Engine cranking but no start/no fault code

Tiny
MB-POWER
  • MEMBER
  • 2005 LAND ROVER RANGE ROVER
  • V8
  • 4WD
  • AUTOMATIC
  • 253,446 MILES
Engine cranking but not start. Scanned but no fault codes found, only 4X4 light is flashing. No sound of fuel pump during cranking or if ignition on.
fuel pump plug connector has been checked and found as following :
when we removed connecting plug out there are electrical signal with ignition on, but after re-connected to the fuel pump there are no signal.
fuel pump's relay is okay.

Any help please.
Thanks
Tuesday, September 5th, 2017 AT 4:06 AM

5 Replies

Tiny
STEVE W.
  • MECHANIC
  • 13,465 POSTS
Power to the pump with key on is normal, that is the prime signal. Loss of that after two to three seconds is normal as the ECM waits for a signal from the crank and cam sensors to tell it the engine has started on the initial prime of fuel and it can turn on the pump. From your description I would start by looking at the crank sensor and see if the ECM is getting a signal from it. 99% of the time, that sensor can fail and not set a code.
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Wednesday, September 6th, 2017 AT 3:11 AM
Tiny
MB-POWER
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No power to fuel pump, but when we removed fuel pump out side and connected with direct power, it works !
At the same time when we feed engine with fuel throw manifold, engine started.
I think it looks like problem with relay (relay it self or wiring) or security system.
I will replace the relay with new one and confirm to you.
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Wednesday, September 6th, 2017 AT 3:44 AM
Tiny
STEVE W.
  • MECHANIC
  • 13,465 POSTS
Security system on that vehicle shuts off both the ignition and pump so if it runs on fuel spray it is not the anti-theft.
As it runs it could be the relay or signal to it.
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Wednesday, September 6th, 2017 AT 4:43 AM
Tiny
MB-POWER
  • MEMBER
  • 80 POSTS
Good news
Fuel pump relay has been replaced with new one and it's OK now.
Thanks
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Monday, September 18th, 2017 AT 7:31 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,643 POSTS
Glad you could get it fixed, that kind of problem can be tough. Please use 2CarPros anytime we are here to help

Cheers, Ken
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Tuesday, September 19th, 2017 AT 11:05 AM

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