DTC P0850

DTC P0850  : Neutral Position Sensor A/B Incorrect Voltage Correlation

NOTE:  Before you troubleshoot, review the general troubleshooting information .

DTC (PGM-FI)

1. Problem verification

   -1. Turn the vehicle to the ON mode.

   -2. Clear the DTC with the HDS.

   -3. Move the shift lever to all driving position, then move it to the neutral position.

   -4. Check for Pending or Confirmed DTCs with the HDS.

   DTC Description	Confirmed DTC	Pending DTC	Freeze Frame
   P0850 Neutral Position Sensor A/B Incorrect Voltage Correlation

   Is DTC P0850 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 freeze data/on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the freeze data/on-board snapshot .

2. Determine possible failure area (neutral position sensor, others)

   -1. Check the parameter (s) below with the HDS.

   Signal	Current conditions
   	Values	Unit
   NEUTRAL POSITION SENSOR 1
   NEUTRAL POSITION SENSOR 2

   Are they the same voltage?

   YES 

   Go to step 3.

   NO 

   Replace the neutral position sensor .

3. Determine possible failure area (PCM, others)

   -1. Turn the vehicle to the OFF (LOCK) mode.

   -2. Jump the SCS line with the HDS.

   -3. Disconnect the following connectors.

   PCM connector B (51P)

   -4. Check for continuity between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	PCM connector B (51P): disconnected
   Test point 1	PCM connector B (51P) No. 33
   Test point 2	PCM connector B (51P) No. 39

   Is there continuity?

   YES 

   Go to step 4.

   NO 

   The NSS1 and NSS2 wires are OK. Update the PCM if it does not have the latest software, or substitute a known-good PCM , then recheck. If DTC P0850 goes away and the PCM was updated, troubleshooting is complete. If DTC P0850 goes away and the PCM was substituted, replace the original PCM .

4. Shorted wire check (NSS1 wire to NSS2 wire)

   -1. Disconnect the following connector.

   Neutral position sensor 4P connector

   -2. Check for continuity between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	PCM connector B (51P): disconnected
   	Neutral position sensor 4P connector: disconnected
   Test point 1	PCM connector B (51P) No. 33

   Test point 2

   PCM connector B (51P) No. 39

   Is there continuity?

   YES 

   Repair a short in the NSS1 wire to NSS2 wire between the PCM (B33 and B39) and the neutral position sensor.

   NO 

   The NSS1 and NSS2 wires are OK. Replace the neutral position sensor .