Mechanics

TRANSMISSION SHUDDER AND P07

1999 Chrysler Town and Country

Transmission problem
1999 Chrysler Town and Country 6 cyl Two Wheel Drive Automatic 169000 miles

My father's Dodge has been having some transmission difficulties, and I am trying to decide where to go next.
In the speed ranges of 40 to 55 mph, the transmission shifts in and out of overdrive to drive and creates a shudder in the vehicle. Speeds above and below that it is fine. Also a couple of weeks ago the engine would die as soon he put it in gear, but that problem remedied itself the very same day. (Lock-up torque converter?) The transmission has fault codes of P0700 and P0736. With the number of miles on the van, I am afraid it is the sign of a dying transmission, but if it is the PCM or a snsor or relay I would like to go there first. I am going to drive 450 miles to help him out later in the week, any expeditied help would be appreciated. Many thanks!
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Vwcrewcab
March 23, 2010.



Hello. Thanks for the donation. Much appreciated

DTC P0604, P0605, P0700: INTERNAL TRANS CONTROLLER
Possible Causes
Internal TCM failure.
Diagnostic Procedure
Using scan tool, check Global Good Trip (GGT) counter. If GGT counter displays 3 trips or less, replace TCM. If GGT counter displays more than 3 trips, go to next step.
Record all DTCs and one trip failures. Using scan tool, erase DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES. Turn ignition from off to on, then start engine. Apply brakes. Slowly move shift lever through each gear position. Check if DTC P0604, P0605 and/or P0700 has reset. If DTC P0604, P0605 and/or P0700 is present, replace TCM. If DTC P0604, P0605 and/or P0700 is not present, go to next step.
Inspect the following for pushed out terminals or faulty connections and repair as necessary: Engine Ground Connections
TCM Grounds
TCM Battery Feed
TCM Fused Ignition Switch Output Circuit
Power Feed To Transmission Control Relay
If procedure in previous step fails to diagnose problem, erase DTCs using scan tool. Set GTC counter to zero. Perform VER-1A: VERIFICATION TEST. If transaxle is still not functioning correctly, go to next step. If transaxle is functioning correctly, test is complete.
NOTE: Low battery voltage can be a source of many non-DTC symptoms.

Inspect battery voltage. Ensure battery is fully charged. Correct as needed. Perform VER-1A: VERIFICATION TEST. If battery voltage is okay, see TROUBLE SHOOTING in CHRYSLER 41TE/AE & MITSUBISHI F4AC1 OVERHAUL article.
DTC P0736: GEAR RATIO ERROR IN REVERSE
Possible Causes
Low battery voltage
Reverse pressure less than 180 PSI (12.7 kg/cm2 )
Leaking L-R seals.
L-R switch valve stuck in 1st gear position.
Diagnostic Procedure
Using scan tool, check Global Good Trip (GGT) counter. If GGT counter displays 3 trips or less, go to step 3. If GGT counter displays more than 3 trips, go to next step.
Record all DTCs and one trip failures. Using scan tool, erase DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES. Run engine in " N" for one minute. Drive vehicle in each gear (" R", " 1", " 2", " 3" and " 4" ) for 30 seconds (minimum). Check if DTC P0736 has reset. If DTC P0736 is present, go to next step. If DTC P0736 is not present, go to step 15.
Perform SHIFT LEVER system test using scan tool. If system passes, go to next step. If system does not pass, DTC P0705: CHECK SHIFTER SIGNAL.
If DTC P1791 is preset, perform DTC P1791: LOSS OF PRIME. If DTC P1791 is not present, go to next step.
If DTCs P0715, P0720 or P1794 are also set, perform DTC P0715 & P0720: INPUT SPEED SENSOR ERROR/OUTPUT SPEED SENSOR ERROR and/or DTC P1794: SENSOR GROUND ERROR as required. If DTCs P0715, P0720 or P1794 are not present, go to next step.
Select RPM display on scan tool. Raise and support vehicle. Place gearshift lever in " P" position. Start engine and apply service brakes. Observe scan tool display. If both input and output speed values on scan tool display are greater than zero RPM, perform DTC P0715 & P0720: INPUT SPEED SENSOR ERROR/OUTPUT SPEED SENSOR ERROR. If scan tool display is not as specified, go to next step.
Place gearshift lever in " R" position. Release brakes. Increase engine speed to 2000 RPM. If wheels rotate, go to next step. If wheels do not rotate, go to step 9.
If input and/or output speed remains at zero RPM, perform DTC P0715 & P0720: INPUT SPEED SENSOR ERROR/OUTPUT SPEED SENSOR ERROR.
Place gearshift lever in " P" position. Turn engine off. Connect a 300 psi (21 kg/cm2 ) pressure gauge to reverse pressure test port. Connect an additional 300 psi (21 kg/cm2 ) pressure gauge to L-R pressure test port. See TESTING in CHRYSLER 41TE/AE & MITSUBISHI F4AC1 OVERHAUL article. Start engine. Place gearshift lever in " R" position. Increase engine speed to 2000 RPM. Observe pressure gauges. If reverse pressure is less than 180 psi (12.7 kg/cm2 ) at 2000 RPM, overhaul transmission. See CHRYSLER 41TE/AE & MITSUBISHI F4AC1 OVERHAUL article. If reverse pressure is not as specified, go to next step.
If L-R pressure is less than 180 psi (12.7 kg/cm2 ) at 2000 RPM, go to next step. If L-R pressure is not as specified, go to step 13.
Remove valve body and separate valve body halves. See CHRYSLER 41TE/AE & MITSUBISHI F4AC1 OVERHAUL article. Inspect valve body. Check if L-R switch valve is stuck in 1st gear position. If switch valve is stuck, repair or replace valve body as necessary. If switch valve is not stuck, go to next step.
Inspect L-R accumulator seals. If ends of seals are welded together, replace L-R accumulator seals. If ends of seals are not welded together, repair faulty internal transmission components as necessary.
Using scan tool, perform REVERSE CLUTCH PRESSURE test. Apply service brakes firmly. Depress throttle to 30 degrees and observe turbine speed on scan tool display. If test passes, go to next step. If test does not pass, overhaul transmission. See CHRYSLER 41TE/AE & MITSUBISHI F4AC1 OVERHAUL article.
If customer complaint is an intermittent no Reverse condition, overhaul transmission. See CHRYSLER 41TE/AE & MITSUBISHI F4AC1 OVERHAUL article. If customer complaint is not as specified, conditions required to set DTC P0736 do not currently exist.
Inspect the following for pushed out terminals or faulty connections: Engine Ground Connections
TCM Grounds
TCM Battery Feed
TCM Fused Ignition Switch Output Circuit
Power Feed To Transmission Control Relay
Repair as necessary. If all connections are okay, inspect TCM connector pins 13, 14 and 52. Inspect possible intermittent clutch or accumulator seal performance. Perform HYDRAULIC PRESSURE TESTS in CHRYSLER 41TE/AE & MITSUBISHI F4AC1 OVERHAUL article. Check input and output speed sensor harness connectors. Repair as necessary.
If procedure in previous step fails to diagnose problem, erase DTCs using scan tool. Set GTC counter to zero. Perform VER-1A: VERIFICATION TEST. If transaxle is still not functioning correctly, go to next step. If transaxle is functioning correctly, test is complete.
NOTE: Low battery voltage can be a source of many non-DTC symptoms.

Inspect battery voltage. Ensure battery is fully charged. Correct as needed. Perform VER-1A: VERIFICATION TEST. If battery voltage is okay, see TROUBLE SHOOTING in CHRYSLER 41TE/AE & MITSUBISHI F4AC1 OVERHAUL article.

Dave H
Mar 23, 2010.