Achieva V6-3300 3.3L (1992)
Chart C-12B Wiring Diagram
CIRCUIT DESCRIPTION:
Battery voltage to operate the cooling fan motor is supplied to relay terminal "1". Ignition voltage to energize the relay is supplied to relay terminal "2".
When the ECM grounds CKT 535, the relay is energized and the cooling fan is turned "ON". When the engine is running, the ECM will turn the cooling
fan "ON" if the conditions for a coolant temperature sensor trouble code (14 or 15) are present or:
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The A/C pressure is requested and and A/C pressure is over 150 psi (1.78) volts.
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The coolant temperature is greater than 100~C (212~F).
TEST DESCRIPTION: Numbers below refer to circled numbers on the diagnostic chart.
1.
The cooling fan runs continuously if codes 14, 15 and/or 66 are present.
2.
CKT 535 is grounded or ECM is faulty if test light is "ON".
DIAGNOSTIC AIDS:
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If the owner complained of an overheating problem, it must be determined if the complaint was due to an actual boil over, or the hot light, or
temperature gauge indicated over heating.
^
Check for a mis-scaled coolant temperature sensor. Refer to "Coolant temperature vs. Resistance values" table See: Powertrain
Management/Computers and Control Systems/Testing and Inspection/Diagnostic Trouble Code Tests and Associated
Procedures/Manufacturer Code Charts/DTC 14and replace coolant temperature sensor if faulty. If good, diagnose basic cooling system
problem.