Mechanics

STARTING ISSUE

1999 Jeep Grand Cherokee • 150,000 miles

I have a 99 grand Cherokee Laredo that will not start. It turns over just fine. I have no gauge response inside(no fuel reading, tank is full). I have tested the fuses and relays under the hood and under the drivers side dash- no issues. I tested the wiring down to the fuel pump and I get no power to the pump with the key on or trying to start the car. No fuel to the fuel rail obviously since no power to the pump. I have no codes as my son disconnected the battery to tow it the 100 or so miles to my house. Any ideas would be appreciated. I was looking in the area of the crank sensor or the cam sensor. These two just don't make sense to me as it would seem that they should be rotating in order to send a signal to the PCM.
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Daffyheavyd
November 16, 2013.



Which engine do you have?
Fuel pump not getting power seems to be the main cause and it most probably is a wiring issue.
Did you try starting fluid and are you getting sparks at the spark plugs?

KHLow2008
Nov 17, 2013.
I have the 4.0 inline 6 with fuel injection. I tested the coil rail like the manual explained and the test passed.

Tiny
Daffyheavyd
Nov 17, 2013.
The diagram shows the fuel pump relay schematics.

With a test light or DVOM, check the relay for battery voltage at the Violet/White wire. Should be hot at all times.
With ignition ON, the Ornge/Dark blue wire should have battery voltage.
Apply battery voltage to the Dark Green/Black to test if the fuel pump runs.

KHLow2008
Nov 19, 2013.
Violet/White wire has no power, orange/dark blue has power with key on, I direct connected the fuel pump with a jumper to the battery and the pump runs.

Tiny
Daffyheavyd
Jan 11, 2014.
If the Violet/White wire does not have any battery voltage, it means you have a power disruption. Check the 20 A (fuse # 24 in power distribution center.)

KHLow2008
Jan 19, 2014.
All of the fuses and relays have been checked with a meter or replaced, still nothing.

Tiny
Daffyheavyd
Jan 20, 2014.
I have also checked the crank sensor and the cam sensor as per the manual, no defects noted. I seem to have completed all of the checks in the manual except for the dealer check of the PCM. The Jeep/Chrysler dealers that are in the area are not at all reputable, hence me trying to repair this myself. I would have to drive over 200 miles to find a decent dealership.

Tiny
Daffyheavyd
Jan 20, 2014.
Try using a fused wire to apply battery voltage to the Violet/White to test if it works.

KHLow2008
Jan 30, 2014.
Used a fused(7 amp) wire and applied battery voltage to violet/white wire as instructed, still no power. Sorry for such long periods between responses but the car is outside and I live in a high snow area so I have to work when I can.

Tiny
Daffyheavyd
Feb 17, 2014.
Used a fused ( 7 amp) wire and applied battery voltage as described. Still no power.

Tiny
Daffyheavyd
Feb 22, 2014.
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