P1490 – OBD-II DTC

OBD-II DTC P1490 – Power To Fan Circuit Overcurrent

DTC P1490 meaning

DTC P1490 refers to a diagnostic trouble code that indicates an overcurrent condition in the power to the fan circuit. This code is typically associated with the cooling fan system in a vehicle, which is responsible for regulating engine temperature. When the Engine Control Module (ECM) detects that the current flowing to the fan exceeds a predetermined threshold, it triggers this code to alert the technician of a potential issue.

DTC P1490 symptoms

Common symptoms associated with DTC P1490 may include:

• Engine overheating
• Cooling fan not operating
• Increased engine temperature readings on the dashboard
• Unusual noises from the fan area
• Check Engine Light illuminated

DTC P1490 causes

Several factors can lead to the triggering of DTC P1490, including:

• Faulty cooling fan motor
• Short circuit in the fan wiring
• Defective fan relay
• Issues with the ECM or its programming
• Corroded or loose electrical connections

DTC P1490 seriousness

DTC P1490 can be considered serious as it may lead to engine overheating, which can cause significant engine damage if not addressed promptly. Continuous operation of the vehicle under these conditions can result in costly repairs. Therefore, it is important to diagnose and resolve the issue as soon as possible.

How to diagnose DTC P1490

To diagnose DTC P1490, follow these steps:

1. Use an OBD-II scanner to confirm the presence of the P1490 code.
2. Inspect the cooling fan and its wiring for visible damage or corrosion.
3. Test the fan motor for proper operation using a multimeter.
4. Check the fan relay for functionality.
5. Examine the ECM for any software updates or faults.
6. Clear the code and perform a road test to see if the code reappears.

How to fix DTC P1490 step-by-step instructions

To fix DTC P1490, follow these step-by-step instructions:

1. Disconnect the battery to ensure safety while working on electrical components.
2. Inspect and repair any damaged wiring or connectors related to the cooling fan.
3. Replace the cooling fan motor if it is found to be faulty.
4. Test and replace the fan relay if necessary.
5. Reconnect the battery and clear the DTC using an OBD-II scanner.
6. Start the engine and monitor the cooling fan operation to ensure it functions correctly.

How to erase DTC P1490

To erase DTC P1490, follow these steps:

1. Connect an OBD-II scanner to the vehicle’s diagnostic port.
2. Turn on the ignition without starting the engine.
3. Navigate to the “Erase Codes” or “Clear DTCs” option on the scanner.
4. Confirm the action to clear the trouble codes.
5. Disconnect the scanner and start the engine to verify that the code does not reappear.