DTC Advanced Diagnostics: P0850 (1.5L Engine) (2023 2024)
DTC P0850: Neutral Position Sensor A/B Incorrect Voltage Correlation
General Description
Table A: Neutral position sensor output voltage
| NSS1 voltage | NSS2 voltage | |
|---|---|---|
| Neutral | 2.7 - 3.0 V | 1.35 - 1.5 V |
Neutral position sensor A and neutral position sensor B are semiconductor type that output different voltage characteristics. Each neutral position sensor outputs voltage which depends on the condition is shown in Table A. The powertrain control module (PCM) judges whether it is in neutral or not from the neutral position sensor output voltage, and uses the information for various controls and auto idle stop system control (if equipped). Neutral position sensor A is for judging the neutral, and neutral position sensor B compares their output voltage to each other for malfunction detection. When the voltage correlation of neutral position sensor A and neutral position sensor B is out of a specified range for a set time, the PCM detects a malfunction and stores a DTC.
Monitor Execution, Sequence, Duration, DTC Type
| Execution | Continuous |
| Sequence | None |
| Duration | 2.1 seconds or more |
| DTC Type | One drive cycle, MIL off |
Enable Conditions
| Condition | Minimum | Maximum |
|---|---|---|
| 12 volt battery voltage [Battery] | 10.0 V | - |
| Vehicle | ON mode | |
[ ]: HDS Parameter
Malfunction Threshold
The neutral position sensor correlation allowed voltage in Table B is specified value or more for at least 2.1 seconds.
Table B: The neutral position sensor A voltage and the neutral position sensor B voltage correlation
| Neutral position sensor A output voltage | 0.92 V or less | 1.06 V | 3.49 V |
| Sensor correlation allowed voltage | 0.20 V | 0.43 V | 0.87 V |
The neutral position sensor correlation allowed voltage calculate expression: Neutral position sensor A voltage/2 - Neutral position sensor B voltage
Possible Cause
The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
- Neutral position sensor A NSS1 line short to neutral position sensor B NSS2 line
- Neutral position sensor A failure
- Neutral position sensor B failure
- PCM internal circuit failure
Diagnosis Details
Conditions for setting the DTC
When a malfunction is detected, a Pending DTC, a Confirmed DTC, the freeze data, and the on-board snapshot are stored in the PCM memory. The MIL does not come on.
Conditions for clearing the DTC
The Pending DTC, the Confirmed DTC, the freeze data, and the on-board snapshot can be cleared with the scan tool clear command.