help with 1995 fault codes
Thread Starter
Instructor
Joined: Dec 2007
Posts: 117
Likes: 0
From: Callaway Florida
help with 1995 fault codes
so i just rebuilt my motor and had the computer tuned at pcmforless.com. i know they erased the previous codes that were stored into the computer and now starting off fresh. here is the problem...i'm getting H41(1),H13(4),H43(4),H64(9),H72(9). the numbers in ( ) are the little numbers that were listed right below the code on the speedo. can anyone help me with this as far as what to change? and is this going to be anything that would stop me from driving the car to try to get the thing broke in? thanks in advance!! 
Thread Starter
Instructor
Joined: Dec 2007
Posts: 117
Likes: 0
From: Callaway Florida
so i got all the same codes again...i disconnected the battery...drove the car till i got the lights and came home. parked the car and shut it off...got the codes and they had the H in front of them. i would assume that the H is going to be there because the car was shut down and was stored. any thoughts?
Racer
Joined: Dec 2006
Posts: 499
Likes: 27
From: shapleigh maine
You have three different modules reporting a problem, (the little numbers). 1 is CCM, 4 is PCM, 9 is ABS. Two of the codes are for loss of serial data communication, 41 and 72. Check wiring very carefully. You will need some way to view live data to proceed, if wiring inspection does not locate the trouble area. Good luck, Bob 
Melting Slicks
Joined: Aug 1999
Posts: 2,240
Likes: 41
From: Baltimore, MD USA
You probably don't have all the ground wires connected.
Verify all of the ground wires are connected at G106 and
G107 as shown in the diagram.
G106 is near the oil temperature sensor.
G107 is a stud from the transmission bellhousing to
the engine block.
Verify all of the ground wires are connected at G106 and
G107 as shown in the diagram.
G106 is near the oil temperature sensor.
G107 is a stud from the transmission bellhousing to
the engine block.
Thread Starter
Instructor
Joined: Dec 2007
Posts: 117
Likes: 0
From: Callaway Florida
i think you are on to something there because i have all the ground staps attached on the one stud...is there anyway you can make copies of the other side of the motor and the front...i dont know what book you got that from but i dont have it and im still trying to figure out how the wire harness routed to where it doesnt touch anything it shouldnt. ie headers pulleys and other misc stuff. that was a real big help thanks a lot!!!
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Melting Slicks
Joined: Aug 1999
Posts: 2,240
Likes: 41
From: Baltimore, MD USA
so i just rebuilt my motor and had the computer tuned at pcmforless.com. i know they erased the previous codes that were stored into the computer and now starting off fresh. here is the problem...i'm getting H41(1),H13(4),H43(4),H64(9),H72(9). the numbers in ( ) are the little numbers that were listed right below the code on the speedo. can anyone help me with this as far as what to change? and is this going to be anything that would stop me from driving the car to try to get the thing broke in? thanks in advance!!
72 Serial data line malfunction. The EBTCM detects three
consecutive serial data line messages that are ignored due to
errors in the transmission. (Could be related to the DTC 41 and 64).
13 Left front oxygen sensor open circuit. Engine is at operating
temp. for more than 2 minutes but oxygen sensor voltage is
steady. PCM will go into open loop.
43 problem with knock sensor circuit.
64 Throttle position signal malfunction.
EBTCM is not receiving reference voltage or a TP
sensor signal from the throttle position sensor.
Pic below is top of engine. Shows G108 top of intake manifold.
Pic below is right hand side of engine.
Pic below shows ground stud on back of transmission. One of the
ground wires appears to be a braided cable.
Pic below shows G109 which you probably never messed with. Goes
to passenger frame rail.
Last edited by Hooked on Vettes; Feb 12, 2012 at 01:17 AM.
Thread Starter
Instructor
Joined: Dec 2007
Posts: 117
Likes: 0
From: Callaway Florida
ok i dont get it...i regrounded everything using the pictures cleared the codes and replaced both o2 sensors for good measures...now the only thing i am getting is the dtc #63: bank 2 rf heated o2 #1 circuit open. ive already replaced the o2 sensors...any thoughts? is it safe to drive so i can start the break in of the motor?
Melting Slicks
Joined: Aug 1999
Posts: 2,240
Likes: 41
From: Baltimore, MD USA
Now you're getting DTC 63 Right front oxygen sensor circuit open.
Are you using an extension harness for the oxygen sensors?
Also re-seat the Gray/Clear colored connector at the PCM. That is
where the PCM receives the oxygen sensor signals.
Verify Fuse #20 15amp Oxygen fuse on the end/side of the instrument
panel is good. Should have 12 volts when ignition On.
Clean the frame ground connection at G109. That's the ground for the heater circuit for the oxygen sensor.
