Diagnosis Procedure

WARNING: This page is about a different variant/trim than selected.

Regarding Wiring Diagram information, refer to [TRANSFER CONTROL UNIT: WIRING DIAGRAM ].

DIAGNOSIS PROCEDURE

Step	Action	YES	NO
1	CHECK 4WD SHIFT SWITCH SIGNAL With SDT Turn ignition switch "ON". Select "Data list" mode for "4WD" with SDT. Read out ON/OFF switching action of the "2WD SWITCH", "4H SWITCH", "4L SWITCH" with operating 4WD shift switch. Without SDT Turn ignition switch "ON". Check voltage between transfer control unit harness connector terminals and ground. Courtesy of SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP. Courtesy of SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP. Are the inspection results normal?	GO TO 5.	GO TO 2.
2	CHECK 4WD SHIFT SWITCH POWER SUPPLY CIRCUIT Turn ignition switch "OFF". (Stay for at least 5 seconds.) Disconnect 4WD shift switch harness connector. Check voltage between 4WD shift switch harness connector terminal 1 and ground. Courtesy of SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP. Courtesy of SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP. 4. Turn ignition switch "ON". (Do not start engine.) Courtesy of SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP. 5. Check voltage between 4WD shift switch harness connector terminal 1 and ground. Courtesy of SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP. Is there voltage?	GO TO 3.	Check harness for short or open between 4WD shift switch harness connector terminal 1 and transfer shut off relay 2 harness connector E157 terminal 5 and 10A fuse (No. 58 located in the fuse and relay box). If any items are damaged, repair or replace damaged parts. Perform trouble diagnosis for power supply circuit. Refer to [P1801, P1811 POWER SUPPLY CIRCUIT FOR TRANSFER CONTROL UNIT ].
3	CHECK HARNESS BETWEEN 4WD SHIFT SWITCH AND TRANSFER CONTROL UNIT Turn ignition switch "OFF". (Stay for at least 5 seconds.) Disconnect transfer control unit harness connector and the 4WD shift switch harness connector. Check continuity between the following terminals. Courtesy of SUZUKI OF AMERICA CORP. Transfer control unit harness connector M152 terminal 14 and 4WD shift switch harness connector M141 terminal 3. Transfer control unit harness connector M152 terminal 15 and 4WD shift switch harness connector M141 terminal 5. Transfer control unit harness connector M152 terminal 16 and 4WD shift switch harness connector M141 terminal 6. Continuity should exist. Also check harness for short to ground and short to power. Is there continuity?	GO TO 4.	Repair or replace damaged parts.
4	CHECK 4WD SHIFT SWITCH Turn ignition switch "OFF". (Stay for at least 5 seconds.) Remove 4WD shift switch harness connector. Operate 4WD shift switch and check continuity between 4WD shift switch terminals. Courtesy of SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP. Courtesy of SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP. Are the inspection results normal?	GO TO 5.	Replace 4WD shift switch.
5	CHECK TRANSFER CONTROL UNIT Check transfer control unit input/output signal. Refer to [TRANSFER CONTROL UNIT: REFERENCE VALUE ]. Are the inspection results normal?	GO TO 6.	Check transfer control unit pin terminals for damage or loose connection with harness connector. If any items are damaged, repair or replace damaged parts.
6	CHECK DTC Drive the vehicle and then perform "DTC check". Is DTC P1813 displayed?	Replace transfer control unit. Refer to [TRANSFER CONTROL UNIT: REMOVAL AND INSTALLATION ].	Inspection End.