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SUVs Chevrolet Blazer Chevy Blazer Oil Pressure problem
17 messages, Last post on Nov 05, 2009 at 2:19 AM
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AC suddenly went completely dead. Found 25 A fuse open. Checked blower, clutch etc for shorts. AOK so replaced the fuse. Worked perfectly for about ten minutes and again went dead. Opened control circuit at pressure SW, clutch and control relay to isolate the wiring . Found 2 ohm to ground on wire leading to ECM. Now, if I could only find the ECM, might be able to fix it. Chilton said, " If it's not in the engine compartment then it might be behind the glove box or some place under the dash or behind the kick plate". Easter egg? The truck looks like it had been parked over night in a ghetto and I still can't find the ECU. Can any one be a little more specific as to where I might find the ECU? Can any one explain why the AC control even goes through the ECU? I prefer to replace the ECU, if necessary, but what would happen if I bypassed it and went directly to the clutch? Thanks 
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Replying to: rfletcher (Aug 05, 2009 11:37 am) Never mind, I found the ECU /ECM. It was not the problem but by tracing the grounded wire back, found the problem in a connector that does not show in the manual. All systems are now GO. For any one interested, the ECU / ECM is installed [ hidden ] behind the glove box. In this model the box appears to be a rigid part of the entire dash. Below the dash there is a shelf that runs from the passenger side kick panel just beyond the 4X4 shift lever. Even with all the screws out, it is difficult to remove. The kick panel comes out easily. A single screw, now visible, secures the mounting bracket. With that screw out, the entire unit slides down from it's hiding place. The cable harness is rather short and tangled so a little care should be taken. I had to remove the two small plugs on the inboard side before it was free. Thanks
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Replying to: rfletcher (Aug 05, 2009 6:50 pm) What did you find that was blowing the fuse?
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Replying to: jlflemmons (Aug 05, 2009 8:21 pm) This sort of issue came up in a general discussion page elsewhere on this site. The question was, why are there never problems, in this forum, with the ECM. As I remember, the opinion was that the trouble is almost always in the peripheral circuit and the ECM is so well hidden that a stupid mechanic, such as myself, can't damage it. Well, I tried really hard. Thanks
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Replying to: rfletcher (Aug 06, 2009 7:42 am) Regarding ECM failure, they are very rare. As any failure can cripple the car, a lot of attention is paid to these, and typically they are built using MIL-SPEC parts. Higher temp ratings, greater voltage tolerance, etc. The second generation S series ECM has a heat sink mounted to it. I have been told that many of the ECM that are replaced will test good. Either a harness problem, or bad contact in the mating connector. In a manufacturing environment, these are very easy to test and confirm good before installation.
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Replying to: jlflemmons (Aug 06, 2009 8:47 am) I need to correct myself on accessing the ECM. It was not the shelf under the dash but the kick panel below that was removed. Still a miserable job, out and back in. Also, the other wire in the connector was not circuit ground. Still more reason to look further down the line. Intermittent problems can make you crazy. |
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I have a 99 blazer the gas gauge doesnt read right {just what ever it wants to).`Oil gauge reads according to rpms, speedometer moves up some while in park as to rpms. Is the a bad ground?
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recently when i start the engine i hear a slight ticking noise from the engine,and the oil pressure climbs to  60, (it is normally40) /after a few miles the pressure will return to normal / speculation is perhaps the oil pump is bad, or i should try a different viscosity oil perhaps 5w/30 / anyway this is a baffling problem, do you have any suggestions, thanks
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Replying to: odaat (Oct 03, 2009 12:13 am) How many miles on the engine? |
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Replying to: allen30 (Aug 16, 2009 9:43 am) Did you find out what your problem was? Her also seem to just stop for no reason. It will stumble and die. A day later it's fine again like nothing has happened. It seam to come and go. Sometimes she can only drive for like 5min before it start to stumble and want to die. Others it will be fine for a week. |
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