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DLN-22 < DTC/CIRCUIT DIAGNOSIS > [TRANSFER: TX15B] P1801, P1811 POWER SUPPLY CIRCUIT FOR TRANSFER CONTROL UNIT 4. Turn ignition switch “ON”. (Do not start engine.) 5. Check voltage between transfer control unit harness connector terminals and ground. Is there voltage? YES >> GO TO 2. NO >> Check the following. If any items are damaged, repair or replace damaged parts. • 40A fuse (No. J, located in the fuse and fusible link box). • 10A fuses (No. 18, located in the fuse block (J/B) and No. 58 located in the fuse and relay box). • Harness for short or open between battery and transfer control unit harness connector M152 terminal 19. • Harness for short or open between battery and transfer shut off relay 2 harness connector E157 terminal 1 and 3. • Harness for short or open between battery and transfer shut off relay 1 harness connector E156 terminal 3. • Harness for short or open between ignition switch and transfer control unit harness connector M152 terminal 25. • Harness for short or open between ignition switch and transfer shut off relay 1 harness connec- tor E156 terminal 1. • Harness for short or open between transfer shut off relay 2 harness connector E157 terminal 5 and transfer control unit harness connector M153 terminals 44, 45. • Harness for short or open between transfer shut off relay 1 harness connector E156 terminal 5 and transfer control unit harness connector M153 terminals 44, 45. • 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. • Harness for open between transfer shut off relay 1 harness connector E156 terminal 2 and ground. • Battery and ignition switch. • Transfer shut off relay 1, 2. Refer to DLN-23, "Component Inspection" . 2. CHECK GROUND CIRCUIT 1. Turn ignition switch “OFF”. 2. Disconnect transfer control unit harness connector. 3. Check continuity between transfer control unit harness connec- tor M152 terminals 6 and 18, and M153 terminal 32 and ground. Also check harness for short to power. Do you have continuity? YES >> GO TO 3. NO >> Repair open circuit or short to power in harness or con- nectors. 3. CHECK TRANSFER CONTROL UNIT Check transfer control unit input/output signal. Refer to Are the inspection results normal? YES >> GO TO 4. NO >> Check transfer control unit pin terminals for damage or loose connection with harness connector. If any items are damaged, repair or replace damaged parts. Connector Terminal Voltage (Approx.) M152 19 - Ground Battery voltage 25 - Ground M153 40 - Ground 44 - Ground 45 - Ground SDIA3361E Continuity should exist. SDIA3362E |