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<TD align=middle width="50%">Document ID# 828044
2003 HUMMER
H2 </TD>
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<H1>DTC P0740</H1>
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<H5>Circuit Description</A></H5>
The torque converter clutch (TCC) solenoid valve is an electrical device that
is used with the torque converter clutch pulse width modulation (TCCPWM)
solenoid valve in order to control TCC apply and release. The TCC solenoid valve
attaches to the transmission case assembly extending into the pump cover. The
TCC solenoid valve receives ignition voltage through the Ignition0 voltage
circuit. The powertrain control module (PCM) controls the solenoid by providing
the ground path on the TCC solenoid valve control circuit. The PCM monitors the
throttle position sensor voltage, the vehicle speed, and other inputs in order
to determine when to energize the TCC solenoid valve.</P>
When the PCM detects a continuous open, short to ground or short to power in
the TCC solenoid valve circuit, then DTCP0740 sets. DTCP0740 is a
typeBDTC.</P><A name=ss2-828044><A
href="http://127.0.0.1:9001/servlets/BlobShtml?ShtmlFile=828044&psdid=293&evc=sm#ss2-828044">
<H5>Conditions for Running the DTC</A></H5>
<UL type=BULLET>
<LI>The system voltage is 10-18volts.
<LI>The engine speed is greater than 450RPM for 5seconds.
<LI>The engine is not in fuel cutoff. </LI>[/list]<A name=ss3-828044><A
href="http://127.0.0.1:9001/servlets/BlobShtml?ShtmlFile=828044&psdid=293&evc=sm#ss3-828044">
<H5>Conditions for Setting the DTC</A></H5>
DTCP0740 sets if one of the following conditions occurs for
5seconds:</P>Condition 1
The PCM commands the solenoid ON and the voltage feedback remains high,
B+.</P>Condition 2
The PCM commands the solenoid OFF and the voltage feedback remains low,
0volt.</P><A name=ss4-828044><A
href="http://127.0.0.1:9001/servlets/BlobShtml?ShtmlFile=828044&psdid=293&evc=sm#ss4-828044">
<H5>Action Taken When the DTC Sets</A></H5>
<UL type=BULLET>
<LI>The PCM illuminates the malfunction indicator lamp (MIL) during the second
consecutive trip in which the Conditions for Setting the DTC are met.
<LI>The PCM inhibits TCC engagement.
<LI>The PCM inhibits 4th gear if the transmission is in hot mode.
<LI>The PCM freezes transmission adapt functions.
<LI>The PCM records the operating conditions when the Conditions for Setting
the DTC are met. The PCM stores this information as Freeze Frame and Failure
Records.
<LI>The PCM stores DTCP0740 in PCM history during the second consecutive
trip in which the Conditions for Setting the DTC are met. </LI>[/list]<A
name=ss1-651481><A
href="http://127.0.0.1:9001/servlets/BlobShtml?ShtmlFile=828044&psdid=293&evc=sm#ss1-651481">
<H5>Conditions for Clearing the MIL/DTC</A></H5>
<UL type=BULLET>
<LI>The PCM turns OFF the MIL during the third consecutive trip in which the
diagnostic test runs and passes.
<LI>A scan tool can clear the MIL/DTC.
<LI>The PCM clears the DTC from PCM history if the vehicle completes 40
warm-up cycles without an emission-related diagnostic fault occurring.
<LI>The PCM cancels the DTC default actions when the ignition switch is OFF
long enough in order to power down the PCM. </LI>[/list]<A name=ss5-828044><A
href="http://127.0.0.1:9001/servlets/BlobShtml?ShtmlFile=828044&psdid=293&evc=sm#ss5-828044">
<H5>Diagnostic Aids</A></H5>
With the TCC engaged, the TCC slip speed should be -20 to +50RPM.</P><A
name=ss6-828044><A
href="http://127.0.0.1:9001/servlets/BlobShtml?ShtmlFile=828044&psdid=293&evc=sm#ss6-828044">
<H5>Test Description</A></H5>
The numbers below refer to the step numbers on the diagnostic table.</P>
<A name=TD04>
<LI value=4>
This step tests for voltage to the solenoid.</P><A name=TD05>
<LI value=5>
This step tests the ability of the PCM and wiring to control the ground
circuit.</P><A name=TD07>
<LI value=7>
This step tests the resistance of the TCC solenoid valve and the automatic
transmission (AT) wiring harness assembly.</P></LI>
<TABLE width="100%" border=1></A><A name=tab7-828044><A
href="http://127.0.0.1:9001/servlets/BlobShtml?ShtmlFile=828044&psdid=293&evc=sm#tab7-828044">
<H4><FONT color=#254164>DTC P0740</FONT></H4></A>
<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=center align=middle><A name=S01>
1</P></A></TD>
<TD vAlign=top align=left>
Did you perform the Powertrain Diagnostic System Check?</P></TD>
<TD vAlign=center align=middle>
--</P></TD>
<TD vAlign=bottom align=middle>
Go to <A
href="http://127.0.0.1:9001/servlets/BlobShtml?ShtmlFile=828044&psdid=293&evc=sm#S02">Step
2</A> </P></TD>
<TD vAlign=bottom align=middle>
Go to <A
href="http://127.0.0.1:9001/servlets/CellHandler?CellId=30550&RefDoc=828044&evc=sm">Diagnostic
System Check - Engine Controls</A> in Engine Controls - 6.0L
(LQ4)</P></TD></TR>
<TR>
<TD vAlign=center align=middle><A name=S02>
2</P></A></TD>
<TD vAlign=top align=left>
<LI type=1>Install a scan tool.
<LI type=1>Turn ON the ignition, with the engine OFF.
<FONT color=brown>
<H4>Important</H4>
Before clearing the DTC, use the scan tool in order to record the
Freeze Frame and Failure Records. Using the Clear Info function erases
the Freeze Frame and Failure Records from the PCM.</P></FONT>
</P>
<LI type=1>Record the DTC Freeze Frame and Failure Records.
<LI type=1>Clear the DTC. </LI>
Are any of the following DTCs also set?</P>
<UL type=BULLET>
<LI>P0753
<LI>P0758
<LI>P0785
<LI>P1860 </LI>[/list]</TD>
<TD vAlign=center align=middle>
--</P></TD>
<TD vAlign=bottom align=middle>
Go to <A
href="http://127.0.0.1:9001/servlets/BlobShtml?ShtmlFile=828044&psdid=293&evc=sm#S03">Step
3</A> </P></TD>
<TD vAlign=bottom align=middle>
Go to <A
href="http://127.0.0.1:9001/servlets/BlobShtml?ShtmlFile=828044&psdid=293&evc=sm#S04">Step
4</A> </P></TD></TR>
<TR>
<TD vAlign=center align=middle><A name=S03>
3</P></A></TD>
<TD vAlign=top align=left>
Inspect the IGN0 fuse for an open.</P>
Refer to <A
href="http://127.0.0.1:9001/servlets/CellHandler?CellId=62113&RefDoc=828044&evc=sm">Circuit
Protection - Fuses</A> in Wiring Systems.</P>
Is the fuse open?</P></TD>
<TD vAlign=center align=middle>
--</P></TD>
<TD vAlign=bottom align=middle>
Go to <A
href="http://127.0.0.1:9001/servlets/BlobShtml?ShtmlFile=828044&psdid=293&evc=sm#S09">Step
9</A> </P></TD>
<TD vAlign=bottom align=middle>
Go to <A
href="http://127.0.0.1:9001/servlets/BlobShtml?ShtmlFile=828044&psdid=293&evc=sm#S04">Step
4</A> </P></TD></TR>
<TR>
<TD vAlign=center align=middle><A name=S04>
4 (http://127.0.0.1:9001/servlets/BlobShtml?ShtmlFile=828044&psdid=293&evc=sm#TD04)
</P></A></TD>
<TD vAlign=top align=left>
<LI type=1>Turn OFF the ignition.
<LI type=1>Disconnect the AT inline 20-way connector, additional DTCs
may set.
<LI type=1>Install the <A
href="http://127.0.0.1:9001/servlets/RetrieveTif?pic=537322">J
44152</A> Jumper Harness (20 pins) on the engine side of the AT inline
20-way connector.
<LI type=1>Turn ON the ignition, with the engine OFF.
<LI type=1>Using the <A
href="http://127.0.0.1:9001/servlets/RetrieveTif?pic=8917">J
35616-A</A> GM Terminal Test Kit, connect a test lamp from
terminalE of the <A
href="http://127.0.0.1:9001/servlets/RetrieveTif?pic=537322">J
44152</A> to ground. Refer to <A
href="http://127.0.0.1:9001/servlets/CellHandler?CellId=75943&RefDoc=828044&evc=sm">Automatic
Transmission Inline 20-Way Connector End View</A> . </LI>
Does the test lamp illuminate?</P></TD>
<TD vAlign=center align=middle>
--</P></TD>
<TD vAlign=bottom align=middle>
Go to <A
href="http://127.0.0.1:9001/servlets/BlobShtml?ShtmlFile=828044&psdid=293&evc=sm#S05">Step
5</A> </P></TD>
<TD vAlign=bottom align=middle>
Go to <A
href="http://127.0.0.1:9001/servlets/BlobShtml?ShtmlFile=828044&psdid=293&evc=sm#S12">Step
12</A> </P></TD></TR>
<TR>
<TD vAlign=center align=middle><A name=S05>
5 (http://127.0.0.1:9001/servlets/BlobShtml?ShtmlFile=828044&psdid=293&evc=sm#TD05)
</P></A></TD>
<TD vAlign=top align=left>
<LI type=1>Connect the test lamp from terminalE to terminalT
of the <A
href="http://127.0.0.1:9001/servlets/RetrieveTif?pic=537322">J
44152</A> . Refer to <A
href="http://127.0.0.1:9001/servlets/CellHandler?CellId=75943&RefDoc=828044&evc=sm">Automatic
Transmission Inline 20-Way Connector End View</A> .
<LI type=1>Use the scan tool in order to command the TCC solenoid valve
ON and OFF three times. </LI>
Does the test lamp turn ON and OFF with each command?</P></TD>
<TD vAlign=center align=middle>
--</P></TD>
<TD vAlign=bottom align=middle>
Go to <A
href="http://127.0.0.1:9001/servlets/BlobShtml?ShtmlFile=828044&psdid=293&evc=sm#S07">Step
7</A> </P></TD>
<TD vAlign=bottom align=middle>
Go to <A
href="http://127.0.0.1:9001/servlets/BlobShtml?ShtmlFile=828044&psdid=293&evc=sm#S06">Step
6</A> </P></TD></TR>
<TR>
<TD vAlign=center align=middle><A name=S06>
6</P></A></TD>
<TD vAlign=top align=left>
Is the test lamp always ON?</P></TD>
<TD vAlign=center align=middle>
--</P></TD>
<TD vAlign=bottom align=middle>
Go to <A
href="http://127.0.0.1:9001/servlets/BlobShtml?ShtmlFile=828044&psdid=293&evc=sm#S13">Step
13</A> </P></TD>
<TD vAlign=bottom align=middle>
Go to <A
href="http://127.0.0.1:9001/servlets/BlobShtml?ShtmlFile=828044&psdid=293&evc=sm#S14">Step
14</A> </P></TD></TR>
<TR>
<TD vAlign=center align=middle><A name=S07>
7 (http://127.0.0.1:9001/servlets/BlobShtml?ShtmlFile=828044&psdid=293&evc=sm#TD07)
</P></A></TD>
<TD vAlign=top align=left>
<LI type=1>Install the <A
href="http://127.0.0.1:9001/servlets/RetrieveTif?pic=537322">J
44152</A> on the transmission side of the AT inline 20-way connector.
<LI type=1>Using the DMM and the <A
href="http://127.0.0.1:9001/servlets/RetrieveTif?pic=8917">J
35616-A</A> , measure the resistance between terminalsT and E of
the <A
href="http://127.0.0.1:9001/servlets/RetrieveTif?pic=537322">J
44152</A> . Refer to <A
href="http://127.0.0.1:9001/servlets/CellHandler?CellId=75943&RefDoc=828044&evc=sm">Automatic
Transmission Inline 20-Way Connector End View</A> . </LI>
Does the resistance measure within the specified range?</P></TD>
<TD vAlign=center align=middle>
21-33ohms</P></TD>
<TD vAlign=bottom align=middle>
Go to <A
href="http://127.0.0.1:9001/servlets/BlobShtml?ShtmlFile=828044&psdid=293&evc=sm#S08">Step
8</A> </P></TD>
<TD vAlign=bottom align=middle>
Go to <A
href="http://127.0.0.1:9001/servlets/BlobShtml?ShtmlFile=828044&psdid=293&evc=sm#S15">Step
15</A> </P></TD></TR>
<TR>
<TD vAlign=center align=middle><A name=S08>
8</P></A></TD>
<TD vAlign=top align=left>
<LI type=1>Measure the resistance from terminalE of the <A
href="http://127.0.0.1:9001/servlets/RetrieveTif?pic=537322">J
44152</A> to ground.
<LI type=1>Measure the resistance from terminalT of the <A
href="http://127.0.0.1:9001/servlets/RetrieveTif?pic=537322">J
44152</A> to ground. </LI>
Do both readings measure greater than the specified value?</P></TD>
<TD vAlign=center align=middle>
250Kohms</P></TD>
<TD vAlign=bottom align=middle>
Go to <A
href="http://127.0.0.1:9001/servlets/CellHandler?CellId=30126&RefDoc=828044&evc=sm">Intermittent
Conditions</A> in Engine Controls - 6.0L (LQ4)</P></TD>
<TD vAlign=bottom align=middle>
Go to <A
href="http://127.0.0.1:9001/servlets/BlobShtml?ShtmlFile=828044&psdid=293&evc=sm#S15">Step
15</A> </P></TD></TR>
<TR>
<TD vAlign=center align=middle><A name=S09>
9</P></A></TD>
<TD vAlign=top align=left>
<FONT color=brown>
<H4>Important</H4>
The condition that affects this circuit may exist in other connecting
branches of the circuit. Refer to <A
href="http://127.0.0.1:9001/servlets/CellHandler?CellId=61979&RefDoc=828044&evc=sm">Power
Distribution Schematics</A> in Wiring Systems for complete circuit
distribution.</P></FONT>
</P>
Test the Ignition0 voltage circuit (CKT1020) of the TCC
solenoid valve for a short to ground between the fuse block and the AT
inline 20-way connector.</P>
Refer to <A
href="http://127.0.0.1:9001/servlets/CellHandler?CellId=62110&RefDoc=828044&evc=sm">Testing
for Short to Ground</A> and <A
href="http://127.0.0.1:9001/servlets/CellHandler?CellId=61965&RefDoc=828044&evc=sm">Wiring
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 <A
href="http://127.0.0.1:9001/servlets/BlobShtml?ShtmlFile=828044&psdid=293&evc=sm#S17">Step
17</A> </P></TD>
<TD vAlign=bottom align=middle>
Go to <A
href="http://127.0.0.1:9001/servlets/BlobShtml?ShtmlFile=828044&psdid=293&evc=sm#S10">Step
10</A> </P></TD></TR>
<TR>
<TD vAlign=center align=middle><A name=S10>
10</P></A></TD>
<TD vAlign=top align=left>
<FONT color=brown>
<H4>Important</H4>
The condition that affects this circuit may exist in other connecting
branches of the circuit. Refer to <A
href="http://127.0.0.1:9001/servlets/CellHandler?CellId=61979&RefDoc=828044&evc=sm">Power
Distribution Schematics</A> in Wiring Systems for complete circuit
distribution.</P></FONT>
</P>
Test the Ignition1 voltage circuit (CKT839) of the TCC
solenoid valve for a short to ground between the AT inline 20-way
connector and the TCC solenoid valve.</P>
Refer to <A
href="http://127.0.0.1:9001/servlets/CellHandler?CellId=62110&RefDoc=828044&evc=sm">Testing
for Short to Ground</A> in Wiring Systems.</P>
Did you find a short to ground condition?</P></TD>
<TD vAlign=center align=middle>
--</P></TD>
<TD vAlign=bottom align=middle>
Go to <A
href="http://127.0.0.1:9001/servlets/BlobShtml?ShtmlFile=828044&psdid=293&evc=sm#S15">Step
15</A> </P></TD>
<TD vAlign=bottom align=middle>
Go to <A
href="http://127.0.0.1:9001/servlets/BlobShtml?ShtmlFile=828044&psdid=293&evc=sm#S11">Step
11</A> </P></TD></TR>
<TR>
<TD vAlign=center align=middle><A name=S11>
11</P></A></TD>
<TD vAlign=top align=left>
<LI type=1>Test each solenoid for a short to ground.
<LI type=1>Replace the faulty solenoid as necessary. </LI>
Did you complete the replacement?</P></TD>
<TD vAlign=center align=middle>
--</P></TD>
<TD vAlign=bottom align=middle>
Go to <A
href="http://127.0.0.1:9001/servlets/BlobShtml?ShtmlFile=828044&psdid=293&evc=sm#S17">Step
17</A> </P></TD>
<TD vAlign=center align=middle>
--</P></TD></TR>
<TR>
<TD vAlign=center align=middle><A name=S12>
12</P></A></TD>
<TD vAlign=top align=left>
<FONT color=brown>
<H4>Important</H4>
The condition that affects this circuit may exist in other connecting
branches of the circuit. Refer to <A
href="http://127.0.0.1:9001/servlets/CellHandler?CellId=61979&RefDoc=828044&evc=sm">Power
Distribution Schematics</A> in Wiring Systems for complete circuit
distribution.</P></FONT>
</P>
Test the Ignition0 voltage circuit (CKT1020) of the TCC
solenoid valve for an open.</P>
Refer to <A
href="http://127.0.0.1:9001/servlets/CellHandler?CellId=62109&RefDoc=828044&evc=sm">Testing
for Continuity</A> and <A
href="http://127.0.0.1:9001/servlets/CellHandler?CellId=61965&RefDoc=828044&evc=sm">Wiring
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 <A
href="http://127.0.0.1:9001/servlets/BlobShtml?ShtmlFile=828044&psdid=293&evc=sm#S17">Step
17</A> </P></TD>
<TD vAlign=center align=middle>
--</P></TD></TR>
<TR>
<TD vAlign=center align=middle><A name=S13>
13</P></A></TD>
<TD vAlign=top align=left>
Test the control circuit (CKT422) of the TCC solenoid valve for a
short to ground between the PCM connector C2 and the AT inline 20-way
connector.</P>
Refer to <A
href="http://127.0.0.1:9001/servlets/CellHandler?CellId=62110&RefDoc=828044&evc=sm">Testing
for Short to Ground</A> and <A
href="http://127.0.0.1:9001/servlets/CellHandler?CellId=61965&RefDoc=828044&evc=sm">Wiring
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 <A
href="http://127.0.0.1:9001/servlets/BlobShtml?ShtmlFile=828044&psdid=293&evc=sm#S17">Step
17</A> </P></TD>
<TD vAlign=bottom align=middle>
Go to <A
href="http://127.0.0.1:9001/servlets/BlobShtml?ShtmlFile=828044&psdid=293&evc=sm#S16">Step
16</A> </P></TD></TR>
<TR>
<TD vAlign=center align=middle><A name=S14>
14</P></A></TD>
<TD vAlign=top align=left>
Test the control circuit (CKT422) of the TCC solenoid valve for
an open or short to power between the PCM connector C2 and the AT inline
20-way connector.</P>
Refer to <A
href="http://127.0.0.1:9001/servlets/CellHandler?CellId=62194&RefDoc=828044&evc=sm">Circuit
Testing</A> and <A
href="http://127.0.0.1:9001/servlets/CellHandler?CellId=61965&RefDoc=828044&evc=sm">Wiring
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 <A
href="http://127.0.0.1:9001/servlets/BlobShtml?ShtmlFile=828044&psdid=293&evc=sm#S17">Step
17</A> </P></TD>
<TD vAlign=bottom align=middle>
Go to <A
href="http://127.0.0.1:9001/servlets/BlobShtml?ShtmlFile=828044&psdid=293&evc=sm#S16">Step
16</A> </P></TD></TR>
<TR>
<TD vAlign=center align=middle><A name=S15>
15</P></A></TD>
<TD vAlign=top align=left>
Replace the AT wiring harness assembly, this includes the TCC solenoid
valve.</P>
Refer to <A
href="http://127.0.0.1:9001/servlets/CellHandler?CellId=6963&RefDoc=828044&evc=sm">Valve
Body and Pressure Switch Replacement</A> .</P>
Did you complete the replacement?</P></TD>
<TD vAlign=center align=middle>
--</P></TD>
<TD vAlign=bottom align=middle>
Go to <A
href="http://127.0.0.1:9001/servlets/BlobShtml?ShtmlFile=828044&psdid=293&evc=sm#S17">Step
17</A> </P></TD>
<TD vAlign=center align=middle>
--</P></TD></TR>
<TR>
<TD vAlign=center align=middle><A name=S16>
16</P></A></TD>
<TD vAlign=top align=left>
Replace the PCM.</P>
Refer to <A
href="http://127.0.0.1:9001/servlets/CellHandler?CellId=30267&RefDoc=828044&evc=sm">Powertrain
Control Module (PCM) Replacement</A> in Engine Controls - 6.0L (LQ4).</P>
Did you complete the replacement?</P></TD>
<TD vAlign=center align=middle>
--</P></TD>
<TD vAlign=bottom align=middle>
Go to <A
href="http://127.0.0.1:9001/servlets/BlobShtml?ShtmlFile=828044&psdid=293&evc=sm#S17">Step
17</A> </P></TD>
<TD vAlign=center align=middle>
--</P></TD></TR>
<TR>
<TD vAlign=center align=middle><A name=S17>
17</P></A></TD>
<TD>
Perform the following procedure in order to verify the repair:</P>
<LI type=1>Select DTC.
<LI type=1>Select Clear Info.
<LI type=1>Drive the vehicle in D4 with the TCC ON and OFF. Ensure that
the following conditions are met:
<UL type=BULLET>
<LI>The PCM commands the TCC solenoid valve ON, and the voltage
feedback drops to zero.
<LI>The PCM commands the TCC solenoid valve OFF, and the voltage
feedback increases to B+.
<LI>All conditions met for 5seconds. </LI>
<LI type=1>Select Specific DTC.
<LI type=1>Enter DTCP0740. </LI>[/list]
Has the test run and passed?</P></TD>
<TD vAlign=center align=middle>
--</P></TD>
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Go to <A
href="http://127.0.0.1:9001/servlets/BlobShtml?ShtmlFile=828044&psdid=293&evc=sm#S18">Step
18</A> </P></TD>
<TD vAlign=bottom align=middle>
Go to <A
href="http://127.0.0.1:9001/servlets/BlobShtml?ShtmlFile=828044&psdid=293&evc=sm#S02">Step
2</A> </P></TD></TR>
<TR>
<TD vAlign=center align=middle><A name=S18>
18</P></A></TD>
<TD vAlign=top align=left>
With the scan tool, observe the stored information, capture info, and
DTC Info.</P>
Does the scan tool display any DTCs that you have not diagnosed?</P></TD>
<TD vAlign=center align=middle>
--</P></TD>
<TD vAlign=bottom align=middle>
Go to <A
href="http://127.0.0.1:9001/servlets/CellHandler?CellId=30317&RefDoc=828044&evc=sm">Diagnostic
Trouble Code (DTC) List</A> in Engine Controls - 6.0L (LQ4)</P></TD>
<TD vAlign=bottom align=middle>
System OK</P></TD></TR></TBODY></TABLE>
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<TD align=middle width="50%">Document ID# 828044
2003 HUMMER
H2 </TD>
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