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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 ACTUATOR MOTOR SIGNAL 
  1. With SDT 
    1. Start engine.
    2. Select "Data list" mode for "4WD" with SDT.
    3. Read out the value of "SHIFT ACT1", "SHIFT AC MON1", "SHIFT ACT2", "SHIFT AC MON2".
G06444778G06444779G06444780Courtesy of SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP.

  1. 2) Without SDT 
    1. Start engine.
    2. Depress brake pedal and stop vehicle.
    3. Set A/T selector lever to "N" position.
    4. Check voltage between transfer control unit harness connector terminal and ground.
G06444778G06444779G06444780Courtesy of SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP.
G06444778G06444779G06444780Courtesy of SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP.

Are the inspection results normal? 		 GO TO 9. GO TO 2.
2  CHECK ACTUATOR MOTOR POWER SUPPLY CIRCUIT 
  1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
  2. Disconnect transfer control unit harness connector.
  3. Check voltage between transfer control unit harness connector terminal 27 and ground.
G06444781G06444782G06444783G06444784Courtesy of SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP.
G06444781G06444782G06444783G06444784Courtesy of SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP.

  1. 4. Turn ignition switch "ON".
G06444781G06444782G06444783G06444784Courtesy of SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP.

  1. 5. Check voltage between transfer control unit harness connector terminal 27 and ground.
G06444781G06444782G06444783G06444784Courtesy of SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP.

Are the inspection results normal? 		 GO TO 3.
  1. Check harness for short or open between transfer control unit harness connector M153 terminal 27 and transfer shut off relay 2 harness connector E157 terminal 5 and 10A fuse (No. 57, located in the fuse and relay block). If any items are damaged, repair or replace damaged parts.
  2. Perform trouble diagnosis for power supply circuit. Refer to [P1801, P1811 POWER SUPPLY CIRCUIT FOR TRANSFER CONTROL UNIT ].
3  CHECK TRANSFER RELAY POWER SUPPLY CIRCUIT 
  1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
  2. Remove transfer shift high relay and transfer shift low relay. Refer to [4WD SYSTEM: COMPONENT PARTS LOCATION ].
  3. Check voltage between transfer control unit harness connector terminal and ground.
G06444785G06444786G06444787G06444788Courtesy of SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP.
G06444785G06444786G06444787G06444788Courtesy of SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP.

  1. 4. Turn ignition switch "ON". (Do not start engine.)
G06444785G06444786G06444787G06444788Courtesy of SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP.

  1. 5. Check voltage between transfer control unit harness connector terminal and ground.
G06444785G06444786G06444787G06444788Courtesy of SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP.

Are the inspection results normal? 		 GO TO 4. Check the following. If any items are damaged, repair or replace damaged parts. 
  • Harness for short or open between transfer control unit harness connector terminal 27 and transfer shift high relay harness connector E46 terminal 2.
  • Harness for short or open between transfer control unit harness connector terminal 27 and transfer shift low relay harness connector terminal E47 terminal 2.
4  CHECK TRANSFER RELAY 
  1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
  2. Remove transfer shift high relay and transfer shift low relay.
  3. Apply 12V direct current between transfer shift high and low relay terminals 1 and 2.
G06444789G06444790Courtesy of SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP.

  1. 4. Check continuity between relay terminals 3 and 4, 3 and 5.
G06444789G06444790Courtesy of SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP.

Are the inspection results normal? 		 GO TO 5. Replace the transfer shift high or low relay.
5  CHECK (1): HARNESS BETWEEN TRANSFER CONTROL UNIT AND TRANSFER SHIFT RELAY 
  1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
  2. Disconnect transfer control unit harness connector.
  3. Remove transfer shift high relay and transfer shift low relay.
  4. Check continuity between the following terminals.
G06444791Courtesy of SUZUKI OF AMERICA CORP.

  • Transfer control unit harness connector M153 terminal 42 and transfer shift high relay harness connector E46 terminal 1.
  • Transfer control unit harness connector M153 terminal 50 and transfer shift low relay harness connector E47 terminal 1.

    Continuity should exist. 

    Also check harness for short to ground and short to power.


Is there continuity? 		 GO TO 6. Repair or replace damaged parts.
6  CHECK (2): HARNESS BETWEEN TRANSFER CONTROL UNIT AND TRANSFER SHIFT RELAY 
  1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
  2. Disconnect transfer control unit harness connector.
  3. Remove transfer shift high relay and transfer shift low relay.
  4. Check continuity between the following terminals.
G06444792Courtesy of SUZUKI OF AMERICA CORP.

  • Transfer control unit harness connector M153 terminal 28 and transfer shift high relay harness connector E46 terminal 5.
  • Transfer control unit harness connector M153 terminal 28 and transfer shift low relay harness connector E47 terminal 5.
  • Transfer control unit harness connector M153 terminal 31 and transfer shift high relay harness connector E46 terminal 4.
  • Transfer control unit harness connector M153 terminal 31 and transfer shift low relay harness connector E47 terminal 4.

    Continuity should exist. 

    Also check harness for short to ground and short to power.


Is there continuity? 		 GO TO 7. Repair or replace damaged parts.
7  CHECK ACTUATOR MOTOR OPERATION CIRCUIT 
  1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
  2. Disconnect transfer control unit harness connector and the transfer control device (actuator motor) harness connector.
  3. Check continuity between the following terminals.
    • Transfer control unit harness connector M153 terminal 47 and transfer control device (actuator motor) harness connector F58 terminal 23.
G06444793G06444794Courtesy of SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP.

  • Transfer control unit harness connector M153 terminal 48 and transfer control device (actuator motor) harness connector F58 terminal 24.
  • Transfer control device (actuator motor) harness connector F58 terminal 24 and transfer shift high relay harness connector E46 terminal 3.
G06444793G06444794Courtesy of SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP.

  • Transfer control device (actuator motor) harness connector F58 terminal 23 and transfer shift low relay harness connector E47 terminal 3.

    Continuity should exist. 

    Also check harness for short to ground and short to power.


Is there continuity? 		 GO TO 8. Repair or replace damaged parts.
8  CHECK ACTUATOR MOTOR 
  1. Remove transfer control device. Refer to [TRANSFER CONTROL DEVICE: REMOVAL AND INSTALLATION ].
  2. Check operation by applying battery voltage to transfer control device (actuator motor) terminals 23 and 24.
G06444795G06444796Courtesy of SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP.
CAUTION: Be careful not to overheat the harness.
G06444795G06444796Courtesy of SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP.

Does actuator motor rotate? 		 GO TO 9. Replace transfer control device (actuator motor).
9  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 10. Check transfer control unit pin terminals for damage or loose connection with harness connector. If any items are damaged, repair or replace damaged parts.
10  CHECK DTC 
Perform "DTC check", after driving a vehicle for a while.
Is DTC P1817 displayed? 		 Replace transfer control unit. Refer to [TRANSFER CONTROL UNIT: REMOVAL AND INSTALLATION ]. Inspection End.
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