Hi all,

I recently Bought a ~113K Miles 1998 CRV AWD EX A/T with a check engine light on (don't kill me please), ordered an OBD2 scanner and plugged it in and it returned a P1107 "Barometric Pressure (BARO) Sensor Circuit Low Voltage" code, according to the Factory Service Manual if doing the ECM/PCM reset procedure (which I did) doesn't take away the code the only other option is to replace the ECM altogether since the "BARO" sensor is actually inside the ECM circuitry.

I'm planning on doing a M/T swap on the thing which will require me to replace the ECM anyway, however, I figured it could be caused by something else so I kept digging online and found that this code can also pop up for a faulty MAP Sensor, vacuum leaks, clogged catalyc, etc. so I started by checking/cleaning the MAP sensor after watching a video on youtube of a guy doing it on a 98 civic to fix what seemed to be this same problem, however in my case I found that the MAP sensor appears to be working properly and the MIL is still on.

I'm new to the whole car mechanics world let alone hondas (this is my first honda and my second car overall) and I don't have the tools or the required equipment to embark in more complicated troubleshooting, I just have a miltimeter, a screwdrivers set and the OBD2 scanner, so before I go on trying to do anything else I wanted to check if you gurus have any recommendations. should I just wait and hope that code goes off when I swap the ECM during the M/T swap, or is this deffinitely caused by something other than a faulty ECM, below is the freeze frame data I got for said code on the scanner, I looked up what each reading means but I don't know what to compare these values against or how to interpret them so I'd appreciate if you can tell me if it points out to a specific issue other than a bad ECM.

DTCFRZF = P1107
FUELSYS1 = OL
FUELSYS2 = --
LOAD_PCT(%) = 32.9
ECT(°C) = 37
SHRTFT1(%) = 0.0
LONGFT1(%) = 0.0
MAP(kPA) = 33.0
RPM(rpm) = 1171
VSS(km/h) = 0
IAT(°C) = 38
TP(%) = 9.8

Other than this code, the car runs fine engine wise, it doesnt seem to be lacking power or misfiring, although revs are higher than normal during cold start (1.0 - 1.3K). I tried adjusting the revs through the screw on the intake manifold (I probably shouldnt have) and screwing it all the way still keeps revs above 1k. I guess is also worth mentioning that I did an oil and air filter change when I bought it (less than a month ago) and plan to do an engine overhaul in the near future, also I live in the Dominican Republic (tropical mostly hot weather) and tools here are more expensive than in the US, paying a mechanic to do whatever job is required ends up being cheaper than buying the tools and equipment and doing it yourself.

I appreciate any help you can give me.

 

After digging a little deeper found out that the "FUELSYS1" parameter operating value should be "closed" (CL) at idle speed, however the RPM (rpm) value at the time of the failure was 1171 which is higher than what the idle RPM should be (750+/-50RPM) which might explain the OL reading. I guess I gotta correct the fast idle issue and go from there so will try that while waiting on someone to reply.

 

ECT wasn't high enough for closed loop operation.

 

Thanks for your reply, I didn't know there was a relation between ECT and FUELSYS1, so I guess the OL output was normal under this conditions huh