How do I test my Electronic Control Unit/ECA?
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From: South JAX FL
How do I test my Electronic Control Unit/ECA?
Chilton's suggests EEC code 89 may mean "ECA problems" about a dozen times and even has electronic control unit in the gossary. But no where do they mention where it is, how to test it or anything about it.
How do I test the ECA down by the glove box on my 87 BII?
I got the 89 code right after replacing the EGR valve assy to clear an 83 code.
How do I test the ECA down by the glove box on my 87 BII?
I got the 89 code right after replacing the EGR valve assy to clear an 83 code.
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From: South JAX FL
PS. I have a code checker that I got from ACTRON. What I need is a way to troubleshoot the ECA itself. Or do I just accept the 89 code and head to the friendly neighborhood parts store?
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From: UT
1st thing: If Chilton's 1st diagnostic step is to check the ECA, then I would close the Chiltons and find a different repair manual for diagnosing this. A bad ECA is one possibility, but it is the last possibility I would consider.
Is that 89 a KOEO code (before the separator pulse) or a CM code? I would expect it's a KOEO code, but want to be sure.
My code list indicates that, where an A4LD is involved an 89 indicates a problem in the Converter clutch override (CCO) solenoid circuit. My experience indicates that the computer isn't very sensitive at detecting faults in this circuit. It's either caused by a full open in the circuit or a short to ground. So the first step is to grab a wiring diagram and a multimeter and test the circuit.
Is that 89 a KOEO code (before the separator pulse) or a CM code? I would expect it's a KOEO code, but want to be sure.
My code list indicates that, where an A4LD is involved an 89 indicates a problem in the Converter clutch override (CCO) solenoid circuit. My experience indicates that the computer isn't very sensitive at detecting faults in this circuit. It's either caused by a full open in the circuit or a short to ground. So the first step is to grab a wiring diagram and a multimeter and test the circuit.
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From: South JAX FL
89 is a KOEO code.
1. Would CCO problem make the engine run rough and really REALLY idle poorly/barely?
2. Once again, Mr Chilton is a bit vague in telling me where to look for the CCO solenoid. Suggestions on location?
1. Would CCO problem make the engine run rough and really REALLY idle poorly/barely?
2. Once again, Mr Chilton is a bit vague in telling me where to look for the CCO solenoid. Suggestions on location?
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From: UT
The Converter clutch is the mechanism in the torque converter that locks up at highway speed to improve gas mileage for an auto tranny. The solenoid itself will be in the valve body of the transmission. The connector is on the drivers side of the transmission.
An electrical problem in the CCO circuit may or may not contribute to your idle problems. Off the top of my head, I'd say it isn't likely, but not impossible. As I noted, it should be a fairly simple fault to track down with a wiring diagram and a multimeter, so I would probably start there.
An electrical problem in the CCO circuit may or may not contribute to your idle problems. Off the top of my head, I'd say it isn't likely, but not impossible. As I noted, it should be a fairly simple fault to track down with a wiring diagram and a multimeter, so I would probably start there.
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My code reader book says a code 89 can be:
A4LD - Converter Clutch Override solenoid - Transmissions
AXOD Torque Converter Control solenoid circuit - Transmissions
Exhaust Heat Control (heat riser) solenoid circuit - Solenoids
An Internet site I use also says the same thing...
Since you just replaced the EGR, I would be looking at the 3rd callout..
Exhaust Heat Control (heat riser) solenoid circuit - Solenoids
McQue
A4LD - Converter Clutch Override solenoid - Transmissions
AXOD Torque Converter Control solenoid circuit - Transmissions
Exhaust Heat Control (heat riser) solenoid circuit - Solenoids
An Internet site I use also says the same thing...
Since you just replaced the EGR, I would be looking at the 3rd callout..
Exhaust Heat Control (heat riser) solenoid circuit - Solenoids
McQue
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From: South JAX FL
I cannot seem to find an exhaust heat control solenoid either in the manual or at any parts supply site (NAPA, etc.) Where might this elusive gizmochy be located?
LTB
PS It idles barely after you sort of force it to stay running for about five minutes.
LTB
PS It idles barely after you sort of force it to stay running for about five minutes.
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don't know if your vehicle has one but...visit this site...it will help you locate it if you do have one...good generic picture and description...
http://www.motorera.com/dictionary/EX.HTM
http://www.motorera.com/dictionary/EX.HTM
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From: SoCal
The lousy idle sounds like a vacuum leak.
Since this all started with an 83 code, are you sure that shiny new EGR valve is closing at idle?
If not thats a major vacuum leak.
I believe the vac hose with the rubber boot is the one that opens the EGR. Try removing it. Does the idle improve?
BTW, I took a quick look at the engine controls wiring diagram in my 87 EVTM & theres no mention of a "heat riser solenoid circuit".
I think heat riser valves went away when carbs did.
Since this all started with an 83 code, are you sure that shiny new EGR valve is closing at idle?
If not thats a major vacuum leak.
I believe the vac hose with the rubber boot is the one that opens the EGR. Try removing it. Does the idle improve?
BTW, I took a quick look at the engine controls wiring diagram in my 87 EVTM & theres no mention of a "heat riser solenoid circuit".
I think heat riser valves went away when carbs did.
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From: South JAX FL
I'll get on the vac leak look around this afternoon. Thanks.
When I removed the old EGR I noticed a good deal of greaselike goo in the opening. I cleaned out as much as I could reach with a narrow dental tool. Would it do any damage if i was to blast a shot or two of something like compressed air or carb cleaner back up that tube to clean it out a bit better? I.e. where does the EGR get it's input from?
When I removed the old EGR I noticed a good deal of greaselike goo in the opening. I cleaned out as much as I could reach with a narrow dental tool. Would it do any damage if i was to blast a shot or two of something like compressed air or carb cleaner back up that tube to clean it out a bit better? I.e. where does the EGR get it's input from?
Post Fiend
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From: Atlanta GA
> I cannot seem to find an exhaust heat control solenoid
I would take that to be the cannister on the exhaust manifold that recirculates heat to the air cleaner duct. Been a while since I had my 1984, which I think had one.
I would take that to be the cannister on the exhaust manifold that recirculates heat to the air cleaner duct. Been a while since I had my 1984, which I think had one.
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