Question about 1997 Jeep Cherokee Country

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Lock up converter shudder ? when I apply reverse and 1st

It is a Grand Cherokee 1997 with a 42RE - 4 speed transmission. I just want to know how I can unlock the system in order to drive my car into trans-shop.

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If you can find the lead that operates the lockup solenoid in the transmission, you could cut it, but I would not recommend that. Likely the converter has an internal failure. Further operation can cause more fine metal (from broken part) contamination to circulate into transmission and damage can be costly!!!

Posted on Dec 17, 2008

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Transmission shudders at low speeds


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My 2001 jeep cherokee sport 4x4 transmission is failling, It didnt want to reverse unless i increase rpm's up to 5 or 6,000, then it skipped from 1st shift to 3rd shitf, also it shifts above 4,000...


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P0740 JEEP - Torque Converter Clutch Circuit
Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Transmission shift shock
- Vehicle may not shift into the highest gear

Possible causes
- 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

When is the code detected?
Torque Converter Clutch (TCC) unlocked for 10 sec., ECM commands converter lock-up and did not record engine speed drop.

P0740 JEEP Description
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.

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1 Answer

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