Service 4 wheel drive ...message

[PARAGON]

<H1>DTC C0329</H1><A name=ss1-857757><A href="#ss1-857757">
<H5>Circuit Description</A></H5>


The transfer case shift control module has four encoder channels coming out
of it which are all supplied 5volts. These four channels are P, C, A, and
B, each running to a switch located inside the encoder/motor assembly. When a
particular encoder channel is active, the switch is closed and 5volts
flows through the encoder signal return circuit. If the module wants to request
motor position, a low side driver pulls the voltage low on the encoder signal
return and the corresponding channel circuit indicating motor position.</P>


The transfer case shift control module supplies 5volts on all the
channels As these channels are pulled to ground, the module can interpret the
location of the transfer case shift position.</P>


This DTC detects a short to ground in the encoder signal return circuit, or a
short to ground in the encoder channel circuits.</P><A name=ss2-857757><A
href="#ss2-857757">
<H5>Conditions for Running the DTC</A></H5>
<UL type=BULLET>
<LI>Ignition is ON.
<LI>System voltage is 9-18volts. </LI>[/list]<A name=ss3-857757><A
href="#ss3-857757">
<H5>Conditions for Setting the DTC</A></H5>


The transfer case shift control module can command the low side driver on the
encoder signal return circuit not to pull the signal low. The module can then
read the voltage on each of the encoder channel circuits. If the voltage is low
a short to ground is indicated and the DTC is logged.</P><A name=ss4-857757><A
href="#ss4-857757">
<H5>Action Taken When the DTC Sets</A></H5>
<UL type=BULLET>
<LI>All motor activity will stop.
<LI>All the transfer case shift control switch mode indicators will be commanded
OFF.
<LI>The SERVICE 4WD indicator will be commanded ON, and an active DTC set, when
a shift is requested.
<LI>If a shift is not being requested the DTC will go to history.
<LI>If a new mode is requested while the DTC is present either current or
history, the indicator for the mode requested will flash for 15seconds and
then go out. </LI>[/list]<A name=ss5-857757><A href="#ss5-857757">
<H5>Conditions for Clearing the DTC</A></H5>
<UL type=BULLET>
<LI>The transfer case shift control module will clear the DTC if the condition
for setting the DTC no longer exists.
<LI>A history DTC will clear after 33consecutive ignition cycles without a
fault present.
<LI>History DTCs can be cleared using a scan tool. </LI>[/list]<A
name=ss6-857757><A href="#ss6-857757">
<H5>Test Description</A></H5>


The numbers below refer to the step numbers on the diagnostic table.</P>

1. <A name=TD02>
   <LI value=2>
   
   
   This step determines if one or more of the encoder channel circuits are
   shorted to ground.</P><A name=TD03>
   <LI value=3>
   
   
   This step checks with a DMM for a short to ground on any of the four encoder
   channel circuits.</P><A name=TD04>
   <LI value=4>
   
   
   This step checks the encoder sign return circuit for a short to ground.</P><A
   name=TD05>
   <LI value=5>
   
   
   This step determines if a faulty transfer case shift control module is
   causing the DTC to set.</P><A name=TD06>
   <LI value=6>
   
   
   This step determines if the encoder motor is causing the DTC to
   set.</P></LI>

<TABLE width="100%" border=1>
<TBODY>
<TR>
<TH vAlign=bottom align=middle>


Step</P></TH>
<TH vAlign=bottom align=middle>


Action</P></TH>
<TH vAlign=bottom align=middle>


Value(s)</P></TH>
<TH vAlign=bottom align=middle>


Yes</P></TH>
<TH vAlign=bottom align=middle>


No</P></TH></TR>
<TR>
<TD vAlign=bottom align=left colSpan=5>


Schematic Reference: <A
href="/servlets/CellHandler?CellId=69955&RefDoc=857757&evc=sm">Tra nsfer
Case Control Schematics</A> </P>


Connector End View Reference: <A
href="/servlets/CellHandler?CellId=69957&RefDoc=857757&evc=sm">Tra nsfer
Case Control Connector End Views</A> </P></TD></TR>
<TR>
<TD vAlign=center align=middle><A name=S01>


1</P></A></TD>
<TD vAlign=top align=left>


Did you perform the Diagnostic System Check - Transfer Case?</P></TD>
<TD vAlign=center align=middle>


--</P></TD>
<TD vAlign=bottom align=middle>


Go to Step2 </P></TD>
<TD vAlign=bottom align=middle>


Go to <A
href="/servlets/CellHandler?CellId=69959&RefDoc=857757&evc=sm">Dia gnostic
System Check - Transfer Case</A> </P></TD></TR>
<TR>
<TD vAlign=center align=middle><A name=S02>


2 </P></A></TD>
<TD vAlign=top align=left>

1. <LI type=1>Set the parking brake.
   <LI type=1>Raise the vehicle on a hoist.
   <LI type=1>Disconnect the connector at the transfer case.
   <LI type=1>Turn the ignition ON, with the engine OFF.
   <LI type=1>Install a scan tool.
   <LI type=1>Monitor the encoder channels P, B, A, and C on the scan tool.
   </LI>

Do any of the encoder channels indicate OFF.</P></TD>
<TD vAlign=center align=middle>


--</P></TD>
<TD vAlign=bottom align=middle>


Go to Step3 </P></TD>
<TD vAlign=bottom align=middle>


Go to Step4 </P></TD></TR>
<TR>
<TD vAlign=center align=middle><A name=S03>


3 </P></A></TD>
<TD vAlign=top align=left>


Test the encoder channel circuit that is indicating OFF on the scan tool for
a short to ground. Refer to <A
href="/servlets/CellHandler?CellId=62194&RefDoc=857757&evc=sm">Cir cuit
Testing</A> and <A
href="/servlets/CellHandler?CellId=61965&RefDoc=857757&evc=sm">Wir ing
Repairs</A> in Wiring Systems.</P>


Did you find and correct the condition?</P></TD>
<TD vAlign=center align=middle>


--</P></TD>
<TD vAlign=bottom align=middle>


Go to Step9 </P></TD>
<TD vAlign=bottom align=middle>


Go to Step8 </P></TD></TR>
<TR>
<TD vAlign=center align=middle><A name=S04>


4 </P></A></TD>
<TD vAlign=top align=left>


With the ignition in the OFF position, test the encoder low reference circuit
for a short to ground. Refer to <A
href="/servlets/CellHandler?CellId=62194&RefDoc=857757&evc=sm">Cir cuit
Testing</A> and <A
href="/servlets/CellHandler?CellId=61965&RefDoc=857757&evc=sm">Wir ing
Repairs</A> in Wiring Systems.</P>


Did you find and correct the condition?</P></TD>
<TD vAlign=center align=middle>


--</P></TD>
<TD vAlign=bottom align=middle>


Go to Step9 </P></TD>
<TD vAlign=bottom align=middle>


Go to Step5 </P></TD></TR>
<TR>
<TD vAlign=center align=middle><A name=S05>


5 </P></A></TD>
<TD>

1. <LI type=1>Turn the ignition ON with the engine OFF.
   <LI type=1>With the transfer case connector still disconnected, use the scan
   tool to clear DTCs. </LI>

Does DTC C0329 reset?</P></TD>
<TD vAlign=center align=middle>


--</P></TD>
<TD vAlign=bottom align=middle>


Go to Step8 </P></TD>
<TD vAlign=bottom align=middle>


Go to Step6 </P></TD></TR>
<TR>
<TD vAlign=center align=middle><A name=S06>


6 </P></A></TD>
<TD vAlign=top align=left>

1. <LI type=1>Turn the ignition OFF.
   <LI type=1>Connect the transfer case connector.
   <LI type=1>Turn the ignition ON, with the engine OFF.
   <LI type=1>With the transfer case shift control switch, command the transfer
   case through all of the modes.
   <LI type=1>Using a scan tool, check DTCs. </LI>

Does DTC C0329 set?</P></TD>
<TD vAlign=center align=middle>


--</P></TD>
<TD vAlign=bottom align=middle>


Go to Step7 </P></TD>
<TD vAlign=bottom align=middle>


Go to <A
href="/servlets/CellHandler?CellId=62111&RefDoc=857757&evc=sm">Tes ting
for Electrical Intermittents</A> in Wiring Systems </P></TD></TR>
<TR>
<TD vAlign=center align=middle><A name=S07>


7</P></A></TD>
<TD vAlign=top align=left>


Replace the encoder motor. Refer to <A
href="/servlets/CellHandler?CellId=69993&RefDoc=857757&evc=sm">Tra nsfer
Case Motor/Encoder Replacement</A> .</P>


Did you complete the repair?</P></TD>
<TD vAlign=center align=middle>


--</P></TD>
<TD vAlign=bottom align=middle>


Go to Step9 </P></TD>
<TD vAlign=bottom align=middle>


--</P></TD></TR>
<TR>
<TD vAlign=center align=middle><A name=S08>


8</P></A></TD>
<TD vAlign=top align=left>


Replace the transfer case shift control module. Refer to <A
href="/servlets/CellHandler?CellId=69989&RefDoc=857757&evc=sm">Tra nsfer
Case Shift Control Module Replacement</A> .</P>


Did you complete the repair?</P></TD>
<TD vAlign=center align=middle>


--</P></TD>
<TD vAlign=bottom align=middle>


Go to Step9 </P></TD>
<TD vAlign=bottom align=middle>


--</P></TD></TR>
<TR>
<TD vAlign=center align=middle><A name=S09>


9</P></A></TD>
<TD vAlign=top align=left>

1. <LI type=1>Use the scan tool in order to clear the DTCs.
   <LI type=1>Operate the vehicle within the Conditions for Running the DTC as
   specified in the supporting text. </LI>

Does the DTC set?</P></TD>
<TD vAlign=center align=middle>


--</P></TD>
<TD vAlign=bottom align=middle>


Go to Step1 </P></TD>
<TD vAlign=bottom align=middle>


System OK</P></TD></TR></TBODY></TABLE>
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