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Transfer (ATX14B): Overview Nissan Armada I facelift

Transfer Case 17 illustrations ~2862 words

Scheme 1

Scheme 1: WORK FLOW
Scheme 1: WORK FLOW

COMPONENT DESCRIPTION

ComponentsFunction
Transfer control unitControls transfer control device, control valves and shifts between 2WD/4WD and 4H/4LO.
Transfer control deviceIntegrates actuator motor and actuator position switch.
2-4WD shift solenoid valveControls oil pressure and allows shifting between 2WD and 4WD.
Clutch pressure solenoid valveControls oil pressure and distributes torque between front and rear tires.
Line pressure switchDetects line pressure.
Clutch pressure switchDetects clutch pressure.
Transfer fluid temperature sensorDetects transfer fluid temperature.
Actuator motorMoves shift rods when signaled by transfer control unit.
Actuator position switchDetects actuator motor position.
Wait detection switchDetects whether or not 4WD lock gear is locked.
4LO switchDetects if transfer case is in 4LO.
ATP switchDetects if transfer case is in neutral.
4WD shift switchAllows driver to select from 2WD/4WD, 4H/4LO and AUTO.
4WD warning lampIlluminates if malfunction is detected in 4WD system. Flashes (1 flash / 2 seconds) if large difference in diameter of front and rear tires. Flashes (2 flashes / 1 second) if high transfer fluid temperature is detected.
ATP warning lampIndicates that A/T parking mechanism does not operate when A/T selector lever is in P position because transfer case is in neutral.
4WD shift indicator lampDisplays driving range selected by 4WD shift switch.
4LO indicator lampDisplays 4LO range.
ABS actuator and electric unit (control unit)Transmits vehicle speed signal via CAN communication to transfer control unit.
TCMTransmits the following signal via CAN communication to transfer control unit. Output shaft revolution signal A/T position indicator signal (PNP switch signal)
ECMTransmits the following signals via CAN communication to transfer control unit. Engine speed signal Accelerator pedal position signal

COMPONENT DESCRIPTION

Scheme 2

Scheme 2: CONTROL SYSTEM
Scheme 2: CONTROL SYSTEM

Scheme 3

Scheme 3: ALL-MODE 4WD Transfer Basic Control P
Scheme 3: ALL-MODE 4WD Transfer Basic Control P

Scheme 4

Scheme 4: Hydraulic Control Circuits
Scheme 4: Hydraulic Control Circuits

Operation Procedure

  1. Connect CONSULT-III.
  2. With engine at idle, touch SELF-DIAG RESULTS.

Display shows malfunction experienced since the last erasing operation.

Note. The details for TIME are as follows: 0: Error currently detected with transfer control unit. Except for 0: Error detected in the past and memorized with transfer control unit. Detects frequency of driving after DTC occurs (frequency of turning ignition switch ON/OFF).

Description

If the engine starts when there is a malfunction in the 4WD system, the 4WD warning lamp turns ON or flickers in the combination meter. When the system functions properly, the warning lamp turns ON when the ignition switch is turned to ON, and it turns OFF after engine starts. To locate the cause of a malfunction, start the self-diagnosis function. The 4WD warning lamp in the combination meter will indicate the malfunction area by flashing according to the self-diagnostic results. Refer to " DTC INDEX ".

  1. Connect CONSULT-III.
  2. Touch DATA MONITOR.
  3. Select from SELECT MONITOR ITEM, screen of data monitor mode is displayed.

Note. When malfunction is detected, CONSULT-III performs REAL-TIME DIAGNOSIS. Also, any malfunction detected while in this mode will be displayed at real time.

  1. Connect CONSULT-III.
  2. Touch WORK SUPPORT.
  3. Select from CLUTCH/F RLS LIM ADJ, screen of data monitor mode is displayed.

Power supply to transfer control unit is abnormally low while driving.

The transfer control unit controls the transfer control device which controls shifts between AUTO, 4H and 4LO and between 2WD and 4WD. A DTC may set when any of the following occur

  1. Malfunction is detected in the memory (RAM) system of transfer control unit.
  2. Malfunction is detected in the memory (ROM) system of transfer control unit.
  3. Malfunction is detected in the memory (EEPROM) system of transfer control unit.
  4. AD converter system of transfer control unit is malfunctioning.

The transmission control module (TCM) transmits the output shaft revolution signal via CAN communication to Transfer control unit. DTC P1807 will set when a malfunction is detected in the output shaft revolution signal or an improper signal is input while driving.

The ABS actuator and electric unit (control unit) transmits a vehicle speed signal via CAN communication to the transfer control unit. DTC P1808 sets when a malfunction is detected in the vehicle speed signal that is output from the ABS actuator and electric unit (control unit) or an improper signal is input while driving.

The neutral-4LO switch detects that the transfer case is in neutral or 4LO range. DTC P1810 will set when an improper signal from the neutral-4LO switch is input due to an open or short circuit.

The 4WD shift switch allows the driver to select AUTO, 2WD or 4WD and 4H or 4LO. DTC P1813 will set if more than two switch inputs are simultaneously detected by the transfer control unit due to a short circuit in the 4WD shift switch.

The wait detection switch detects if the transfer case is in 4WD. DTC P1814 will set if an improper signal from the wait detection switch is input due to open or short circuit.

The A/T PNP switch transmits the A/T position indicator signal (PNP switch signal) via CAN communication to the transfer control unit. DTC P1816 will set when the A/T PNP switch signal is malfunctioning or there is a communication error.

The actuator motor receives signals from the transfer control unit and controls shift rods which shift the transfer case. DTC P1817 will set when any of the following occur

  1. Motor does not operate properly due to open or short circuit in actuator motor.
  2. Malfunction is detected in the actuator motor. (When 4WD shift switch is operated and actuator motor does not operate)
  3. Malfunction is detected in transfer shift high relay or transfer shift low relay.

The actuator position switch detects the current actuator motor range. DTC P1818 will set if either of the following occur

  1. Improper signal from actuator position switch is input due to open or short circuit.
  2. Malfunction is detected in actuator position switch.

The transfer control device integrates the actuator motor and actuator position switch. DTC P1819 will set if either of the following conditions exist

  1. Malfunction occurs in transfer control device actuator circuit.
  2. Malfunction is detected in the transfer shut off relay.

The ECM transmits the engine speed signal via CAN communication to the transfer control unit. DTC P1820 will set when either of the following occur

  1. Malfunction is detected in engine speed signal that is output from the ECM.
  2. Improper signal is input while driving.

Proper voltage is not applied to the clutch pressure solenoid valve due to open or short circuit.

Proper voltage is not applied to the 2-4WD solenoid valve due to an open or short circuit.

Motor does not operate properly due to open or short circuit in transfer motor or transfer motor relay.

Signal voltage from the transfer fluid temperature sensor is abnormally high (Transfer fluid temperature is abnormally low) while driving.

Improper signal from the clutch pressure switch is input due to open or short circuit. Also, a malfunction may have occurred in clutch pressure switch or hydraulic circuit.

Improper signal from line pressure switch is input due to open or short circuit. Also, a malfunction may have occurred in the line pressure switch or hydraulic circuit.

Malfunction is detected in accelerator pedal position signal that is output from ECM through CAN communication. Also, the signal voltage from accelerator pedal position sensor may be abnormally high or low.

Malfunction is detected in ABS operation signal that is output from ABS actuator and electric unit (control unit) through CAN communication.

Malfunction is detected in the VDC operation signal that is output from ABS actuator and electric unit (control unit) through CAN communication.

Malfunction is detected in TCS operation signal that is output from ABS actuator and electric unit (control unit) through CAN communication.

4WD shift indicator lamp and 4LO indicator lamp do not turn ON for approx. 1 second when turning ignition switch to ON.

Scheme 5

Scheme 5: Diagnosis Procedure
Scheme 5: Diagnosis Procedure

Scheme 6

Scheme 6
Scheme 6

Scheme 7

Scheme 7
Scheme 7

Scheme 8

Scheme 8
Scheme 8
  1. CHECK TRANSFER CONTROL UNIT POWER SUPPLY AND GROUND CIRCUITS Refer to " «DIAGNOSIS PROCEDURE»(ref-320214-S06536677892009071300000) ". Are the inspection results normal? YES: GO TO 2. NO: Repair as necessary.
  2. CHECK COMBINATION METER POWER SUPPLY CIRCUIT Turn ignition switch OFF. (Stay for at least 5 seconds.) Disconnect combination meter harness connector. Check voltage between combination meter harness connector terminal and ground. VOLTAGE SPECIFICATION Connector Terminal Voltage (Approx.) M24 24 - Ground 0V Turn ignition switch ON. (Do not start engine.) Check voltage between combination meter harness connector terminal and ground. VOLTAGE SPECIFICATION Connector Terminal Voltage (Approx.) M24 24 - Ground Battery voltage Are the inspection results normal? YES: GO TO 3. NO: Check the following. If any items are damaged, repair or replace damaged parts. 10A fuse [No. 14 located in the fuse block (J/B)]. Harness for short or open between battery and combination meter harness connector M24 terminal 24. Ignition switch.
  3. CHECK HARNESS BETWEEN TRANSFER CONTROL UNIT AND COMBINATION METER Turn ignition switch OFF. (Stay for at least 5 seconds.) Disconnect transfer control unit harness connector. Check continuity between the following terminals. Transfer control unit harness connector E142 terminal 2 and combination meter harness connector M24 terminal 32. Transfer control unit harness connector E142 terminal 11 and combination meter harness connector M24 terminal 31. Transfer control unit harness connector E142 terminal 12 and combination meter harness connector M24 terminal 33. Transfer control unit harness connector E142 terminal 21 and combination meter harness connector M24 terminal 30. Continuity should exist . Also check harness for short to ground and short to power. Are the inspection results normal? YES: GO TO 4. NO: Repair or replace damaged parts.
  4. CHECK INDICATOR LAMP CIRCUIT Connect combination meter harness connector. Turn ignition switch ON. Ground the following terminals using suitable wiring. Transfer control unit harness connector E142 terminal 2 and ground. Transfer control unit harness connector E142 terminal 11 and ground. Transfer control unit harness connector E142 terminal 12 and ground. Transfer control unit harness connector E142 terminal 21 and ground. Do indicator lamps turn on? YES: GO TO 5. NO: Replace combination meter. Refer to " «REMOVAL AND INSTALLATION»(ref-320198-S12468447772009071300000) ".
  5. SYMPTOM CHECK Check again. Are the inspection results normal? YES: Inspection End. NO: GO TO 6.
  6. CHECK TRANSFER CONTROL UNIT Check transfer control unit input/output signal. Refer to " «REFERENCE VALUE»(ref-320214-S34543446652009071300000) ". Are the inspection results normal? YES: Inspection End. 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.

4WD warning lamp does not turn ON when turning ignition switch to ON.

Scheme 9

Scheme 9
Scheme 9

Scheme 10

Scheme 10
Scheme 10
  1. CHECK TRANSFER CONTROL UNIT POWER SUPPLY AND GROUND CIRCUITS Refer to " «DIAGNOSIS PROCEDURE»(ref-320214-S06536677892009071300000) ". Are the inspection results normal? YES: GO TO 2. NO: Repair as necessary.
  2. CHECK COMBINATION METER POWER SUPPLY CIRCUIT Turn ignition switch OFF. (Stay for at least 5 seconds.) Disconnect combination meter harness connector. Check voltage between combination meter harness connector terminal and ground. VOLTAGE SPECIFICATION Connector Terminal Voltage (Approx.) M24 24 - Ground 0V Turn ignition switch ON. (Do not start engine.) Check voltage between combination meter harness connector terminal and ground. VOLTAGE SPECIFICATION Connector Terminal Voltage (Approx.) M24 24 - Ground Battery voltage Are the inspection results normal? YES: GO TO 3. NO: Check the following. If any items are damaged, repair or replace damaged parts. 10A fuse [No. 14 located in the fuse block (J/B)]. Harness for short or open between battery and combination meter harness connector M24 terminal 24. Ignition switch.
  3. CHECK HARNESS BETWEEN TRANSFER CONTROL UNIT AND COMBINATION METER Turn ignition switch OFF. (Stay for at least 5 seconds.) Disconnect transfer control unit harness connector. Check continuity between the following terminals. Transfer control unit harness connector E142 terminal 5 and combination meter harness connector M24 terminal 34. Continuity should exist . Also check harness for short to ground and short to power. Are the inspection results normal? YES: GO TO 4. NO: Repair or replace damaged parts.
  4. CHECK INDICATOR LAMP CIRCUIT Connect combination meter harness connector. Turn ignition switch ON. (Do not start engine.) Ground the following terminal using suitable wiring. Transfer control unit harness connector E142 terminal 5 and ground. Does 4WD warning lamp turn on? YES: GO TO 5. NO: Replace combination meter. Refer to " «REMOVAL AND INSTALLATION»(ref-320198-S12468447772009071300000) ".
  5. SYMPTOM CHECK Check again. Are the inspection results normal? YES: Inspection End. NO: GO TO 6.
  6. CHECK TRANSFER CONTROL UNIT Check transfer control unit input/output signal. Refer to " «REFERENCE VALUE»(ref-320214-S34543446652009071300000) ". Are the inspection results normal? YES: Inspection End. 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.

4WD shift indicator lamp or 4LO indicator lamp do not change when switching the 4WD shift switch.

ATP warning lamp does not turn ON when the transfer case is switched in or out of 4LO with the A/T selector lever in N position.

Scheme 11

Scheme 11: Diagnosis Procedure
Scheme 11: Diagnosis Procedure

Scheme 12

Scheme 12
Scheme 12

Scheme 13

Scheme 13
Scheme 13
  1. CHECK SYSTEM FOR CAN COMMUNICATION LINE Perform self-diagnosis. Refer to " «CONSULT-III FUNCTION (ALL MODE AWD/4WD)»(ref-320214-S21173834242009071300000) ". Do the self-diagnostic results indicate CAN communication? YES: Perform trouble diagnosis for CAN communication line. NO: GO TO 2.
  2. CHECK SYSTEM FOR 4WD SHIFT SWITCH Perform trouble diagnosis for 4WD shift switch system. Refer to " «DIAGNOSIS PROCEDURE»(ref-320214-S13927906592009071300000) ". Are the inspection results normal? YES: GO TO 3. NO: Repair or replace damaged parts.
  3. CHECK SYSTEM FOR PNP SWITCH SIGNAL Perform trouble diagnosis for PNP switch signal system. Refer to " «DIAGNOSIS PROCEDURE»(ref-320214-S04401314762009071300000) ". Are the inspection results normal? YES: GO TO 4. NO: Repair or replace damaged parts.
  4. CHECK SYSTEM FOR ATP SWITCH Perform trouble diagnosis for ATP switch system. Refer to " «DIAGNOSIS PROCEDURE»(ref-320214-S28651651912009071300000) ". Are the inspection results normal? YES: GO TO 5. NO: Repair or replace damaged parts.
  5. CHECK HARNESS BETWEEN TRANSFER CONTROL UNIT AND COMBINATION METER Turn ignition switch OFF. (Stay for at least 5 seconds.) Disconnect transfer control unit harness connector and combination meter harness connector. Check continuity between the following terminals. Transfer control unit harness connector E142 terminal 15 and combination meter harness connector M24 terminal 6. Continuity should exist . Transfer control unit harness connector E143 terminal 40 and combination meter harness connector M24 terminal 7. 40 to 7: Continuity should not exist . 7 to 40: Continuity should exist . Also check harness for short to ground and short to power. Are the inspection results normal? YES: GO TO 6. NO: Repair or replace damaged parts.
  6. CHECK ATP WARNING LAMP CIRCUIT Place A/T selector lever in P position. Connect combination meter harness connector and transfer control unit harness connector. Disconnect ATP switch harness connector. Ground the following terminal using suitable wiring. ATP switch harness connector F55 terminal 8 and ground. Turn ignition switch ON. (Do not start engine.) Does indicator lamp turn on? YES: GO TO 7. NO: Replace combination meter. Refer to " «REMOVAL AND INSTALLATION»(ref-320198-S12468447772009071300000) ".
  7. SYMPTOM CHECK Check again. Are the inspection results normal? YES: Inspection End. NO: GO TO 8.
  8. CHECK TRANSFER CONTROL UNIT Check transfer control unit input/output signal. Refer to " «REFERENCE VALUE»(ref-320214-S34543446652009071300000) ". Are the inspection results normal? YES: GO TO 9. 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.
  9. CHECK TRANSFER INNER PARTS Disassemble transfer assembly. Refer to " «DISASSEMBLY AND ASSEMBLY»(ref-320214-S07787078832009071300000) ". Check transfer inner parts. Are the inspection results normal? YES: Inspection End. NO: Repair or replace damaged parts.

The 4WD shift indicator lamp keeps flashing.

The 4WD warning lamp flashes quickly while driving (2 times / second). The lamp continues to flash until the ignition switch is turned OFF.

The 4WD warning lamp flashes slowly while driving (1 time / 2 seconds). The lamp continues to flash until the ignition switch is turned OFF.

This symptom occurs when the vehicle is accelerating in 4WD and the steering wheel is turned fully either direction. It may feel like a bump or being pushed from behind. A small amount of this bumping feeling is acceptable under certain road conditions. The transfer case may be adjusted using the CONSULT-III to compensate for this condition.

The ATP indicator is ON when the transfer case is not in neutral.

Scheme 14

Scheme 14: DIAGNOSTIC PROCEDURE
Scheme 14: DIAGNOSTIC PROCEDURE

Scheme 15

Scheme 15
Scheme 15

Scheme 16

Scheme 16
Scheme 16

Scheme 17

Scheme 17
Scheme 17
  1. CHECK ATP SWITCH SIGNAL With CONSULT-III Start engine. Select DATA MONITOR mode for ALL MODE AWD/4WD with CONSULT-III. Read out the value of ATP SWITCH. CONDITION CHART Condition Display value Vehicle stopped Engine running A/T selector lever N Brake pedal depressed 4WD shift switch : 4H to 4LO or 4LO to 4H (While actuator motor is operating.) ON Except the above OFF Without CONSULT-III Start engine. Check voltage between transfer control unit harness connector terminal and ground. VOLTAGE SPECIFICATION Connector Terminal Condition Voltage (Approx.) E143 40 - Ground Vehicle stopped Engine running A/T selector lever N Brake pedal depressed 4WD shift switch: 4H to 4LO or 4LO to 4H (While actuator motor is operating.) 0V Except the above Battery voltage Are inspection results normal? YES: GO TO 5 . NO: 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 E143 terminal 40 and ATP switch harness connector F55 terminal 8. Continuity should exist . Also check harness for short to ground and short to power. Are inspection results normal? YES: GO TO 3. NO: 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. Continuity should exist . Also check harness for short to ground and short to power. Are inspection results normal? YES: GO TO 4. NO: Repair open circuit or short to ground or short to power in harness or connectors.
  4. CHECK ATP SWITCH Turn ignition switch OFF. (Stay for at least 5 seconds.) Disconnect ATP switch harness connector. Remove ATP switch. Refer to " «COMPONENT PARTS LOCATION»(ref-320214-S41171190002009071300000) ". Push and release ATP switch and check continuity between ATP switch terminals 8 and 9. CONTINUITY CHART Terminal Condition Continuity 8 - 9 Push ATP switch Yes Release ATP switch No Are inspection results normal? YES: GO TO 5. NO: Replace ATP switch.
  5. CHECK TRANSFER CONTROL UNIT Check transfer control unit input/output signal. Refer to " «REFERENCE VALUE»(ref-320214-S34543446652009071300000) ". Are inspection results normal? YES: GO TO 6. 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.
  6. CHECK ATP WARNING LAMP Turn ignition switch ON. (Do not start engine.) Move A/T selector lever to P position. Set 4WD shift switch from 4H to 4LO or 4LO to 4H. Does ATP warning lamp turn ON while switching? YES: Inspection End. NO: GO TO " «DIAGNOSIS PROCEDURE»(ref-320214-S27671611772009071300000) ".

The vehicle can not be put into 4WD mode. (Possible hydraulic malfunction)

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