DTC C1542 Clutch On Fault: Wiring diagram

Engine electrical system Ref. to WIRING SYSTEM>Engine Electrical System>WIRING DIAGRAM>NON-TURBO MODEL (WITHOUT PUSH BUTTON START) .

CAN communication system Ref. to WIRING SYSTEM>CAN Communication System>WIRING DIAGRAM>NON-TURBO MODEL .

Fig 1: CAN Communication System Wiring Diagram (Clutch ON Fault)

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK LAN SYSTEM. 

   Perform the diagnosis for LAN system. Ref. to LAN SYSTEM (DIAGNOSTICS)>Basic Diagnostic Procedure .

   Is there any fault in LAN system?

   • Yes  : Perform the diagnosis according to DTC for LAN system. Ref. to LAN SYSTEM (DIAGNOSTICS)>List of Diagnostic Trouble Code (DTC) .
   • No  : Go to 2. 
2. CHECK CLUTCH SIGNAL USING SUBARU SELECT MONITOR. 
   1. Using the Subaru Select Monitor, select Data monitor. Ref. to BRAKE CONTROL (DIAGNOSTICS)>Subaru Select Monitor>OPERATION>DATA MONITOR .
   2. Read [Clutch switch] indicated on the display screen.

   Is "OFF" displayed when the clutch pedal is not depressed, and is "ON" displayed when depressed?

   • Yes  : Go to  5.
   • No  : Go to 3. 
3. CHECK CLUTCH SIGNAL OF ECM USING SUBARU SELECT MONITOR. 
   1. Using the Subaru Select Monitor, select Data monitor in ECM. Ref. to ENGINE (DIAGNOSTICS) (H4DO)>Subaru Select Monitor>OPERATION>DATA MONITOR .
   2. Read [Clutch switch] indicated on the display screen.

   Is "OFF" displayed when the clutch pedal is not depressed, and is "ON" displayed when depressed?

   • Yes  : Go to  5.
   • No  : Go to 4. 
4. CHECK HARNESS BETWEEN ECM AND CLUTCH SWITCH (CHECK FOR OPEN CIRCUIT). 
   1. Turn the ignition switch to OFF.
   2. Disconnect the connectors from ECM and clutch switch.
   3. Measure the resistance of harness between ECM and clutch switch connector.

      Connector & terminal 

      (B134) No. 42 - (B107) No. 2:

   Is the resistance less than 1 Ω?

   • Yes  : Repair the power supply circuit of clutch switch. Or replace the clutch switch. Ref. to CLUTCH SYSTEM>Clutch Switch .
   • No  : Repair the harness between ECM and clutch switch connector.
5. CHECK VDCCM&H/U. 
   1. Connect all connectors.
   2. Clear the memory. Ref. to BRAKE CONTROL (DIAGNOSTICS)>Clear memory .
   3. Perform the Inspection Mode. Ref. to BRAKE CONTROL (DIAGNOSTICS)>Inspection Mode .
   4. Read the DTC. Ref. to BRAKE CONTROL (DIAGNOSTICS)>Read Diagnostic Trouble Code (DTC) .

   Is the same DTC displayed?

   • Yes  : Replace the VDCCM only. Ref. to VEHICLE DYNAMICS CONTROL (VDC)>VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)>REPLACEMENT .
   • No  : Go to 6. 
6. CHECK DETECTION OF OTHER DTCS FOR VDC. 

   Ref. to BRAKE CONTROL (DIAGNOSTICS)>Read Diagnostic Trouble Code (DTC) .

   Is any other DTC displayed?

   • Yes  : Perform the diagnosis according to DTC. Ref. to BRAKE CONTROL (DIAGNOSTICS)>List of Diagnostic Trouble Code (DTC) .
   • No  : Currently, it is normal. There may have been a temporary poor contact in the harness and connector or a temporary noise interference.