Re: PO 741 code? - Saab NG900 & OG9-3 Bulletin Board - Saabnet.com
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Re: PO 741 code?
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Posted by Drake [Email] (more from Drake) on Wed, 14 Nov 2012 14:19:52 Share Post by Email
In Reply to: PO 741 code?, milo, Sat, 10 Nov 2012 07:09:09
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http://www.saabnet.com/tsn/bb/9-5/index.html?bID=172379

Generic OBD Error Code Details for P0741
Torque Converter Clutch Circuit Performance or Stuck Off
What does this mean?
OBD Code P0741refers to
The torque converter clutch solenoid valve is activated, with the gear in D4, by the Transmission Control Module (TCM) in response to signals sent from the vehicle speed and the Engine Control Module (ECM). Lock-up piston operation will then be controlled. When the torque converter clutch solenoid valve is activated, the torque converter lockup clutch will engage creating a 1 to 1 RPM ratio between the transmission input shaft and the rotational speed of the torque converter. Lock-up operation, however, is prohibited when A/T fluid temperature is too low. When the accelerator pedal is depressed (less than 2/8) in lock-up condition, the engine speed should not change abruptly. If there is a big jump in engine speed, there is no lock-up.
Symptoms
Possible sumptoms of OBD code P0741
- Engine Light ON (or Service Engine Soon Warning Light)
Causes
Possible causes of OBD code P0741
- Low transmission fluid level - Dirty transmission fluid - Faulty torque converter clutch solenoid valve - Torque converter clutch solenoid valve harness or connectors - Torque converter clutch solenoid valve circuit is open or shorted - Transmission internal mechanical problem The Error code is generally activated on detection of the following conditions: Lock-up does not occur when driving in lock-up range or lockup remains ON in lock-up OFF range

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