AWD Warning Light Display: Inspection

DIAGNOSIS: 

• CAN communication is lost with the combination meter.
• Combination meter malfunction
• TCM is in AWD special control mode.

TROUBLE SYMPTOM: 

• When the ignition switch is turned to ON, the AWD light does not illuminate.
• AWD light remains lit after engine start.
• AWD light is blinking immediately after engine start.

1. CHECK TCM. 

   Check the DTC relating the TCM using the Subaru Select Monitor.

   Is DTC U0155 or U0423 displayed?

   Yes:  Perform the self-diagnosis of combination meter.

   No:  Go to  2

2. CHECK TCM. 

   Check the DTC relating the TCM using the Subaru Select Monitor.

   Are DTCs other than U0155 and U0423 displayed?

   Yes:  Perform the diagnosis according to DTC.

   No:  Go to  3

3. CHECK COMBINATION METER. 

   Check the DTC of combination meter.

   Is DTC displayed?

   Yes:  Perform the diagnosis according to DTC.

   No:  Go to  4

4. CHECK AWD LIGHT. 

   Turn the ignition switch to ON.

   Does AWD light illuminate and then go off in 2 seconds?

   Yes:  Go to  5

   No:  Perform the self-diagnosis of combination meter. Ref. to INSTRUMENTATION/DRIVER INFO>Combination Meter System>OPERATION>SELF-DIAGNOSIS DISPLAY MODE

5. CHECK AWD LIGHT. 

   Start the engine.

   Does the AWD light go off?

   Yes:  Current condition is normal. Go back to Basic Diagnostic Procedure. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (DIAGNOSTICS)>BASIC DIAGNOSTIC PROCEDURE 

   No:  Go to  6

6. CHECK DTC. 

   Read the DTC relating the TCM using the Subaru Select Monitor.

   Is DTC displayed?

   Yes:  Perform the diagnosis according to DTC.

   No:  Go to  7

7. CHECK AWD LIGHT. 

   Check the display of AWD light after engine start.

   Is AWD light illuminating?

   Yes:  Go to  9

   No:  Go to  8

8. CHECK AWD LIGHT. 

   Check the display of AWD light after engine start.

   Is AWD light blinking at 2 Hz?

   Yes:  Go to  10

   No:  Go to  11

9. CHECK AWD ON/OFF SWITCHING FUNCTION. 

   Using the Subaru Select Monitor, select the «AWD ON/OFF switching mode» in «Work Support» display, and check the current mode. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION(TR580)>AWD ON/OFF SWITCHING MODE

   Is the message «At present, the vehicle is in AWD. Switch to FF?» displayed?

   Yes:  Go to  11

   No:  If the message «At present, the vehicle is in FF. Switch to AWD?» is displayed, select "OK", and switch to AWD mode.

10. CHECK REAR DIFFERENTIAL. 

    Using the Subaru Select Monitor, select and check «Rear differential inspection mode» in «Work Support» display. Ref. to DIFFERENTIALS>REAR DIFFERENTIAL INSPECTION MODE

    Does AWD light go off after inspection is finished normally?

    Yes:  Current condition is normal. Go back to Basic Diagnostic Procedure. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (DIAGNOSTICS)>BASIC DIAGNOSTIC PROCEDURE 

    No:  Go to  11

11. CHECK COMBINATION METER. 

    Perform the self-diagnosis of combination meter. Ref. to INSTRUMENTATION/DRIVER INFO>Combination Meter System>OPERATION>SELF-DIAGNOSIS DISPLAY MODE

    Is there any trouble with the combination meter?

    Yes:  Repair the combination meter.

    No:  Replace the TCM. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION(TR580)>TRANSMISSION CONTROL MODULE (TCM) Ref. to CONTINUOUSLY VARIABLE TRANSMISSION(TR690)>TRANSMISSION CONTROL MODULE (TCM)