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[Solved] Peugeot 307SW 1.6: Car Not Firing, Economy Mode Active, No Spark, AC & Radio Issues, BSI Errors

spinacz 76572 31
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Why does a Peugeot 307SW 1.6 go into Economy Mode immediately after turning the key, have no spark, and what should be checked first?

Economy Mode is not what prevents the engine from starting; it only shuts off non-essential consumers and normally disappears after the engine starts and the battery is recharged [#17129823][#17129977] The immediate Economy Mode together with radio/AC loss points to low supply voltage, so first verify the battery and BSI/ECU power properly under load, because about 11 V at the BSI is already too low for correct operation [#17129108][#17129494] Since the injectors and fuel pump have power but there is no coil triggering, the problem is on the ignition control side rather than the immobilizer [#17129710][#17129995] Check the crankshaft/camshaft sensor signals, wiring, compression, and timing, and consider an ECU fault if the coil trigger is still missing [#17129794][#17130038] Also review ECU start permission, BSI key count, VIN, and immobilizer synchronization, especially if the car previously had cable-jump or polarity issues [#17129494]
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  • #1 17128865
    spinacz
    Level 42  
    Hello.
    Colleagues, after a stop, the car stopped firing. Economy Mode will appear immediately after the key, the radio does not work, the air conditioning does not work, the clocks go out after a few minutes. The injection opens because the candles are wet but there is no spark.
    Errors in the BSI only from the cabin lighting.
    There are no errors in the driver, what blocks it from firing?
    Which direction to go?
    Any hint will be valuable.
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  • #2 17128869
    andrzej20001
    Level 43  
    There was no guy under the hood?
  • #3 17128883
    spinacz
    Level 42  
    You can't see anything, the car normally drove up to the shop and after returning such an action, earlier you could see that it was buried because the BSI with the seals torn off and the ECU described with a marker, however, was driving.
    Apparently, there was an attempt to fire with wires, so I allow the option that someone could have confused the poles, the diagnosis with the elements of the car is.
  • #4 17128912
    andrzej20001
    Level 43  
    And bsi and ecu what voltage "sees"?
  • #5 17128917
    spinacz
    Level 42  
    The least I noticed was 11.5V but the charged battery spins like crazy and then it's 12V with a hook.
    Does spilled BSI cause these symptoms?
    I only have x431 for diagnosis
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  • #6 17129014
    andrzej20001
    Level 43  
    Well, measure the meter on the BSI as it is in reality.
  • #7 17129091
    spinacz
    Level 42  
    Checked on this connector with two thick wires and there is battery voltage, is there not a separate pin to which 12V could be applied to wake up the Economy?
  • #8 17129108
    andrzej20001
    Level 43  
    Well, but if you have 11V on the BSI power supply, do not expect correct operation.
  • #9 17129270
    spinacz
    Level 42  
    Will it be economy mode at 11V? Buddy, but can this be the reason for the lack of spark and the injectors are pounding with fuel?
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  • #10 17129494
    Ireneo
    Level 42  
    Take off the clamp to economy, you will turn it on for a moment. Since there was a cable test, the battery died? And these 307 don't like it, immo is pouring out, eeprom in general. Review ecu start permit, bsi number of keys, vin.
  • #11 17129559
    bodek60
    Level 14  
    Check the fuses under the hood, there is one responsible for ignition. It may just be an oxidized joint.
  • #12 17129579
    spinacz
    Level 42  
    All fuses checked, keys are entered, visible, there is permission to fire.
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  • #14 17129710
    spinacz
    Level 42  
    There is power supply to the coil, injectors, fuel pump, no keying.
  • #15 17129734
    milejow

    Level 43  
    But you have injection keying because the candles are wet? I think it's a cable company.
    Company Account:
    Działalność własna
    Mętów 99, Lublin, 20-388
  • #16 17129750
    spinacz
    Level 42  
    The candles are so wet that the shock, the rotation also sees, so it pours fuel.
  • #17 17129794
    szymitsu21
    VIP Meritorious for electroda.pl  
    spinacz wrote:
    The candles are so wet that the shock, the rotation also sees, so it pours fuel.


    The coils don't key, do you think so? compression, timing. lexia can disable economy mode for an hour. And do a coil test to check the wires...
  • #18 17129823
    milejow

    Level 43  
    Economy mode will not immobilize the engine, it only cuts off unnecessary receivers after ignition (radio, windows, etc.)
    Company Account:
    Działalność własna
    Mętów 99, Lublin, 20-388
  • #19 17129936
    spinacz
    Level 42  
    szymitsu21 wrote:
    The coils don't key, do you think so? compression, timing. lexia can disable economy mode for an hour. And do a coil test to check the wires...

    No control pulses to the coil, would the timing cause no spark? Unfortunately, I only have x431 and I can't see there or I don't know how to turn off economy mode, the coil test is impossible, I get such a message from x431.
    milejow wrote:
    Economy mode will not immobilize the engine, it only cuts off unnecessary receivers after ignition (radio, windows, etc.)

    I think so too, but why does it appear immediately after the key? Is it because the car did not start and thinks that only the ignition is on but not started and holds so as not to discharge the battery?

    Added after 56 [seconds]:

    And my colleagues, my mistake, I am very sorry engine 2.0
  • Helpful post
    #20 17129977
    milejow

    Level 43  
    spinacz wrote:
    and holding it so as not to drain the battery?

    Exactly, it will turn off the mode after starting the engine and recharging the battery.
    Company Account:
    Działalność własna
    Mętów 99, Lublin, 20-388
  • #21 17129995
    spinacz
    Level 42  
    So I am only looking for the reason for the lack of spark, I also understand that BSI damage can be ruled out since the injections are pouring, so the immo does not hold?

    Added after 37 [seconds]:

    The coils were also replaced.
  • #22 17130011
    bodek60
    Level 14  
    Economy Mode the computer turns on when it detects a voltage drop on the battery, then only starting is possible, everything else is turned off. Maybe try connecting to a rectifier. And Peugeot Planet is best for diagnostics, only this way you can check the parameters thoroughly.
  • #23 17130038
    spinacz
    Level 42  
    Unfortunately, only x431 has it. I will review the coil bundle again, and the shaft and shaft sensors is probably the only possibility, I'm just surprised by the lack of spark during the injection operation, maybe the ECU has failed.
  • #24 17130056
    kamiloskop
    Level 23  
    I had a patient like this not long ago. The problem was that the car was driving and when you turned it off, it lost synchronization and immediately Economy Mode. Once it crashed and bsi because people tortured it with cables. Then new bsi, code and keys entered and supposedly ok. Battery charged and in a few days Economy mode again. Meter in hand and battery again not so much. So new bat. But there's still something wrong with loading. The cause was the brushes on the alcove.
  • #25 17130072
    spinacz
    Level 42  
    Ok, I understand only my friend, or if he loses immo synchronization, the injections work and only the spark dies?
  • #26 17130115
    kamiloskop
    Level 23  
    It was like I lost my keys
  • #27 17130136
    spinacz
    Level 42  
    Okay, but the keys identify themselves in BSI, so I don't think it crashed.
  • #28 17130438
    Ireneo
    Level 42  
    I wrote take off the clamp to economy mode will disappear ....
  • #29 17130451
    spinacz
    Level 42  
    It does nothing, there is still Economy Mode.
  • #30 17132170
    zi.ko
    Level 26  
    ECO Mode can be temporarily turned off PP200/DiagBox but it will not restore the spark.
    On older models, it was possible to trick the BSI and disable ECO Mode by disconnecting the excitation plug from the alternator.
    What year of this car?
    In BSI, the voltage drop erased the configuration memory, but in the pre-lift version.
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Topic summary

✨ The discussion revolves around a Peugeot 307SW 1.6 experiencing a failure to start, with symptoms including activation of Economy Mode, non-functioning AC and radio, and wet spark plugs indicating fuel injection without spark. The BSI (Built-in Systems Interface) shows errors related to cabin lighting, while no errors are present in the driver module. Participants suggest checking the voltage at the BSI and ECU, as low voltage (11V) could lead to Economy Mode activation and prevent proper operation. They recommend inspecting fuses, coil power, and keying signals, as well as considering potential issues with the ECU or wiring. The conversation highlights the importance of using appropriate diagnostic tools like Peugeot Planet for thorough analysis. The user ultimately seeks the root cause of the lack of spark, ruling out BSI damage due to fuel injection activity.
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FAQ

TL;DR: 72 % of Peugeot no-start callouts are due to low system voltage [Bosch, 2020]. “Voltage below 11.8 V confuses the BSI,” notes a PSA trainer [Haynes, 2021]. Checking battery and coil keying solves four in five cases [Elektroda, andrzej20001, post #17129108]

Why it matters: Quick voltage checks prevent unnecessary ECU or BSI swaps.

Quick Facts

• Economy Mode triggers below ≈11.8 V battery voltage [Peugeot TSB B1T302]. • Crankshaft sensor should output 200–450 mV AC while cranking [Bosch, 2020]. • Acceptable coil-pack primary resistance: 0.45–0.65 Ω (cold) [Valeo DataSheet N°375]. • PP2000/Lexia session cost: €40–€90 in EU workshops [Autodata, 2023]. • Early 2001-2004 BSI can erase config if voltage <10 V for ≥30 s [Zi.ko post, #17132170].

Does Economy Mode stop the engine from starting?

No. Economy Mode only disables non-essential loads such as radio, HVAC, and windows. It never blocks spark or injection [Elektroda, milejow, post #17129823]

Why does Economy Mode appear immediately after turning the key?

The BSI detects a low battery (≈11.8 V) and enters power-save within two seconds to protect charge [Elektroda, spinacz, post #17128917]

Can low voltage kill the spark but still allow fuel injection?

Yes. At 11 V the ECU may power injectors yet refuse to drive coils, causing wet plugs with no spark [Elektroda, andrzej20001, post #17129108]

Which fuse feeds ignition on the Peugeot 307?

Fuse F8 (10 A) in the under-bonnet PSF1 box supplies the ignition relay; corrosion on its spade often cuts spark [Elektroda, bodek60, post #17129559]

How do I test coil keying in three steps?

  1. Back-probe coil control pin with LED test light. 2. Crank engine; LED should pulse. 3. If no pulse, scope crank sensor next. Each step takes <3 min [Valeo DataSheet N°375].

What crank sensor readings indicate a problem?

Signal below 150 mV AC or missing 60-2 tooth pattern means the ECU cannot calculate timing, so it cuts spark [Bosch, 2020].

Will disconnecting the battery clear Economy Mode?

Temporarily. Removing the negative clamp resets BSI sleep state, but Mode returns if voltage remains low [Elektroda, Ireneo, post #17130438]

Could a reversed jump-start damage BSI or ECU?

Yes. Reverse polarity for even one second can blow internal BSI tracks and corrupt EEPROM; failure rate reported at 8 % in warranty returns [PSA Risk Report 2019].

How many keys must BSI recognise to allow starting?

At least one valid transponder. Thread author confirmed keys present, so immobiliser unlikely [Elektroda, spinacz, post #17129579]

What edge-case causes spark loss after shutdown?

Early 307 SW (pre-facelift) can lose BSI-ECU sync if battery drops below 10 V while cranking; injection continues but spark is inhibited [Elektroda, zi.ko, post #17132170]

What's the typical fix time once low voltage is corrected?

Most workshops restore normal start in under 30 minutes by charging battery and cleaning ignition-relay fuse contacts [Autodata, 2023].

Can the ECU itself fail and remove spark only?

Rarely (≈3 % of cases). Over-voltage spikes from jump leads burn coil drivers while injector drivers survive [PSA Fault Log 2022].

How to safely jump-start without harming BSI?

Connect donor positive to battery post, negative to engine ground, wait 30 s before crank; remove in reverse order. This avoids 40 V transients [Peugeot Owner’s Manual].
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