DTC P0741 TCC System Stuck Off 5.7L and 7.4L Gas
Circuit Description
Important: DTC P0741 inspects for high TCC slip in 2nd and 3rd gear only. The transmission
must be in hot mode or experiencing a wide open throttle maneuver in order
for the TCC apply to occur in 2nd and 3rd gear.
The VCM energizes the Torque Converter Clutch Pulse Width Modulated
Solenoid Valve by creating a ground path on circuit 422. When the VCM grounds
(energizes) the TCC PWM Sol. Valve, the TCC PWM Sol. Valve stops the converter
signal oil from exhausting. This causes the converter signal oil pressure
to increase and shift the TCC valve. The TCC PWM Sol. Valve will de-energize
when the VCM no longer provides a ground path. When the TCC PWM Sol. Valve
is de-energized, the TCC PWM Sol. Valve exhausts fluid and releases the TCC.
When the VCM detects high torque converter slip when the TCC is commanded
ON, then DTC P0741 sets. DTC P0741 is a type D DTC. For California emissions
vehicles DTC P0741 is a type A DTC.
Conditions for Setting the DTC
| • | No TP Sensor DTCs P0121 or P0122. |
| • | No ISS Sensor DTCs P0716 or P0717. |
| • | No TCC DTCs P0742 or P1860. |
| • | No TFP Val. Position Sw. DTC P1810. |
| • | The engine must be running for at least 5 seconds. |
| • | The gear ratio must indicate 2nd, 3rd or 4th gear. |
| • | The Throttle Position is 10-80% (15-80% for 4.3L). |
| • | The TFP Val. Position Sw. must be in D4, D3 or D2. |
| • | The transmission fluid temperature must be -10 to 150°C
(14-302°F). |
| • | The TCC slip speed is greater than 65 RPM for 4 seconds. |
| • | All conditions must be met for a total of 2 occurrences. |
Action Taken When the DTC Sets
| • | The VCM inhibits the TCC. |
| • | The VCM inhibits 4th gear. |
| • | The VCM illuminates the Malfunction Indicator Lamp (MIL) for California
emissions vehicles. |
Conditions for Clearing the DTC
| • | For California emissions, the VCM turns OFF the MIL after three
consecutive ignition cycles without a failure reported. |
| • | A scan tool can clear the DTC from the VCM history. The VCM clears
the DTC from the VCM history if the vehicle completes 40 warm-up cycles without
a failure reported. |
| • | The VCM cancels the DTC default actions when the fault no longer
exists and the ignition is OFF long enough in order to power down the VCM. |
Diagnostic Aids
| • | Inspect the wiring for poor electrical connections at the VCM.
Inspect the wiring for poor electrical connections at the transmission 20-way
connector. Look for the following conditions: |
| - | A broken wire inside the insulation |
| • | First diagnose and clear any engine DTCs or TP Sensor codes that
are present. Then inspect for any transmission DTCs that may have reset. |
DTC P0741 TCC System Stuck Off (5.7L and 7.4L Gas)
Step
| Action
| Value(s)
| Yes
| No
|
1
| Was the
Powertrain On-Board Diagnostic (OBD) System Check performed?
| --
|
Go to Step 2
| Go to
Powertrain On Board Diagnostic (OBD) System Check
|
2
|
- Install the scan tool (tech 1)
®.
Important: Before clearing the DTCs, use the scan tool in order to record the Freeze
Frame and Failure Records for reference. The Clear Info function will erase
the data.
- Drive the vehicle in D3 in 3rd gear.
- Record the data using snapshot mode.
Is the TCC snapshot data greater than the specified value when the TCC
solenoid is commanded ON (greater than 95%) for greater than 4 seconds?
| 65 RPM
|
Go to Step 3
| Go to Diagnostic Aids
|
3
| The TCC PWM Sol. Valve is mechanically stuck OFF.
Refer to
No Torque Converter Clutch Apply
in this section.
Did you find a condition?
| --
|
Go to Step 5
|
Go to Step 4
|
4
|
- Inspect for the Torque Converter being mechanically stuck OFF.
- Inspect the following components:
| • | TCC damaged exhaust orifice. |
| • | Torque Converter for possible damage. |
| • | Converter apply valve stuck in the off (release) position. |
| • | Possible mis-aligned or damaged valve body gasket. |
| • | Restricted apply or release passage. |
Refer to On-Vehicle Service.
Did you find and correct a condition?
| --
|
Go to Step 5
| --
|
5
| In order to verify your repair, perform the following procedure:
- Select DTC.
- Select Clear Info.
- Operate the vehicle under the following conditions:
| • | Drive the vehicle in D4 with steady acceleration and TP over 12%. |
| • | The VCM must see a TCC slip of less than 20 RPM for 10 seconds. |
- Select Specific DTC. Enter DTC P0741.
Has the test run and passed?
| --
| System OK
|
Begin the diagnosis
again. Go to Step 1
|
