Date: Fri, 05 Sep 2003 21:06:10 +0300 From: Vesku <vtmNOSPAMnopsamoint.net.invalid> Subject: Bosch LH-Jetronic air mass sensor (Saab 9000)
Hotwire broken from the sensor that was working (A). I had another sensor unit (B), wires seem ok but did not work, with B no check engine light. Airmass sensor is Bosch type 0280212005, picture on http://www.speedparts.se/prod/res_fuel_luft.shtml I changed the two circuit boards that are under the black plastic cover, from A to B, thinking that there was something wrong in the electronics part of B, not in wires/resistors. I cut the 6 connections from side connector, 3 screws with screwdriver (and drill where needed), removed 6 solderings to the wires/resistors on the middle by suction. Thin wires locate quite easily if holes are clean. Finally soldered the side connector clips. But after changing, function remained same. So there is probably something wrong in wires/resistors of B as well, electronics could be ok in both. I also tried the sensor to a "reference car", it seems quite sure the fault is in airmass sensor, not ECU or some other sensor. According to Bentley's "Bosch Fuel Injection and Engine Management" book, the 6 wires soldered to PCB, are connected to resistor in frame (2 wires), hotwire (2 wires), temperature compensation resistor (2 wires). But there is no information about values et.c. What could be measured from the sensor disconnected / with power switched on / engine running ? And is there information, links, et.c. about Saab or some other Bosch LH airmass sensor (Audi, BMW, Volvo et.c..) schematics, or other info on the web ? br Vesku
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