Toyota Corolla Quiz
Diagnostics

Basic inspection

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

When the malfunction is not confirmed in the dtc check, troubleshooting should be carried out in all the possible circuits considered as causes of the problem. In many cases, by carrying out the basic engine check shown in the following flowchart, the location causing the problem can be found quickly and efficiently. Therefore, using this check is essential in the engine troubleshooting.

1 Check battery voltage Notice

: carry out this check with the engine stopped and ignition switch off.
Ng charge or replace battery
Ng charge or replace battery
2 Check if engine will crank
2 Check if engine will crank Ng proceed to problem symptoms table on page
3 Check if engine starts
3 Check if engine starts Ng go to step 7
4 Check air filter
4 Check air filter
Toyota Corolla. Check air filter
  1. Visually check that the air filter is not excessively dirty or oily.
Notice

: if necessary, clean the filter with compressed air. First blow from the inside thoroughly, then blow from the outside of the filter.

 Ng clean or replace
5 Check idle speed
5 Check idle speed Ng proceed to problem symptoms table on page
6 Check ignition timing
6 Check ignition timing Ng proceed to page 14–1 and continue to troubleshoot
Proceed to problem symptoms table on page
Proceed to problem symptoms table on page 7 Check fuel pressure Ng proceed to page 11–1 and continue to troubleshoot
8 Check for spark
8 Check for spark Ng proceed to page 18–1 and continue to troubleshoot
Proceed to problem symptoms table on page
Proceed to problem symptoms table on page

Test yourself

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