Ok, still some confusion on how the diff locking works, and what the CDL switch/7pin mod do. Here's the breakdown:
80/100 SERIES 1993 THRU 2001
WITH ABS AND HF2AV (VISCOUS CLUTCH) TRANSFER CASE
1) STOCK:
AWD OPEN CENTER DIFFERENTIAL IN H RANGE. When front and rear driveshaft speeds differ, the Viscous Coupling engages to apply LSD locking to the center differential. This is to assure 2 drive wheels during low cf conditions. ABS is fully active in H RANGE always, VC disengagement when no torque (brakes applied) to it so abs can function properly.
1A) STOCK:
AWD LOCKED CENTER DIFFERENTIAL IN L RANGE. The HF2AV is the same as the HF2A in this function mode. A motor driven mechanical center diff lock actuator physically locks the center diff in L range, VC effectively bypassed with mechanical center diff locking and ABS OFF light illuminates.
2) CDL SWITCH (CDLS) MOD ONLY:
MECHANICAL CENTER DIFF LOCK OF H RANGE. This allows the driver to manually engage the mechanical center diff lock in H Range. ABS OFF light illuminates. The L Range operates as stock, locks center diff with L range engagement. ABS OFF light illuminates
3) CDL SWITCH AND DISCONNECT L RANGE SWITCH (on transfer case) MOD.
MECHANICAL CENTER DIFF LOCK OF H&L RANGE.
This mod means that the mechanical center diff lock is only engaged when button is on, H or L range. CDLS OFF - ABS and VC is active in H or L range. CDLS ON - ABS OFF in H or L range, VC is effectively bypassed with mechanical locking.
4) CDL SWITCH AND PIN 7 (center diff relay pin) MOD. Basically the same as 3 (arguably the better mod tho), this mod means that mechanical center diff lock is engaged only if CDL Switch activated in low or high range. CDLS - OFF ABS active in H or L range, VC operates in both ranges. CDLS - ON ABS OFF in H or L range, VC is effectively bypassed with mechanical locking.
Hoping this clears up some of the confusion.
Scott Justusson
'94 FZJ80 with HF2AV, ABS, CDLS and pin 7 mod
80/100 SERIES 1993 THRU 2001
WITH ABS AND HF2AV (VISCOUS CLUTCH) TRANSFER CASE
1) STOCK:
AWD OPEN CENTER DIFFERENTIAL IN H RANGE. When front and rear driveshaft speeds differ, the Viscous Coupling engages to apply LSD locking to the center differential. This is to assure 2 drive wheels during low cf conditions. ABS is fully active in H RANGE always, VC disengagement when no torque (brakes applied) to it so abs can function properly.
1A) STOCK:
AWD LOCKED CENTER DIFFERENTIAL IN L RANGE. The HF2AV is the same as the HF2A in this function mode. A motor driven mechanical center diff lock actuator physically locks the center diff in L range, VC effectively bypassed with mechanical center diff locking and ABS OFF light illuminates.
2) CDL SWITCH (CDLS) MOD ONLY:
MECHANICAL CENTER DIFF LOCK OF H RANGE. This allows the driver to manually engage the mechanical center diff lock in H Range. ABS OFF light illuminates. The L Range operates as stock, locks center diff with L range engagement. ABS OFF light illuminates
3) CDL SWITCH AND DISCONNECT L RANGE SWITCH (on transfer case) MOD.
MECHANICAL CENTER DIFF LOCK OF H&L RANGE.
This mod means that the mechanical center diff lock is only engaged when button is on, H or L range. CDLS OFF - ABS and VC is active in H or L range. CDLS ON - ABS OFF in H or L range, VC is effectively bypassed with mechanical locking.
4) CDL SWITCH AND PIN 7 (center diff relay pin) MOD. Basically the same as 3 (arguably the better mod tho), this mod means that mechanical center diff lock is engaged only if CDL Switch activated in low or high range. CDLS - OFF ABS active in H or L range, VC operates in both ranges. CDLS - ON ABS OFF in H or L range, VC is effectively bypassed with mechanical locking.
Hoping this clears up some of the confusion.
Scott Justusson
'94 FZJ80 with HF2AV, ABS, CDLS and pin 7 mod
