The P0698: Fan 4 Control Circuit High code indicates that the control module has detected a higher-than-expected voltage in the control circuit for Fan 4. This can prevent the fan from functioning properly, which may result in inadequate engine cooling and potential overheating. High voltage can be caused by a faulty fan, wiring issues, or a malfunction in the control circuit.
P0698 – Quick Overview
| Code | Information |
|---|---|
| Meaning | P0698: Fan 4 Control Circuit High |
| Is it serious? | Yes, as high voltage can lead to improper fan operation and possible engine overheating. |
| Possible causes | – High voltage in Fan 4 control circuit – Faulty fan – Wiring issue |
| How to diagnose? | – Test fan 4 control circuit for voltage – Inspect wiring and connectors – Replace fan if necessary |
P0698 Meaning
The P0698 code indicates that the voltage in the control circuit for Fan 4 is higher than expected. This excessive voltage may prevent Fan 4 from functioning properly, leading to engine overheating if the fan is unable to operate as needed.
Step-by-step diagnostic guide
| Action | Description | Tools Needed |
|---|---|---|
| Check for Other Codes | Use an OBD-II scanner to check for additional codes related to the cooling system or fan control circuits for more information about the issue. | OBD-II Scanner |
| Test the Fan 4 Control Circuit for Voltage | Use a multimeter to measure the voltage in Fan 4’s control circuit. Compare the voltage readings with manufacturer specifications to verify if the voltage is too high. | Multimeter |
| Inspect Wiring and Connectors | Inspect the wiring and connectors leading to Fan 4 for any signs of damage, loose connections, or corrosion that could cause high voltage. | Flashlight, Multimeter |
| Test the Fan for Functionality | Test Fan 4 to ensure it is operating properly and not causing the high voltage issue. Replace the fan if it is malfunctioning. | Diagnostic Tool, Multimeter |
| Replace the Fan if Necessary | If Fan 4 is found to be faulty or malfunctioning, replace it to restore proper engine cooling and prevent overheating. | Replacement Fan, Tools |
| Clear the Code and Test | After repairs, clear the code using an OBD-II scanner and test the vehicle to ensure Fan 4 is functioning correctly and that the code does not return. | OBD-II Scanner, Vehicle Manual |
OBD-II scanner Buyer’s Guide
- Scanner features explained
- Different types of scanners
- Scanners for coding/odometer/ECU/checks
- Best picks + discount codes
I test OBD-II scanners and make DIY Engine diagnostics guides to help you solve your car problems without having to depend on the mechanic. A lot of them will try to scam you or are just no help at all. About Juraj Lukacko