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

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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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#31 17132201 27 Mar 2018 22:05

spinacz spinacz

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Post #31
17132201 27 Mar 2018 22:05

The customer must have changed his mind because he was supposed to deliver cars and silence.
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#32 17137411 30 Mar 2018 09:35

spinacz spinacz

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Post #32
17137411 30 Mar 2018 09:35

Thank you for your help, the car did not return to me, I do not know the further fate of the car.
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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?

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]

Which diagnostic tool can disable Economy Mode for testing?

PP2000/DiagBox offers a 60-minute override; X431 lacks this function [Elektroda, szymitsu21, post #17129794]

Is alternator failure linked to persistent Economy Mode?

Yes. Worn brushes reduce charge to 12.2 V max, keeping BSI in Economy even with new battery [Elektroda, kamiloskop, post #17130056]

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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