DTC P0742 L61
Circuit Description
The torque converter (TCC) clutch solenoid is a pulse width modulated solenoid.
When vehicle operating conditions are met for TCC application, the PCM begins the
duty cycle at approximately 42%. The PCM then increases the duty cycle up to 90% in
order to achieve full TCC apply. When the TCC solenoid is de-energized, the solenoid
blocks filtered 2-3 drive fluid, and allows TCC signal fluid to exhaust. When energized,
the solenoid modulates fluid into the TCC signal fluid circuit. When fully energized,
modulation stops, and the solenoid blocks both 2-3 drive fluid and TCC signal fluid
exhaust.
The TCC release switch is a normally closed switch. It signals the PCM the TCC
is released. Torque converter release fluid pressure acts on the switch contact, opening
the circuit. When the voltage on the circuit is high, the PCM recognizes the TCC is
no longer engaged.
Conditions for Setting the DTC
DTC P0742 will set if TCC Release Pressure Switch is closed for 4 seconds, 4
times within an ignition cycle when:
| • | TP Angle is greater than 12% |
| • | Transmission Range is Drive |
| • | Trans. Fluid Temp. is between: |
| - | MY 2002: 20°C (68°F) and 130°C (266°F) |
| - | MY 2003: 10°C (50°F) and 130°C (266°F) |
| • | Engine Torque is between: |
| - | MY 2002: 27 and 407 Nm (20 and 300 ft-lbs) |
| - | MY 2003: 27 and 237 Nm (20 and 175 ft-lbs) |
| • | No TP Angle DTCs have set |
| • | MY 2002: Vehicle Speed is between 32 and 97 km/h (20 and 60 mph) |
| • | MY 2002: Time since the last gear selector change is greater than 6 seconds |
| • | MY 2002: Engine Speed is between 500 and 6500 rpm |
| • | MY 2003: DTC P1860 has not set |
DTC P0742 diagnostic runs continuously.
MY 2002: DTC P0742 is a type A DTC.
MY 2003: DTC P0742 is a type B DTC.
Diagnostic Aids
Inspect and repair as necessary:
| • | TCC solenoid exhaust restricted. |
| • | TCC solenoid filter plugged. |
| • | TCC control valve stuck in the released position. |
| • | TCC regulated apply valve stuck in the released position. |
| • | TCC feed limit valve stuck. |
| • | Pressure regulator valve stuck. |
| • | TCC fluid circuit leaks. |
| • | TCC release switch for damaged or leaking seal, debris in switch, damaged
switch contacts, stuck switch contacts. |
DTC P0742
DTC P0742 L81
Circuit Description
The torque converter (TCC) clutch solenoid is a pulse width modulated solenoid.
When vehicle operating conditions are met for TCC application, the TCM begins the
duty cycle at approximately 42%. The PCM/TCM then increases the duty cycle up to 90%
in order to achieve full TCC apply. When the TCC solenoid is de-energized, the solenoid
blocks filtered 2-3 drive fluid, and allows TCC signal fluid to exhaust. When energized,
the solenoid modulates fluid into the TCC signal fluid circuit. When fully energized,
modulation stops, and the solenoid blocks both 2-3 drive fluid and TCC signal fluid
exhaust.
The TCC release switch is a normally closed switch. It signals the TCM the TCC
is released. Torque converter release fluid pressure acts on the switch contact, opening
the circuit. When the voltage on the circuit is high, the TCM recognizes the TCC is
no longer engaged.
Conditions for Setting the DTC
DTC P0742 will set if TCC Release Pressure Switch is closed for:
2 times within an ignition cycle when:
| • | Gear Ratio is between 0.61 to 1.09 |
| • | Trans. Fluid Temp. is between: |
| - | MY 2002: 21 and 130°C (70 and 266°F) |
| - | MY 2003: 10 and 130°C (50 and 266°F) |
| • | Engine Torque is between: |
| - | MY 2002: 30 and 300 Nm (22 and 221 ft-lbs) |
| - | MY 2003: 40 and 250 Nm (30 and 184 ft-lbs) |
| • | Engine Speed is between: |
| - | MY 2002: 200 and 7500 rpm for 5 seconds |
| - | MY 2003: 500 and 6500 rpm for 5 seconds |
| • | Vehicle Speed is between 15 and 255 km/h (9 and 158 mph) |
| • | MY 2002: Ignition 1 is between 8 and 18 volts |
| • | MY 2002: Time since the last gear selector change is greater than 6 seconds |
| • | No TP Angle DTCs have set |
| • | MY 2002: DTC P0502, P0503 and P1810 have not set |
| • | DTC P1860 and 1887 have not set |
DTC P0742 diagnostic runs continuously.
MY 2002: DTC P0742 is a type A DTC.
MY 2003: DTC P0742 is a type B DTC.
Diagnostic Aids
Inspect and repair as necessary:
| • | TCC solenoid exhaust restricted. |
| • | TCC solenoid filter plugged. |
| • | TCC control valve stuck in the released position. |
| • | TCC regulated apply valve stuck in the released position. |
| • | TCC feed limit valve stuck. |
| • | Pressure regulator valve stuck. |
| • | TCC fluid circuit leaks. |
| • | TCC release switch for damaged or leaking seal, debris in switch, damaged
switch contacts, stuck switch contacts. |
DTC P0742
