I unplugged both speed sensors(input and Output), the solenoid pack, took out the EATX fuse and relay under the hood and took out the transmission control fuse on the inside of the car to try and get the check engine light on and "force" the TCM to give me a code. I didn't get one. Does this mean that the TCM is bad?

Larry Ng is our Jeep Expert, plus he owns one and will be along shortly, but this may explain it on a different model. They share fuse boxes but not all have the EATX relay.

EATX Relay missing

ChryslerMinivan.net https://www.chryslerminivan.net > threads > eatx-relay...
EATX relay supplies power to the TCM and solenoid block; it's only used with a 4-speed transmission so yours is a 3-speed. There are other relay slots that ...

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In a Jeep, OBDII code P0700 indicates that the EATX (Transmission controller) has an active fault and has illuminated the MIL (Malfunction Indicator Lamp aka Check Engine light) via a BUS message. The specific fault must be acquired from the EATX via a DRBIII tool. So until you hook it up to a DRBIII scan tool, you really know what is wrong with your transmission. Input or Output Speed Sensor failures often cause this P0700 code and are a common failure part on Jeep Grand Cherokees. So take it to a dealer you trust or ask around for a transmission shop you could trust - they will have the DRBIII scan tool and you will pay them (in most cases) an hour's labor costs ($60-$100) to tell you what the internal codes are and what it MIGHT take to fix it. Or (this is what I would do), you can try replacing both Input and Output speed sensors yourself and see if that cures it. You will likely spend about $80-$100 on those 2 parts. The dealership will charge you about $180-$250 for those 2 parts plus another hour of labor to put them in. Good luck.

It depends. Are there codes in the computer now? Has it bee reset since you replaced the input speed sensor? If the codes are still in there, the transmission may still be in limp-in mode.

Your transmission is computer controlled. Trying to diagnose or repair it without the ability to interface with the computer that controls it about the same as surfing the internet with no monitor. If you push the right buttons and click your mouse just right, you might get to the page you are looking for (not likely, but possible). However, when you do get there, you still won't know it....

Sounds like a starter issue or the starter relay. The ETAX fuse is power to the transmission solenoids and Transmission computer.

CHRYSLER OBDII DTC

P1101 HCM/PCM Communication Performance

P1103 Turbocharger Waste Gate Actuator Malfunction

P1104 Turbocharger Waste Gate Solenoid Malfunction

P1105 Fuel Pressure Solenoid Malfunction

P1195 Slow Switching O2 Sensor Bank One Sensor One During catalyst monitoring

P1196 Slow Switching O2 Sensor Bank two Sensor one During catalyst monitoring

P1197 Slow Switching O2 Sensor Bank One Sensor two During catalyst monitoring

P1198 Radiator Temperature Sensor Input voltage too high

P1199 Radiator Temperature Sensor Input voltage too low

P1281 Engine is cold too long

P1282 Fuel Pump Relay control circuit

P1283 Idle select signal invalid

P1284 Fuel Injection pump battery voltage sensor out of range

P1285 Fuel Injection pump controller always on

P1286 Accelerator Position Sensor (APPS) supply voltage too high

P1287 Fuel Injection pump Controller Supply voltage low

P1288 Intake manifold short runner tuning valve solenoid circuit

P1289 Manifold tune valve solenoid circuit

P1290 CNG Fuel system pressure too high

P1291 No Temp rise seen from intake heaters

P1292 CNG Pressure sensor voltage too high

P1293 CNG Pressure sensor voltage too low

P1294 Target idle not reached

P1295 No 5 volts to TP sensor

P1296 No 5 volts to MAP sensor

P1297 No change in MAP sensor from start to run

P1298 lean operation at wide open throttle

P1299 Vacuum Leak detected (IAC fully seated)

P1300 Ignition timing adjustment circuit failure

P1388 Auto shutdown relay control circuit

P1389 No ASD relay output voltage at PCM

P1390 Timing belt skipped one tooth or more

P1391 Intermittent loss of CMP or CKP

P1398 Mis-Fire Adaptive Numerator at Limit (PCM is unable to learn the crank sensors signal

for use in preparation for misfire diagnostics

P1399 Wait to start lamp circuit

P1403 No 5 volt feed to EGR

P1475 Auxiliary 5 volt supply is too high

P1476 Too little secondary air

P1477 Too much secondary air

P1478 Battery Temp Sensor Volts out of limit

P1479 Transmission Fan Relay Circuit

P1480 PCV Solenoid Circuit

P1481 EATX (Electronic Automatic Transaxle) RPM pulse generator performance

P1482 Catalyst Temperature Sensor Circuit shorted low

P1483 Catalyst Temperature Sensor Circuit shorted high

P1484 Catalytic Converter overheat detected

P1485 Air injection solenoid circuit

P1486 EVAP Leak Monitor found a pinched hose

P1487 Hi Speed Fan #2 Circuit

P1488 Auxiliary 5 volt supply output is too low

P1489 High speed fan control relay circuit

P1490 Low speed fan control relay circuit

P1491 Radiator fan relay control circuit

P1492 Ambient/ Battery Temp sensor input voltage too high

P1493 Ambient/ Battery Temp sensor input voltage too low

P1494 Leak detection pump pressure switch or mechanical fault

P1495 Leak detection pump solenoid circuit

P1496 5 volt supply, output too low

P1498 High speed radiator fan ground control relay circuit

P1500 General alternator 'FR' Terminal circuit fault

P1594 Charging system voltage too high

P1595 Speed control solenoid circuits

P1596 Speed control switch always high

P1597 Speed control switch always low

P1598 A/C pressure sensor input voltage too high

P1599 A/C pressure sensor input voltage too low

P1680 Clutch released switch circuit

P1681 No I/P Cluster CCD/ J1850 messages received

P1682 Charging system voltage too low

P1683 Speed control servo power control circuit

P1684 The battery has been disconnected within the last 50 starts

P1685 The SKIM (Smart Key Immobilizer Module) has received an invalid key

P1686 No SKIM (Smart Key Immobilizer Module) bus message received

P1687 No Mechanical Instrument cluster bus message

P1688 Internal Fuel injection pump controller failure

P1689 No communication between the ECM and injection pump module

P1690 Fuel injection pump CKP sensor does not agree with the ECM CKP sensor

P1691 Fuel injection pump controller calibration error

P1692 Fault in companion Engine control module

P1693 A companion DTC was set in both the ECM and PCM

P1694 No CCD message from PCM- Aisin transmission

P1695 No CCD message from body control module

P1696 PCM failure EEPROM write denied

P1697 PCM Failure SRI (Service Reminder Indicator) mileage not stored

P1698 No CCD message from TCM

P1719 Skip shift solenoid circuit

P1740 TCC solenoid or overdrive solenoid performance

P1756 Governor pressure not equal to target at 15-20 psi

P1757 Governor pressure is above 3 PSI when 0 PSI is requested

P1762 Governor pressure sensor offset improper voltage

P1763 Governor pressure sensor voltage to high

P1764 Governor pressure sensor voltage to low
P1765 Transmission 12 volt supply relay control circuit

THERE MUST BE SOME FAULT CODES STORED IN TCM..WHEN A FAULT OCCURS,THE TCM SHUTS THE POWER FEED OFF TO THE SHIFT SOLENOIDS IN THE SOLENOID PACK SO ALL YOU HAVE IS SECOND GEAR(LIMP MODE)..IS YOUR SPEEDOMETER WORKING?IF NOT IT MAY BE THE OUTPUT SPEED SENSOR IS BAD..YOU SHOULD GET TCM SCANNED FOR FAULT CODES..I HOPE THIS HELPS

The input speed sensor is located just above the solenoid pack (with black cover and multiwire connector) on the transaxle and faces toward front of van. The output speed sensor is to the right of the input sensor about 6" or so. When the hood is open and you look straight down you'll see the solenoid pack. While a sensor could certainly cause the transaxle concern, an internal problem, electrical wiring, controller etc. can produce the same result. If the battery has ever had excessive corrosion/acid builud, it can leak down onto the harness located directly under the battery tray and this has been known to be a problem.

Which sensor? The solenoid pack is located on the front, under a black rubber cover, right under where the cooler lines go it. But this is only on the 4 speed Trans. If you have a three speed trans, there is no solenoid pack on the outside. Also the 3 speed does not have an input shaft or output shaft speed sensor, only a vehicle speed sensor.

May be the connection at the output speed sensor, it supplies vehicle speed signal to Trans module. Same signal used for speedo. Have seen wires break right at the sensor. U may also want to check those codes especially in the TCM. See if it gives u an output speed sensor code or gear ratio code. If either of these are present, it's probably in the output not input sensor circuit. With a wiring diagram, u could ohm the wires to the TCM and wiggle wires and connector to check for an open.

If you were to take the solenoid pack apart you would find a bad connection on that solenoid. You sill need a new pack installed.