Diesel Engine Sensors

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This list and symptoms is for diesel engines only, Engine Management Light will be on if sensor fails outside its normal working parameters, example coolant sensor tells ECU coolant is 200ºC

You really need a EOBD scan tool to test these sensors but I have listed methods for some with a multimeter.

SENSOR TYPE NORMAL SYMPTOMS HOW TO TEST
CRANKSHAFT (CPS) NON START,   OCCASIONALLY MAY CUT-OUT AND RESTART
CAMSHAFT SENSOR NON START
COOLANT SENSOR MAY BE NONSTART IF SENSOR TELLS ECU WRONG TEMPERATURE
AIR FLOW SENSOR WON'T EFFECT RUNNING ONLY USED TO MONITOR EGR VALVE ON DIESEL ENGINES  
THROTTLE PEDAL WON'T REV, MAY BE OK AGAIN AFTER RE-STARTING  
FUEL RAIL PRESSURE PROBABLY WON'T START WILL KNOCK IF DOES  
CLUTCH PEDAL ENGINE MAY JOLT AFTER GEAR CHANGE  
AIR TEMPERATURE MAY UPSET STARTING AND RUNNING SLIGHTLY  
ATMOSPHERIC MAY UPSET STARTING AND RUNNING SLIGHTLY  

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