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missing engine rpm signal 200 87

posted by  someone claiming to be Neal on  Sat Jul 10 12:27 CST 1999 [RELATED]

I'm troubleshooting a problem on my 87 240DL. It's got a b230f w/auto trans, LH2.2 FI, and volvo/chrysler ignition. While going through the FI ecu tests, the Bentley manual says that with the ignition on, there should be 12V at pin 1. My meter shows about .04v. The connection to that pin is the "engine rpm signal". Following the schematics, I traced it back to pin 8 of the ignition ecu. I checked for continuity between pin 8 of the ignition ecu and pin 1 of the FI ecu and there is continuity. I also checked for 12v at pin 8 of the ignition ecu. No voltage there either. The car starts and runs, but after it warms up and has been idling a while, the car wants to die during acceleration, and when it finally does kick in, the acceleration surges.

So here's my questions:

1. Is the 12v really supposed to be there? I know that manuals can be wrong, and I'd really hate to be chasing my tail if this is a misprint.

2. Months ago while tracking down another problem, I disconnected the igntion ecu connector from the ecu. Today I read in the manual that you shouldn't disconnect the ignition ecu connector, and that if you do, you have to replace the ignition harness because of some "one time only" type of pins on that connector. Is this true? And if it is, who's the bonehead that thought that one up?

3. I was also checking the primary resistance of my coil. The manual states that it should be between 1.1 and 1.3 ohms. Mine reads 1.7. Is this too far out of spec?

Sorry for being so long winded, and thanks in advance for any help.





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