Toyota Corolla Repair Manual: How to proceed with troubleshooting
The hand–held tester can be used at step 3, 4, 5, 7, 10.
1 Vehicle brought to workshop
2 Customer problem analysis
3 Connect hand–held tester to dlc3
Hint
: if the display indicates a communication fault in the tool, inspect dlc3.
4 Check dtc and freeze frame data
Hint
: record or print dtc and freeze frame data, if needed.
5 Clear dtc and freeze frame data
6 Visual inspection
7 Setting check (test) mode diagnosis
8 Problem symptom confirmation
Hint
: if the engine does not start, perform steps 10 and 12 first.
| A | Malfunction does not occur |
| B | Malfunction occurs |
B go to step 10
9 Symptom simulation
10 Dtc check
| A | Malfunction code |
| B | No code |
B go to step 12
11 Dtc chart
Go to step 14
12 Basic inspection
| A | Wrong parts not confirmed |
| B | Wrong parts confirmed |
B go to step 17
13 Problem symptoms table
| A | Wrong circuit confirmed |
| B | Wrong parts confirmed |
B go to step 17
14 Check ecm power source circuit
15 Circuit inspection
| A | Malfunction not confirmed |
| B | Malfunction confirmed |
B go to step 18
16 Check for intermittent problems
Go to step 18
17 Parts inspection
18 Identification of problem
19 Adjustment, repair
20 Confirmation test
End
Sfi system
...
Other materials:
On–vehicle inspection
1. Inspect air–fuel ratio compensation system
Hint:
you can also check the system by choosing ”data monitor”,
then ”o2 sensor output voltage” on the monitor of the
hand–held tester.
Connect the hand–held tester to the terminal 23 (ox1a)
@ 7 (e1) and 21 (ox1b) @ 7 (e1) of the ecm.
Cau ...
Circuit description
The side airbag sensor assy (lh) circuit consists of the diagnosis circuit
and lateral deceleration sensor, etc.
It receives signals from the lateral deceleration sensor, judges whether or not
the srs must be activated,
and detects diagnosis system malfunction.
Dtc b1141/33 is recorded wh ...
Circuit description
Refer to dtc p0120
Dtc no.
Dtc detection condition
Trouble area
P0121
The following condition is met 4 times. After the vehicle speed
has exceeded 19 mph (30 km/h) once, the throttle position
sensor output value is out of normal range when the throttle
...