How can I test CRD injector pump?

PANHEAD · **Joined:** Thu Feb 26, 2015 7:26 pm **Posts:** 63

I did a timing belt, head gasket, water pump, ARP studs etc. about 4K miles ago, running better than ever since new. Loving it then after being on freeway for 3 hours, exit ramp, take right turn and just dies like it ran out of fuel. So i pump primer till its hard, bleed air etc, cranks but no start and primer is easy to push again.
How can i check injector pump??

Thanks

gmctd · **Posted:** Sat May 23, 2015 12:26 am

Engine must be running, and requires DCJ scantool DRBIII for '05, STARSCAN for '06, or AUTEL MaxiSYS or AUTEL MaxiDAS780, which is available from HARBOR FREIGHT

'05-'06 KJ CRD FSM's can be downloaded from this site:

http://colorado4wheel.com/manuals/Jeep/KJ/

Mountainman · **Posted:** Sat May 23, 2015 12:51 am

I was able to check one by holding the pointy end of a cone shaped vacuum hose adapter into the fuel line that was connected to a cheap vacuum gauge, while having my wife crank the engine. It was easy to verify that the thing was pulling more than the minimum vacuum. I can't remember the specs, but I accessed the line on the pump side of the filter.
It ended up being a bad connection on the ecu (pin was burnt from poor connection) for one of the two sensors on the fuel rail. I can't remember which one now.

flash7210 · **Posted:** Sat May 23, 2015 7:13 am

PANHEAD wrote:

I did a timing belt, head gasket, water pump, ARP studs etc. about 4K miles ago, running better than ever since new. Loving it then after being on freeway for 3 hours, exit ramp, take right turn and just dies like it ran out of fuel. So i pump primer till its hard, bleed air etc, cranks but no start and primer is easy to push again.
How can i check injector pump??

Thanks

I think at this point it's safe to assume the problem IS NOT the injection pump.

I'd be checking these first:
Camshaft sensor
Crankshaft position sensor
ASD relay and fuse
Fuel injector wire connectors

gmctd · **Posted:** Sun May 24, 2015 12:52 pm

Mountainman wrote:

I was able to check one by holding the pointy end of a cone shaped vacuum hose adapter into the fuel line that was connected to a cheap vacuum gauge, while having my wife crank the engine. It was easy to verify that the thing was pulling more than the minimum vacuum. I can't remember the specs, but I accessed the line on the pump side of the filter.
It ended up being a bad connection on the ecu (pin was burnt from poor connection) for one of the two sensors on the fuel rail. I can't remember which one now.

This is a good method of testing the internal lift pump which draws fuel from the tank thru the leaky filter head and into the CP3 Inj Pump low-pressure section

However, there is no method of testing the very-high-pressure 23000psi injection pump and injectors at home or garage
- opening any of those four injection lines can result in serious injury, maiming, and death, even at idle, with ONLY 6000psi at the injectors
- testing of the very-high-pressure section can be done if the vehicle is running, but requires a comprehensive scantool, as mentioned by name previously
- testing can also be done if the vehicle is not running by using any of those same scantools to acess data and any resultant DTC's in the ECM

And I concur: failure description does not at this time point towards the CP3 as focus of failure

flman · **Posted:** Sun May 24, 2015 4:14 pm

I can read the pressure of the pump with a generic OBDII scanner, Inova 3160 in my case.

gmctd · **Posted:** Mon May 25, 2015 1:50 am

flman wrote:

I can read the pressure of the pump with a generic OBDII scanner, Inova 3160 in my case.

Good input, but, reminder: engine must be running

flman · **Posted:** Mon May 25, 2015 7:09 am

gmctd wrote:

flman wrote:

I can read the pressure of the pump with a generic OBDII scanner, Inova 3160 in my case.

Good input, but, reminder: engine must be running

Of course, it is not a magic pump. :-)r

Mountainman · **Posted:** Wed May 27, 2015 10:07 pm

gmctd wrote:

Mountainman wrote:

I was able to check one by holding the pointy end of a cone shaped vacuum hose adapter into the fuel line that was connected to a cheap vacuum gauge, while having my wife crank the engine. It was easy to verify that the thing was pulling more than the minimum vacuum. I can't remember the specs, but I accessed the line on the pump side of the filter.
It ended up being a bad connection on the ecu (pin was burnt from poor connection) for one of the two sensors on the fuel rail. I can't remember which one now.

This is a good method of testing the internal lift pump which draws fuel from the tank thru the leaky filter head and into the CP3 Inj Pump low-pressure section

However, there is no method of testing the very-high-pressure 23000psi injection pump and injectors at home or garage
- opening any of those four injection lines can result in serious injury, maiming, and death, even at idle, with ONLY 6000psi at the injectors
- testing of the very-high-pressure section can be done if the vehicle is running, but requires a comprehensive scantool, as mentioned by name previously
- testing can also be done if the vehicle is not running by using any of those same scantools to acess data and any resultant DTC's in the ECM

And I concur: failure description does not at this time point towards the CP3 as focus of failure

Dang, I hadn't thought about the other side. So, I guess I tested part of it anyhow. Thanks for the education Gmctd :JEEPIN:

How can I test CRD injector pump?

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