EPS DTC Troubleshooting: 34-03, 34-04
DTC 34-03: Short in EPS Motor Harness
DTC 34-04: Short in EPS Motor Harness
NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the how to troubleshoot the EPS.

DTC Description
DTC
Freeze Frame
34-03 Short in EPS Motor Harness
    
34-04 Short in EPS Motor Harness
    

1.
Problem verification:

Problem verification
?1.
Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.

?2.
Clear the DTC with the HDS.


?3.
Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode, then start the engine.

?4.
Turn the steering wheel to the right or left at least 5 times.

?5.
Check for DTCs with the HDS.
DTC Description
DTC
Freeze Frame
34-03 Short in EPS Motor Harness
    
34-04 Short in EPS Motor Harness
    

Is DTC 34-03 or 34-04 indicated?

     
YES
     
     
     
The failure is duplicated. Go to step 2.
     
NO
     
     
     
Intermittent failure, the system is OK at this time.?
2.
Shorted wire check (MTR V line to MTR U line):

Shorted wire check (MTR V line to MTR U line)
?1.
Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.

?2.
Disconnect the following connectors.

?3.
Measure the resistance between test points 1 and 2.
Test condition
IG LOCK (0) or OFF mode
 
EPS control unit connector B (16P): disconnected
 
EPS motor 3P connector: disconnected
Test circuit
MTR V, MTR U
Test point 1
EPS control unit connector B (16P) No. 1 (BLK)
Test point 2
EPS control unit connector B (16P) No. 2 (RED)


Is there an open circuit or at least 1 M??

     
YES
     
     
     
The MTR V and MTR U wires are OK. Go to step 3.
     
NO
     
     
     
Repair a short in the wire between the EPS control unit and the EPS motor.?
3.
EPS control unit check (update):

EPS control unit check (update)
?1.
Reconnect the following connectors.

?2.
Update the EPS control unit if it does not have the latest software.

?3.
Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode, then start the engine.

?4.
Turn the steering wheel to the right or left at least 5 times.

?5.
Check for DTCs with the HDS.
DTC Description
DTC
Freeze Frame
34-03 Short in EPS Motor Harness
    
34-04 Short in EPS Motor Harness
    

Is DTC 34-03 or 34-04 indicated?

     
YES
     
     
     
     
NO
     
     
     
Troubleshooting is complete.?