Diagnostic 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 ATP SWITCH SIGNAL With SDT Start engine. Select "Data list" mode for "4WD" with SDT. Read out the value of "ATP SWITCH". Courtesy of SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP. 2) Without SDT Start engine. Check voltage between transfer control unit harness connector terminal and ground. Courtesy of 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. Are the inspection results normal?	GO TO 5.	GO TO 2.
2	CHECK HARNESS BETWEEN TRANSFER CONTROL UNIT AND ATP SWITCH Turn ignition switch "OFF". (Stay for at least 5 seconds.) Disconnect transfer control unit harness connector and the ATP switch harness connector. Check continuity between transfer control unit harness connector M152 terminal 23 and ATP switch harness connector F55 terminal 8. Courtesy of SUZUKI OF AMERICA CORP. Continuity should exist. Also check harness for short to ground and short to power. Does continuity exist?	GO TO 3.	Repair or replace damaged parts.
3	CHECK GROUND CIRCUIT Turn ignition switch "OFF". (Stay for at least 5 seconds.) Disconnect ATP switch harness connector. Check continuity between ATP switch harness connector F55 terminal 9 and ground. Courtesy of SUZUKI OF AMERICA CORP. Continuity should exist. Also check harness for short to power. Does continuity exist?	GO TO 4.	Repair open circuit or short to power in harness or connectors.
4	CHECK ATP SWITCH Turn ignition switch "OFF". (Stay for at least 5 seconds.) Remove ATP switch. Refer to [4WD SYSTEM: COMPONENT PARTS LOCATION ]. Push and release ATP switch and check continuity between ATP switch terminals 8 and 9. 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 ATP 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 ATP WARNING LAMP Turn ignition switch "ON". (Do not start engine.) A/T selector lever "N" position and engage the parking brake. Switch 4WD shift switch from 4H to 4LO or 4LO to 4H. Does the ATP warning lamp turn ON while the actuator motor is operating?	Inspection End.	Refer to [ATP WARNING LAMP DOES NOT TURN ON ].