I want know where it is I cannot find it.
Sep 21, 2020 at 7:45 PM
fuel cutoff switch location
2002 JEEP GRAND CHEROKEE
DONNIELEE THOMAS
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Hi,
There isn't a fuel cut off switch. The fuel pump is controlled via the fuel pump relay and the powertrain control module. Injection and ignition is shut down by a automatic shut down relay if the engine is not running for a period of time, there is an issue with the crankshaft position sensor, or the key is left on for an extended period without the engine running.
(see pic 1)
Can you explain what is happening?
Joe
There isn't a fuel cut off switch. The fuel pump is controlled via the fuel pump relay and the powertrain control module. Injection and ignition is shut down by a automatic shut down relay if the engine is not running for a period of time, there is an issue with the crankshaft position sensor, or the key is left on for an extended period without the engine running.
(see pic 1)
Can you explain what is happening?
Joe
Image (Click to enlarge)
Sep 21, 2020 at 8:01 PM
There isn't one. "Inertia" switches are mainly a Ford thing.
What kind of problem are you trying to solve? If it is a crank / no-start condition, first check if you have spark. If you do not, you won't have a running fuel pump either, although you are likely to have what looks like normal fuel pressure because the fuel pump still runs for one second when you turn on the ignition switch. Also listen for the hum of the pump for that one second.
If you do have spark, but no fuel pressure, a failing fuel pump is the best suspect. Unlike GM fuel pumps that commonly fail while you're driving, Chrysler pumps rarely fail that way. They almost always fail by failing to start up. You can often get them going again by banging on the bottom of the gas tank. It will usually keep running as long as the engine remains running. The pump will fail to start up again anywhere from the next time to a few months later. The problem will become worse over time.
If there is no spark, the first thing to do is read and record the diagnostic fault codes. Chrysler made doing that yourself much easier than any other manufacturer. Cycle the ignition switch from "off" to "run" three times within five seconds, leave it in "run", then watch the code number(s) appear in the odometer display. You can go here:
https://www.2carpros.com/trouble_codes/obd2/p0400
to see the definitions, or I can interpret them for you.
What kind of problem are you trying to solve? If it is a crank / no-start condition, first check if you have spark. If you do not, you won't have a running fuel pump either, although you are likely to have what looks like normal fuel pressure because the fuel pump still runs for one second when you turn on the ignition switch. Also listen for the hum of the pump for that one second.
If you do have spark, but no fuel pressure, a failing fuel pump is the best suspect. Unlike GM fuel pumps that commonly fail while you're driving, Chrysler pumps rarely fail that way. They almost always fail by failing to start up. You can often get them going again by banging on the bottom of the gas tank. It will usually keep running as long as the engine remains running. The pump will fail to start up again anywhere from the next time to a few months later. The problem will become worse over time.
If there is no spark, the first thing to do is read and record the diagnostic fault codes. Chrysler made doing that yourself much easier than any other manufacturer. Cycle the ignition switch from "off" to "run" three times within five seconds, leave it in "run", then watch the code number(s) appear in the odometer display. You can go here:
https://www.2carpros.com/trouble_codes/obd2/p0400
to see the definitions, or I can interpret them for you.
Sep 21, 2020 at 8:10 PM
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