DTC P086B-P086D
Diagnostic Instructions
DTC Descriptors
| DTC P086B 01: Neutral Position Sensor
Performance |
| DTC P086B 02: Neutral Position Sensor
Performance |
| DTC P086C 00: Neutral Position Sensor Circuit
Low Voltage |
| DTC P086D 00: Neutral Position Sensor Circuit
High Voltage |
Diagnostic Fault Information
Circuit
|
Short to Ground
|
Open/High Resistance
|
Short to Voltage
|
Signal Performance
|
Neutral Sensor 5 V Reference
|
P086C
|
P086C
|
P086D
|
-
|
Neutral Sensor Signal
|
P086C
|
P086C
|
P086D
|
P086B
|
Neutral Sensor Low Reference
|
-
|
P086D
|
P086D
|
-
|
|
| |
Circuit/System Description
The neutral position sensor is a three wire sensor, connected to
a 5 V reference circuit, a low reference circuit, and a signal
circuit. The engine control module (ECM) supplies 5 V to the
neutral position sensor, and also provides a sensor ground path on
the low reference circuit. The neutral position sensor sends a
voltage signal to the ECM on the signal circuit. The voltage on the
signal circuit will vary from a voltage less than or equal to 5 V
when the transmission is in the neutral position, to a voltage less
than or equal to 1.5 V when the transmission is in gear.
Conditions for Running the DTC
| • |
The system voltage is more
than 9 V. |
| • |
The ignition is in the RUN
position. |
Conditions for Setting the DTC
P086B
The neutral position sensor is stuck in range.
P086C
The neutral position sensor voltage is less than 0.1 V for more
than 1 s.
P086D
The neutral position sensor voltage is more than 5.2 V for more
than 1 s.
Action Taken When the DTC Sets
DTC P086B - P086D are Type A DTCs.
Conditions for Clearing the DTC
DTC P086B - P086D are Type A DTCs.
Reference Information
Schematic Reference
Manual Transmission Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Transmission System Description and Operation
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Engine Control Module Scan Tool Information for scan tool
information
Circuit/System Verification
| 2. |
Ignition ON, observe the ECM
scan tool Neutral Position Sensor parameter. Verify the gear shift
lever position matches the scan tool parameter. |
| 4. |
Operate the vehicle within the
conditions for running the DTC to verify the DTC does not
reset. |
Circuit/System Testing
| 1. |
Ignition OFF, disconnect the
harness connector of the B209 Neutral Position Sensor. |
| 2. |
Ignition OFF, test for less
than 1 Ω between the low reference circuit terminal 2 and
ground. |
| ⇒ |
If greater than the specified value, test the low
reference circuit for an open/high resistance. If the circuit tests
normal, replace the K20 Engine Control Module. |
| 3. |
Ignition ON, test for 4.8-5.2
V between the 5 V reference circuit terminal 1 and ground.
|
| ⇒ |
If less than the specified range, test the 5 V
reference circuit for a short to ground or an open/high resistance.
If the circuit tests normal, replace the K20 Engine Control
Module. |
| ⇒ |
If greater than the specified range, test the 5 V
reference circuit for a short to voltage. If the circuit tests
normal, replace the K20 Engine Control Module. |
| 4. |
Ignition ON, observe the scan
tool Neutral Position Sensor parameter is In Gear. |
| ⇒ |
If not the specified value, test the signal
circuit terminal 3 for a short to voltage. If the circuit test
normal, replace the K20 Engine Control Module. |
| 5. |
Install a 3 A fused jumper
wire between the signal circuit terminal 3 and the 5 V reference
circuit terminal 1. Verify that the scan tool Neutral Position
Sensor parameter is Neutral. |
| ⇒ |
If not the specified value, test the signal
circuit for or a short to ground or an open/high resistance. If the
circuit tests normal, replace the K20 Engine Control Module. |
| 6. |
If all circuits test normal,
replace the B209 Neutral Position Sensor. |
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic
procedure.
|
