Code 56. INjection pump resistor

[Acesneights1]

the 2000 rpm test was ok it just has a little shudder between1100-1500 rpm.

 

[Acesneights1]

I gotta scan it again

 

[ak diesel driver]

I guess I don't understand how you can say it passed the 2000 rpm test when it has a shudder?

 

[Acesneights1]

no shuddder at 2000. It doesn't fall off when decel just has a very slight miss. It will have the shudder if you hold it at say 1300 but will hold at 1300. I was under the impressiont eh IP test was to see if the amrature was working. Am I wrong ?

 

[ak diesel driver]

Bill told me any hiccup at all one the way up or down tells you the IP isn't happy.

 

[buddy]

I think there is still more to look at before condemning an IP, its kind of a complex system to judge it only on an idle RPM test. If your timing is still really low at idle like we saw before, it could just be thats when youve finally gotten back up to where the rest of are normally timed at idle. That and your fuel rate was higher than normal. And that is each computer controlled.

 

[Acesneights1]

Yeah I need to play with the truck some more. I have been slammed busy the last two weeks with work so I back burnered it but would like to see what's up so I can see if it's worth selling or not. Could use some CUCV funds.....

 

[Acesneights1]

Soooo....Can any diesel experts tell me what is wrong with the truck ?? You know , when time allows sometines the best thing to do is leave it for another day. It's sunday, I slept late, been having a run of rare good luck this week and decided to give 'er another look see. Can you tell what's wrong with tis pic ? I thought maybe I left it loose but it only took a 1/16 inch if not less with seriuos effort and the leak stopped. The truck runs MINT !!! Still think the timing could use a bump. Here's the latest snapshot taken today....
Of course I dropped and broke my camera but it was a cheap POS. Small price to pay for a running truck.):h

Snapshot created 10/4/2009 11:15:33 AM
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ENGINE SENSORS
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Engine run time: 00:01:45
Boost pressure (MAP): 14.2 PSI
Desired EGR: 11.53 PSI
Desired idle: 562 RPM
EGR pressure: 11.46 PSI
EGR duty cycle: 52.7 %
Engine coolant temp: 183.6 F°
Engine speed: 562 RPM
Glow plug relay feedback: 0 Volts
Glow plug voltage: 0.1 Volts
Ignition voltage: 13.3 Volts
Wastegate duty cycle: 74.6 %

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INFORMATION SENSORS
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PCM Calibration ID: 7365
Current DTCs: 0
Accel. ped. pos. 1: 0.65 Volts
Accel. ped. pos. 2: 4.41 Volts
Accel. ped. pos. 3: 4.04 Volts
Barometric pressure (BARO): 13.29 PSI
Battery voltage: 13.2 Volts
Fuel temperature: 95.1 F°
Intake air temp: 91.8 F°
Throttle position: 0 %
Turbo boost (Calculated): 0.91 PSI
Voltage reference sensor: 1.3 Volts

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INJECTION PUMP SENSORS
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Actual injection pump timing: 29.57 Deg °
Cam reference missed: 0 Counts
Crank reference missed: 0 Counts
Fuel calibration: 145 Counts
Fuel rate: 5.94 mm³
Fuel rate - Cruise: 0 mm³
Fuel rate - Idle: 6.25 mm³
Fuel rate - Maximum transient: 42.5 mm³
Fuel rate - Throttle requested: 0 mm³
Injection pulse width: 1.78 ms
Injection timing - Measured: 7.4 Deg °
Injection timing - Desired: 7.4 Deg °
TDC offset: -1.14 Deg °

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TRANSMISSION SENSORS
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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: 6.25 Sec
Force motor (PCS) - Duty cycle: 42.6 %
Force motor (PCS) - Feedback current: 0.8 Amps
Force motor (PCS) - Reference current: 0.8 Amps
Time of latest 1-2 upshift: 0.3 Sec
Time of latest 2-3 upshift: 0.45 Sec
TCC PWM solenoid duty cycle: 0 %
TCC slippage: -10 RPM
Transmission input speed: 564 RPM
Transmission output speed: 0 RPM
Transmission temperature: 139.6 F°
Turbine speed: 564 RPM
Vehicle speed: 0 MPH

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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


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[Acesneights1]

Also note the engine coolant temp 183 deg F. The dash guage was barely off cold. Wonder what's going on there ??

 

[Acesneights1]

BTW If you own a 94-95 6.5TD and don't own GMTDScan, it should be your next purchase. I am probably going to register the truck next week so I have something to drive besides the CUCV. The Lemon sits dead in the driveway again..... It's being sold as soon as I can fix it.

 

[buddy]

Well it looks like to me you performed TDCO relearn and it has update to -1.14 from -0.44 before. So it was wrong before and causing your issue, so relearning TDCO saves the day again.

dash pulls from CTS, sender on drivers side. ECT sensor for PCM comes from thermostat housing. Mine comes up to 180 the same, but then the PCM might read a little higher.

 

[Acesneights1]

Actually the missing issue was the loose injector line. As soon as I tightened it the truck ran smooth. It even had a stored inj bal code. I had doen the relearn last week but miss was still present.
HOw do the timing numbers look now thought ? The tdco is ok but what about the measured and desired ? They look low to me but I'm comparing to my Tahoe snapshot which had a Heath Chip and had different readings than a stock chip.

 

[Acesneights1]

Truck sounds, runs an starts perfectly BTW.

 

[Turbine Doc]

Soooo....Can any diesel experts tell me what is wrong with the truck ?? You know , when time allows sometines the best thing to do is leave it for another day. It's sunday, I slept late, been having a run of rare good luck this week and decided to give 'er another look see. Can you tell what's wrong with tis pic ? I thought maybe I left it loose but it only took a 1/16 inch if not less with seriuos effort and the leak stopped. The truck runs MINT !!! Still think the timing could use a bump. Here's the latest snapshot taken today....
Of course I dropped and broke my camera but it was a cheap POS. Small price to pay for a running truck.):h

Snapshot created 10/4/2009 11:15:33 AM
__________________________________________________________________
ENGINE SENSORS
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Engine run time: 00:01:45
Boost pressure (MAP): 14.2 PSI
Desired EGR: 11.53 PSI
Desired idle: 562 RPM This looks low min idle should be 650; does tach and scan tool idle match, is there a display for actual ???
EGR pressure: 11.46 PSI
EGR duty cycle: 52.7 %
Engine coolant temp: 183.6 F°
Engine speed: 562 RPM Okay looks like answer to my 1st question if this is actual this is low
Glow plug relay feedback: 0 Volts
Glow plug voltage: 0.1 Volts
Ignition voltage: 13.3 Volts
Wastegate duty cycle: 74.6 %

__________________________________________________________________
INFORMATION SENSORS
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PCM Calibration ID: 7365
Current DTCs: 0
Accel. ped. pos. 1: 0.65 Volts
Accel. ped. pos. 2: 4.41 Volts
Accel. ped. pos. 3: 4.04 Volts
Barometric pressure (BARO): 13.29 PSI
Battery voltage: 13.2 Volts
Fuel temperature: 95.1 F°
Intake air temp: 91.8 F°
Throttle position: 0 %
Turbo boost (Calculated): 0.91 PSI
Voltage reference sensor: 1.3 Volts

__________________________________________________________________
INJECTION PUMP SENSORS
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Actual injection pump timing: 29.57 Deg ° 29.57 actual at idle ???:nono: something is amiss here even with a cold advance but at 183 ECT you should be off of cold advance
Cam reference missed: 0 Counts
Crank reference missed: 0 Counts
Fuel calibration: 145 Counts
Fuel rate: 5.94 mm³ this is low
Fuel rate - Cruise: 0 mm³
Fuel rate - Idle: 6.25 mm³
Fuel rate - Maximum transient: 42.5 mm³ Maximum transient ??? not sure what this is, but if max fuel you've seen thus far it's being limped, max S stock fuel rate should be 56, and F should be 63
Fuel rate - Throttle requested: 0 mm³
Injection pulse width: 1.78 ms
Injection timing - Measured: 7.4 Deg ° is this a idle measurement ?
Injection timing - Desired: 7.4 Deg °
TDC offset: -1.14 Deg °

__________________________________________________________________
TRANSMISSION SENSORS
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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: 6.25 Sec
Force motor (PCS) - Duty cycle: 42.6 %
Force motor (PCS) - Feedback current: 0.8 Amps
Force motor (PCS) - Reference current: 0.8 Amps
Time of latest 1-2 upshift: 0.3 Sec
Time of latest 2-3 upshift: 0.45 Sec
TCC PWM solenoid duty cycle: 0 %
TCC slippage: -10 RPM
Transmission input speed: 564 RPM
Transmission output speed: 0 RPM
Transmission temperature: 139.6 F°
Turbine speed: 564 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


__________________________________________________________________

Kenny I'm seeing some stuff that is odd to me but I don't know the scan tool you are using check PMs & call me or shoot me your# & I can call U

 

[Acesneights1]

OK. I am using GMTDscan.

 

[Acesneights1]

The snapshot was done wit the truck idling at what I believe was operating temp.

 

[buddy]

I think all your stuff is good. Relearning TDCO fixed all the timings up, and shows that it doesnt learn itself eventually, since that IP has probably been in there a while with the wrong TDCO value.

the actual should be about 30 degrees at idle. Its the 7-8 measured that has gotten better, and a little low due to the idle RPM. I imagine when its cold your measured timing is closer to 11 degrees.

the maximum transient is only the max it has seen since it was started last, not the max allowed.

My idle is often around 580-600RPM.

 

[buddy]

And one of mine, showing Kenny's is about the same as mine.

ENGINE SENSORS
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Engine run time: 00:01:05
Boost pressure (MAP): 14.6 PSI
Desired EGR: 15.23 PSI
Desired idle: 562 RPM
EGR pressure: 14.79 PSI
EGR duty cycle: 0 %
Engine coolant temp: 175.2 F°
Engine speed: 562 RPM
Glow plug relay feedback: 0.1 Volts
Glow plug voltage: 0.1 Volts
Ignition voltage: 13.1 Volts
Wastegate duty cycle: 74.6 %

__________________________________________________________________
INFORMATION SENSORS
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PCM Calibration ID: 6969
Current DTCs: 0
Accel. ped. pos. 1: 0.63 Volts
Accel. ped. pos. 2: 4.39 Volts
Accel. ped. pos. 3: 4.08 Volts
Barometric pressure (BARO): 13.88 PSI
Battery voltage: 13.2 Volts
Fuel temperature: 116.1 F°
Intake air temp: 117.1 F°
Throttle position: 0 %
Turbo boost (Calculated): 0.72 PSI
Voltage reference sensor: 1.3 Volts

__________________________________________________________________
INJECTION PUMP SENSORS
¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯
Actual injection pump timing: 31.94 Deg °
Cam reference missed: 0 Counts
Crank reference missed: 0 Counts
Fuel calibration: 145 Counts
Fuel rate: 7.81 mm³
Fuel rate - Cruise: 0 mm³
Fuel rate - Idle: 8.12 mm³
Fuel rate - Maximum transient: 39.69 mm³
Fuel rate - Throttle requested: 0 mm³
Injection pulse width: 1.75 ms
Injection timing - Measured: 8.3 Deg °
Injection timing - Desired: 8.6 Deg °
TDC offset: -1.94 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:0 Sec
Force motor (PCS) - Duty cycle: 46.9 %
Force motor (PCS) - Feedback current: 0.82 Amps
Force motor (PCS) - Reference current: 0.82 Amps
Time of latest 1-2 upshift: 0 Sec
Time of latest 2-3 upshift: 0 Sec
TCC PWM solenoid duty cycle: 0 %
TCC slippage: -6 RPM
Transmission input speed: 582 RPM
Transmission output speed: 0 RPM
Transmission temperature: 184.1 F°
Turbine speed: 582 RPM
Vehicle speed: 0 MPH

 

[JiFaire]

I think all your stuff is good. Relearning TDCO fixed all the timings up, and shows that it doesnt learn itself eventually, since that IP has probably been in there a while with the wrong TDCO value.

You probably need to do the re-learn again, Kenny... it shouldn't learn with a stored code (injector balance)... Warm it up good.

Buddy is right about the 2 sensors... if you have that much discrepancy, you need to check into that. One of them is probably right... question is, which one? If the CTS is wrong, there goes your timing and idle calibrations again... it will affect your shifting, too.

I hate picky little stuff like that; it doesn't take too many little things to cascade into what appears to be something serious (but really isn't).

PS - good work getting to the fuel leak - lower pressure = erratic or no 'pops' for #1.

 

[Acesneights1]

Well, I'll get her hot again and hit the motor with my laser heat probe and see which is closer and change the other. Then try to do the relearn.