Power Supply Circuit For Transfer Control Unit
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1 Page 1 of Nissan Xterra 4.0L Eng S Power Supply Circuit For Transfer Control Unit CONSULT-II REFERENCE VALUE IN DATA MONITOR MODE Data are reference value. DATA MONITOR MODE REFERENCE Monitored item [Unit] Content Condition Display value BATTERY VOLT [V] Power supply for transfer control unit Ignition switch: ON TRANSFER CONTROL UNIT TERMINALS AND REFERENCE VALUE Data are reference value and are measured between each terminal and ground. CONNECTOR TERMINAL REFERENCE Terminal Wire color Item Condition Data (Approx.) 6 B Ground Always 18 B Ground Always 19 R Power supply (Memory back-up) Always 25 W/G Ignition switch monitor Ignition switch: OFF 32 B Actuator motor ground Always 40 V Transfer shut off relay Ignition switch: OFF (5 seconds after ignition switch is turned OFF) 44 Y Power supply 45 GR Power supply Ignition switch: OFF (5 seconds after ignition switch is turned OFF)
2 Page 2 of 7 Ignition switch: OFF (5 seconds after ignition switch is turned OFF) CAUTION: When using a circuit tester to measure for inspection, be sure not to extend forcibly any connector terminals. DIAGNOSTIC PROCEDURE 1. CHECK POWER SUPPLY 1. Turn ignition switch "OFF". (Stay for at least 5 seconds.) 2. Disconnect transfer control unit harness connector. 3. Check between transfer control unit harness connector terminals and ground. CONNECTOR TERMINAL VOLTAGE SPECIFICATION Connector Terminal Voltage (Approx.) M Ground 25 - Ground M Ground 44 - Ground 45 - Ground
3 Page 3 of 7 Fig 1: Checking Voltage Between Transfer Control Unit Harness Connector Terminals Ground 4. Turn ignition switch "ON". (Do not start engine.) 5. Check between transfer control unit harness connector terminals and ground. CONNECTOR TERMINAL VOLTAGE SPECIFICATION Connector Terminal Voltage (Approx.) M Ground 25 - Ground 40 - Ground M Ground 45 - Ground
4 Page 4 of 7 Fig 2: Checking Voltage Between Transfer Control Unit Harness Connector Terminals Ground 1. OK: GO TO NG: Check the following. If any items are damaged, repair or replace damaged parts A fusible link (No. j, located in the fuse and fusible link box). Refer to "POWER SUPPLY ROUTING CIRCUIT " A fuses [No. 21, located in the fuse block (J/B) and Nos. 57 and 58 located in the fuse and relay box]. Refer to "POWER SUPPLY ROUTING CIRCUIT ". 3. Harness for short or open between battery and transfer control unit harness connector M152 terminal Harness for short or open between battery and transfer shut off relay 2 harness connector E157 terminal 1 and Harness for short or open between battery and transfer shut off relay 1 harness connector E156 terminal 3.
5 Page 5 of 7 6. Harness for short or open between ignition switch and transfer control unit harness connector M152 terminal Harness for short or open between ignition switch and transfer shut off relay 1 harness connector E156 terminal 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, 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, Harness for short or open between transfer shut off relay 2 harness connector E157 terminal 2 and transfer control unit harness connector M153 terminal Harness for open between transfer shut off relay 1 harness connector E156 terminal 2 and ground. 12. and ignition switch. Refer to "POWER SUPPLY ROUTING CIRCUIT ". 13. Transfer shut off relay 1, 2. Refer to, "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 connector M152 terminals 6 and 18, and M153 terminal 32 and ground. Continuity should exist. Also check harness for short to power. 1. OK: GO TO NG: Repair open circuit or short to power in harness or connectors.
6 Page 6 of 7 Fig 3: Checking Continuity Between Transfer Control Unit Harness Connector M152 Terminals 6 And 18, And M153 Terminal 32 Ground 3. CHECK TRANSFER CONTROL UNIT Check transfer control unit input/output signal. Refer to, "TRANSFER CONTROL UNIT INPUT/OUTPUT SIGNAL REFERENCE VALUES ". 1. OK: GO TO NG: Check transfer control unit pin terminals for damage or loose connection with harness connector. If any items are damaged, repair or replace damaged parts. 4. CHECK DTC Perform the self-diagnosis, after driving vehicle for a while. 1. OK: Inspection End. 2. NG: Replace transfer control unit. Refer to, "REMOVAL AND INSTALLATION ".
7 Page 7 of 7 COMPONENT INSPECTION 1. Turn ignition switch "OFF". (Stay for at least 5 seconds.) 2. Remove transfer shut off relay 1 and transfer shut off relay 2. Refer to, "LOCATION OF ELECTRICAL PARTS ". 3. Apply 12V direct current between transfer shut off relay terminals 1 and Check continuity between relay terminals 3 and 5. CONNECTOR TERMINAL CONTINUITY SPECIFICATION Condition 12V direct current supply between terminals 1 and 2 OFF Continuity Yes No 5. If NG, replace the transfer shut off relay 1 or 2. Refer to, "LOCATION OF ELECTRICAL PARTS ". Fig 4: Checking Continuity Between Relay Terminals 3 And 5
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Page 1 of 9 2005 Nissan Xterra 4.0L Eng S Transfer Control Device CONSULT-II REFERENCE VALUE IN DATA MONITOR MODE Data are reference value. DATA MONITOR MODE REFERENCE Monitored item [Unit] Content Condition
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