DTC Troubleshooting: P0852
DTC P0852: Neutral Position Sensor A Circuit High Voltage
NOTE: Before you troubleshoot, review the general troubleshooting information.

DTC Description
Confirmed DTC
Pending DTC
P0852 Neutral Position Sensor A Circuit High Voltage
    

1.
Problem verification:

Problem verification
?1.
Turn the vehicle to the ON mode.

?2.
Clear the DTC with the HDS.


?3.
Check for Pending or Confirmed DTCs with the HDS.
DTC Description
Confirmed DTC
Pending DTC
P0852 Neutral Position Sensor A Circuit High Voltage
    

Is DTC P0852 indicated?

     
YES
     
     
     
The failure is duplicated. Go to step 2.
     
NO
     
     
     
Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the neutral position sensor and the PCM. If the on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the on-board snapshot.?
2.
DTC check:

DTC check
?1.
Check for Pending or Confirmed DTCs with the HDS.
DTC Description
Confirmed DTC
Pending DTC
P0852 Neutral Position Sensor A Circuit High Voltage
    
P1708 Neutral Position Sensor B Circuit High Voltage
    

Are DTC P0852 and P1708 indicated at the same time?

     
YES
     
     
     
Go to step 3.
     
NO
     
     
     
Go to step 5.
3.
Determine possible failure area (neutral position sensor, others):

Determine possible failure area (neutral position sensor, others)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Disconnect the following connector.
Neutral position sensor 4P connector

?3.
Turn the vehicle to the ON mode.

?4.
Measure the voltage between test points 1 and 2.
Test condition
Vehicle ON mode
 
Neutral position sensor 4P connector: disconnected
Test point 1
Neutral position sensor 4P connector No. 1
Test point 2
Neutral position sensor 4P connector No. 2


Is there about 5.0 V?

     
YES
     
     
     
     
NO
     
     
     
Go to step 4.
4.
Open wire check (SG2 line):

Open wire check (SG2 line)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Jump the SCS line with the HDS, and wait more than 1 minute.


?3.
Disconnect the following connector.
PCM connector E (80P)

?4.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
Neutral position sensor 4P connector: disconnected
 
PCM connector E (80P): disconnected
Test point 1
Neutral position sensor 4P connector No. 2
Test point 2
PCM connector E (80P) No. 78


Is there continuity?

     
YES
     
     
     
The SG2 wire is OK. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good PCM, then recheck. If DTC P0852 goes away and the PCM was substituted, replace the original PCM.?
     
NO
     
     
     
Repair an open in the SG2 wire between the PCM (E78) and the neutral position sensor.?
5.
Determine possible failure area (neutral position sensor, others):

Determine possible failure area (neutral position sensor, others)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Disconnect the following connector.
Neutral position sensor 4P connector

?3.
Turn the vehicle to the ON mode.

?4.
Check the parameter(s) below with the HDS.
Signal
Current conditions
Values
Unit
Neutral Position Sensor 1
    

Is any voltage indicated?

     
YES
     
     
     
Go to step 6.
     
NO
     
     
     
6.
Shorted wire check (NSS1 line to power):

Shorted wire check (NSS1 line to power)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Jump the SCS line with the HDS, and wait more than 1 minute.


?3.
Disconnect the following connector.
PCM connector E (80P)

?4.
Turn the vehicle to the ON mode.

?5.
Measure the voltage between test points 1 and 2.
Test condition
Vehicle ON mode
 
Neutral position sensor 4P connector: disconnected
 
PCM connector E (80P): disconnected
Test point 1
Neutral position sensor 4P connector No. 3
Test point 2
Body ground


Is there any voltage?

     
YES
     
     
     
Repair a short to power in the NSS1 wire between the PCM (E67) and the neutral position sensor.?
     
NO
     
     
     
The NSS1 wire is OK. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good PCM, then recheck. If DTC P0852 goes away and the PCM was substituted, replace the original PCM.?