BMW ISTA

How to Solve BMW F25 F26 Engine Intermittently No-Start at Very Low Outside Temperatures?

Posted on by SmartBimmer

How to solve BMW F25 F26 Engine Intermittently No-Start at Very Low Outside Temperatures?

BMW F25 F26 Engine Intermittently No-Start at Very Low Outside TemperaturesBMW Software requested:

  • BMW ICOM Software Version: V2020.05
  • ISTA-D: 4.22.32,with SDP Programming Database 4.22.32
  • ISTA-P: 3.67.1.006 with Engineer Programming, supports the programming of BMW motorcycles and electric vehicles and can program F/G/I/K chassis for the car (through the BMW ICOM, not other cables)
  • Vin: V2020.2.15
  • BMW ETK: 2020.01
  • BMW KSD: 2020.01 Multilanguage
  • BMW FSC Navigation Code Generator
  • BMWAiCoder for BMW Coding

BMW ICOM A2, NEXT A+B+B+C V2020.05:

  1. Get engineer version, INPA 5.00, Winkfp 5.2.3, NCS 3.5.1, E-sys 3.30, data V67.0. get Chinese software DR.GINI B020
  2. Get count code navigation tool software FSC operator code
  3. Get one-click hidden brush tool BMWAi V4.6
  4. Add DIS Software for Old cars, DISV57 and DISV44, diagnosis, and programming for BMW virtual machines.

BMW engine will not start at times at very low outside temperatures (-4°F/-20°C and colder); however, the battery state of charge is correct and the starter turns the engine over properly. This starting difficulty is most likely to occur after shutting the engine off briefly for 5 or 10 minutes, such as when refueling.

N20 engine:

  • 1B5202 – Terminal 15N_1: No voltage
  • 1B5302 – Terminal 15N_2: No voltage
  • 1B5402 – Terminal 15N_3: No voltage

N52T engine:

  • 1B5102 – Terminal 15N_3: line from CAS, electric: short circuit to earth
  • 1B5501 – Terminal 15N: No voltage
  • 1F0601 – Terminal 15N from CAS, switching delay: Switches too late

N55 engine:

  • 1B5202 – Terminal 15N_1: No voltage
  • 1B5302 – Terminal 15N_2: No voltage
  • 1B5402 – Terminal 15N_3: No voltage

In addition, other engine electronic power supply-related faults could be stored for components such as VANOS solenoids, camshaft sensors, engine oil pressure sensors, engine oil pressure control valves, engine oil level sensors, etc.

CAUSE

At very low outside temperatures, low levels of moisture present inside the power distribution module (PDM) can freeze the internal micro-relay contacts.

CORRECTION

F25 and F26

  • Replace the PDM module and install the cover (if not already present) with the plastic rivet.
  • Important: Follow the instructions in the attachment. This will help ensure that the power supply wiring does not contact the cover.

F15 and F16

  • Replace the PDM module and install the cover (if not already present) using the existing mounting screw.
  • Important: The replacement PDM module part number listed below is only to be used in the case of a failure at very low ambient temperatures, as described above.
  • All other repairs requiring a PDM replacement must be done using P/N 12 63 7 591 534 and/or as specified in ETK
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