IN−28 − INTRODUCTION HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS HEAT METHOD: When the problem seems to occur when the suspect area is heated. 2 Heat the component that is the likely cause of the malfunction with a hair dryer or similar object. Check to see if the malfunction occurs. M a l f u n c- tion NOTICE: (1) Do not heat to more than 60 ° C (140 ° F). (Temperature is limited not to damage the components.) Do not apply heat directly to parts in the ECU. (2) 3 WATER SPRINKLING METHOD: When the malfunction seems to occur on a rainy day or in a high−humidity condition. Sprinkle water onto the vehicle and check to see if the malfunc- tion occurs. NOTICE:
(1) Never sprinkle water directly into the engine compart- ment, but indirectly change the temperature and hu- midity by applying water spray onto the radiator front surface. Never apply water directly onto the electronic compo- nents. (2) HINT: If a vehicle is subject to water leakage, the leaked water may contaminate the ECU. When testing a vehicle with a water leak- age problem, special caution must be taken. 4 OTHER: When a malfunction seems to occur when electrical load is excessive. Turn on all electrical loads including the heater blower, head lights, rear window defogger, etc. and check to see if the mal- function occurs. ON B02389 B02390 28 Author : Date: