DTC P0851: Neutral Switch Input Circuit Low (Mt Model)
- OUTLINE OF DIAGNOSIS
Judge the open or short circuit of the neutral SW.
Judge NG when there is no change in the neutral SW even if the driving shift was applied. (There is neutral SW ON/OFF inversion from the vehicle speed and engine speed.)
- ENABLE CONDITION ENABLE CONDITION CHART
Secondary Parameters Enable Conditions Ignition switch ON Battery voltage "GREATER THAN EQUAL TO" 10.9 V After starting the engine 2 seconds or more Starter switch OFF - GENERAL DRIVING CYCLE
Perform the diagnosis continuously in 2 seconds or more after starting the engine.
- DIAGNOSTIC METHOD
Judge NG when the malfunction criteria below are completed 3 time or more after the neutral SW change. And clear NG if there is change in the neutral SW.
Judgment Value
JUDGMENT VALUE CHARTMalfunction Criteria Threshold Value Neutral switch signal (while changing from a to b below) OFF continues Driving condition change - Vehicle speed = 0 km/h (0 MPH) & engine speed 600 - 900 rpm
- Vehicle speed "GREATER THAN EQUAL TO" 64 km/h (40 MPH) & engine speed 1600 - 2550 rpm
a) to b) Time Needed for Diagnosis: 3 monitoring
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.
- DTC CLEAR CONDITION
- When the OK idling cycle was completed 40 times in a row
- When "Clear Memory" was performed
- MALFUNCTION INDICATOR LIGHT CLEAR CONDITION
- When the OK driving cycle was completed 3 times in a row
- When "Clear Memory" was performed
- FAIL SAFE
Cruise control command: Not allowed to command cruise control
- ECM OPERATION AT DTC SETTING
Memorize the freeze frame data. (For test mode $02)