Toyota Corolla Repair Manual: How to proceed with troubleshooting
1 Vehicle brought to workshop
2 Customer problem analysis
3 Check and clear dtcs and freeze frame data
4 Problem symptom confirmation
Symptom does not occur: go to
step 5
Symptom occurs: go to step 6
5 Symptom simulation
6 Dtc check
There is no output: go to step 7
There is output: go to step 8
7 Problem symptoms table
Check for fluid leakage and go
to step 10
8 Dtc chart
9 Circuit inspection
Hint
: when 2 or more dtc’s are recorded, and the problem is not identified, perform circuit inspection of the other dtc’s.
10 Identification of problem
11 Repair
12 Comfirmation test
End
Hint
: step 3, 6, 9, 12: diagnostic steps permitting the use of the hand–held tester.
Fail safe function:
when a failure occurs in the abs system, the abs warning light is lit and the abs operation is prohibited.
In addition to this, when the failure which disables the ebd operation occurs, the brake warning light is lit as well and the ebd operation is prohibited.
Other materials:
Inspection procedure
1 Check side squib(rh) circuit(airbag sensor assy center – front
seat airbag assy rh)
Disconnect the negative (–) terminal cable from the battery,
and wait at least for 90 seconds.
disconnect the connectors between the front seat airbag
assy (rh) and the airbag sensor assy center.
& ...
Circuit description
The variable valve timing (vvt) system includes the ecm, the oil control
valve (ocv) and the vvt controller.
The ecm sends a target ”duty–cycle” control signal to the ocv. This control
signal, applied to the ocv,
regulates the oil pressure supplied to the vvt controller. Camshaft timing
co ...
Malfunction in speedometer
Wiring diagram
Inspection procedure
1 Check combination meter assy
Remove the combination meter assy with connector still
connected.
check voltage.
Jack up either of the front wheels.
Shift the shift lever to neutral.
Turn the ignition switch to on ...