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.
1 Read value of hand–held tester or obd ii scan tool(intake air
temperature)
- Connect the hand–held tester or the obd ii scan tool to the dlc3.
- turn the ignition switch on and push the hand–held tester or the
obd ii scan tool main switch on.
- select the item ”diagnosis / enhanced obd ii / data list / all /
intake air” and read its value
displayed on the hand–held tester or the obd ii scan tool.
Temperature: same value as the actual intake air temperature.
Result:

Hint
:
- if there is an open circuit, the hand–held tester or the obd ii scan
tool indicates –40 °C (–40°f).
- If there is a short circuit, the hand–held tester or the obd ii scan
tool indicates 140 °C (284°f) or more.


2 Read value of hand–held tester or obd ii scan tool(check for
open in wire harness)

- Disconnect the m1 mass air flow sensor connector
- connect terminals tha and e2 of the mass air flow sensor
wire harness side connector.
- turn the ignition switch on.
- select the item ”diagnosis / enhanced obd ii /
data list / all / intake air” and read its value displayed
on the hand–held tester or the obd ii scan tool.
Temperature value: 140 °C (284°f) or more
- reconnect the mass air flow sensor connector.



3 Read value of hand–held tester or obd ii scan tool(check for
open in ecm)

- Disconnect the m1 mass air flow sensor connector.
- connect the terminals tha and e2 of the e3 ecm connector.
Hint
:
before checking, do a visual and contact pressure check on the
ecm connector.
- turn the ignition switch on.
- select the item ”diagnosis / enhanced obd ii /
data list / all / intake air” and read its value displayed
on the hand–held tester or the obd ii scan tool.
Temperature value: 140 °C (284°f) or more
- reconnect the mass air flow sensor connector.



Confirm good connection at ecm. If ok, replace ecm
4 Read value of hand–held tester or obd ii scan tool(check for
short in wire harness)

- Disconnect the m1 mass air flow sensor connector.
- turn the ignition switch on.
- select the item ”diagnosis / enhanced obd ii /
data list / all / intake air” and read its value displayed
on the hand–held tester or the obd ii scan tool.
Temperature value: –40 °C (–40°f)
- reconnect the mass air flow sensor connector.


5 Read value of hand–held tester or obd ii scan tool(check for
short in ecm)

- Disconnect the e3 ecm connector.
- turn the ignition switch on.
- select the item ”diagnosis / enhanced obd ii /
data list / all / intake air” and read its value displayed
on the hand–held tester or the obd ii scan tool.
Temperature value: –40 °C (–40°f)
- reconnect the ecm connector.



Replace ecm
The intake air temperature (iat) sensor, mounted on the mass
air flow (maf) sensor, monitors the intake air temperature. The
iat sensor has a thermistor that varies its resistance depending
on ...
Dtc p0115 engine coolant temperature circuit
Dtc p0117 engine coolant temperature circuit
low input
Dtc p0118 engine coolant temperature circuit
high input ...
Other materials:
Engine immobilizer system
The vehicle’s keys have built-in transponder chips that prevent the engine
from starting if a key has not been previously registered in the vehicle’s on-board
computer.
Never leave the keys inside the vehicle when you leave the vehicle.
Vehicles without a smart key system: The indicator light ...
Inspection procedure
1 Check p/t squib(lh) circuit(airbag sensor assy center – front seat
outer belt assy lh)
Disconnect the negative (–) terminal cable from the battery,
and wait at least for 90 seconds.
disconnect the connectors between the airbag sensor
assy center and the seat belt pretensioner ...
Sliding roof/convertible
Service data
Torque specification
Engine hood/door
Torque specification
Exterior/interior trim
Torque specification
Cruise control
Service data
Torque specification
...
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