03-17-2018, 10:41 PM
is the sensor missing? OBD2 mandates this sensor, USA , 1996 and up.
by law.
it i must be there.
you key on, and CEL glows (lamp) a.k.a, MIL or SES, it glows for telling you the lamp is ok and ecu not dead, (nor last guy sold it removed the lamp to hide the BAD)
then start engine and the CEL goes out, check engine lamp = CEL , if not the ECU must be scanned next.
that is true 1996 to 2018 and beyond.
scan it next , and when the missing CKP crank sensor is plugged in again, drive and scan it again/. for errors, keep in mind not all errors glow the CEL, and that means only scan tools find all errors. (worse on canada cars they hide misfire codes, but not using a scanner, the FSM has page just on Canada and the funny rules on hiding faults and leaving the CEL turned off.
This fact is covererd in the FSM , pages on ECU and diagnostics. (free book)
to reset all codes, (dtc errors) , pull the dome fuse (key out of ignition)
wait a minute, and put the fuse back and all codes forgotten, be sure to write them down first then clear them.
P400 is bad EGR
P421, is lazy CAT
all other codes, are all very bad.
by law.
it i must be there.
you key on, and CEL glows (lamp) a.k.a, MIL or SES, it glows for telling you the lamp is ok and ecu not dead, (nor last guy sold it removed the lamp to hide the BAD)
then start engine and the CEL goes out, check engine lamp = CEL , if not the ECU must be scanned next.
that is true 1996 to 2018 and beyond.
scan it next , and when the missing CKP crank sensor is plugged in again, drive and scan it again/. for errors, keep in mind not all errors glow the CEL, and that means only scan tools find all errors. (worse on canada cars they hide misfire codes, but not using a scanner, the FSM has page just on Canada and the funny rules on hiding faults and leaving the CEL turned off.
This fact is covererd in the FSM , pages on ECU and diagnostics. (free book)
to reset all codes, (dtc errors) , pull the dome fuse (key out of ignition)
wait a minute, and put the fuse back and all codes forgotten, be sure to write them down first then clear them.
P400 is bad EGR
P421, is lazy CAT
all other codes, are all very bad.
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