1998 Plymouth Voyager service engine soon light

ERIC_100

MEMBER
1998 PLYMOUTH VOYAGER
6 CYL
FWD
AUTOMATIC
145,000 MILES

My service engine soon light has come on and I am past due for a smog. I get two trouble codes, P0700 and P0740. The engine is the 3.3L V-6. I do not seem to be having any trouble with my transmission which makes me think that my solenoid is bad and needs to be replaced. The transmission was rebuilt at 90,000 miles some time ago by a local shop. Through some investigation, I have been told to trouble shoot the solenoid it must have 10 volts across its leads when the key is on and with the key off it should measure 30 to 50 ohms. How do you take this unit off the torque converter and where is it located? I have looked at where I thought it would be located and there are several wires to connectors in the area of the transmission/torque converter. I have asked or local Chrysler dealership and they were less than helpful telling me they have all their information on handheld units and could not copy any information for me about trobleshooting or showing me the location of the unit. Do you have any other thoughts about this problem?

5 Replies

BMRFIXIT

MECHANIC
19,053 POSTS

Code P0700 telling u have tranny issue and need to be checked
code P0740
this is what I have on IT

NOTE: After performing any repairs, perform powertrain verification test

DTC P0740: TORQ CON CLU, NO RPM DROP AT LOCK-UP
Circuit Description
DTC P0740 will set if torque converter does not lock up or unlock properly. This DTC may also set if vehicle is driven over mountainous terrain. Possible causes: open fused ignition switch output circuit, faulty or stuck TCC solenoid, faulty torque converter, dirty transmission fluid, low transmission fluid level, or non-standard vehicle configuration.

Diagnostic Procedure

1. Turn ignition on. Using scan tool, read DTCs. If GLOBAL GOOD TRIP is displayed and is equal to zero, go to next step. If GLOBAL GOOD TRIP is not displayed or is not equal to zero, tests is complete.

2. Turn ignition off. Tee in a 300 psi (21 kg/cm2 ) pressure gauge to transmission oil cooler inlet line. Ensure pressure gauge hose is long enough so gauge can be monitored during test drive. Test drive vehicle in Drive at 50 MPH while monitoring scan tool and pressure gauge. Pressure gauge should indicate about 15 psi (1.0 kg/cm2 ) until lock-up is achieved. As scan tool indicates lock-up, pressure gauge reading should jump. If operation is as specified, go to next step. If operation is not as specified, torque converter or TCC solenoid is faulty. Repair as necessary.

3. Turn ignition off. Check transmission fluid for improper level or for presence of any debris. Repair as necessary. If transmission fluid level and condition are okay, go to next step.

4. Turn ignition off. Disconnect TCC solenoid harness connector. Turn ignition on. Using scan tool, measure voltage on fused ignition switch output circuit at TCC solenoid harness connector. If voltage is greater than 10 volts, go to next step. If voltage is not greater than 10 volts, repair open circuit.

5. Turn ignition off. Measure resistance of TCC solenoid. If resistance is 30-50 ohms, go to next step. If resistance is not as specified, replace TCC solenoid.

6. Test drive vehicle and maintain 50 MPH as indicated on scan tool. Achieve lock-up and wait 10 seconds. Record engine RPM. If engine speed was 2150-2250 RPM, go to next step. If engine RPM was not as specified, differential, output shaft or gear train is most likely at fault. Repair as necessary.

7. Turn ignition off. Remove Vehicle Speed Sensor (VSS). Inspect for damage. Ensure front tires are correct size for vehicle. Repair as necessary. If no problems are found, test is complete.

8/2/2008

good luck