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Diagnosis Procedure

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

Step Action YES NO
1  CHECK POWER SUPPLY 
  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 and ground.
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  1. 4. Turn ignition switch "ON". (Do not start engine.)
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  1. 5. Check voltage between transfer control unit harness connector terminals and ground.
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Are the inspection results normal? 		 GO TO 2. Check the following. If any items are damaged, repair or replace damaged parts. 
  • 10A fuse (No. 57, located in the fuse and relay box).
  • 40A fuse (No. J  , located in the fuse and fusible link box).
  • Harness for short or open between battery and transfer shut off relay 1 harness connector E156 terminal 3.
  • Harness for short or open between transfer control unit harness connector M153 terminal 27 and transfer shut off relay 1 harness connector E156 terminal 5.
  • Harness for short or open between ignition switch and transfer shut off relay 1 harness connector E156 terminal 1.
  • Harness for short or open between transfer shut off relay 1 harness connector E156 terminal 2 and ground.
  • Harness for short or open between ignition switch and transfer control unit harness connector M152 terminal 25.
  • Battery and ignition switch.
  • Transfer shut off relay 1. Refer to [P1801, P1811 POWER SUPPLY CIRCUIT FOR TRANSFER CONTROL UNIT ].
2  CHECK GROUND CIRCUIT 
  1. Turn ignition switch "OFF".
  2. Disconnect transfer control unit harness connector.
  3. Check continuity between transfer control unit harness connector M153 terminal 32 and ground.
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Continuity should exist. 
Also check harness for short to power.
Is there continuity? 		 GO TO 3. Repair open circuit or short to power in harness or connectors.
3  CHECK POWER SUPPLY SIGNAL 
  1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
  2. Connect transfer control unit harness connector.
  3. Check voltage between transfer control unit harness connector terminal and ground.
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G06444809G06444810G06444811G06444812

  1. 4. Turn ignition switch "ON". (Do not start engine.)
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  1. 5. Check voltage between transfer control unit harness connector terminal and ground.
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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 battery and transfer shut off relay 2 harness connector E157 terminal 1.
  • Harness for short or open between transfer shut off relay 2 harness connector E157 terminal 2 and transfer control unit harness connector M153 terminal 40.
  • Transfer shut off relay 2.
4  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 5 (With SDT) or GO TO 6 (Without SDT). Check transfer control unit pin terminals for damage or loose connection with harness connector. If any items are damaged, repair or replace damaged parts.
5  PERFORM DTC CHECK (WITH SDT) 
With SDT 
  1. Turn ignition switch "ON". (Do not start engine.)
  2. Select "DTC check" mode for "4WD" with SDT.
  3. Touch "Clear".
  4. Turn ignition switch "OFF" and wait at least 10 seconds.
  5. Perform "DTC check" again.

Is the "SHIFT ACT CIR [P1819]" displayed? 		 Replace transfer control unit. Refer to [TRANSFER CONTROL UNIT: REMOVAL AND INSTALLATION ]. Inspection End.
6  PERFORM SELF-DIAGNOSIS (WITHOUT SDT) 
Without SDT 
  1. Perform the self-diagnosis and then erase self-diagnosis results. Refer to [SDT FUNCTION (4WD) ].
  2. Perform the self-diagnosis again.

Do the self-diagnosis results indicate transfer control device? 		 Replace transfer control unit. Refer to [TRANSFER CONTROL UNIT: REMOVAL AND INSTALLATION ]. Inspection End.
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