DTC P0850-00; Neutral Switch Input Circuit Problem: Notes

DTC P0850:00	Neutral switch input circuit problem
DETECTION CONDITION	The PCM monitors changes in input voltage from the neutral switch. If the PCM does not detect a voltage change while driving the vehicle at a vehicle speed above 30 km/h {19 mph} and the clutch pedal is pressed and released 10 times repeatedly, the PCM determines that the neutral switch circuit has a malfunction. Diagnostic support note This is a continuous monitor (CCM). The check engine light illuminates if the PCM detects the above malfunction condition in two consecutive drive cycles or in one drive cycle while the DTC for the same malfunction has been stored in the PCM. PENDING CODE is available if the PCM detects the above malfunction condition during first drive cycle. FREEZE FRAME DATA/Snapshot data is available. DTC is stored in the PCM memory.
FAIL-SAFE FUNCTION	Not applicable
POSSIBLE CAUSE	Neutral switch connector or terminals malfunction Open circuit in wiring harness between neutral switch terminal D and body ground PCM connector or terminals malfunction Short to ground in wiring harness between neutral switch terminal A and PCM terminal 1K Open circuit in wiring harness between neutral switch terminal A and PCM terminal 1K Neutral switch malfunction PCM malfunction

Fig 1: Identifying Neutral Switch Connector Terminals

Courtesy of MAZDA MOTORS CORP.