Thank you very much. I am wanting this truck code free and completely reliable. Never dreamed I would be chasing electrical gremlins in order to accomplish my goal.

 

Okay, I followed a parasitic battery drain video instructions and found the troublesome circuit.

I was getting 168 ma reading until I pulled the 50A fuse #22 in the under hood box then the meter dropped to 21ma.

Now I need to find a schematic for that circuit and start the troubleshooting.

 

The 50A fuse in #22 feeds the battery junction box (fuse box) inside the truck.
So I placed the fuse back in the panel under the hood and began pulling fuses inside.
The culprit is #15, a 5A fuse that protects the: Stop Lamp Switch (logic), Generic Electronic Module (GEM), Powertrain Control Module (PCM), Four Wheel Anti-lock Brake System (4WABS) Module, Brake Shift Interlock, Cluster and PCM Keep Alive Memory.

Not sure but it sounds like the most expensive circuit in the truck but then I could just be paranoid. LOL

I am going to hook everything back up and take the truck for a drive. When I get back I will pull the codes with FORscan and hop I get some kind of indicator as to where to look.

 

No, I think you are right about it being the most expensive circuit in the truck. Tell me, has the truck shown any signs of water damage near the GEM or has it had the windshield replaced recently?

You are going to have to isolate those devices one by one to see which is the problem as you have been doing to get this far. You are doing well, in a short amount of time. Keep it up!

 

I am not even sure where to look for them.
There must be a diagram or photo somewhere on here but no luck finding it so far. Maybe I am using the wrong words in my searches? Kinda like using the word parasitic when hunting down information. I kept trying battery drain or draw down and got tons of stuff that didn't help.

 

Brake lights seem to be functioning fine so I doubt its that switch.
I have zero ABS code faults so I figure that's not the problem.

 

Ran the codes again today using the FORScan:

===OBDII DTC P0670-C===
Code: P0670 - Glow Plug Module Control Circuit

Status:
- Confirmed - malfunction is confirmed

Module: On Board Diagnostic II

Diagnostic Trouble Code details

Glow Plug Module Control Circuit

This DTC may be caused by :

Open circuit.

Short circuit

Possible causes are:

Harness wiring

GPCM

PCM

===END OBDII DTC P0670-C===

===OBDII DTC P1690-P===
Code: P1690 - Wastegate Solenoid Circuit

Status:
- Pending - malfunction is expected to be confirmed

Module: On Board Diagnostic II

Diagnostic Trouble Code details

Wastegate Solenoid Circuit

Follow the routines in the service manual to resolve the DTC listed.

===END OBDII DTC P1690-P===

===PCM DTC P1690===
Code: P1690 - Wastegate Solenoid Circuit

Module: Powertrain Control Module

Diagnostic Trouble Code details

Wastegate Solenoid Circuit

Follow the routines in the service manual to resolve the DTC listed.

===END PCM DTC P1690===

===PCM DTC P1000===
Code: P1000 - On-Board Diagnostic (OBD) Systems Readiness Test Not Complete

Module: Powertrain Control Module

Diagnostic Trouble Code details

Check of all systems is not complete since last memory clear.

--Possible Causes--
- The vehicle is new from the factory and has not yet been through a complete OBD Drive Cycle.
- The battery or PCM has been disconnected.
- An OBD monitor failure had occurred prior to completion of an OBD Drive Cycle.
- The PCM DTCs have been cleared as part of a service process.

Note: The only way P1000 can be cleared (removed) from memory is when all of the OBD monitors have been successfully completed during normal vehicle operation.

P1000 cannot be cleared from the PCM when: 1. The thermostat is stuck open and a DTC is not generated. 2. There is an open VSS circuit and a DTC is not generated. 3. If the vehicle has a Power Take Off (PTO), the circuit is shorted to VPWR or B+, or the PTO is ON during Self-test.

The purpose of the Diagnostic Trouble Code DTC P1000 is to indicate that not all of the On Board Diagnostics OBD monitors have yet been successfully completed. You may also refer to the OBD Drive Cycle defined under the Powertrain Control/Emission Diagnosis Manual-Diagnostic Methods or the Owner's Manual.

Remember: It is not necessary to remove P1000 from the Powertrain Control Module PCM by driving the vehicle.

===END PCM DTC P1000===

===PCM DTC P0230===
Code: P0230 - Fuel pump primary circuit malfunction

Module: Powertrain Control Module

Diagnostic Trouble Code details

Fuel pump primary circuit malfunction.

This DTC may be caused by :

Open or grounded fuel pump primary circuit.

Relay

Improper connection

fuel pump relay short circuit to positive

Fuel pump open circuit

No live feed to the fuel pump relay

Open or grounded fuel pump primary circuit.

Faulty or damaged PCM.

===END PCM DTC P0230===

===PCM DTC P1662===
Code: P1662 - Injector Driver Module Failure

Module: Powertrain Control Module

Diagnostic Trouble Code details

Injector Driver Module Failure

Follow the routines in the service manual to resolve the DTC listed.

===END PCM DTC P1662===

===PCM DTC P0640===
Code: P0640 - Manifold Intake Air Heater Control Circuit Fault

Module: Powertrain Control Module

Diagnostic Trouble Code details

Manifold Intake Air Heater Control Circuit Fault

This DTC may be caused by :

Open circuit.

Short to Ground

Possible causes are:

Harness wiring

MIAH Relay

PCM

Inspect connectors for signs of damage, water ingress, corrosion, etc.

===END PCM DTC P0640===

===PCM DTC P0670===
Code: P0670 - Glow Plug Module Control Circuit

Module: Powertrain Control Module

Diagnostic Trouble Code details

Glow Plug Module Control Circuit

This DTC may be caused by :

Open circuit.

Short circuit

Possible causes are:

Harness wiring

GPCM

PCM

===END PCM DTC P0670===

===ECS DTC B1869===
Code: B1869 - Lamp Air Bag Warning Indicator circuit failure

Module: Electronic Crash Sensor

Diagnostic Trouble Code details

Lamp Air Bag Warning Indicator circuit failure

===END ECS DTC B1869===

===GEM DTC None===
Successful DTC reading, no error codes found

Module: Generic Electronic Module

===END GEM DTC None===

===ABS DTC None===
Successful DTC reading, no error codes found

Module: Antilock braking system

===END ABS DTC None===

Being a beginner at all this stuff my take is this: Good News: no faults in GEM or ABS Bad News: I may have spent $300 dollars on the glow plugs and GPCM for nothing. The Wastegate Circuit problem is leading me to the PCM since I have traced the wiring all the way to the main harness before the plug.

 

Can all these things actually be defective and the truck still run good?

Maybe one of you with more experience in this could review the list and see a common denominator or something the might more closely pinpoint the problem(s)?

 

I am very inexperienced in this area, but I know that the truck will not run without a properly functioning IDM.

IDM - will not run
Air bag warning - truck will run
GPCM - May only effect cold starts like a failing GPR, but not sure
Air intake heater - truck will run
Fuel pump - truck will not run

Are all of these related somehow, I have no idea. Hopefully someone will be along shortly to provide some better advice.

 

Do you think I should start another thread asking for help with deciphering the codes?

 

That would probably be a good idea and link this thread to the new one.

Sorry I could not be of more assistance and I understand electrical problems can be a pain in the *** at times. I work in the IT field and the gremlins seem to spawn from wires and machines at times...

 

Is there a way to test the PCM using FORScan?

 

Back to the parasitic battery drain.

Today I tore the dash a part hoping to find the culprit connector or component.

Checked everything listed and even checked with the PCM disconnected, then the dash completely unplugged and still 170 mA draw.

Decided to pull the upper gray plug on the GEM and viola the meter dropped to 22 mA. Plugged it back in and meter jumped to 170 mA.

Left it plugged in and removed the lower (smaller) gray plug and the meter dropped 86 mA and when plugged back in the meter was again at 170 mA.

Can anyone tell me what to do next?

 

I believe the GEM rebuild took care of the Parasitic Battery Drain.

Now I am back to the PCM and the Codes that won't go away.

Here is the reading from the FORScan PCM Module self test with KOER:

(OK) [12:22:52.683] Key On Engine Running On Demand Self-Test has been started
(WARN) [12:24:11.359] Test completed, found DTCs: P0476, P0640, P0670



===DTC P0476===
Code: P0476 - Exhaust pressure control valve malfunction

Module: Powertrain Control Module

Diagnostic Trouble Code details

Exhaust pressure control valve performance.

--Possible Causes--
- Stuck or damaged butterfly.
- Misadjusted or damaged linkage.
- Restricted Exhaust.
- Exhaust leaks.
- Exhaust Pressure Regulator (EPR) valve.
- Exhaust Back Pressure sensor.
- Damaged PCM.

===END DTC P0476===



===DTC P0640===
Code: P0640 - Manifold Intake Air Heater Control Circuit Fault

Module: Powertrain Control Module

Diagnostic Trouble Code details

Manifold Intake Air Heater Control Circuit Fault

This DTC may be caused by :

Open circuit.

Short to Ground

Possible causes are:

Harness wiring

MIAH Relay

PCM

Inspect connectors for signs of damage, water ingress, corrosion, etc.

===END DTC P0640===




===DTC P0670===
Code: P0670 - Glow Plug Module Control Circuit

Module: Powertrain Control Module

Diagnostic Trouble Code details

Glow Plug Module Control Circuit

This DTC may be caused by :

Open circuit.

Short circuit

Possible causes are:

Harness wiring

GPCM

PCM

===END DTC P0670===

 

Codes can be a pain in the ***, but at least now your truck should start when you need it to. Good job on getting it sorted out and posting the results.