Toyota Corolla Quiz
Diagnostics

How to proceed with troubleshooting

In this manual: Diagnostics
Introduction — 31Preparation — 32Service specifications — 19Diagnostics — 497Engine control system — 6Fuel — 13Emission control — 28Exhaust — 3Cooling — 13Lubrication — 7Ignition — 3Starting & charging — 13Front suspension — 12Rear suspension — 9Tire & wheel — 1Drive shaft / propeller shaft — 15Brake — 42Automatic transmission / trans — 47Clutch — 19Steering column — 9Power steering — 11Heater & air conditioner — 20Supplemental restraint system — 27Seat belt — 12Lighting — 18Wiper & washer — 9Audio & visual — 12Wiring — 1Communication system — 1Windshield/windowglass/mirror — 31Seat — 10Theft deterrent & door lock — 10Sliding roof/convertible — 8Engine hood/door — 12Exterior/interior trim — 20Vehicle control system — 1Cruise control — 5Maintenance — 8
~1min read

The hand–held tester can be used at step 3, 4, 5, 7, 10.

1 Vehicle brought to workshop
2 Customer problem analysis
2 Customer problem analysis
3 Connect hand–held tester to dlc3
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
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
5 Clear dtc and freeze frame data
6 Visual inspection
6 Visual inspection
7 Setting check (test) mode diagnosis
7 Setting check (test) mode diagnosis
8 Problem symptom confirmation
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
9 Symptom simulation
10 Dtc check
10 Dtc check
A Malfunction code
B No code
B go to step 12
11 Dtc chart
11 Dtc chart
Go to step 14
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
13 Problem symptoms table
A Wrong circuit confirmed
B Wrong parts confirmed
B go to step 17
14 Check ecm power source circuit
14 Check ecm power source circuit
15 Circuit inspection
15 Circuit inspection
A Malfunction not confirmed
B Malfunction confirmed
B go to step 18
16 Check for intermittent problems
16 Check for intermittent problems
Go to step 18
Go to step 18 17 Parts inspection
18 Identification of problem
18 Identification of problem
19 Adjustment, repair
19 Adjustment, repair
20 Confirmation test
20 Confirmation test
End
End

Test yourself

A quick Toyota Corolla quiz: every answer comes with an explanation and a link to the manual page.