D25085
B02389
ON
01--28
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INTRODUCTION
HOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS
COROLLA Supplement (RM1129E)
3.
WATER SPRINKLING METHOD: When the malfunc-
tion seems to occur on a rainy day or in high--humid-
ity.
(a)
Sprinkle water onto the vehicle and check if the malfunc-
tion occurs.
NOTICE:
S
Never sprinkle water directly into the engine compart-
ment. Indirectly change the temperature and humid-
ity by applying water spray onto the front of the radia-
tor.
S
Never apply water directly onto the electronic compo-
nents.
HINT:
If the vehicle has or had a water leakage problem, the leakage
may have damaged the ECU or connections. Look for evidence
of corrosion or short circuits. Proceed with caution during water
tests.
4.
HIGH ELECTRICAL LOAD METHOD: When a malfunc-
tion seems to occur when electrical load is exces-
sive.
(a)
Turn on the heater blower, headlamps, rear window de-
fogger and all other electrical loads. Check if the malfunc-
tion reoccurs.
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TOYOTA COROLLA REPAIR MANUAL SUPP 1129E
