4x4 won't engage??
….
Post Fiend
Joined: Jun 2006
Posts: 5,497
Likes: 7
From: Central, Al
Have any codes been set? I would start with that but just some things to check are the switch itself and the harness connection on the t'fer case here is the symptom chart
Symptom Chart — Electronic Shift
<TABLE cellSpacing=0 cellPadding=3 rules=groups width="90%" border=1><CAPTION>Symptom Chart </CAPTION><COLGROUP><COLGROUP><COLGROUP><TBODY><TR>< TH>Condition </TH><TH>Possible Sources </TH><TH>Action </TH></TR><TBODY></TBODY><TBODY><TR vAlign=top><TD>
Symptom Chart — Electronic Shift
<TABLE cellSpacing=0 cellPadding=3 rules=groups width="90%" border=1><CAPTION>Symptom Chart </CAPTION><COLGROUP><COLGROUP><COLGROUP><TBODY><TR>< TH>Condition </TH><TH>Possible Sources </TH><TH>Action </TH></TR><TBODY></TBODY><TBODY><TR vAlign=top><TD>
- No communication with the generic electronic module (GEM)
- GEM.
- Central junction box (CJB).
- CJB fuse 15 (5A).
- Circuitry.
- GO to Pinpoint Test D .
- The vehicle does not shift between 2WD and 4X4 HIGH correctly
- Battery junction box (BJB) fuse 104 (30A).
- Mode select switch (MSS).
- Transfer case shift relays.
- Contact plate A, B, C, or D.
- Gearmotor encoder assembly.
- Circuitry.
- GEM.
- Transfer case mechanism.
- GO to Pinpoint Test E .
- The vehicle does not shift between 4X4 HIGH and 4X4 LOW modes correctly
- PDB fuse 104 (30A).
- MSS.
- Park/neutral position switch.
- Brake pedal position (BPP) switch.
- GEM.
- Transfer case.
- Digital transmission range (TR) sensor.
- Anti-lock brake control (ABS) module.
- Circuitry.
- GO to Pinpoint Test F .
- The front axle is not engaging correctly
- CJB fuse 6 (15A).
- Pulse vacuum hublock (PVH) solenoid.
- GEM.
- Circuitry.
- Vacuum lines.
- Hublocks.
- Hub and bearing.
- GO to Pinpoint Test G .
- The 4X4 indicator is always on—four wheel drive system operates correctly
- ABS module.
- Circuitry.
- Instrument cluster.
- GEM.
- GO to Pinpoint Test H .
- The LOW RANGE indicator is always on
- PCM.
- Circuitry.
- Instrument cluster.
- GEM.
- GO to Pinpoint Test I .
Last edited by Uzumati; Aug 13, 2006 at 06:31 AM.
Post Fiend
Joined: Oct 2003
Posts: 5,903
Likes: 1
From: MICHIGAN
After the fuses, The likely suspect is the shift motor on the backside of the transfer case.
You can remove the motor from the tranfer case and have someone turn the switch in the cab. Look at the back of the motor for movement.
You can remove the motor from the tranfer case and have someone turn the switch in the cab. Look at the back of the motor for movement.
Last edited by Cuda_jim; Aug 13, 2006 at 06:50 AM.
