Still debugging the Subaru??2.5L Frankenmotor (2.2 heads) in an '87 GL Syncro. The numbers on the ECM are:
22611 AB414
JAI 18000 RT8
4910
My mechanic has rigged up an ODB II connector to the ECM and the Vanagon O2 LED is being used as the CEL.
The VIN of the Subaru donor car is 45(could be S)B3K655057324604
The CEL comes on after about twenty minutes of driving and I see P1101 -"?Neutral position switch circuit low" code on the reader. I've read through related posts on theSamba and here, and I'm confused. The documentation from my mechanic included a diagram titled 13. ENTINE ELECTRICAL SYSTEM - LHD. I've posted a copy here:
Not sure where the diagram came from, but I'd sure like to know where to get a complete copy as I was provided only a few of the pages. Anyway, the diagram shows the B84 plug to the ECM and B25 connector to the Neutral Position Switch (MT). On that diagram, Pin 78 is the Neutral Position Switch connection on the ECU, Pin 81 appears to be the START signal into the ECU, a R/Y wire. That lead comes from B105, Starter Interlock Relay (MT). I found a post from Tom Shields that suggested connecting the Neutral Position Switch and START terminals on the ECU together to produce a variable signal to simulate the real switch. I also found a Samba post that also references B84, but gives a different pin number for the Neutral Position Switch. So one question is, how do I determine what the pins are for the ECM I have, as they seem to vary widely over the life of the 2.2 and 2.5 Subaru engines?
My other question is that most of the posts I've read are several years old, and reported resolutions range from grounding the Neutral Position Switch ECM pin to rigging up a Hall effect device and magnet to the shift linkage to simulate the actual Subaru switch. The latter sounds like a lot of hoopla to go through, and?I'm wondering if there's been a consensus reached on what the best/easiest method is to resolve the P1101 error??
Thanks in advance...
