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[Solved] Peugeot 307 Lift 2008 1.6 HDI 110: Radiator Fan 1st Gear Issue, P0694 Error & Resistor Replacement

piotrek333 20256 18
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How can I fix a Peugeot 307 radiator fan that skips first speed, starts immediately at high speed, and shows P0694 low-speed fan control error?

Check the wiring between the fan module and the engine ECU, because the low-speed command comes from the injection calculator and an open circuit can trigger P0694 and make the fan fall back to high speed [#16645130] Disconnect the battery, unplug the ECU and fan module, then test the D4 wire (cable 1550Z) from the black 32-pin ECU connector to pin 2 of the fan module with a 55 W bulb; if grounding D4 makes the fan run in first gear, the ECU is faulty, and if it does not, the wire is broken [#16645130] Another useful check is continuity of the thin control wires between the fan controller and the motor controller pins [#16642272] In the end, the fault was the engine driver/ECU itself: it had burnt tracks and bad soldering, and replacing and coding it restored first-speed fan operation and the climate system [#17239076]
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  • #1 16641864
    piotrek333
    Level 10  
    Posts: 30
    Rate: 10
    Hello everyone, I have a problem with the car radiator fan: Peugeot 307 lift 2008 1.6 1.6 hdi 110. I do not work the first gear of the fan, i.e. after switching on the valve the second gear starts immediately, after connecting under Lex it shows the error of controlling the low speed of the fan P0694 when trying to force by interface first gear is nothing happens while the second gear starts without a problem. I dumped the old driver-fan resistor I installed a new one and then the same, this driver has two plugs one with thicker cables double the other with thinner cables quadruple, the second gear is still there and the first one is gone and the same error pops up. Please help !!!!
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  • #2 16642272
    sulof1601
    Level 26  
    Posts: 598
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    Hello, these thin wires indicate which gear should be engaged. 1 pin in this cube goes to pin B2 of the motor controller, 2 pin to the D4 controller, 3 pin to the fuse, 4 pin to the C4 motor controller. Check the continuity of these wires.
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  • #3 16642492
    piotrek333
    Level 10  
    Posts: 30
    Rate: 10
    Ok thanks for the hint certainly check
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  • #4 16643756
    piotrek333
    Level 10  
    Posts: 30
    Rate: 10
    The cables are checked, ok, these are big fuses, too, mentioning that the fan starts immediately after firing a cold car without the air conditioner switched on at high speed.
  • Helpful post
    #5 16643773
    sulof1601
    Level 26  
    Posts: 598
    Help: 94
    Rate: 280
    Cool and what temperature does the engine controller see?
  • #6 16643784
    piotrek333
    Level 10  
    Posts: 30
    Rate: 10
    I will connect lexie and check soon
  • Helpful post
    #7 16643796
    grala1
    VAG group specialist  
    Posts: 9812
    Help: 1495
    Rate: 5036
    Give a description of the error and its context - show print screenshots.
    What is the engine code?
    What type of air conditioning.
    Disconnect the 4-pin plug at the fan controller.
    On the pin 3 of the controller socket, enter the plus and see if you give the weight for the pin 2, the first gear will appear and if you give the weight for the pin 1, the second gear will appear.
    Then you will know if everything is ok on the module and fan side.
    Give the fan module a picture.
    Which fan run starts after starting the car?
    If he doesn't see the engine temperature, he will start the fan just in case.
  • #8 16643816
    piotrek333
    Level 10  
    Posts: 30
    Rate: 10
    Pokaxuje normal 36 and one more thing when I tried to clear the error, after the restart I started the engine without the air conditioning on and the fan did not start and as soon as I turned on the fan the fan starts at high speed and when I turn off the fan the fan goes on, the car lights up again and the fan starts again at high revolutions
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  • #9 16643850
    grala1
    VAG group specialist  
    Posts: 9812
    Help: 1495
    Rate: 5036
    Does Klima work?
    What pressure does the air conditioning sensor see when the fan is running?
  • #10 16643879
    piotrek333
    Level 10  
    Posts: 30
    Rate: 10
    I just had a problem with the climate and that is why I came to the mechanist from the klima and he told me that the pressure sensor of the klima to be replaced and the fan controller because it is not the first gear both I exchanged for a used controller I checked the voltage on pin 3 and first the mass on pin 1 and then on 2 and in both cases there was a switch on the big socket of this driver
  • #11 16644513
    tytan58
    Level 20  
    Posts: 274
    Help: 42
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    But you have to burden this transition with a reflector bulb to make sure it's OK.
  • #12 16644620
    piotrek333
    Level 10  
    Posts: 30
    Rate: 10
    You can describe exactly what and how to do with this bulb. Please

    Added after 52 [minutes]:

    grala1 wrote:
    Does Klima work?
    What pressure does the air conditioning sensor see when the fan is running?
    I do not see anywhere in the Lexi preview option what pressure I see but I think that the sensor would not affect the fan unless I want to force a small run through Lexie? Because when I try to deie options forcing the fan slow and fast run and when forced slow does not start and when forced fast

    Added after 7 [minutes]:

    grala1 wrote:
    Give a description of the error and its context - show print screenshots.
    What is the engine code?
    What type of air conditioning.
    Disconnect the 4-pin plug at the fan controller.
    On the pin 3 of the controller socket, enter the plus and see if you give the weight for the pin 2, the first gear will appear and if you give the weight for the pin 1, the second gear will appear.
    Then you will know if everything is ok on the module and fan side.
    Give the fan module a picture.
    Which fan run starts after starting the car?
    If he doesn't see the engine temperature, he will start the fan just in case.
    1.6 hdi 110 engine 2008 climatronik two-zone and as I wrote earlier I checked 12v on pin 3 and mass on 2 and the fan started in slow gear and this spiral next to the fan controller was heating up then I am sending a photo of the error
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    • Peugeot 307 Lift 2008 1.6 HDI 110: Radiator Fan 1st Gear Issue, P0694 Error & Resistor Replacement 20170812_122416.jpg (707.78 KB) You must be logged in to download this attachment.
  • #13 16645052
    tytan58
    Level 20  
    Posts: 274
    Help: 42
    Rate: 153
    piotrek333 wrote:
    You can describe exactly what and how to do with this bulb. Please

    if you were checking it on the table, you have to load the output, if you had a fan connected, you don't have to.
  • Helpful post
    #14 16645130
    grala1
    VAG group specialist  
    Posts: 9812
    Help: 1495
    Rate: 5036
    The letter code of the engine is included in the VIN number, e.g. 9HY or 9HZ - this is for the future to show that there are several models of the engine with the same power and giving the same power does nothing too much.
    As for the pressure sensor, this information can be in the engine calculator because it is connected to the sensor and the engine calculator controls the fan and not the air conditioning controller ..
    If he sees too much pressure, he should turn on the fan to break it down.
    Since giving the weight to 2 pin you start the fan in the first gear, no signal from the engine calculator on the module.
    This is also said in the error - fault characteristics - the system is open.
    You have a wire break between the engine calculator and the module, or a broken calculator.
    Do it: disconnect the battery.
    On the injection calculator you have 3 plugs, from the left black 32-pin, middle 32-pin gray, right-hand 48-pin brown.
    Disconnect these plugs, connect the battery. Turn the ignition on and to the 32-pin black plug to pin D4 (cable number 1550Z) enter the weight.
    The fan should then start in first gear.
    If it starts, you have a faulty injection calculator, as it does not start, the broken wire between the injection calculator and the fan module.
    How to check this cable correctly using a light bulb: disconnect the battery, disconnect the left, black 32-pin plug on the engine calculator and the black 4-pin plug on the fan module. On the black 32-pin plug of the engine calculator, you give a plus on pin D4 (cable number 1550Z). To pin 2 of the black plug of the fan module (1550Z cable) you connect one of the poles of the bulb (e.g. 55W bulb), the other pole of the bulb is connected to ground and at this moment it is to light up.
    In short, the point is that the test cable should be used to power the bulb because the meter can be shown to be functional, but after connecting the bulb it will not light because there is a large voltage drop, e.g. on a connector or the cable stays on one thread.
    In French cars, one does not look at the colors of the wires, but their number, which are next to the plugs marked on the insulation of the wires.
    Very important note - do not disconnect or connect the injection calculator when the battery is connected. Do this only when the car has no power - disconnected battery.
  • #15 16645289
    piotrek333
    Level 10  
    Posts: 30
    Rate: 10
    Write please how does the driver change look like and what is the cost?

    Added after 2 [hours] 42 [minutes]:

    I did as you wrote but after unplugging the motor controller there is + 12v on the fan controller. I am surprised by one more reason why after starting the car the fan controller will switch to the second gear.
  • #16 16653274
    piotrek333
    Level 10  
    Posts: 30
    Rate: 10
    Anyone else have any ideas? One more airflow, once it cools down, I don't really know what's going on
  • #17 16773629
    piotrek333
    Level 10  
    Posts: 30
    Rate: 10
    Hello dear colleagues, does anyone have any idea what to discuss what to mention? I still have a problem with the fan, there is a car electronics in my town but I don't want to take it because I have a lot of work - at least that's what I say, and my fan still doesn't work as it should and starts immediately in second gear even on a cold engine, and as it wants lexie force the first gear it does not work, forcing the second gear is no problem, the relay replaced and then the same, colleague Grala suggests a damaged injection calculator but I would like to be sure that this is the problem here, maybe you know how to check it before I have to drive from 200km to some good electronics. Help !!!
  • #19 17239076
    piotrek333
    Level 10  
    Posts: 30
    Rate: 10
    Hello everyone, problem solved fan works in 1st gear and climate works and all thanks to a colleague GRALA1, this man knows what he is writing and really helps. The problem, as GRALA1 predicted, was the engine driver after replacing and coding everything works beautifully, by the way the coding engineer showed me an unscrewed controller and burned paths and some inefficient soldering, the trader apparently fumbled something before selling and made a short circuit and some solder soldered it to him and he car sold. Subject to close and thank you again colleague GRALA1
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Topic summary

✨ The discussion revolves around a malfunctioning radiator fan in a 2008 Peugeot 307 Lift with a 1.6 HDI 110 engine, specifically concerning the first gear not engaging and the appearance of a P0694 error code. The user reports that the fan operates at high speed immediately upon starting the engine, bypassing the low-speed setting. Various troubleshooting steps are suggested, including checking wire continuity, verifying the engine controller's temperature readings, and testing the fan controller's pins for proper voltage. The user eventually discovers that the issue was due to a faulty engine driver, which was replaced, resolving the fan's operational problems. The discussion highlights the importance of proper diagnostics and the potential for wiring issues or component failures in automotive electrical systems.
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FAQ

TL;DR: Peugeot 307 1.6 HDi fan jumps to high speed when the low-speed circuit fails (1 fault code: P0694). Expert tip: "You have a wire break between the engine calculator and the module, or a broken calculator." [Elektroda, grala1, post #16645130]

Why it matters: This FAQ helps DIYers diagnose and fix no‑low‑speed radiator fan faults without replacing good parts.

Quick Facts

What does fault code P0694 mean on a Peugeot 307 1.6 HDi?

P0694 indicates the low-speed radiator fan control circuit is open. The engine ECU is not successfully commanding the fan module. This often traces to a broken control wire or a failed ECU output. The forum expert summarized it as an open system on the ECU-to-module path. [Elektroda, grala1, post #16645130]

Why does my fan go full speed on a cold start?

The ECU can trigger high speed as a failsafe when it does not trust temperature or pressure data. As the expert put it, if the ECU does not "see" engine temperature properly, it starts the fan just in case. This behavior matches the thread’s cold-start high-speed symptom. [Elektroda, grala1, post #16643796]

How do I bench-test the fan controller for low and high speeds?

Use the 4‑pin control plug at the fan module. Apply +12 V to pin 3. Ground pin 2 to command first (low) speed. Ground pin 1 to command second (high) speed. This isolates vehicle wiring and proves the module and fan motor. [Elektroda, grala1, post #16643796]

What is the exact pinout of the thin control plug?

Pin mapping: 1 goes to the ECU B2, 2 to ECU D4, 3 to a fused +12 V feed, and 4 to ECU C4. These are signal and supply references for fan speed selection. Verify continuity on each run with proper load testing. [Elektroda, sulof1601, post #16642272]

How do I load-test the D4 control wire with a bulb?

Disconnect the battery and both ends: ECU black 32‑pin and fan’s black 4‑pin. Feed +12 V to ECU plug pin D4. Connect a 55 W bulb between fan plug pin 2 and ground. The bulb must light. "Use a test load; meters can lie when one strand remains." [Elektroda, grala1, post #16645130]

My low speed works when I ground pin 2 manually. What does that prove?

It proves the fan module and motor can run at low speed. The missing element is the ECU’s control signal on the D4 path. Next steps are load-testing the D4 wire and evaluating the ECU low-speed driver output. [Elektroda, grala1, post #16645130]

Could a bad A/C pressure sensor cause the fan issue?

The engine ECU reads A/C pressure and controls the fan. Excess pressure can command the fan on. However, code P0694 points to an open low-speed control path. Verify pressure readings after fixing the control circuit. [Elektroda, grala1, post #16645130]

Why does Lexia show ~36°C but the fan still races?

The reported case showed about 36°C, yet the fan jumped to high speed when A/C was engaged and sometimes on restart. That pattern aligns with a control-path fault rather than actual overheating. Diagnose wiring and ECU output next. [Elektroda, piotrek333, post #16643816]

What finally fixed the P0694 and no low-speed fan on this car?

Replacing and coding the injection ECU resolved the fault. The opened unit showed burned tracks and poor soldering, suggesting prior damage. After ECU replacement, first speed and climate control operated correctly. [Elektroda, piotrek333, post #17239076]

Can I send the ECU for repair instead of driving to a shop?

Yes. The thread suggests mailing the ECU to a specialist for diagnosis and repair. This avoids travel when local auto electronics shops are busy or unavailable. Ask for testing of the fan control driver stage. [Elektroda, tytan58, post #16796704]

How do I safely work with the ECU connectors?

Always disconnect the battery before unplugging or plugging ECU connectors. The 1.6 HDi ECU has three plugs: left black 32‑pin, middle gray 32‑pin, right brown 48‑pin. Reconnect power only after plugs are secured. [Elektroda, grala1, post #16645130]

What’s a quick three-step procedure to confirm low-speed control?

  1. Unplug the 4‑pin fan control plug; key off.
  2. Apply +12 V to pin 3; ground pin 2 to command low speed.
  3. If low speed runs, load-test the D4 wire from ECU to pin 2 to find opens. [Elektroda, grala1, post #16643796]

What edge case can fool a multimeter during continuity checks?

A corroded wire may conduct lightly on a single strand. A meter shows continuity, but the circuit collapses under load. Use a 55 W bulb to reveal voltage drop and validate true current capability. [Elektroda, grala1, post #16645130]

How many ECU plugs does this engine use, and why does it matter?

It uses three plugs. Knowing locations speeds diagnosis: the D4 signal resides in the left black 32‑pin connector. That detail reduces guesswork and prevents mis-probing during tests. [Elektroda, grala1, post #16645130]

Where do I find the engine code, and does it affect fan diagnostics?

The letter code, like 9HY or 9HZ, is embedded in the VIN. It helps select exact wiring and pin references when models share power outputs but differ in harnessing. [Elektroda, grala1, post #16645130]

Does replacing the fan resistor always fix P0694?

No. In the case discussed, replacing the fan resistor/module did not restore low speed. The ultimate fix was ECU replacement after wiring verified good. Avoid parts darts; test first. [Elektroda, piotrek333, post #17239076]
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