This van is a 1995 GMC that has over 150,000 miles on the odometer.
my ecm
http://www.gearhead-efi.com/Fuel-Inj...4&d=1397250470
Will you please tell me how to interpret these logs.
The codes are
15 coolant sensor low
22 tps
33 map high
42 ignition error
43 knock sensor circuit failure
The Fuel looks like it is lean. 13.7
This is my first time....
Last edited by vandura95; 10-07-2014 at 04:40 AM. Reason: Add text
I've always wondered why they have afr readings. I'm not sure it's even possible for the o2 sensor to give any specific reading other than stoich 14.7 or lean/rich.
probably they put the open loop's target AFR in the datastream.
13.7 would be rich, not lean, but that AFR value probably doesn't mean anything.The Fuel looks like it is lean. 13.7
Originally Posted by vandura95
Concerning the dtc's, I would look at ground wires, making sure they are getting good contact. They may share a common ground which could throw all those codes.
Buddrow
If it don't fit force it, if it don't force fit f&%@ it!
There are several grounds on the back of the engine head on the 4.3 vin W. Mine had 2 with rat chew marks and another soaked in oil so the insulation was spongy. Ended up replacing them all.
On other GM vehicles I have worked on there are grounds that go to the thermostat housing. Thats an easy one to check too.
Double check the wiring diagram sensor grounds, also check the ground at the ecm connector. If the grounds are solid the next check is the supply voltage to the associated sensors. Should have a 5 volt reference voltage supplied to the tps, cooant temp, map sensors. If there's not 5v ref voltage start at the ecm and work your way to the sensors.
Buddrow
If it don't fit force it, if it don't force fit f&%@ it!
I know of the two grounds on the thermostat housing, I cleaned them and added electric grease.
I have located 3 ground wires on the rear of the block attached to the transmission bolt there is some missing insulation on the wire and I could see the strands of wire. I cleaned them and greased them prior to the log.
There is also a braided cable at the rear of the block. I will solder new terminals on all these wires. I will check the ground at the ECM, which will be very difficult in the conversion van.
Are there any other ground concerns I should search out?
There was no SES light or codes when I checked with the "paper clip"
I was only aware of these codes after I ran Tuner pro5.
I checked the TPS with a volt meter prior to the log.
If I unplug the knock sensor or the temp sensor the CES light will indicate this and illuminate.
"Stevo 13.7 would be rich, not lean, but that AFR value probably doesn't mean anything."
Now I know the smaller number equates to a richer mix.
Hey vandura, noobie myself I wanted to know how you got codes out of tuner pro? I use my scanner (actron) but loaned it out.
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