What does code P1490 mean?

Q: What does code P1490 mean?

Low Speed Fan Control Relay Fault. P1490 on Mitsubishi vehicles indicates that the engine control module (ECM) has detected a fault in the low-speed cooling fan control relay circuit. The ECM monitors the relay's control wire and expects a specific voltage when the fan should be off, and a different voltage when it commands the fan on; a deviation from the expected value sets this code.

DTC codes / Mitsubishi codes / P1490

P1490 · MitsubishiLow Speed Fan Control Relay Fault

P1490 on Mitsubishi vehicles indicates that the engine control module (ECM) has detected a fault in the low-speed cooling fan control relay circuit. The ECM monitors the relay's control wire and expects a specific voltage when the fan should be off, and a different voltage when it commands the fan on; a deviation from the expected value sets this code.

SystemPowertrain

Code typeMitsubishi specific

SeverityMedium

Fix difficultyIntermediate

AreaAuxiliary emission controls

Guidance is general and written for Mitsubishi vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.