Date: Fri, 07 Sep 2001 14:52:39 GMT
From: "KeithG" <noonenopsaml.com>
Subject: Re: 1986 900S Fuel Pump Relay? Where is it?


LH ECU is the fuel injection computer. On your car is it a Bosch LH 2.2 (Luft Hitzdraht) electronic control unit Make sure that it is working correctly. There should be 12V on the socket hole for the tab #30 (at all times). Try shorting with a short piece of wire between 30 and 87B of the fuel pump relay. IIRC, the fuel pump relay has a connection to 87B (not 87A) and the LH ecu relay has a connection to 87A and not 87B. If you are able to get it to run with this jumper, it may be the LH ecu which is at fault. Also you could verify if there is continuity from the relay 87B to the fuse and then from the fuse to the fuel pump. The fuse-fuel pump link can be verified with a jumper to 12V. If the pump runs, it is either the LH ecu or one of the other wires is not making good connection. On the outside chance, check to make sure that the ground on the head is good and clean and ALL of the wires are connected to ground. The link will give a bit more information. Regards, KeithG http://216.78.172.244/engine_folder/nostart22.htm http://216.78.172.244/electrical_system_folder/lh22wiringdocs.htm "GuitarMan" <someonenopsamosoft.com> wrote in message news:tpg5577kf0u123nopsam.supernews.com... > Ok, I found it and there are only 2 relays there both are the same exact > kind so I tried switching one at a time and it's still a no-go (it doesn't > require 2 does it?). I'm running out of ideas here as the fuse itself is > good, the pump does run and start the car if I conncect it directly to the > battery. I'm thinking about hooking up a direct line with a toggle switch > just to get it running if I have to... :-) any other ideas? > Thanks... > > "KeithG" <noonenopsaml.com> wrote in message > news:T4Kl7.46318$Iq4.21787404nopsamoon.columbus.rr.com... > > Are you sure that the fuel pump relay is in the fuse box? I thought it was > > right adjacent to the LH ecu under the RHS carpet (under the dash). That > is > > where mine is for the '89 and '92's. > > > > KeithG > > "GuitarMan" <someonenopsamosoft.com> wrote in message > > news:tpde1u3gu5k449nopsam.supernews.com... > > > I did a direct connect from the battery to the > > > fuel pump and it does start and run. The fuel pump relay on this thing > is > > a > > > little confusing as the mechanics book says that the relay goes into > slot > > > "G" but the fuse/relay case cover says that "G" is for the fog lamps (I > > did > > > put a relay in that slot and I get nothing)? Thing is, there are no fog > > > lamps on this car and I'm not sure why it's labeled this way??? I > checked > > > the fuse and it's not blown. Anyone else know where a fuel pump relay > > would > > > go besides in the fuse compartment? > > > Thanks... > > > 1986 Saab 900S > > > 4 Cyl. 16 Valve > > > > > > > > > > > >

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