Pinpoint Test R: Rev Matching Sensor (Selected Gear Sensor) Circuit Faults

WARNING: This page is about a different car, the 2023 Ford Bronco. However, it is still accessible from the selected car via links, so may be relevant.

Refer to ELECTRONIC ENGINE CONTROLS - 2.3L for schematic and connector information.

Normal Operation and Fault Conditions

The gear neutral position sensor provides an input to the PCM. The PCM uses this input when controlling the auto-start-stop system. For more information on the auto-start-stop system refer to the owner's literature and REFER to: Starting System - System Operation and Component Description .

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
PCM P086A:00	Neutral Position Sensor 'A' Circuit/Open: No Sub Type Information	Sets in the PCM when the PCM senses higher than expected voltage on the Rev matching sensor (Selected gear sensor) sensor feedback circuit, indicating a short directly to voltage.
PCM P086B:00	Neutral Position Sensor 'A' Circuit Range/Performance: No Sub Type Information	Sets in the PCM when the PCM does not detect current through the Rev matching sensor (Selected gear sensor) and there are no other Rev matching sensor (Selected gear sensor) circuit Diagnostic Trouble Codes (DTCs) set.
PCM P086C:00	Neutral Position Sensor 'A' Circuit Low: No Sub Type Information	Sets in the PCM when the PCM senses lower than expected voltage on the Rev matching sensor (Selected gear sensor) feedback circuit, indicating an open or a short directly to ground.
PCM P086D:00	Neutral Position Sensor 'A' Circuit High: No Sub Type Information	Sets in the PCM when the PCM senses higher than expected voltage on the Rev matching sensor (Selected gear sensor) feedback circuit, indicating a short directly to voltage.
PCM P086E:00	Neutral Position Sensor 'A' Circuit Intermittent/Erratic: No Sub Type Information	Sets in the PCM when the PCM does not detect current through the Rev matching sensor (Selected gear sensor) and there are no other gear neutral position sensor circuit Diagnostic Trouble Codes (DTCs) set.
PCM P08AE:00	Neutral Position Sensor 'B' Circuit Range/Performance: No Sub Type Information	Sets in the PCM when the PCM senses lower than expected voltage on the Rev matching sensor (Selected gear sensor) feedback circuit, indicating an open or a short directly to ground.
PCM P08AF:00	Neutral Position Sensor 'B' Circuit Low: No Sub Type Information	Sets in the PCM when the PCM senses higher than expected voltage on the Rev matching sensor (Selected gear sensor) feedback circuit, indicating a short directly to voltage.
PCM P08B0:00	Neutral Position Sensor 'B' Circuit High: No Sub Type Information	Sets in the PCM when the Rev matching sensor (Selected gear sensor) "A" indicates a different gear than Rev matching sensor (Selected gear sensor) "B".
PCM P08B2:00	Neutral Position Sensor 'A'/'B' Correlation: No Sub Type Information	Sets in the PCM when the Rev matching sensor (Selected gear sensor) "A" indicates a different gear than Rev matching sensor (Selected gear sensor) "B".

Possible Sources

Rev matching sensor (Selected gear sensor)
PCM
Wiring, terminals or connectors

Visual Inspection and Pre-checks

Rev matching sensor (Selected gear sensor)
Rev matching sensor (Selected gear sensor) connector.

R1 CHECK THE REV MATCHING SENSOR (SELECTED GEAR SENSOR)
- Perform the gear neutral position sensor component test :
Were any conditions found during inspection?

Yes REPAIR as necessary.

No GO to R2

R2 CHECK THE REV MATCHING SENSOR (SELECTED GEAR SENSOR) REFERENCE VOLTAGE CIRCUIT

Disconnect REV MATCHING SENSOR (SELECTED GEAR SENSOR) C1854.

Ignition ON.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C1854 Pin 1	Courtesy of FORD MOTOR COMPANY	Ground

Is the voltage between 4.8 and 5.2 volts?

Yes

GO to R3

No	If the voltage is less than 4.8 volts, REPAIR the circuit for an open or high resistance. If the voltage is greater than 5.2 volts, REPAIR the circuit for a short to voltage.

R3 CHECK THE REV MATCHING SENSOR (SELECTED GEAR SENSOR) GROUND CIRCUIT

Measure:

Positive Lead	Measurement / Action	Negative Lead
C1854 Pin 1	Courtesy of FORD MOTOR COMPANY	C1854 Pin 6

Is the voltage between 4.8 and 5.2 volts?

Yes

GO to R4

No	If the voltage is less than 4.8 volts, REPAIR the circuit for an open or high resistance. If the voltage is greater than 5.2 volts, REPAIR the circuit for a short to voltage.

R4 CHECK THE REV MATCHING SENSOR (SELECTED GEAR SENSOR) FEEDBACK CIRCUITS FOR SHORTS TO VOLTAGE

Disconnect PCM C175B.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C1854 Pin 2	Courtesy of FORD MOTOR COMPANY	Ground
C1854 Pin 3	Courtesy of FORD MOTOR COMPANY	Ground
C1854 Pin 4	Courtesy of FORD MOTOR COMPANY	Ground

Is any voltage present?

Yes	REPAIR the circuit.

GO to R5

R5 CHECK THE REV MATCHING SENSOR (SELECTED GEAR SENSOR) FEEDBACK CIRCUITS FOR SHORTS TO GROUND

Ignition OFF.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C1854 Pin 2	Courtesy of FORD MOTOR COMPANY	Ground
C1854 Pin 3	Courtesy of FORD MOTOR COMPANY	Ground
C1854 Pin 4	Courtesy of FORD MOTOR COMPANY	Ground

Is the resistance greater than 10, 000 ohms?

Yes

GO to R6

No	REPAIR the circuit.

R6 CHECK THE REV MATCHING SENSOR (SELECTED GEAR SENSOR) FEEDBACK CIRCUITS FOR OPENS

Measure:

Positive Lead	Measurement / Action	Negative Lead
C1854 Pin 2	Courtesy of FORD MOTOR COMPANY	C175B Pin 95
C1854 Pin 3	Courtesy of FORD MOTOR COMPANY	C175B Pin 58
C1854 Pin 4	Courtesy of FORD MOTOR COMPANY	C175B Pin 99

Is the resistance less than 3 ohms?

Yes

GO to R7

No	REPAIR the circuit.

R7 CHECK THE REV MATCHING SENSOR (SELECTED GEAR SENSOR) FOR CORRECT OPERATION
- Install a new shift shaft. REFER to: Gear Shift Position Sensor .
- Reconnect all disconnected connectors. Make sure they seat and latch correctly.
- Ignition ON.
- Using a diagnostic scan tool, clear the Diagnostic Trouble Codes (DTCs).
- Wait 10 seconds.
- Repeat the PCM self-test.
Is the DTC still present?

Yes GO to R8

No The system has been repaired and is operating correctly at this time.

R8 CHECK FOR CORRECT PCM (POWERTRAIN CONTROL MODULE) OPERATION

Ignition OFF.

Disconnect and inspect the PCM connectors.

Repair:
- corrosion (install new connector or terminals - clean module pins)
- damaged or bent pins - install new terminals/pins
- pushed-out pins - install new pins as necessary

Reconnect the PCM connectors. Make sure they seat and latch correctly.

Operate the system and determine if the concern is still present.

Is the concern still present?

Yes	CHECK OASIS for any applicable service articles: TSB, GSB, SSM or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new PCM. 303-14 RI

No	The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.