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Old 11-03-2013, 11:51 AM   #1
PSDFan
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Default Trouble codes..

Took the HCE out for a road test and I've gotten the following codes:

23 - IAT out of range

26 - Quad driver output fault

32 - EGR system fault

I take it that I should replace the IAT sensor and the EGR sensor that mounts to the valve cover but what is the Quad driver?
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Old 11-03-2013, 12:23 PM   #2
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Default Re: Trouble codes..

Code 32
Check the tightness of the female terminal grip with a spare male terminal.
EGR passages (cylinder head and intake manifold) restricted or blocked could also cause a Code 32.
EGR is ported vacuum. In a event the EGR solenoid fails you will still get EGR.

Get the IAT and EGR cleaned up before dealing with the quad driver as that is the PCM external device control system.

Test the EGR solenoid for opens and shorts and verify it will actually open and pass vacuum.

The IAT is out of range LOW which also guarantees the A/C is shutdown.
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Old 11-03-2013, 12:37 PM   #3
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Default Re: Trouble codes..

Quote:
Originally Posted by OldNuc View Post
Code 32
Check the tightness of the female terminal grip with a spare male terminal.
EGR passages (cylinder head and intake manifold) restricted or blocked could also cause a Code 32.
EGR is ported vacuum. In a event the EGR solenoid fails you will still get EGR.

Get the IAT and EGR cleaned up before dealing with the quad driver as that is the PCM external device control system.

Test the EGR solenoid for opens and shorts and verify it will actually open and pass vacuum.

The IAT is out of range LOW which also guarantees the A/C is shutdown.

Both the block and head were dipped and cleaned at the machine shop so I doubt any of the port are blocked.

The EGR valve appears to be actuated by a vacuum solenoid. I'll check that connection. I'll also pull a vacuum on the EGR valve itself. Be back soon.

Also neither odometer works although the speedometer and tach work. Any ideas there?
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Old 11-03-2013, 12:45 PM   #4
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Default Re: Trouble codes..

I checked the female connection the the EGR solenoid and it appears to be tight, the wire holder is seated.

The EGR valve itself won't hold a vacuum.

I'm not entirely positive that I have the correct vacuum line to the EGR solenoid but should that make a difference? I put the line on that was orientated halfway properly.
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Old 11-03-2013, 01:48 PM   #5
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Default Re: Trouble codes..

The EGR is ported vacuum. Just clean out the connecting tracts and fix the IAT. Take an ohmmeter to the solenoid and check for open and/or short. Apply 12v and verify the solenoid opens and you have flow through it.
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Old 11-03-2013, 01:52 PM   #6
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Default Re: Trouble codes..

Just took an @ 30 mile road test and used almost 1/4 tank of fuel. If the IAT sensor is out of range will the PCM revert to a preset fuel table? That figures to about 6 - 8 mpg!!! The engine runs smoothly and idles even. Will a newly rebuilt engine have a lower mpg until the rings seat? I'll be replacing the IAT sensor very soon.
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Old 11-03-2013, 02:59 PM   #7
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Default Re: Trouble codes..

Get that sensor fixed and quit driving or running the engine until it is.
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Old 11-03-2013, 04:06 PM   #8
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Default Re: Trouble codes..

Replaced the IAT sensor, cleared the codes then took it for another road test. Did well, now the only code that I have is the EGR. I tested continuity on the vacuum relay and it's good, not shorted or open,applied 12v and it opened so I just need to replace the valve and it'll all be good. Next thing after that is a front end alignment and tagging.

I still have to figure out and repair the odometers so I know when to change my break in oil.
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Old 11-03-2013, 05:10 PM   #9
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Default Re: Trouble codes..

When the solenoid opens it must also pass vacuum so check that if you did not. Replacement EGR that works may be a bit hard to find. The 93 and 94 are the same EGR valve. I would go to the local JY before buying a one size does not fit all aftermarket valve.
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Old 11-03-2013, 05:28 PM   #10
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Default Re: Trouble codes..

Thanks again OldNuc. I found the thread on the odometer gears so I just ordered a new set on EBay.
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