DTC Troubleshooting: C1858-73 (71-01)
DTC C1858-73: Differential Fluid Pressure Deviation High
NOTE: Before you troubleshoot, review the General Troubleshooting Information.

DTC Description
DTC
Freeze Frame
C1858-73 Differential Fluid Pressure Deviation High
    

1.
Problem verification (function test with HDS):

Problem verification (function test with HDS)
?1.
Turn the vehicle to the ON mode.

?2.
Select the FUNCTIONAL TEST in the REAL TIME AWD with the HDS.

?3.
Do the OIL PRESSURE CONTROL TEST in the FUNCTIONAL TEST with the HDS.

  

Are fault codes indicated?

     
Fault code is not indicated
     
     
     
Intermittent failure, the system is OK at this time. If the freeze data/on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the freeze data/on-board snapshot.?
     
Fault code 4-1 or 6-1 is indicated
     
     
     
     
Fault code except 4-1 and 6-1 is indicated
     
     
     
The failure is duplicated. Go to step 2.
2.
DTC check:

DTC check
?1.
Select the FUNCTIONAL TEST in the REAL TIME AWD with the HDS.

?2.
Do the OIL PRESSURE CONTROL TEST in the FUNCTIONAL TEST with the HDS three times.

  

?3.
Check for DTCs with the HDS.
DTC Description
DTC
Freeze Frame
     

Are there any DTCs?

     
YES
     
     
     
Go to the indicated DTC's troubleshooting.?
     
NO
     
     
     
The system is OK at this time.?