DTC P0851, P0852 (1.5 L Engine)

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DTC P0851: Neutral Position Sensor A Circuit Low Voltage DTC P0852: Neutral Position Sensor A Circuit High Voltage

General Description

Courtesy of HONDA, U.S.A., INC.

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 a 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. 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 neutral position sensor A output voltage is a specified voltage for a set time, the PCM detects a malfunction and stores a DTC.

Monitor Execution, Sequence, Duration, DTC Type

Execution	Continuous
Sequence	None
Duration	2.0 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

DTC: P0851

The neutral position sensor A output voltage is 0.15 V or less for at least 2.0 seconds.

DTC: P0852

The neutral position sensor A output voltage is 3.5 V or more for at least 2.0 seconds.

Possible Cause

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.

DTC: P0851

Neutral position sensor A VCC line open
Neutral position sensor A NSS1 line short to ground

DTC: P0852

Neutral position sensor A SG line open
Neutral position sensor A NSS1 line short to power

Common

Neutral position sensor A failure
PCM internal circuit failure

Diagnosis Details

Conditions for setting the DTC

When a malfunction is detected, a Pending DTC, a Confirmed DTC, and the freeze data are stored in the PCM memory. The MIL does not come on.

Conditions for clearing the DTC

The Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool Clear command.