Trigger Wheel Problem
Posted: Thu Mar 30, 2017 9:39 am
I'm converting my T4 2270 engine to FI using Mario's MaxSFI ECU, sexy cam sync sensor and hidden trigger wheel (among other toys). The engine is installed and everything is finally buttoned up and am finally to testing these sensor while cranking, but I'm getting bad data.
I turn the key to engine on, make sure I have comms in TunerStudio, click "start" on the "Composite Logger" page, crank the starter for a few seconds, then click "stop" on the "Composite Logger" page, and see this: I tried a few more times and got nothing - no graph at all, then realized that the battery had low voltage and maybe it was cranking too slowly. I charged up the battery and tried again with the original result.
I disconnected the ECU and tested the Cam+ and Crank+ pins. Pulling that plug also pulls the grounds to those sensors. When I rotated the engine I saw 12v - 2v - 12v - 2v on Crank+ as the teeth moved past the sensor, and 2v - - - 12v - - - 2v as the engine rotated to every other TDC (12v when around the firing position for #1) on Cam+. I know it's supposed to drop to 0v, but I think it's because the ground wasn't connected for this test. I'll try again with it grounded, but I suspect it will be correct.
After talking with Mario for a bit, I guessed that my Cam+ and Crank+ pins might be swapped, so I triple-checked them to his diagrams (pinouts and connector)and they're correct. He suggested that I retry my tests with "Render Including non-interrupt Data" checked - I did and it didn't seem to change the result. Here's the log.
So, now what? Maybe the Cam+ and Crank+ pins actually swapped and the docs are wrong? Maybe I've got polarity reversed on the sensors and that's throwing something off? Maybe the Cam- and Crank- pins on the ECU have to be grounded? Something else?
Here's my wiring diagram, if that helps.
I turn the key to engine on, make sure I have comms in TunerStudio, click "start" on the "Composite Logger" page, crank the starter for a few seconds, then click "stop" on the "Composite Logger" page, and see this: I tried a few more times and got nothing - no graph at all, then realized that the battery had low voltage and maybe it was cranking too slowly. I charged up the battery and tried again with the original result.
I disconnected the ECU and tested the Cam+ and Crank+ pins. Pulling that plug also pulls the grounds to those sensors. When I rotated the engine I saw 12v - 2v - 12v - 2v on Crank+ as the teeth moved past the sensor, and 2v - - - 12v - - - 2v as the engine rotated to every other TDC (12v when around the firing position for #1) on Cam+. I know it's supposed to drop to 0v, but I think it's because the ground wasn't connected for this test. I'll try again with it grounded, but I suspect it will be correct.
After talking with Mario for a bit, I guessed that my Cam+ and Crank+ pins might be swapped, so I triple-checked them to his diagrams (pinouts and connector)and they're correct. He suggested that I retry my tests with "Render Including non-interrupt Data" checked - I did and it didn't seem to change the result. Here's the log.
So, now what? Maybe the Cam+ and Crank+ pins actually swapped and the docs are wrong? Maybe I've got polarity reversed on the sensors and that's throwing something off? Maybe the Cam- and Crank- pins on the ECU have to be grounded? Something else?
Here's my wiring diagram, if that helps.