hello everyone!! please help, fuel pump works w/12v applied,
relay is ok, fuses ok. for about 2 weeks the car was having
starting troubles until never started again, so I connect the pump
to a 12v source and got it working…but anyone could tell me
what is the real reason since I cannot run the car like that for 2
long.also if it helps I have a code 44 (ox.sensor) and the relay
for the sensor is working. please give me a hand I would
appreciated. thaks–
EDUARDO E FARRA
NAPLES,FLORIDA, United States
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
Visit the Jag Lovers homepage at http://www.jag-lovers.org for exciting services and resources including Photo Albums, Event Diary / Calendar, On Line Books and more !
In reply to a message from CHOPO sent Mon 23 Mar 2009:
Eduardo,
If the fuel pump runs when you apply 12 volts directly on
the Blue/red wire at the fuel pump connector, you will need
to work back from the fuel pump connector with a voltmeter
to determine why it is not getting 12 volts through the fuel
pump relay.
Do you get 12 volts at pin 30 (Brown/yellow) of the fuel
pump relay base from fuse C6 in right fuse box?
If yes, jump pin 30 (Brown/yellow) and pin 87 (Blue/red)
in fuel pump relay base - does the pump run continuously?
If pump does not run, fault is in the wiring / connector
between fuel pump relay and pump
If pump runs, suspect fuel pump relay is defective.
Replace / re-fit fuel pump relay
Remove oxy sensor heater relay (yellow base on firewall)
Do you get 12 volts at pin 30 (Brown/pink) of the oxy
sensor heater relay base from fuse C4 in right fuse box?
If yes, jump pin 30 (Brown/pink) and pin 87 (Blue/purple)
in oxy sensor heater relay base - does the pump run
continuopusly?
If pump runs, suspect oxy sensor heater relay is defective
Replace / refit oxy sensor heater relay
Remove EMS main relay (black base on firewall)
Do you get 12 volts at pin 30 (Brown/yellow) of the EMS
main relay base from fuse C1 in the left fuse box?
If yes, jump pin 30 (Brown/yellow) and pin 87
(White/brown) in EMS main relay base
Turn ignition ON
Do you hear the fuel pump give its half-second priming
burst? [You can repeat this many times and you (or an
assistant listening at the open filler neck) should hear the
half-second ‘whirr’ of the pump every time you switch the
ignition ON]
If yes, suspect the EMS main relay OR the EMS ECU is
defective (the latter, very unlikely but possible)
Turn ignition OFF
Replace / re-fit EMS main relay
Remove Ignition ‘ON’ relay (on your '94 it may be in a
white base on the firewall or it may be buried under the
dash behind the radio, which may make the following rather
difficult!)
Do you have battery voltage at pin 30(Brown) of the
Ignition ‘ON’ relay base?
If yes, temporarily jump pin 30 (Brown) and pin 87
(White/pink) in the Ignition ‘ON’ relay base
Do you hear the half-second priming burst from the pump
each time you jump those pins in the Ignition ‘ON’ relay base?
If yes, suspect the Ignition ‘ON’ relay is defective or
even fuse A5 in the left side fuse box - but if either is
defective, you will get NO dash lights when you turn on the
ignition, so you should have already noticed that.
By this stage, you should have found the problem.
If so or if not, post back your findings.–
The original message included these comments:
hello everyone!! please help, fuel pump works w/12v applied,
relay is ok, fuses ok. for about 2 weeks the car was having
starting troubles until never started again, so I connect the pump
to a 12v source and got it working…but anyone could tell me
what is the real reason since I cannot run the car like that for 2
long.also if it helps I have a code 44 (ox.sensor) and the relay
for the sensor is working. please give me a hand I would
appreciated. thaks
Visit the Jag Lovers homepage at http://www.jag-lovers.org for exciting services and resources including Photo Albums, Event Diary / Calendar, On Line Books and more !
In reply to a message from CHOPO sent Mon 23 Mar 2009:
Are you sure both the O2 sensor heater and fuel pump relays
are working?
The 02 sensor heater relay also powers the coil on for the
fuel pump relay so the first place I’d look would be at both
of those relays.–
The original message included these comments:
hello everyone!! please help, fuel pump works w/12v applied,
relay is ok, fuses ok. for about 2 weeks the car was having
starting troubles until never started again, so I connect the pump
to a 12v source and got it working…but anyone could tell me
what is the real reason since I cannot run the car like that for 2
long.also if it helps I have a code 44 (ox.sensor) and the relay
for the sensor is working. please give me a hand I would
appreciated. thaks
Visit the Jag Lovers homepage at http://www.jag-lovers.org for exciting services and resources including Photo Albums, Event Diary / Calendar, On Line Books and more !
In reply to a message from Bryan N sent Mon 23 Mar 2009:
Had a similar problem with my 1994 XJ40.
Found the O2 sensor relay socket had issues . Cleaned it
with CRC contact cleaner and all was well.
Alan
1994 XJ6
1977 XJS–
myrsjag
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
–Support Jag-lovers - Donate at http://www.jag-lovers.org/donate04.php –
Visit the Jag Lovers homepage at http://www.jag-lovers.org for exciting services and resources including Photo Albums, Event Diary / Calendar, On Line Books and more !
In reply to a message from myrsjag sent Mon 23 Mar 2009:
Hi Eduardo!
I had a code 44 and remember one time my car was choking while
driving. I replaced the oxy sensor and the oxy sensor heater relay
(yellow base under the hood) just in case and I have no problem
ever since. That was the only time when I got the check engine
light on since I own my car (2 years). I found a new Bosch oxy
sensor online for $120 but can’t remember the site.
You can also check the CPS too .(Crank Position Sensor)
Joe–
'94 XJ40 Miles still under 100k. Naples, FL
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
–Support Jag-lovers - Donate at http://www.jag-lovers.org/donate04.php –
Visit the Jag Lovers homepage at http://www.jag-lovers.org for exciting services and resources including Photo Albums, Event Diary / Calendar, On Line Books and more !
In reply to a message from Bryan N sent Mon 23 Mar 2009:
thanks for your help guys. I used the crc spray and everything went
fine, all of you are great!!! I printed all the others suggestions
so I can use them in the future . thanks again–
The original message included these comments:
Remove oxy sensor heater relay (yellow base on firewall)
Visit the Jag Lovers homepage at http://www.jag-lovers.org for exciting services and resources including Photo Albums, Event Diary / Calendar, On Line Books and more !
