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Jerry
Jerry, Master Mechanic
Category: Dodge
Satisfied Customers: 1754
Experience:  ASE Master tech, 30 years exp. troubleshooter, driveability tech
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I have a 97 Ram 1500 2WD. New trans, pressure in lines

Customer Question

I have a 97 Ram 1500 2WD. New trans, pressure in lines checked, visually inspected all wires, cleaned and tightened all ground connections and a new computer. why am I getting a 0740 code (TCC) at low speeds. There is a little engine vibration. Could it be a miss match on the Torque converter?
Submitted: 1 year ago.
Category: Dodge
Expert:  -Brad- replied 1 year ago.

The code you have is no rpm drop at lockup.. Have you replaced the converter yet?

Expert:  -Brad- replied 1 year ago.

STEP 1): DIAGNOSTIC TEST: See test procedure in the applicable Powertrain Diagnostic Procedures Manual. The test procedure may recommend torque converter clutch (TCC) engagement test. This test can distinguish between an electrical problem and a hydraulic / mechanical problem. TCC STALL TEST RESULTS: If TCC engagement test stalls the engine fully the trouble code is being caused by an electrical issue. If TCC engagement test drops the engine rpm but does not stall the engine fully the trouble code is being caused by an internal mechanical or hydraulic issue. NOTE: TCC engagement test not available on models with TH / RH auto trans. STEP 2): BATTERY AND CABLES: Check battery condition and battery cable connections. Check main ground circuit for the PCM. Repair loose or corroded connections. If dual batteries are used verify batteries are properly matched and are in good operating condition. STEP 3): GENERATOR: Generator and / or generator wiring harness may produce excessive radio frequency interference (RFI). Excessive RFI can interfere with PCM operation. Evaluate condition with generator wiring harness disconnected. If the condition stops insulate the generator wiring harness with tape or wrap that will prevent RFI (obtain locally). Replace generator if condition persists. MODELS WITH CUMMINS DIESEL ENGINE: Evaluate condition with fuel transfer pump electrical connector unplugged. Fuel transfer pump may also produce excessive RFI. If condition stops replace the fuel transfer pump. STEP 4): CIRCUIT WIRING: Check TCC solenoid circuit wiring and connectors. Check for shorts to power or ground or chafing (rub-through). Check circuit wiring inside trans pan area. Check for electrical add-on equipment that may cause the condition being addressed. To test ciruit wiring for high resistance suggest use headlamp or fog lamp to place load on the circuit being checked. Circuits with high resistance may illuminate a test lamp normally but a larger lamp will be very dim. STEP 5): TCC SOLENOID: If no circuit wiring problems are found replace the torque converter clutch solenoid. STEP 6): VALVEBODY: If condition persists remove and inspect valvebody assembly for stuck valves / cracks / damage / uneven mating surfaces / loose retaining screws / other. Check all mating surfaces with a precision straight edge tool. Clean and recondition valvebody assembly as required. Torque all screws to proper specification. Replace valvebody assembly if necessary. NOTE: TSB 21-11-00 applies to 2000 - 2001 (AB / AN / BR / BE / DN) models built before 08/01/00. Procedure involves minor modification to the valvebody assembly for P1740 trouble code. STEP 7): PUMP ASSEMBLY: If condition persists replace trans pump assembly / input shaft with seal rings / torque converter. END OF PROCEDURE

Customer: replied 1 year ago.
New trans and torque converter
Customer: replied 1 year ago.
When i erase the code the check engine light comes on in about a week. if I drive it every day
Expert:  -Brad- replied 1 year ago.

I have attached the diagnostic test for the P0740 that will need to be followed..

Let me know what you find,

Brad