Question about Jeep Cars & Trucks
Ouch, you dont have a $10 volt meter, ? if you dont have 12vdc to the pump cranking why replace a pump, it has no power. so.....?
which engine, we need that because its and EFI question and varies by engine. Gas or Diesel?
first off here is the dead pump checks on all EFI cars,
1: fuses are first (as is a charged battery to 12.6vdc rested)_
2: next is to scan it, scan it cranking, dont skip scans. ever. and 100x that in newer cars. it reports many failures, now. details......
3: the crank engine (yes, crank it ) and see if 12vdc makes it to the pump. does it? id bet not. (as you said no power but did you crank it?)
4: if the pump feed wire is dead now what. well check the pump drive. on old cars its a relay on newer its ELECTRONIC driven.
that means powerful transistor drive from the TIPM.
5: first is if the SKIM is glowing cranking is it? immoblizer active cuts fuel. (not sure if it cuts pump but is important this)
6: dead ASD relay, it dont close. cranking.
7: or the ASD relay drops out cranking, scan tool tells why.
me ?, I scan first, ohm the scan tells me x fuse is blown,.
or that the ASD dropped for x reasons 8 total.
does the PCD Fuel pump relay close cranking?
does the coil on said relay (meter across coil of it) go to 12vdc cranking 11v is typ.?
if not the ECU is blocking the pump relay,
that takes a scan tool to find why.
use an Innova 3160 scan tool , buy one and save a fortune guessing.
barrow, rent or buy,
cant go to shop engine is dead, right? so leaving 2 choices.
tow it or buy scan tool for less. cash.
fuse 24 looks ok but is cracked (hair line) and reads infinity on the ohm meter RX1 scale.? BINGO, we test fuse that look ok.
or check voltage on both sides of fuse cranking, 12vdc is good.
0v is bad.
The PCM has many reasons to cut the relay,
not one can be guessed at (well dead spark, sure)
it needs to be scanned.
Posted on Apr 13, 2015
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Posted on Jan 02, 2017
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
Ok...you mentioned that there is no spark coming from the coil when it's in no start...Is there power from the alternator going to the coil?
One other item...If the timing chain is worn and stretched, it is possible that the cam sensor and crank sensor are out of phase with each other, just enough where a temperature difference will change starting ability.
One question...while in no start, have you tried changing the throttle position while cranking to see if it lights at part or 3/4 throttle?
Posted on Oct 15, 2009
funny thing is I have a 2002 GTI with the exact same problem. have spent the last three days at work trying to figure things out.. best of luckn email me if you figure anything out. Beattie411@gmail.com
Posted on Mar 19, 2010
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