LMM: Possible encoder issue? Service 4wd - Diesel Place : Chevrolet and GMC Diesel Truck Forums
 
Home Forum Market Place Garage Tuning Library DTC Tool Register Vendors
Go Back   Diesel Place : Chevrolet and GMC Diesel Truck Forums > Speciality Forums > Drivetrain - 2001 - 2010
Register FAQ Forum Rules My Replies My Threads Mark Forums Read Advertise

Drivetrain - 2001 - 2010 Discuss front and rear axle, transfer case, brakes, etc. Transmission questions belong in the appropriate transmission forum below. First through fourth generation...

DieselPlace.com is the premier Duramax Diesel Forum on the internet. Registered Users do not see the above ads.
Reply
 
LinkBack Thread Tools
Old 08-20-2019, 02:17 PM   #1 (permalink)
2ltrgsr
Sparkplug Hunter
 
Join Date: Aug 2019
Posts: 1
iTrader Score: 0 reviews

LMM: Possible encoder issue? Service 4wd

Well I'm having a hell of a time with this service 4WD, I have no lights on the selector switch for what gear I'm in.
So far I have these codes: C0321 C0392 B0770
I cleaned the ground under the cab.
Replaced the actuator in the front differential.
New dorman TCCM installed...
Still nothing!
Please help me out!

__________________
2009 Silverado LTZ 4x4
DPF, EGR and CAT delete
Efi live tuned
Offline  
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Old 08-20-2019, 04:19 PM   #2 (permalink)
Rvn4me
Diesel Pro
 
Rvn4me's Avatar
 
Join Date: Jun 2016
Posts: 2,253
iTrader Score: 0 reviews

Michigan Oil Burners Member

Who programmed your new TCCM? I usually replace certain parts with only OEM especially electronics.

C0321 Diagnostic Aids

When the circuits operating the lock solenoid are not complete the lock is engaged. When the circuit is completed the lock is disengaged.

Circuit/System Testing

The battery positive voltage circuit and the lock solenoid control circuit must be tested for opens, shorts to ground, shorts to voltage, and high resistance. This can also result from a electrically faulted solenoid.

With the ignition on check which DTC is set. If DTC C0321 is set with failure type byte 04 then do the following.
- The transfer case lock is unable to hold during a hold test and the transfer case actuator will need to be replaced, and the motor learn procedure performed. If this is not the case continue to the next step.
Disconnect the transfer case actuator, turn on the ignition and with a DMM check the battery positive voltage circuit for battery voltage at the transfer case actuator.
- If battery voltage is not seen then repair the battery positive voltage circuit for an open or high resistance. If the circuit checks out proceed to the next step.
Disconnect the transfer case control module connector X2 and check the circuit for an open, high resistance, short to ground, or short to voltage. If condition is found repair the circuit or inline connector 109 as necessary, if the condition is not found refer to component testing.
Component Testing

With the ignition off check the resistance of the lock solenoid with a DMM by probing Pins C and B on the transfer case actuator.

If the resistance reads 16-42 ohms then replace the transfer case control module, program, and complete the motor learn procedure. If the resistance is not in range then replace the transfer case actuator, and complete the motor learn procedure.

C0392 Diagnostic Aids

A RPS signal voltage that remains low 0.5 or lower indicates a short to ground on the RPS signal voltage circuit. It can also indicate an open or high resistance on the RPS low reference signal circuit.

Circuit/System Testing

The RPS 5-volt reference circuit, RPS low reference circuit, and RPS sensor signal circuits should be checked for shorts to ground, shorts to voltage, and opens or high resistance.

With the ignition on check the RPS 5-volt reference signal on the RPS connector pin 8 with the connector disconnected using a DMM.
- The DMM should indicate 4.8-5.2 volts, if the voltage is low check for an open or high resistance or short to ground. If the voltage indicates the voltage is over the specification check for a short to voltage. If the circuit checks good replace the transfer case control module, program, and complete the motor learn procedure. If the circuit checks good with the RPS disconnected, connect the RPS and see if the DTC still show as current. If it does proceed to the next step.
With the transfer case shift control module connector X1 and X2 disconnected and the RPS disconnected check the RPS signal circuit and the RPS low reference circuits for shorts to ground, high resistance, or shorts to voltage.
- If a shorting condition has been found then repair the circuits as necessary. If nothing is found in circuit testing then replace the RPS, and perform the motor learn procedure


Last edited by Rvn4me; 08-20-2019 at 04:24 PM.
Offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Diesel Place : Chevrolet and GMC Diesel Truck Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

PLEASE READ! You must check your email inbox for the confirmation link to complete registration. Please check your spam box if you do not see the email in your inbox.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:
Insurance
Please select your insurance company (Optional)

Log-in


Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -4. The time now is 12:13 PM.


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Shoutbox provided by vBShout v6.2.1 (Lite) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd. Runs best on HiVelocity Hosting.
© AutoGuide