4X4 Problem after replacing the TIMP

Martin from Denver Technician Posted   Latest  
Event
Driveability
2008 Dodge Ram 1500 SLT 5.7L (2 EZB) 5-spd (545RFE)
C140b - Transfer Case Motor Control Circuit Low

The dealer replace Totally Integrated Power Module (TIMP). After customer received the pickup, he notice that light in the dash flashes to service 4X4 system. Dealer suggested to let them check the vehicle, but after $2000.00 expended in the TIMP he decide to take the truck home.

Yesterday may 21 2018 I stared to check the vehicle. I used a MaxiSys scanner to get codes and check data...

Stepts I folowed when doing the diagnosis:

1.- Battery voltage - 12.47V - when monitored.

Totally Integrated Power Module (TIMP) set code P014B when detects low voltage on the transfer case motor control circuit for a period of 0.5 seconds...

Possible Causes:

a.- TIPM fuses: Fuse 9 - 30A - Ok... Fuse 25 - 10A - Ok... Fuse 29 - 10A - Ok... Fuse 30 - 15A - Ok...

b.- (T101) Shift motor control A circuit shorted to ground - circuit OK...

c.- (T102) Shift motor control B circuit shorted to ground - circuit OK...

d.- (T101) shift motor control A circuit shorted to (T102) shift motor control B circuit - circuit OK...

e.- Shift motor/mode sensor assembly - New

f.- Totally Integrated Power Module (TIMP) - ?...

Any suggestions...

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Brady from Yakima

 

Technician
 

Monitor pin 3 and 2 of connector C4 of the TIPM. Shift the transfer case around and test drive vehicle, see if the setting condition occurs. Good chance the shift motor is faulty but since the TIPM was just replaced I wonder if the condition was there before or not?

Does the transfer case shift at the moment?

+1

Martin from Denver

 

Technician
 

I have monitor pins 3 an 4 (wire DK GRN and YEL) using a multi meter, when I change position of T-Case switch. Noting happens all I see is - 0.00V - on the screen of multi meter...

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Albin from Leavenworth

 

Diagnostician
 

You need to use a scope for this. The Code is for low voltage for .5 seconds 1/2 second. Your eye will have to be pretty quick to see this on a DVOM, and the DVOM is going to need to be pretty quick to catch it

+2

Martin from Denver

 

Technician
 

The transfer-case won't shift, stay in neutral all the time... I will use a scope to monitor the pin 3 and 4... Thanks for your help Albin Moore...

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Martin from Denver

 

Technician
 

I have check pins 3 and 4 with the scope... the readings are the same no signal when I change the position of T-case switch... only straight line with - 0.00V - reading... vehicle in neutral all the time...

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Martin from Denver

 

Technician
 

The transfer-case won't shift, stay in neutral all the time... I will use a scope to monitor the pin 3 and 4... Brandy Johnson - Thanks for your help...

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Brady from Yakima

 

Technician
 

You may need to clear the code before the TIPM even attempts to shift the transfer case. What is the ohm reading between pin 3 and 4(through the shift motor)? If that's open circuit then you either have some bad wiring or a bad shift motor. Double check me but I believe the ohm reading should be approximately 2 ohms through the motor.

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Martin from Denver

 

Technician
 

The resistance is 2.4 Ohms testing from connector of TIMP wires DK GRN and YEL... I have cleared the codes after replacing the shift motor assembly...

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Brady from Yakima

 

Technician
 

Whoops sorry, I missed that you had already replaced the shift motor. That sounds like the shift motor damaged the TIPM to me. The code resets immediately???

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Martin from Denver

 

Technician
 

Thanks Brandy. I going to suggest to the customer to take the vehicle back to the Dealer...

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Rick from The Woodlands

 

Diagnostician
 

Check the TIPM connectors. WE numerous replacements and occasionally the connectors won't be installed correctly causing 4WD issues.

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Martin from Denver

 

Technician
 

I have is tight...

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