Code 56. INjection pump resistor

[Acesneights1]

What does that mean what it says ? I have never heard of the resistor going bad in these. The truck stalls . when I clear the code it comes right back and when it does the truck shudders for a sec. PMD is on the IP . IP looks to have been changed somewhere along the line. Would PMD throw that ? Also she's knocking pretty good at idle. Sounds like real bad fuel knock like when you change injectors. Des and actual timing are at 5 deg but I can't do timing on it until I take care of the code. I really don't want to throw 4-500$ at this rag for a PMD kit not knowing what else might be wrong. Might try one of those "good used" ones for now but would that 56 be for the PMD or something else ?

 

[Missy Good Wench]

Is the resistor in the PMD ???

Possibly someone left it out or installed the wrong one.
A #5 will usually work in most applications.

I have never seen a resistor go bad but I have seen them left out or the wrong value installed..


MGW

 

[Acesneights1]

That's what I'm wondering, so Code 56 is what it says, the resistor. It's also stalling though. I opened the T vave when it was running and fuel came pouring out , no stall.

 

[matuva]

I bet they changed IP and forgot to put the resistor in the PMD

 

[Missy Good Wench]

I would scrounge up a remote cooler, Fresh (used PMD) and a #5 resistor and likely your issues will all go away and quickly..

No telliong on a used rig just what Has been done.

I have seen some real doooozies out there that have some of the damndest stories attached to them.

Ya just can't tell what folks are gonna do under the hood.

MGW

 

[Acesneights1]

Well that's my problem. I'm still not sure if I want to cut the truck up for parts so I don't want to spend 500$ on a Heath setup.

 

[JiFaire]

Git yerself a small mirror and a flashlight and take a look in the PMD socket, lad.

 

[Acesneights1]

I just so have a mirror.

 

[bison]

You should be able to feel the critter with a thin wire with a hook bend on

 

[Missy Good Wench]

An ebay cooler and a cable along with a good used PMD wont cost enywhere near that $$$$$

I get my "Good Used" PMD's for free.

Trying to snare a resistor from that PMD down under is likely to be a real exercise.

Just put together a cooler and a fresh "Good Used" PMD and a #5 resistor and you will probably be fine.

Less hastle, less stress and no worries.

Heck just use one of them coolers that mounts on the manifold.
Not the best choice but they work.
Save you the $$$ for a cable.

You can use that cooler remote later on.


MGW

 

[Acesneights1]

excatly. I just wnat to get the code and stalling one so I can assess the condtion of the truck. The knocking I think is timing but I can't mess with it until I get the codes taken care of. If they forgot the resistor, then it's been like that for a long time as pump is not that new looking but has definitely been replaaced in the last 6-7 years I'd say.

Here's a recent snap shot just before it threw the DTC. I will take another snapshot hopefully today. It was knocking badly when I took this. It sounds fuel.

Snapshot created 8/28/2009 8:51:20 PM
__________________________________________________________________
ENGINE SENSORS
¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯
Engine run time: 00:12:29
Boost pressure (MAP): 14.2 PSI
Desired EGR: 11.6 PSI
Desired idle: 600 RPM
EGR pressure: 11.53 PSI
EGR duty cycle: 53.9 %
Engine coolant temp: 158.4 F°
Engine speed: 600 RPM
Glow plug relay feedback: 0.1 Volts
Glow plug voltage: 0.1 Volts
Ignition voltage: 12.8 Volts
Wastegate duty cycle: 71.5 %

__________________________________________________________________
INFORMATION SENSORS
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PCM Calibration ID: 7365
Current DTCs: 0
Accel. ped. pos. 1: 0.65 Volts
Accel. ped. pos. 2: 4.39 Volts
Accel. ped. pos. 3: 4.04 Volts
Barometric pressure (BARO): 13.4 PSI
Battery voltage: 12.9 Volts
Fuel temperature: 97 F°
Intake air temp: 89.3 F°
Throttle position: 0 %
Turbo boost (Calculated): 0.8 PSI
Voltage reference sensor: 1.3 Volts

__________________________________________________________________
INJECTION PUMP SENSORS
¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯
Actual injection pump timing: 26.31 Deg °
Cam reference missed: 0 Counts
Crank reference missed: 0 Counts
Fuel calibration: 105 Counts
Fuel rate: 10.31 mm³
Fuel rate - Cruise: 0 mm³
Fuel rate - Idle: 10 mm³
Fuel rate - Maximum transient: 42.5 mm³
Fuel rate - Throttle requested: 0 mm³
Injection pulse width: 1.76 ms
Injection timing - Measured: 4.4 Deg °
Injection timing - Desired: 5 Deg °
TDC offset: -0.44 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: 0.08 Sec
Error between desired and actual shift times for latest 2-3 upshift: 6.35 Sec
Force motor (PCS) - Duty cycle: 43 %
Force motor (PCS) - Feedback current: 0.8 Amps
Force motor (PCS) - Reference current: 0.8 Amps
Time of latest 1-2 upshift: 0.22 Sec
Time of latest 2-3 upshift: 0.35 Sec
TCC PWM solenoid duty cycle: 0 %
TCC slippage: -21 RPM
Transmission input speed: 622 RPM
Transmission output speed: 0 RPM
Transmission temperature: 118 F°
Turbine speed: 622 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


__________________________________________________________________

 

[Acesneights1]

I'm going to hold off on buying any parts for this truck until Wed. see if I won the CUCV. That could be a major deciding factor in this trucks fate but I would like to see if the engine is worth saving.

 

[chrisk1500]

I have seen a resistor go bad and throw a code 56....gmctd and I figured it was just bad luck...

Timing looks to be off a touch....should be 3.5 ish degrees with an OE chip...

 

[Acesneights1]

Thanks. The ferm is hooking me up with a PMD so I can play with the timing once I get this resolved.

 

[Acesneights1]

OK so I got a few minutes today to work on this truck. Disconnecting the LP probably would be a PIA etc so I decided since i have a spare Raptor let's just run it out of a bucket. Now I'm beginning to doubt the IP is bad. The truck stumbled and shook and was overall pissed off but started with the Raptor supplying a nice 15 psi of fuel from a bucket. Once it smoothed out it sounded real nice but it is knocking. It doesn't sound like a bearing though. Here's the deal when it first starts and is on high idle it sounds really good. as the hig idle slowly kicks down it gets knockyier and noisier. Is the timing affected when the truck is on high idle ? Truck really sounds like it's idling a bit low and noisy. I'm gonna rig my fuel can up so I can drive with it and see if it dies but it was dead where it sat from the last test drive and would not start. Also if your going to do a test like this....don't forget to unplug the factory LP but the fuel coming out of the fuel line looked foamy. I'd be dope of the year if the truck was out of fuiel and the gauge off...dooyyyy.BTW that Raptor is a really nice pump. It literally blasts fuel into the IP. Not so much PSI as that is adjustable but just recovery.
More to come.

 

[JiFaire]

Glad to see you got yerself a REAL mechanic helping out, Kenny!

 

[Acesneights1]

Yeah but I should be wearing the Oscar the grouch shirt...

 

[Matt Bachand]

I'm pretty sure the timing is advanced during high idle. Perhaps there is a CTS issue? The knocking noise could be too advanced type of knock?

 

[Acesneights1]

I'm thinking possible. I don't think the temp gauge is working right. it didn't match what GMTDScan was reading. Gauge was lower than GMTDScan.

 

[Matt Bachand]

I'm thinking possible. I don't think the temp gauge is working right. it didn't match what GMTDScan was reading. Gauge was lower than GMTDScan.

I think I meant the Engine temp sensor, the one on top. Bad CTS (the one on head) would read false in cab, but not effect computers timing control based on adjusting for temp.