Engine Opel 1,4 16V NA, 4 cyl, firing order 1342, without modifications (except exhaust, manifold, air filter)
Car using stock coils, stock injectors, stock electronic throttle body Bosch.
ECU SerialNr:15160
- Internal MAP 400kPa (planned conversion to turbo in future)
- appr +1.2V output in free air (103kPa ambient absolute pressure)
- ETC (with bridgeoutput interface)
PROBLEM:
Car was tuned a half year ago, run perfect, without problems, but since one day last week, customer had a problem with start.
After checking all data with PC, i found problem with internal MAP sensor.
MAP still show 5-10kPa even if the hose is disconnected from intake. I also try to make little over/under pressure with mouth, but MAP value did not change.
This is a screenshot of MAP value and MAP settings:
MAP sensor
is very easy to diagnose, even without disassembling, just remove endplate.
- Measure MAP sensor supply (between pin3=+5V and pin2=GND )
- MAP sensor output (pin1)
- Check the 1k protection resistor on the MAP sensor small PCB. Measure voltage on both sides. Is the voltage same ?
- maybe some trace or soldering ?
- the signal can be traced to the BAV99 protection and the AVR pin, see GenBoard/VerThree/Schematic
- this happens extremely rarely, sorry about the inconvenience. If you can fix it (yes, you can), please use order comment in next order: "please subtract 150 EUR from list price, self-repair 400kPa MAP signal oid..."