B02389
B02390
HEAT METHOD: When the problem seems to occur when the suspect area is heated.
2
NOTICE:
3
WATER SPRINKLING METHOD:
(1)
(2)
4
OTHER: When a malfunction seems to occur when electrical load is excessive.
When the malfunction seems to occur on a rainy day or in a
high-humidity condition.
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.
Sprinkle water onto the vehicle and check to see if the malfunc-
tion occurs.
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
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.
M a l f u n c-
tion
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.
(1)
(2)
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.
NOTICE:
IN-26
-
INTRODUCTION
HOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS
26
Author:
Date:
2001 SIENNA (RM787U)
