2008 Nissan Pathfinder SE
2008 TRANSMISSION Transfer (ATX14B) - Pathfinder
P1818 ACTUATOR POSITION SWITCH
Description
The actuator position switch detects the current actuator motor range. DTC P1818 will set if either of the
following occur:
Improper signal from actuator position switch is input due to open or short circuit.
Malfunction is detected in actuator position switch.
DTC Logic
DTC DETECTION LOGIC
DTC REFERENCE CHART
Diagnostic item is detected
DTC CONSULT-III when...
Improper signal from
actuator position switch is
input due to open or short
[P1818] SHIFT ACT POSI SW
circuit.
Malfunction is detected in
the actuator position switch.
DTC CONFIRMATION PROCEDURE
1. DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON.
2. Perform self-diagnosis.
Is DTC P1818 detected?
Yes: Perform diagnosis procedure. Refer to "DIAGNOSIS PROCEDURE".
No: Inspection End.
Diagnosis Procedure
1. CHECK ACTUATOR POSITION SWITCH SIGNAL
With CONSULT-III
1. Start engine.
2. Select "DATA MONITOR" mode for "ALL MODE AWD/4WD" with CONSULT-III.
3. Read out the value of "SHIFT POS SW1" and "SHIFT POS SW2".
DATA MONITOR MODE REFERENCE CHART
Monitored Display
Condition
item value
Wednesday, September 2, 2015 04:54:39
04:54:35 PM Page 1 © 2011 Mitchell Repair Information Company, LLC.
2008 Nissan Pathfinder SE
2008 TRANSMISSION Transfer (ATX14B) - Pathfinder
Vehicle stopped 4WD shift switch: 4LO ON
Engine running
SHIFT POS
SW1 A/T selector lever "N" 4WD shift switch: 2WD,
OFF
position AUTO or 4H
Brake pedal depressed
Vehicle stopped
4WD shift switch: 4H, AUTO
Engine running ON
SHIFT POS or 2WD
SW2 A/T selector lever "N"
position
4WD shift switch: 4LO OFF
Brake pedal depressed
Without CONSULT-III
1. Start engine.
2. Check voltage between transfer control unit harness connector terminal and ground.
VOLTAGE SPECIFIED CONDITIONS
Voltage
Connector Terminal Condition
(Approx.)
Vehicle stopped
4WD shift switch: 4H,
Engine running 0V
27 - AUTO or 2WD
Ground A/T selector lever "N"
position
4WD shift switch: 4LO Battery voltage
Brake pedal depressed
M153
Vehicle stopped 4WD shift switch: 4LO 0V
Engine running
44 -
Ground A/T selector lever "N" 4WD shift switch: 2WD,
position Battery voltage
AUTO or 4H
Brake pedal depressed
Fig. 44: Identifying Voltage Between Transfer Control Unit Harness Connector Terminal
And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
Wednesday, September 2, 2015 04:54:35 PM Page 2 © 2011 Mitchell Repair Information Company, LLC.
2008 Nissan Pathfinder SE
2008 TRANSMISSION Transfer (ATX14B) - Pathfinder
OK: GO TO 5.
NG: GO TO 2.
2. CHECK HARNESS BETWEEN TRANSFER CONTROL UNIT AND ACTUATOR POSITION
SWITCH
1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
2. Disconnect transfer control unit harness connector and the transfer control device (actuator
position switch) harness connector.
3. Check continuity between the following terminals.
Transfer control unit harness connector M153 terminal 27 and transfer control device
(actuator position switch) harness connector F58 terminal 23.
Transfer control unit harness connector M153 terminal 44 and transfer control device
(actuator position switch) harness connector F58 terminal 20.
Continuity should exist.
Fig. 45: Identifying Continuity Between Transfer Control Unit And Actuator
Position Switch Connector Terminals
Courtesy of NISSAN MOTOR CO., U.S.A.
Also check harness for short to ground and short to power.
OK or NG
OK: GO TO 3.
NG: Repair or replace damaged parts.
3. CHECK GROUND CIRCUIT
1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
2. Disconnect transfer control device (actuator position switch) harness connector.
3. Check continuity between transfer control device (actuator position switch) harness connector
F58 terminal 22 and ground.
Continuity should exist.
Also check harness for short to power.
Wednesday, September 2, 2015 04:54:35 PM Page 3 © 2011 Mitchell Repair Information Company, LLC.
2008 Nissan Pathfinder SE
2008 TRANSMISSION Transfer (ATX14B) - Pathfinder
OK or NG
OK: GO TO 4.
NG: Repair open circuit or short to power in harness or connectors.
Fig. 46: Identifying Continuity Between Transfer Control Device Connector F58 Terminal 22
And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.
4. CHECK ACTUATOR POSITION SWITCH
1. Remove transfer control device. Refer to "REMOVAL AND INSTALLATION".
2. Check operation by applying battery voltage to transfer control device (actuator motor)
terminals 21 and 24.
CAUTION: Do not operate actuator motor for more than 1 second.
Change the actuator motor position to "HIGH" when
installing.
Be careful not to overheat the harness.
CONTINUITY CONDITIONS
Terminal Continuity Continuity
20 - 22 YES
24 (Battery voltage) - 21 (Ground)
22 - 23 NO
22 - 23 YES
21 (Battery voltage) - 24 (Ground)
20 - 22 NO
Fig. 47: Identifying Actuator Motor Operation
Wednesday, September 2, 2015 04:54:35 PM Page 4 © 2011 Mitchell Repair Information Company, LLC.
2008 Nissan Pathfinder SE
2008 TRANSMISSION Transfer (ATX14B) - Pathfinder
Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
Yes: GO TO 5.
No: Replace transfer control device.
5. CHECK TRANSFER CONTROL UNIT
Check transfer control unit input/output signal. Refer to "REFERENCE VALUE".
OK or NG
OK: GO TO 6.
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.
6. CHECK DTC
Perform the self-diagnosis, after driving a vehicle for a while.
OK or NG
OK: Inspection End.
NG: Replace transfer control device.
Component Inspection
1. Remove transfer control device. Refer to "REMOVAL AND INSTALLATION".
2. Check operation by applying battery voltage to transfer control device (actuator motor) terminals 21
and 24.
CAUTION: Do not operate actuator motor for more than 1 second.
Change the actuator motor position to HIGH when installing.
Be careful not to overheat the harness.
CONTINUITY CONDITIONS
Terminal Continuity Continuity
20 - 22 Yes
24 (Battery voltage) - 21 (Ground)
22 - 23 No
22 - 23 Yes
21 (Battery voltage) - 24 (Ground)
20 - 22 No
Wednesday, September 2, 2015 04:54:35 PM Page 5 © 2011 Mitchell Repair Information Company, LLC.
2008 Nissan Pathfinder SE
2008 TRANSMISSION Transfer (ATX14B) - Pathfinder
Fig. 48: Identifying Actuator Motor Operation
Courtesy of NISSAN MOTOR CO., U.S.A.
3. If the inspection results are abnormal replace transfer control device (actuator motor).
Wednesday, September 2, 2015 04:54:35 PM Page 6 © 2011 Mitchell Repair Information Company, LLC.
