the a/c.
- shift the lever into the neutral position.
- connect the hand–held tester to the dlc3.
- select the item ”diagnosis / enhanced obd ii / active test / isc duty
ratio”.
- check that the engine rpm varies when changing the isc duty ratio.
Engine rpm:
engine rpm fluctuates up and down in response to the isc duty ratio variation.


5 Check a/c signal circuit


6 Check blockage of iac valve and passage to bypass throttle
valve


7 Check harness and connector

- Disconnect the i1 iac valve connector.
- turn the ignition switch on.
- measure the voltage between the terminals of the iac
valve wire harness side connector.
Standard:

- Reconnect the iac valve connector.


8 Check harness and connector(iac valve – ecm)

- Disconnect the i1 iac valve connector.
- disconnect the e3 ecm connector.
- check the resistance between the wire harness side connectors.
Standard (check for open):

Standard (check for short):


- Reconnect the ecm connector.
- reconnect the iac valve connector.


9 Inspect idle air control valve


Replace ecm
Obd ii scan tool (excluding hand–held tester):
1 Check other dtc output
- Connect the hand–held tester to the dlc3.
Result:



2 Check connection of pcv hose


3 Check air induction system


4 Check a/c signal circuit


5 Check blockage of iac valve and passage to bypass throttle
valve


6 Check harness and connector

- Disconnect the i1 iac valve connector.
- turn the ignition switch on.
- measure the voltage between the terminals of the iac
valve wire harness side connector.
Standard:

- Reconnect the iac valve connector.


7 Check harness and connector(iac valve – ecm)

- Disconnect the i1 iac valve connector.
- disconnect the e3 ecm connector.
- check the resistance between the wire harness side connectors.
Standard (check for open):

Standard (check for short):


- Reconnect the ecm connector.
- reconnect the iac valve connector.


8 Inspect idle air control valve


Replace ecm
The rotary solenoid type idle air control (iac) valve is located
under the throttle body and intake air bypassing the throttle
valve flows into the iac valve through the passage.
In this way ...
Dtc p0560 system voltage ...
Other materials:
Ecm/pcm processor
Dtc p0606 ecm/pcm processor
Monitor description
The ecm continuously monitors its internal circuits. This self–check insures
that the ecm is functioning properly.
If a malfunction is detected, the ecm will set the appropriate dtc and
illuminate the mil.
The two cpus, main and sub cpu ins ...
Customer problem analysis
Hint:
in troubleshooting, the problem symptoms must be confirmed
accurately, meaning that all preconceptions
must be set aside in order to make an accurate judgement. To ascertain what
the problem symptoms
are, it is extremely important to ask the customer about the problem and
cond ...
Circuit description
The park/neutral position switch detects the shift lever position and sends
signals to the ecm.
Monitor description
The park/neutral position switch detects the gearshift position and sends a
signal to the ecm.
For security, the park/neutral position switch detects the gearshift positio ...