Question about 2007 Jeep Wrangler Unlimited Rubicon 2 Doors
2007 Wrangler Unlimited - Died one day last week. Checked fuses, etc. Would crank but not start. Started and ran while spraying carb cleaner in intake, indicating PCM functional, spark functional, crank sensor functional. Did not locate schrader valve to check fuel pressure at rail. Replaced fuel pump. Same result, Crank no start. No codes. Now, when attempting to start, at times the starter will continue to run until key is turned off. This lead to a dead battery quickly so now attempts to start are performed with another vehicle connected to this one. Impossible for CKP sensor to be faulty and vehicle run on carb cleaner. . . ?
Side note - Fuse 37 states it is for the Fuel Pump Relay. . . I was unable to locate a fuel pump relay. Fuse 25 is for the fuel pump. Both fuses are good, and fuse 25 has +12V with ignition on. Fuse 37 has -12V. Where might the fuel pump relay be if not in the fusebox? Alternate fusebox? Labeled as something different or using a relay that is used for something else as well?
The Start/Run relays produce a whining noise while the ignition is on, unsure if this is indicative of problems. Cannot recall hearing relay whine / hiss in all my years.
Hey Tim take a look at this, will this help ?
No Engine Crank Or No Engine Start Due To Electronic Lockup Of The WCM / SKREEM
This bulletin involves the replacement of the Wireless Control Module (WCM), and if
equipped, the replacement of the Electric Steering Column Lock (ELV). The WCM is also
referred to as the Sentry Key Remote Entry Module (SKREEM).
The customer will experience a no engine crank AND a no engine start condition. Also, the
remote keyless entry (RKE) system will not operate. This condition may be due to an
electrostatic discharge (ESD) from the ignition key into the Wireless Control Module
(WCM), causing the WCM to electronically lockup. This condition may occur more
frequently in dry and/or cold weather conditions where a sufficient electrostatic charge is
more easily produced. This condition is corrected by the replacement of the WCM
1. With the condition present (i.e. the vehicle in the no crank / no start condition), connect
the StarSCAN® scan tool to the vehicle.
2. Turn the ignition switch to the “ON” position, and power up the StarSCAN®.
3. If the WCM is electronically locked up, the StarSCAN® will display the WCM as being
4. If the no crank / no start condition is present, and the WCM is “off bus”, then reset the
WCM by temporarily removing the IOD fuse (with the key out of the ignition switch),
wait for 10 seconds and then reinstall the IOD fuse.
5. With the IOD fuse reset having been performed, verify that the vehicle will now crank,
start, and run.
6. If the condition is temporarily corrected by performing the above steps, and if the part
number of the WCM is earlier than the part number of the WCM listed in the part
reference table in the Service Bulletin Parts Required Section below, then perform the
Posted on Jun 24, 2009
Its the TIPM in the PCM. Its part of the recall. That is what's causing the fuel pump to not turn on. What ever you do, DO NOT reroute power to the fuel pump because that will fry the TIPM and cost you $500.00 to fix. Just tow it into the dealer and they will fix the recall for free.
Posted on Jul 13, 2009
Starter relay and fuel pump relays should be inside the power distribution center near the battery generally they have a map printed into the inside of the cover. sounds like the starter relay failed during testing and pump relay failed causing the no-start. Strange noise could be a connection problem on underside connection of distribution center.Often, if you try to jump "through" a dead battery it will throw voltage off and systems will not function properly. Jumping from another vehicle can also cause damage to other vehicles charging system. charge your battery and if you need more power while testing, jump to another battery not in a vehicle before you begin, that will add time before system looses power. Also leave one terminal secure enough to be functional but loose enough so that if starter again remains on, you can quickly disconnect it.
Posted on Jun 19, 2009
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Posted on Jan 02, 2017
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