Circuit Description
The Torque Converter Clutch Solenoid Valve (TCC Sol Valve) acts on the
hydraulic fluid, controlling TCC apply and release.
When the PCM detects 3 occurrences of TCC slip is -20 to +25 RPM
for 5 seconds when the TCC is commanded OFF, then DTC P0742 sets. DTC P0742
is a type B DTC.
Conditions for Setting the DTC
| • | No TP DTCs P0122 or P0123. |
| • | No VSS DTCs P0502 or P0503. |
| • | No TCC PWM solenoid electrical DTC P1860. |
| • | No TCC enable solenoid electrical DTC P0740. |
| • | The engine speed is more than 500 RPM for 5 seconds. |
| • | The PCM has commanded the TCC OFF. |
| • | The commanded gear is not 1st. |
| • | The transmission gear indicates 2nd, 3rd or 4th. |
| • | The throttle angle is between 14-50%. |
| • | The engine torque is 95-271 N·m (70-200 lb ft). |
| • | The TCC slip speed is -20 to +25 RPM, 3 occurrences for
5 seconds. |
| • | The engine speed is 800-4000 RPM. |
| • | The vehicle speed is 32-112 km/h (20-70 mph). |
| • | The last gear change occurred more than 3 seconds ago. |
Action Taken When the DTC Sets
The PCM illuminates the Malfunction Indicator Lamp (MIL) after two consecutive
trips with a failure reported.
Conditions for Clearing the DTC
| • | The PCM turns OFF the MIL after three consecutive ignition cycles
without a failure reported. |
| • | A scan tool can clear the DTC from the PCM history. The PCM clears
the DTC from the PCM history if the vehicle completes 40 warm-up cycles without
a failure reported. |
Diagnostic Aids
| • | Check for PRNDL DTC P0705. DTC P0705 affects transmission operation.
This may set DTC P0742 falsely. |
| • | Inspect the transmission fluid for debris. |
Test Description
The number below refers to the step number on the diagnostic table.
-
A TCC slip speed of -20 to +25 RPM indicates that this DTC is
current. Refer to the Diagnostic Aids. Inspect for PRNDL DTC P0705.
DTC P0742 Torque Converter Clutch System Stuck ON
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
®.
- With the engine OFF, turn the ignition switch to the RUN position.
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. Record the DTC Freeze Frame and Failure Records.
- Start and run the vehicle.
- Select TCC Slip Speed on the scan tool.
- With the transmission in D4, drive the vehicle through the 1-2
upshift.
In second gear is the TCC Slip Speed within the range specified?
| -20 to +25 RPM
|
Go to Step 3
| Go to Diagnostic Aids
|
3
| Inspect for the following conditions:
- The TCC enable solenoid stuck ON because of sediment.
- The TCC apply valve stuck ON because of sediment.
- The TCC Enable Valve Stuck on because of sediment or a bent or
sticking valve. Refer to Control Valve Body Assembly Inspection, Section 7.
Was a condition found and corrected?
| --
|
Go to Step 4
| --
|
4
| In order to verify your
repair, perform the following procedure:
- Select DTC.
- Select Clear Info.
- Operate the vehicle under the following conditions:
| • | The gear range is D2, D3 or D4. |
| • | The commanded gear is not 1st. |
| • | The engine speed is greater than 500 RPM for 5 seconds. |
| • | The engine torque is 95-270 N·m (70-200 lb ft). |
| • | The throttle position is 14-50%. |
| • | The PCM commands the TCC OFF. |
| • | The TCC slip speed is 150-2000 RPM for 5 seconds. |
| • | The engine speed is 800-4000 RPM. |
| • | The vehicle speed is 32-112 km/h (20-70 mph). |
| • | The last gear change occurred more than 3 seconds ago. |
- Select Specific DTC. Enter DTC P0742.
Has the test run and passed?
| --
| System
OK
|
Begin the diagnosis again. Go to Step 1
|
