Use Diagnostic Trouble Codes (DTCs) (from the DTC checks) in the table below to determine the trouble area and proper inspection procedure. The Supplemental Restraint System (SRS) diagnostic trouble code chart is shown below as an example.

Symptom simulation
Problem symptoms tableThermostat (2AZ-FE)
REPLACEMENT
1. DRAIN ENGINE COOLANT (See page 16-6 )
2. REMOVE FAN AND GENERATOR V BELT (See page 14-5 )
3. REMOVE GENERATOR ASSY (See page 19-16 )
4. DISCONNECT RADIATOR HOSE INLET
5. REMOVE WATER INLET
(a) Remove the 2 nuts and disconnect the water inlet from
the cylinder block.
6. REM ...