High Speed Radiator Fan Clutch Circuit Malfunction (Chrysler)
What does P1487 mean?
The P1487 code means the vehicle's onboard diagnostic system has detected: High Speed Radiator Fan Clutch Circuit Malfunction (Chrysler). This is a moderate severity code.
Common Symptoms
- Engine overheating in traffic or at idle
- Check Engine Light illuminated
- Radiator fan does not engage at high speed
- AC performance reduced in hot weather
- Temperature gauge climbs above normal
Probable Causes (Ranked by Likelihood)
- Failed fan clutch solenoid or relay Very High
- Faulty electronic fan clutch High
- Corroded wiring to the fan clutch Moderate
- Low coolant level causing false sensor readings Moderate
- PCM output circuit failure Low
Step-by-Step Diagnostic Procedure
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Check the fan clutch relay and fuse. Swap the relay with an identical one and test.
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Command the fan clutch to high speed using a scan tool and observe if the fan responds.
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Inspect the electrical connector at the fan clutch for corrosion or damage.
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Measure voltage at the fan clutch connector when commanded on. It should have battery voltage.
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Verify coolant level and check for air pockets that might affect temperature sensor readings.
Frequently Asked Questions
What is an electronic fan clutch?
Unlike traditional thermal fan clutches, an electronic fan clutch is controlled by the PCM via a solenoid. The PCM commands the clutch to engage based on coolant temperature, AC demand, and other inputs.
Can I replace just the solenoid or do I need the whole clutch?
On most Chrysler applications, the solenoid is part of the fan clutch assembly and cannot be serviced separately. The entire electronic fan clutch must be replaced.
Is this different from an electric fan problem?
Yes. This code relates to vehicles with a belt-driven fan that uses an electronic clutch to control engagement, not vehicles with fully electric cooling fans.