98REDXJ2

I have a 98 cherokee. not my dd. I need to get it fixed already so I can sell it.

Ok so far I have replaced the TPS and the TCM and its still acting the same.

when taking off from a dead stop 1st gear winds out too much. If i get on it a bit and let off then resume accelerating right after it will shift into second i dont understand why its doing this and its racking my brain..

It is throwing the check engine light but I do not have a scan tool and it is not licenses to drive so I cant go to a parts store...

please try to help me out here guys..

caged

shift solenoids in the trans.

weebur

X2 on the 1-2 shift solenoid. Drop the trans pan and check the resistance through all three solenoids. They should be between 11-15 ohms. Check the solenoid's resistance from the male spade connector (wire disconnected) on the solenoid to its bracket (solenoid bolted in place).

98REDXJ2

yea thanks i posted the same thread on naxja and a guy linked me to a write up on changing selenoids. if i had an ohm meter id go test that today but.... lol.

first thing is i need it check with a scan tool before start pulling the pan off. thanks guys.

weebur

You'll probably show PO700/PO758 codes. You can pick up a digital meter at WalMart for less than $20. You may also want to adjust your TV cable before doing anything else. You also have the option to tell your buyer what is wrong and the he can probably fix it for less than $200 (if he's capable).

I'm pasting this from my notes on a similar issue that I was having, maybe it will help you if you want to check the solenoids without dropping the pan.

Trans Codes and Connectors (1997 AW-4)
10/22/12

In 1997 the TCM has the ability to communicate with the PCM. The TCM also has the ability to monitor transmission faults which could affect emissions. Any fault which could affect emissions will set a code in the PCM and will illuminate the MIL.

Trans harness connectors (at the firewall, passenger side)
Grey 6-way connector: Transmission Solenoid Connector
Grey 8-way connector: Transmission Range Sensor (TRS) (New for ’97 replaced the Park/Neutral Switch)

Trans Control Module (harness) Lock Facing Up
There are 26 cavities, two rows of 13.
Top Row, last 3 cavities on the right side
#11: Torque Converter Clutch. Wire: Dark Blue/White
#12. Shift Solenoid #1. Wire: White
#13. Shift Solenoid #2. Wire: Orange/White

TEST Key Off/Engine Off/Cold
Checking Resistance through Transmission Solenoid Connector (Transmission Side) 6-Way
Connector Lock @ 12 O’clock
Meter Leads Resistance: .4 ohms
Solenoids should read 11-15 ohms

Solenoid #3 (Closest to front of vehicle) Torque Converter Clutch (TTC) 6-way connector: lower middle (24.9 ohms-cold) Wire: White/Black. Engages TTC based on input from vehicle speed, TPS, and brake pedal while in 2nd, 3rd and 4th gears (not 1st gear).

Solenoid #1 (middle solenoid) 6-way connector: upper left (12.5 ohms-cold) Wire: Violet/White. This controls 1-2 and 3-4 shifts.

Solenoid #2 (Farthest to the rear) 6-way connector: lower left (28 ohms-cold) Wire: Dark Blue/White. This controls 2-3 shifts.

TEST
Trans Control Module (harness) Lock Facing Up
There are 26 cavities, two rows of 13.
Top Row, last 3 cavities on the right side
#11: Torque Converter Clutch. Wire: Dark Blue/White. Test: 72 ohms
#12. Shift Solenoid #1. Wire: White. Test: 59 ohms
#13. Shift Solenoid #2. Wire: Orange/White. Test: 75 ohms


TEST
Transmission Solenoid Connector (Transmission Side) 6-way
Test done after cleaning/adding dielectric grease to the PCM connectors, Trans Control Module Connector Harness and 6-way connector.
Checking Resistance through Transmission Solenoid Connector (Transmission Side) 6-way
Key Off/Engine Off.
Solenoid #3: 39.8 ohms-cold (before cleaning: 24.9)

Solenoid #1: 24.1 ohms-cold (before cleaning: 12.5)

Solenoid #2: 39.8 ohms-cold (before cleaning: 28)

10/21/12 (Actron CP9145 Scanner)
Two codes: PO753 MOD$18 Shift Solenoid A, Circuit Electrical
PO743 MOD$18 Torque Converter, Circuit Electrical

Week earlier: PO758 MOD$18 Shift Solenoid B, Circuit Electrical. CEL (MIL) appeared after taking off in higher gear from stop (Trans was in Drive). I cleared the code, it no longer appears. The only shifting problems during a week of daily driving was a hard downshift into first gear when coming to a stop, and at a stop the engine revved (in Drive) for a second or so then trans slammed into first gear.

Throttle Position Sensor
FSM: Center lead-back probed/Key On-Engine/Off
IDLE: Greater than .350v. Less than .900v
WOT: Less than 4.5v

Mine
IDLE: .979v (out of specification by .079v)
WOT: 4.11v
Voltage Swing: Smooth with analog meter

Brake Light Switch
Works properly

TV Cable
I adjusted the TV cable. Through the scanner it’s opening 100% with gas pedal to the floor. A check for codes showed two codes stored.