@@ecuopelrepair So I have this issue with my Opel Astra-G (2002) with Z18XE motor / Siemens Simtec 17 ECU Intermittent P0220 Throttle Position Sensor-2 voltage high (should be 4.5 volts, but it shows 5 volts on throttle sensor-2 signal pin-D during fault (Fault can be reliably triggered by applying pressure to the side of the ECU harness connector otherwise "wiggle test". One possible cause is an intermittent break in continuity on the "ground" leg of the sensor potentiometer (sensor pin-H to ECU pin 58). With the ground "gone", the signal voltage would equal the +5 volt reference voltage. Normally I would suspect a fault solder joint at the connector attachment to the ECU printed circuit board but this Siemens ECU does not attach the connector to the PCB, rather the connector appears to be fully bonded to the metal case with welded (not soldered) wires between all connector terminals and the PCB. I have never seen this type of assembly in over 55 years of dissecting and engineering things electronic. Is anyone familiar with potential failure modes? A bad connection in the connector is another possibility but difficult to inspect because the harness-side and ECU-side connector pins are sealed and out of reach. My next step will be to test the "bad ground" hypothesis by grounding ECU pin 58 inside the ECU (after the connector) as well as continuity testing. If you have any suggestions for further diagnostic strategies I would be greatful!
@@dsson9614all 100% simtec 71 units have a problem with breaks in contacts that go from the connector to the ceramic board. First of all, short contacts at the place of ultrasonic welding of contacts with the board are subject to breakage. A break in contact appears when the engine warms up to operating temperature, and on a cold engine there are no errors and the engine runs smoothly. A break in contacts can only be determined mechanically: shake the contacts with a needle (if there is a break, the contact will move away from the welding site) or use a toothpick or tweezers as in the video (only for experienced users, because you need to feel the force of pressure so as not to overdo it and break the entire contact)
Sir, do you know which one of these pins are for Throattle position sensor 2?
M3, 26, 58 or M10, 20, 42 (s1+s2)
@@ecuopelrepair
So I have this issue with my Opel Astra-G (2002) with Z18XE motor / Siemens Simtec 17 ECU
Intermittent P0220 Throttle Position Sensor-2 voltage high (should be 4.5 volts, but it shows 5 volts on throttle sensor-2 signal pin-D during fault (Fault can be reliably triggered by applying pressure to the side of the ECU harness connector otherwise "wiggle test".
One possible cause is an intermittent break in continuity on the "ground" leg of the sensor potentiometer (sensor pin-H to ECU pin 58). With the ground "gone", the signal voltage would equal the +5 volt reference voltage.
Normally I would suspect a fault solder joint at the connector attachment to the ECU printed circuit board but this Siemens ECU does not attach the connector to the PCB, rather the connector appears to be fully bonded to the metal case with welded (not soldered) wires between all connector terminals and the PCB. I have never seen this type of assembly in over 55 years of dissecting and engineering things electronic. Is anyone familiar with potential failure modes?
A bad connection in the connector is another possibility but difficult to inspect because the harness-side and ECU-side connector pins are sealed and out of reach.
My next step will be to test the "bad ground" hypothesis by grounding ECU pin 58 inside the ECU (after the connector) as well as continuity testing.
If you have any suggestions for further diagnostic strategies I would be greatful!
@@dsson9614all 100% simtec 71 units have a problem with breaks in contacts that go from the connector to the ceramic board. First of all, short contacts at the place of ultrasonic welding of contacts with the board are subject to breakage. A break in contact appears when the engine warms up to operating temperature, and on a cold engine there are no errors and the engine runs smoothly. A break in contacts can only be determined mechanically: shake the contacts with a needle (if there is a break, the contact will move away from the welding site) or use a toothpick or tweezers as in the video (only for experienced users, because you need to feel the force of pressure so as not to overdo it and break the entire contact)