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GMTDScan Tech ?

Crankme69

Crankme69

New Member
Messages
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Location
Illinois the Corruption Capitol of USA
I just got the cable and was able to connect to my 1995. The truck runs good, but I am leery to do anything that may leave me without it. I do not have the long wrench that if I read the postings correctly I will need if I must move the IP. Based on what I have read searching here it appears my timing is advanced, but again I'm skeeerd to try anything with the software like like the TDC time set or TDC learn if doing that may end up leaving me without my truck.

So is there a risk doing the TDC learn & offset? Should I just leave it alone...?

Here is my snapshot from GMTDScan.
Snapshot created 2/26/2010 3:07:21 PM
__________________________________________________________________
ENGINE SENSORS
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Engine run time: 00:56:38
Boost pressure (MAP): 14.2 PSI
Desired EGR: 11.68 PSI
Desired idle: 562 RPM
EGR pressure: 14.36 PSI
EGR duty cycle: 99.6 %
Engine coolant temp: 187.3 F°
Engine speed: 562 RPM
Glow plug relay feedback: 0 Volts
Glow plug voltage: 0.2 Volts
Ignition voltage: 13.5 Volts
Wastegate duty cycle: 72.3 %

__________________________________________________________________
INFORMATION SENSORS
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PCM Calibration ID: 7135
Current DTCs: 0
Accel. ped. pos. 1: 0.59 Volts
Accel. ped. pos. 2: 4.45 Volts
Accel. ped. pos. 3: 4.08 Volts
Barometric pressure (BARO): 13.45 PSI
Battery voltage: 13.7 Volts
Fuel temperature: 86.8 F°
Intake air temp: 90.9 F°
Throttle position: 0 %
Turbo boost (Calculated): 0.75 PSI
Voltage reference sensor: 1.3 Volts

__________________________________________________________________
INJECTION PUMP SENSORS
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Actual injection pump timing: 28.07 Deg °
Cam reference missed: 0 Counts
Crank reference missed: 0 Counts
Fuel calibration: 120 Counts
Fuel rate: 7.81 mm³
Fuel rate - Cruise: 0 mm³
Fuel rate - Idle: 8.12 mm³
Fuel rate - Maximum transient: 42.5 mm³
Fuel rate - Throttle requested: 0 mm³
Injection pulse width: 1.67 ms
Injection timing - Measured: 6.3 Deg °
Injection timing - Desired: 6.7 Deg °
TDC offset: 0.35 Deg °

__________________________________________________________________
TRANSMISSION SENSORS
¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯
3-2 PWM solenoid duty cycle: 0 %
Cruise target speed: 0 MPH
Cruise speed error: 0 MPH
Current gear of transmission: 1 Gear
Current torque signal pressure: 25 PSI
Current transmission ratio: 1:4 Ratio
Error between desired and actual shift times for latest 1-2 upshift: 0 Sec
Error between desired and actual shift times for latest 2-3 upshift: 6.3 Sec
Force motor (PCS) - Duty cycle: 44.5 %
Force motor (PCS) - Feedback current: 0.84 Amps
Force motor (PCS) - Reference current: 0.82 Amps
Time of latest 1-2 upshift: 0.3 Sec
Time of latest 2-3 upshift: 0.4 Sec
TCC PWM solenoid duty cycle: 0 %
TCC slippage: 26 RPM
Transmission input speed: 543 RPM
Transmission output speed: 0 RPM
Transmission temperature: 150.4 F°
Turbine speed: 543 RPM
Vehicle speed: 0 MPH

__________________________________________________________________
STATUS FLAGS
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Shift lever:
Park/Neutral

Cruise control:
Cruise Off condition

TCC mode word 1:
TCC is being forced off
TCC enable solenoid valid
Low threshold for COPETCC selected
Use hyst. for vehicle speed
TCC is in release mode, slipping
TCC is in locked-adjust mode
TCC is being applied
Negative slip recently prevents apply

TCC mode word 2:
TCC PWM is on
Perform release
Perform apply
Min. threshold occurred
• TCC Bus. is valid
NDT occurs
Delay is in progress
Min. throttle occured

IOD port A:
Glow plug relay - Closed/Open
• Stepper motor inhibit - Run/Inhibit
Service Throttle Lamp - On/Off
• EGR vent enable - On/Off
• Shift A - On/Off
Shift B - On/Off
TCC enable - On/Off (4L60E only)
• Force Motor enable - On/Off

IOD SOD status register:
Coolant temp. pullup select - On/Off
Trans. temp. pullup select - On/Off
Fuel calibration temp. select - On/Off
Check Engine Lamp - On/Off
PWM1 - Reset/Normal
PWM2 - Reset/Normal
PWM3 - Reset/Normal
PWM4 - Reset/Normal

System status word:
FM shut off due to low battery
Force Motor pulse in progress
• Power is On/Off
COP2 is being serviced
Delco instrumentation PROM
• Powertrain is in motion

Discrete flags:
Brake - On/Off
A/C Compressor - Engaged/Disengaged
Power enrichment - Active/Inactive
Kickdown pattern - Active/Inactive
Four-Wheel Drive Low - Active/Inactive
Cruise low - Active/Inactive
Diagnostic - Requested/Not requested
 
Everything is fine, the measured timing of 6.3* and the desired of 6.7 is OK. They can be as high as 8.8*. The offset is within specs too, I would try an Offset learn to try for a -#. -1.5 to -1.94
 
You may have to rotate the pump to the drivers side.
You can buy a cheap 15mm wrench and bend it with a torch, the IP turning tool isn't needed, just put a couple bolts in the flange holes and use a large screwdriver to pry on the bolts to turn the IP.
 
It's just fine where it is, the difference might be a few hp. Like you said earlier, it's running good:thumbsup:
 
Hey the other kewl thing was being able to read my boost pressure finally. It spiked up almost to 12 pounds today when I nailed the go pedal on the expressway, kinda shocked me. Didn't think OEM chip would do that...maybe there's an aftermarket chip in it...still need to look see.

Spring is coming, thank goodness, got a bunch of little things I want to do, new oil cooler kit from Leroy, new sunpro gauges, front rotors need replacing...exhaust, never ends.

The scan tech is really nice, just wish we had a little screen to mount, like the big boys have...hint hint lol
 
They will spike with the stock tune, they just won't maintain the high boost.
 
ak diesel driver said:
I've been wondering if Scan Tech could be loaded on an I phone and the cable plugged into the usb.
Click to expand...

I can't remember the user name but someone back at the place mounted a small computer in the dash. That would give you ScanTech at all times.
 
The software should work on a palm pilot type computer. That's what I was going to do originally before I got a deal on a used laptop.
 
Yea palm pilot just might work...:thumbsup:

I have been reading as much info as I can find old post and surfing the net still I have questions...

When you select TDC time set and then select off is that the luck off the draw like playing a slot machine where it lands and does that number it ends up at have any effect on how far or the lets say does it alter the range that the TDC learn can be adjusted between or too? Or is it just an initialization function to prepare us to perform TDC learn?

Then after when we select TDC learn, how much variability should we expect to get? Mine was not giving many options and only a small range to pick from?

Also what does the memory dump function provide us with, when we use it & for what?
 
Well not getting a lot of variation is a good thing, means your timing is tightly controlled, like tight chain. Although you went from +.35 to -.18 that is a large range for not moving the pump. Unless that is just from installing the IP and not performing TDCO learn at that time in the past.

Factory spec is -.25 to -.75 so still not even in specifications yet, so I would move IP.

Your PCM and IP should be able to control timing close so desired and measured are about the same, within .1 or so. That chip should be BMRL.
 
Well just got done playing around again, -0.18 is as low as I can get it and that takes some doing to get it there, just try after try, cause I sure don't know what the hell I'm doing yet.

Sure seems to have more rattle like my old 7.3 now but that could just be my old feeble imagination. It sure rattles a fair amount going through the time set & learn procedure, is that normal?
 
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