Fault (Trouble) Code 3/22251

If another fault code other than 32251 or 22251 exists, diagnose that code(s) first.
1. Ensure battery voltage is present at pins 3, 33 and 35.
a. If no voltage is present at all pins, check ABS 30A fuse for the +30 feed (fuse box at bulkhead), RD lead from fuse to system relay and to terminal block on battery shelf.
b. If voltage is present at one of the pins, check lead from ECU pin to system relay.
c. If voltage is present at pin 35 only, check system relay operating circuit and that no other fault codes exist for faults that could cause exciter circuit to be open.
2. If no voltage is present at pins 34, 3 and 33, check 10A fuse (ABS).
a. If fuse is good, check live feed to pin 53. If no voltage is present at pin 53, go to step e.
b. If voltage is present at pin 53, check GN lead between pin 86 on system relay and ECU pin 34.
c. Ensure voltage is present at system relay pin 85. If not, go to step f.
d. If voltage exists, try a new system relay.
e. If no voltage exits at pin 53, check RD/WH lead as far as the fuse, and the feed in the lead from pin 54 of ignition switch to the live side of ABS fuse.
f. Check BK lead from pin 85 on system relay through pump relay to 10A fuse.
3. If there is battery voltage at pin 34 but not at pins 3 and 33, operating circuit is satisfactory but ECU has failed to ground the circuit because of another fault in ABS system.
4. If battery voltage is reaching pin 34 but fault code 3/22251 is still being generated, check resistance across relay pins 85 and 86. Resistance should be approximately 75 ohms.