The P0694: Fan 2 Control Circuit High code indicates that the control module has detected higher-than-expected voltage in the control circuit for Fan 2. This can cause the fan to malfunction, leading to inadequate engine cooling and potential overheating. High voltage can result from a faulty fan, wiring issues, or a malfunction in the control circuit.
P0694 – Quick Overview
| Code | Information |
|---|---|
| Meaning | P0694: Fan 2 Control Circuit High |
| Is it serious? | Yes, as improper fan operation can lead to engine overheating. |
| Possible causes | – High voltage in Fan 2 control circuit – Faulty fan – Wiring issue |
| How to diagnose? | – Test fan 2 control circuit for voltage – Inspect wiring and connectors – Replace fan if necessary |
P0694 Meaning
The P0694 code means that the control module has detected a higher-than-expected voltage in the control circuit for Fan 2. This high voltage condition could prevent the fan from operating correctly, leading to potential overheating of the engine.
Step-by-step diagnostic guide
| Action | Description | Tools Needed |
|---|---|---|
| Check for Other Codes | Use an OBD-II scanner to check for additional related codes affecting the fan control circuit or other components of the cooling system. | OBD-II Scanner |
| Test the Fan 2 Control Circuit for Voltage | Use a multimeter to measure the voltage in the Fan 2 control circuit. Compare the readings with manufacturer specifications to verify whether the voltage is too high. | Multimeter |
| Inspect Wiring and Connectors | Inspect the wiring and connectors leading to Fan 2 for damage, corrosion, or loose connections that could be causing a high voltage condition. | Flashlight, Multimeter |
| Test the Fan for Functionality | Test Fan 2 to ensure it is operating correctly and is not contributing to the high voltage issue. Replace Fan 2 if it is malfunctioning. | Diagnostic Tool, Multimeter |
| Replace the Fan if Necessary | If Fan 2 is 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 that Fan 2 is functioning properly and that the code does not return. | OBD-II Scanner, Vehicle Manual |
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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