3 replies to this topic

[3basecharlie]

My check engine light came on today on my 1990 240 wagon with 245,000miles I 've had since new...first time this has ever happened, is there a way to check the codes without going to a mechanic, it seems to me that I've heard that there is??????

[Three Fat Tigers]

http://www.brickboar...ineOBDCodes.htm
It's real easy to do.

[3basecharlie]

Frist I must say checking the codes was a snap, it should be that easy for all cars, thanks for the lead
I did pull a couple of codes I thought maybe you could help me with
1) 2-3-2
Fuel trim to lean or to rich @idle
2) 1-4-4
no load signal from fuel ignition system
-bad fuel injection relay
-faulty wiring from LH to EZK
-bad LH module

where do I find the relay and module

Thanks for any guidance on this

[Three Fat Tigers]

Did you find any codes in test socket 6?

The fuel injection relay (aka fuel pump relay) is us up under the dash above the passenger footwell, normally clipped on the front of the EZ-116K ignition control unit(aka ICU) which is against the firewall, upper right corner. The LH module mentioned is the Bosch LH2.4 Engine fuel control unit (aka ECU), located forward of the passenger door behind the kick panel. I'd start by pulling the connectors for both the ICU and ECU and look over the connectors for any signs of corrosion contamination (note this will reset any stored ODB1 codes). Try another fuel pump relay.

Some of the early LH2.4 ECUs were troublesome, if replacing, I'd recommend trying to find one from a '92+ 940 (non Turbo, non Regina), you should see better power and economy.