How can I troubleshoot by lambda-sond system?
Date: Sun, 4 Jul 93 11:32:01 CDT From: barnett@mcc.com (Jim Barnett) To: swedishbricks@me.rochester.edu Subject: lambda sond test! I’ve spent the last couple of weekends checking out the lambda-sond system on my 80 240. I’ve used the Volvo problem solver from IPD and Bentley’s guide to Bosch FI, each of which gives a different set of tests. I’ve concluded that the computer is bad. I thought I’d pass along a description of the diagnostic tests in case anyone else had comments. Does anyone know where I could get a used FI computer for an 80? (New ones cost more than $400…) There are two ways to test the lambda-sond system – by testing the voltage from the O2 sensor and by testing the duty cycle of the frequency valve: Voltage Tests (from the Volvo problem solver): voltage from the sensor ranges from 0-1 volts, with values near 1 indicating a rich mixture and values near 0 indicating a lean mixture. Readings are valid only when the engine is fully warmed up. Voltage should be around .5v
