Toyota Corolla (E120) 2002–2008 Repair Manual / Introduction / How to troubleshoot ecu controlled
systems / Problem symptoms table
Toyota Corolla (E120): Problem symptoms table
The suspected circuits or parts for each problem symptom are shown in the table below. Use this table to troubleshoot the problem when a normal code is displayed in the diagnostic trouble code chart but the problem is still occurring. Numbers in the table indicate the order in which the circuits or parts should be checked.
Hint: when the problem is not detected by the diagnostic system even though the problem symptom is present, it may be that the problem is occurring outside the detection range of the diagnostic system.
Other materials:
Throttle body assy
Components
Removal & installation and disassembly & reassembly
1. Drain coolant
2. Remove cylinder head cover no.2
Remove 2 nuts, 2clips and the cylinder head cover no. 2.
3. Remove air cleaner cap sub–assy
Disconnect the maf connector.
disconnect the vsv co ...
Engine oil
With the engine at operating temperature and turned off, check the oil level
on the dipstick.
■ Checking the engine oil
1 Park the vehicle on level ground. After warming up the engine and turning it
off, wait more than 5 minutes for the oil to drain back into the bottom of the engine.
2 ...
Fail–safe chart
If any of the following codes is recorded, the ecm enters the fail–safe mode.
Check for intermittent problems
Hand–held tester only:
by putting the vehicle’s ecm in the check mode, the 1 trip detection logic is
possible instead of the
2 trip detection logic, and the sensitivity to de ...