Circuit/System Testing

C0408 02, C0408 04, C0408 42, C0408 43, or C0408 4B

1. Ignition OFF, disconnect the X2 harness connector at the K47 Rear Differential Clutch Control Module.
2. Test for infinite resistance between the control circuit terminal B and ground.
   • If less than infinite resistance 
   1. Disconnect the harness connector at the Q49 Rear Differential Clutch Solenoid Valve.
   2. Test for infinite resistance between the control circuit and ground.
      • If less than infinite resistance, test or replace the M32 Differential Clutch Pump.
      • If infinite resistance
   3. Test or replace the Q49 Rear Differential Clutch Solenoid Valve.
   • If infinite resistance 
3. Test for 2-4 Ω between the control terminal B and the low reference terminal A.
   • If not between 2-4 Ω 
   1. Disconnect the harness connector at the Q49 Rear Differential Clutch Solenoid Valve.
   2. Test for less than 2 Ω in the control circuit end to end.
      • If 2 Ω or greater, test or replace the M32 Differential Clutch Pump.
      • If less than 2 Ω
   3. Test for less than 2 Ω in the low reference circuit end to end.
      • If 2 Ω or greater, test or replace the M32 Differential Clutch Pump.
      • If less than 2 Ω
   4. Test or replace the Q49 Rear Differential Clutch Solenoid Valve.
   • If between 2-4 Ω 
4. Replace the K47 Rear Differential Clutch Control Module.

C0408 61

1. Replace the Q49 Rear Differential Clutch Solenoid Valve.
2. Ignition ON.
3. Verify DTC C0408 61 is not set.
   • If the DTC is set 

     Replace the K47 Rear Differential Clutch Control Module.

   • If the DTC is not set 
4. All OK.