Toyota T100 1996 Service Manual page 24

2 HEAT METHOD: When the problem seems to occur when the suspect area is heated.
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.
NOTICE:
(1) Do not heat to more than 60 °C (140 °F). (Temperature
is limited not to damage the components.)
(2) Do not apply heat directly to parts in the ECU.
3 WATER SPRINKLING METHOD:
Sprinkle water onto the vehicle and check to see if the malfunc-
tion occurs.
NOTICE:
(1) Never sprinkle water directly into the engine
compartment, but indirectly change the temperature and
humidity by applying water spray onto the radiator front
surface.
(2) Never apply water directly onto the electronic
components.
(Service 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.
1996 TOYOTA T100 (RM449U)
INTRODUCTION − HOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS
When the malfunction seems to occur on a rainy day or in a
high−humidity condition.
M a l f u n c-
tion
ON
IN−21
V07469