1991 Mazda b2600i extra cab, 4x4 and the remote free wheel stopped working.

1991 MAZDA B2500

30,000 MILES

RETROSK8

MEMBER
4 POSTS
FOLLOW

Hey my name is Zac and i own a manual 1991 Mazda b2600i extra cab. At the end of winter my 4x4 stopped working and the remote free wheel (RFW) button went out (The light). I've been trying to figure out what the problem for awhile now. The transfer case engages and the drive shaft spins. So i'm guess that the Front diff might be the problem out the RFW is not working anymore. Can you help? BTW (30000 on engine and transmission)

Jun 17, 2012 at 7:13 AM

RETROSK8

MEMBER
4 POSTS

A 2600 not a 2500

Jun 17, 2012 at 7:14 AM

KHLOW2008

CERTIFIED EXPERT
41,814 POSTS

Here are the schematic for the RFW and possible causes.

SYSTEM WILL NOT OPERATE

FREEWHEELING-TO-LOCK (2WD-TO-4WD)

a) Faulty transfer case switch

b) Faulty control unit

c) Faulty lock solenoid

d) Faulty vacuum actuator

e) Vacuum leak at actuator or reservoir

f) Faulty 1-way check valve

LOCKUP-TO-FREEWHEELING (4WD-TO-2WD)

a) Faulty RFW main switch

b) Faulty transfer case switch

c) Faulty control unit

d) Faulty lock solenoid

e) Faulty vacuum actuator

f) Vacuum leak at actuator or reservoir

g) Faulty 1-way check valve

I would start with the simple basics first, check for dislodged or leaking vacuum lines at the vacuum actuator.

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