The automobile fault code P0691 indicates a problem with the cooling fan system. Symptoms include the engine light being on, the radiator fan not working, and the possibility of engine overheating. The most common cause is a faulty cooling fan relay or a problem with the wiring harness or connectors.
To fix the issue, visually inspect the wiring and connectors for any damage, such as broken or corroded pins. The repair time for this issue is estimated to be around 1.0 hour.
It is important to address this problem promptly to prevent further damage to the engine.
| Repair Importance Level | 10.0 (Out of 10) |
| Estimated Repair Time | Approximately 1.0 hour |
| Repair Difficulty Level | 10.0 (Out of 10) |
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Unveiling The Symptoms Of Fault Code P0691: A Comprehensive Guide
If you’re experiencing an illuminated engine light, an inoperative radiator fan, and potential engine overheating, you may be dealing with the p0691 fault code.
- The symptoms of the automobile fault code p0691 include: Engine Light ON (or Service Engine Soon Warning Light), radiator fan inoperative, and possible engine overheating.
Unraveling The Mystery: What Causes Fault Code P0691?
The automobile fault code p0691 can be caused by a faulty cooling fan relay, open or shorted relay harness, poor electrical connection, faulty cooling fan, faulty cooling fan control module, or a faulty engine control module (ECM).
- The fault code P0691 can be caused by: a faulty Cooling Fan 1 Relay, an open or shorted Cooling Fan 1 Relay harness, a poor electrical connection in the Cooling Fan 1 Relay circuit, a faulty Cooling Fan 1, a faulty Cooling Fan Control Module, or a faulty Engine Control Module (ECM).
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Fixing Code P0691: Simple Steps To Resolve The Issue
To fix the p0691 fault code, start by visually inspecting the wiring harness, connectors, and components for any damage or corrosion.
- To fix the automobile fault code p0691, start by checking the possible causes mentioned above.
- Then, visually inspect the wiring harness and connectors related to the issue.
- Look for any damaged components and check for broken, bent, pushed out, or corroded connector pins.
- This fix typically takes around 1.0 hour to complete.
Cracking The Code: P0691 – Cost And Complexity Unveiled!
The factors influencing the diagnosis and fixing cost of the automobile fault code p0691 are the estimated repair time of 1.0 hour and the average hourly rate charged by auto repair shops, which ranges between $75 and $150.
P0691: Engine Control Module (Ecm) Fan 1 Control Circuit Low
The P0691 fault code refers to a problem with the cooling fan control circuit. This circuit is responsible for controlling the speed of the electric cooling fan in the engine cooling system.
The Engine Control Module (ECM) sends a Pulse Width Modulated (PWM) signal to the cooling fan control module, which then adjusts the voltage drop across the cooling fan motor to vary the fan speed. The ECM typically operates the cooling fan at specific percentages, but it can adjust these percentages based on cooling system requirements and generator demand.
The cooling fan control module is designed to protect itself from damage in case of a short circuit in the cooling fan motor. When the commanded state of the driver and the actual state of the control circuit do not match for more than 5 seconds, the P0691 fault code is triggered. This means that there is a discrepancy between what the ECM is telling the cooling fan to do and what the control circuit is actually doing.
It is important to note that the design of the cooling fan may vary between different vehicles and engines, so the specific details of the cooling fan system may differ.
FAQ
If you’re experiencing the symptoms of the automobile fault code P0691, such as the engine light being on, an inoperative radiator fan, and possible engine overheating, there are a few possible causes to consider. It could be a faulty cooling fan 1 relay, an open or shorted cooling fan 1 relay harness, a poor electrical connection in the cooling fan 1 relay circuit, a faulty cooling fan 1, a faulty cooling fan control module, or even a faulty engine control module (ECM). To fix the issue, visually inspect the wiring harness and connectors, checking for any damage or broken pins.
If you’re experiencing the p0691 fault code, you might notice that your engine light is on or that your radiator fan isn’t working properly. This could potentially lead to engine overheating, which is definitely something you want to avoid. The cause of this fault code could be a faulty cooling fan 1 relay, an open or shorted cooling fan 1 relay harness, a poor electrical connection in the cooling fan 1 relay circuit, a faulty cooling fan 1, a faulty cooling fan control module, or even a faulty engine control module (ECM). To fix the issue, make sure to visually inspect the wiring harness and connectors, checking for any damage or corrosion. Also, be on the lookout for broken, bent, pushed out, or corroded connector pins.
If you’re dealing with the p0691 fault code in your automobile, you may notice the engine light is on, the radiator fan isn’t working, and there’s a possibility of engine overheating. This issue is typically caused by a faulty cooling fan 1 relay, an open or shorted cooling fan 1 relay harness, poor electrical connection in the cooling fan 1 relay circuit, a faulty cooling fan 1, a faulty cooling fan control module, or a faulty engine control module (ECM). To fix it, visually inspect the wiring harness and connectors, checking for any damage or corrosion. Also, look out for broken, bent, pushed out, or corroded connector pins.
Wrap Up
To fix the P0691 fault code, start by visually inspecting the wiring harness and connectors.
Look for any damage or corrosion.
Check the Cooling Fan 1 Relay and the Cooling Fan Control Module for faults. If necessary, replace the faulty components.
Don’t forget to check the Engine Control Module (ECM) as well.
