EPS DTC Troubleshooting: 12-01
DTC 12-01:
 Low/High VBU Voltage (Regular diagnosis)
  1. Turn the ignition switch OFF.
  1. Connect the HDS to the data link connector (DLC).
  1. Turn the ignition switch ON (II).
  1. Check the VBU in the DATA LIST with the HDS.
Is the voltage at 9.2−17.4 V?
YES -
Check for loose wires or poor connections. If the connections are good, the system is OK at this time.■
NO -
Go to Step 5 .
  1. Check the No. 1 (70 A) fuse in the under-hood fuse/relay box.
Is the fuse OK?
YES -
Reinstall the fuse, and go to Step 6 .
NO -
Replace the fuse, and recheck. If the fuse is blown, check for a short to body ground in this fuse circuit.■
  1. Turn the ignition switch OFF.
  1. Disconnect the EPS control unit connector A (2P) and connector D (28P).
  1. Measure the voltage between the EPS control unit connector A (2P) terminal No. 2 and body ground.
Is there battery voltage?
YES -
Check for loose terminals in the EPS control unit A (2P) connector, and repair if necessary. If no poor connections are found, replace the EPS control unit. ■
NO -
Repair open in the wire between the EPS control unit and under-hood fuse/relay box.■