1991 Volvo 240 Throttle Swich Signal?

  #1  
Old 06-05-2011, 03:17 PM
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Default 1991 Volvo 240 Throttle Switch Signal?

Hello All, I am search of help to 2 issues. Volvo 240 automatic, has been stalling, so I made it junk yard today and picked up 2 throttle sensors and 2 MAF's. On my way home car stalls as usual, and would normally start back up. But today, it has refused to start, it cranks pretty strong. OBD gives 113 and 133 (throttle switch signal?). Check engine light is on but came on very shortly after O2 sensor was replaced -- which was in 4 days after being replaced (this was 2 weeks ago today) at that time codes given were 113 and 232. If anyone has recommendations and advice please help.
 

Last edited by Patznu; 06-06-2011 at 04:52 PM.
  #2  
Old 06-05-2011, 10:12 PM
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Time to break out the multi-tester. That first code was for the fuel injectors; maybe the radio suppression relay has gone out. Really don't see a TPS causing a no start condition. Other suspects? Crank sensor (failure often begins at low speed idles), ignition power stage occasionally.
 
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Old 06-06-2011, 01:18 PM
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where is this suppression relay located? I do not see a relay near coolant resevoir.
 
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Old 06-06-2011, 02:19 PM
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None of the 240's have radio suppression relays. You should pull fuse 6 to clear the fuel ECU codes after making any changes, also make sure the fuse contacts are clean.
 
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Old 06-06-2011, 04:21 PM
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Ok Located it.. For all that run across this Similar issue The relay is on opposite side of Coolant reservoir and is called an A/C relay from the indie and etc. It seems Volvo incorporated this Radio suppression and a/c relay together. But after changing .. Nothing has changed my situation. Strong Crank... no turnover. Same Codes given (113 + 133) This A/C-Radio suppression relay and Fuel pump relay replaced moments ago.... Does anyone think I should change this VSS/crank postion sensor ? Its cranking pretty strong and out of leads. Now I will try to pull Fuse #6 as suggested .. that is a first for me to hear of that. Thanks All so far for the advice!!
 
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Old 06-06-2011, 05:55 PM
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240's do not have the 'radio suppression relay'. that combined relay is the fuel injection and a/c relays combined, I believe. the fuel injection relay basically turns on the ECU and stuff, while the 740/940-only radio supression relay fires the injectors because the ECU was moved to be too close to the radios on these cars, creating too much radio interference.
 
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Old 06-11-2011, 09:53 PM
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Update is that there is no spark mechanic said, code still coming up 113,133 he has told me there are 3 reasons that came to his mind. Crank position sensor, Ignition coil or Ignition module. Any other suggestions...?
 
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Old 06-11-2011, 10:37 PM
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Well, the guys are quite right about 240's not having an rsr...I beg confusion as a. my 740's rsr has failed and 2. my 240 wiring currently is a bit of a mess
Simple enough to swap in a new coil but my experience has been they die incrementally, not intermittently. As for the other 2 items, I agree...in fact I mentioned 'em in post #2.
 
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Old 06-12-2011, 09:24 AM
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Not a dispute .. Just the info I gather to understand what is related to my problem. Thanks for any HELP that can be provided.


The radio suppression relay (as it's called) is in actually a fuel injector relay. The pre 1986 injectors were supplied constant + power to one terminal and supplied a timed ground to the other terminal via the ECM. The constant + power used to come from the fuel pump/injection system relay. In 1986 Volvo decided to isolate the fuel injector circuit because of some radio interference created by the pulsing circuit. The solution was to energize a relay (the radio suppression relay) with the pump/system relay feed instead of using it to power the injectors directly. The radio suppression relay then supplies the + power to the injectors. The timed ground still comes from the ECM. This radio suppression relay is located on the driver side of the engine compartment behind the power steering reservoir. For the most part the non-turbo engines had the radio suppression relay mounted on the right side (pass) of the engine compartment on or near the coolant reservoir . The turbo engines had the radio suppression relay mounted on the left side (drivers) of the engine compartment on or near the shock tower. Not set in stone just as a general rule. The radio suppression relay was used from 1986 until 1995 on almost all LH injected 4 cyl and V6 engines. There may be a couple of exceptions. The 5cyl and straight 6cyl engines do not use one. When it's bad or missing, the radio will work fine, but the engine will not run. Remember even though it's called a radio suppression relay it's function is to supply + power to the fuel injectors.
 
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