P0850

A246E AUTOMATIC TRANSAXLE: P0705: Transmission Range Sensor Circuit Malfunction (PRNDL Input)

DTC P0705 - Transmission Range Sensor Circuit Malfunction (PRNDL Input)

DTC P0850 - Park / Neutral Switch Input Circuit

DESCRIPTION

The park/neutral position switch detects the shift lever position and sends signals to the ECM.

HINT: If the vehicle is equipped with a TVIP system, confirm that there is no problem in the TVIP system before troubleshooting.





MONITOR DESCRIPTION

The park/neutral position switch detects the gearshift position and sends a signal to the ECM.
For security, the park/neutral position switch detects the gearshift position so that engine can be started only when the vehicle is in P or N shift position.
When the park/neutral position switch sends more than one signal at a time from switch positions P, R, N, 2 or L, the ECM interprets this as a fault in the switch. The ECM will turn on the MIL.

MONITOR STRATEGY

P0705:





P0850:





TYPICAL ENABLING CONDITIONS

P0705:





P0850:





TYPICAL MALFUNCTION THRESHOLDS

P0705:





P0850:





COMPONENT OPERATING RANGE

P0705:





P0850:





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. INSPECT PARK/NEUTRAL POSITION SWITCH ASSEMBLY





(a) Disconnect the park/neutral position switch connector.
(b) Measure resistance according to the value(s) in the table below when the shift lever is moved to each position.
Standard resistance:





NG -- REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLY
OK -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (PARK/NEUTRAL POSITION SWITCH - ECM)





(a) Connect the park/neutral position switch connector.
(b) Turn the ignition switch to the ON position, and measure the voltage according to the value(s) in the table below when the shift lever is moved to each position.
Standard voltage:





HINT: *: The voltage will drop slightly due to lighting up of the back up light.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE ECM