Question about 2000 Jeep Grand Cherokee

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Asd and fuel pump relay clicking with key on, starts and runs...ok, no codes. also only 6 volts at pin 30 of fuel pump relay, what could be causing this click! also....fan stays on w key on, and click can also be felt in the iac valve, and the a/c clutch tries to engage.

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6ya6ya
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Posted on Jan 02, 2017

SOURCE: I have a 1992 chevrolet

The pressure switch will open when freon pressure is too low, the compressor clutch is controlled by the computer or module.
The switch isn't necessarily bad, you can check it with a multimeter. The fitting it is threaded onto should have a valve inside and an O ring to seal so no freon loss should happen when removed.

Posted on Aug 23, 2008

  • 2 Answers

SOURCE: No Start. OBDii Code P2305.

i have the same problem could someone please help ? its getting cold outside and i live 30 miles from my job.

Posted on Oct 27, 2008

  • 14 Answers

SOURCE: My 1998 dodge ram 2500 will not start. I believe

pound on gas tank an see if it runs if so replace fuel pump

Posted on Mar 06, 2009

sudel
  • 90 Answers

SOURCE: Ford Fiesta 1.25 Zetec - Gears not engaging so no drive power

Sounds like your clutch cable is caught. Try new cable.

Posted on May 20, 2009

ElDopa
  • 295 Answers

SOURCE: 95 wrangler wont start

Please refer to this solution: http://www.fixya.com/cars/t1016149-1989_jeep_cherokee

It's probably the A/C relay under the hood indeed. And your battery might have gone bad too.

Posted on Aug 23, 2009

Testimonial: "thank you for your very fast responce.however it did not change.still waiting for relays.what does a/c relay do.is there a asd switch."

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2 Answers

I have a 2002 jeep liberty kj 3.7L and the fuel pump relay clicking slowly but constantly with ignition in off position? Relay already replaced, so not that. Ideas?


Are you sure that it is in fact the fuel pump relay ? With the key off no B+ voltage is supplied to the relay . Pin 86 at the base ,where the relay plugs into . Fuse #15 a 10 amp fuse is hot with ignition switch in the run or start position . Pin 85 is control from the PCM - engine computer . Pin's 30 & 87 are the load side , fuel pump being the load . If your unfamiliar with the pins i'm talking about , pull the relay out an look on the bottom ,you will see these numbers .Pin #30 will show B+ voltage all the time , pin 86 only with the key on or start .

Mar 07, 2017 | 2002 Jeep Liberty

1 Answer

Auto shut down fuse blows when I start the truck?


This information is straight out of the 1997 Breeze/Stratus/Cirrus Factory Service Manual (Yes I paid the $90 for it years ago)

__________________________________________________ _______________

Automatic Shutdown (ASD) sense - PCM Input

The ASD sense circuit informs the PCM when the ASD relay energizes. A 12 volt signal at this input indicated to the PCM that the ASD has been activated. This input is used only to sense that the ASD relay is energized.
When energized, the ASD relay supplies battery voltage to the fuel injectors, ignition coils, and the heating element in each oxygen sensor. If the PCM does not receive 12 volts from this input after grounding the ASD reley, it sets a Diagnostic Trouble Code (DTC).

Automatic Shutdown Relay - PCM Output

The PCM operates the Automatic Shutdown (ASD) relay and fuel pump relay through one ground path. The PCM operates them by switching the ground path for the solenoid side of the realys on and off. Both realys turn on and off at the same time.
The ASD relay connects battery voltage to the fuel injectors and ignition coil. The fuel pump relay connects battery voltage to the fuel pump.
A buss bar in the power distribution center (PDC) supplies voltage to the solenoid side and contact side of the relay. The ASD relay power circuit contains a 20 amp fuse between the buss bar in the PDC and teh relay. The fuse also protects the power circuit for the fuel pump relay and pump. The fuse is located in teh PDC.
The PCM controls the relay by switching the ground path for the solenoid side of the relay on and off. The PCM turns the ground path off when the ignition switch is in the Off position. When the ignition switch is in the On or Crank position, the PCM monitors the crankshaft position sensor and the camshaft position sensor signals to determine engine speed and ignition timing (coil dwell). If the PCM does not receive the crankshaft position sensor and camshaft position when the ignition switch is in teh Run position, it will de-energize teh ASD relay.
The ASD relay and fuel pump relay are located in the PDC near the battery. The inside top of the PCD cover has a label showing relay and fuse location.

ASD and Fuel Pump Relays

The following description of operation and tests apply only to the Automatic Shutdown (ASD) and fuel pump relays. The terminals on the bottom of each relay are numbered.

'------------------'
' __85 ___________'
' __87A '87 '30 ___' Sorry for the crudeness of this. This is supposed to
' __86 ___________' be the relay terminals!
'------------------'

OPERATION
- Terminal number 30 is connected to battery voltage. For both the ASD and fuel pump relays, terminal 30 is connected to battery voltage at all times.
- The PCM grounds the coil side of the relay through terminal number 85.
- Terminal number 86 supplies voltage to the coil side of the relay.
- When the PCM de-energizes the ASD and fuel pump relays, terminal number 87A connects to terminal 30. This is the Off position. In the off position, voltage is not supplied to the rest of the circuit. Terminal 87A is the center terminal on the relay.
- When the PCM energizes the ASD and fuel pump relays, terminal 87 connects to terminal 30. This is the On position. Terminal 87 supplies voltage to the rest of the curcuit.

TESTING
The following procedure applies to the ASD and fuel pump relays.
(1) Remove relay from connector before testing.
(2) With the relay removed from the vehicle, use an ohmmeter to check the resistance between terminals 85 and 86. The resistance shoud be 75±5 ohms.
(3) Connect the ohmmeter between terminals 30 and 87A. The ohmmeter should show continuity between terminals 30 and 87A.
(4) Connect the ohmmeter between between terminals 87 and 30. The ohmmeter should not show continuity at this time.
(5) Connect one end of a jumper wire (16 guage or smaller) to relay terminal 85. Connect the other end of the jumper wire to the ground side of a 12 volt power source.
(6) Connect on end of another jumper wire (16 guage or smaller) to the power side of the 12 volt power source. Do not attach the other end of the jumper wire to the relay at this time.

WARNING: DO NOT ALLOW OHMMETER TO CONTACT TERMINALS 85 OR 86 DURING THIS TEST.

(7) Attach the other end of the jumper wire to relay terminal 86. This activates the relay. The ohmmeter should now show continuity between relay terminals 87 and 30. The ohmmeter should not show continuity between relay terminals 87A and 30.
(8) Disconnect jumper wires.
(9) Replace the relay if it did not pass the continuity and resistance tests. If the relay passed the tests, is operates properly. Check the remainder of the ASD and fuel pump curcuits.

__________________________________________________ _______________

I know you said you replaced the relay, and this is a test procedure for the relay, but I have bought bad parts in the past. The description before the test procedure at least gives you an idea of what components are wired through and controlled by the relay. One of those may be faulty. Email me if you want or need wiring diagrams and I should be able to scan them and email them to you.

Jul 15, 2015 | 1992 Dodge Dakota

1 Answer

All of my relays click when power is turned on, but I have no spark or fuel


you attempted to fool the PCM. ever check fuse FIRST>?
all other non engine electrics all working, and dash warning lamps all on key on????????
The ASD, fuel and starter relays, do what? you left that out.
ok battery is good. starter is good. the relay works
but who controls the relay, well that is a chain of things
ok see here
http://www.jeep4x4center.com/knowledge-base/index.htm?utm_source=cj#service

see wiring
see starter page.
8w-11-7
the relay is not tested by jumpering 30 to 87
fuse 2 must be good
the relay good.
then (a voltmeter makes this childs play)
the relay coil is grounded on one side.
then the hot side goes to the clutch switch(m.t) or as the case may be, the A/T PRNDL switch.
my wild guess is car is A/T and if yes
page 8w-21-3 covers this
the key switch sends 12v to starter relay coil
and the PRNDL ground the starter relay coil at d13
ever wiggle the PRNDL by trying park or neutral to crank
the N contacts are virgin still and may allow cranking
if you 12vdc across the coil cranking the relay is BAD.
D11 to D13 (any voltmeter works)

Aug 02, 2014 | 1997 Jeep Wrangler

1 Answer

1999 Playmouth 4 cylinder will start after several tries. have new fuel pump, fuel filter, spark plugs and wires, checked ignition coil pack and connections and ASD and fuel pump relays. Everything checks...


I see you replaced the fuel pump , spark plugs an wires , fuel fliter an checked ignition coil pack , Connections ,ASD relay . And everything checks OK ?????? How did you check these thing's ? Testing electrical circuits with a DVOM - digital volt ohm meter ? Fuel pressure testing the fuel pump before replacing ? Does the vehicle have spark ? How about hooking up a scan tool that can view engine sensor data .A bad coolant temp sensor could cause hard starting. Did you check the dark blue with yellow trace wire at the PCM connector 2 pin 67 . This is the PCM control side of the ASD relay . Do you know how a relay works ? how to test at the relay base ? where in plugs into.
How to test computer transistor driver without scan tool

Electric Testing Techniques You Need to Know

Basic Electricity for Service Techs Ohm law Current Flow Opens Shorts
VEHICLE RELAYS Testing from the relay base

VEHICLE RELAYS Operation Diagnosis




Jun 01, 2017 | Plymouth Neon Cars & Trucks

1 Answer

No power going to the fuel pump


first check all fuses.
well if the security lamp is on, and the IMMobilizer light glows
it will never run. (by design) (2 seconds max)
so are the lights glowing?
no power going. (when,)
did you read the FSM on the staged events to get engine started.
my wild guess? (sad i have to ask) is it wont start?
1: IMMO not active
2: battery charged volts near 12.6vdc rested.
3: starter cranks fast. and ASD closes
4: ASD relay sees good spark and CKP, and CMP sensors.
5: engine starts, if #4 is good then it sustains running.
if not ASD drops out in 2 seconds. killing INJECTION.
it cuts the fuel pump too.

the PCM will throw a DTC error code (did you scan it cranking ??)
for if the ASD fails to OUTPUT 12v. at step 3.

the PCM closes it, then looks, and if output is bad, it ends this event and logs the failure..

to check the pump , it takes 2 people
one at the key, and one at the pump wires.
or you WILL miss the 2second event.

one way to avoid all that is to hold finger on the ASD relay
and keyon and see if it clicks closed.
if not ., no need to check pump ,its LAST in the chain,
if the ASD clicks and drops out, during that click the pump does run
for 2 seconds, min.,
if the ASD is dead, check the PCM control line to the ASD for
making coil energized in the ASD relay, (12vdc across it for 2seconds)
if the coil is energized, and the DTC throws, for bad ASD , it is.
if the ASD goes, hot only for 2 seconds, again use any $9
scan tool to see the error.
here is the scan too tests. most books forget.
1: scan tool connected.
2; Crank engine for 5 seconds, (min)
3: release key. BINGO, the ECU tells you why the ASD dropped out.
eg: ASD error, CMP error, CKP errors or others (spark?)
does RPM read near 250rpm cranking? on the scan tool?
Is TPS throttle angle near 100% (cutting fuel) ? bad tps. (cut wires)


fixing cars without a $9 scan tool , as sold on feabay is 100x harder.
get the tool and use it.
they rent them cheap or loan them for free.
not to be confused with a code reader, which are near useless.
imo.....


Feb 11, 2014 | 2004 Jeep Grand Cherokee

1 Answer

I have a 92 wrangler 4.0 six 5 speed. It would not start and the fuel pump is quite noisy. I could not hear it. So I check the relay and replaced it with a new spare I carry and nothing I smacked the gas...


the ASD relay shuts off 3 things
1 spark
2: fuel pump
3: and kills injector power.

you guessed and he guessed.
so>>>>
when the car cranks and not start, we scan it next
or if no scan tool, you are left with the key on 3 times get codes test/

if you key on and the CEL lamp is dead that means the ECU is dead
or fuse bad, cracked or rusty.

when the pump goes dead, make sure the ASD energizes
or its all just a waste of time back aft.
the ASD closes for about 2 seconds,
the pump runs too.
if the ECU sees errors during the cranking for 2 seconds.
the ECU drops the ASD and PUMP dead.
by law. too. the anti crash and burn logic is inside the ECU/PCM

the 91-92 ,we have no cheap scan tools until 1993.so....
to fix any modern car EFI it takes a scan tool or lots of labor
so get in the car, crank for 5 seconds as that service manual chapter 8d tells you, then release the key, then turn off and on 3 times
inside 3 seconds, and see the CEL flash out codes.
(no DRB scan tool that is all you get there)
if no hope still.
see the 7-8 ways the ASD Can drop here.
your car is older, and less ways to drop out.

ALSO
you said smack tank, sure.
but ment , smack it, then get in car and pump runs 2 seconds key on, right,,
did you consider the ground wire to the pump is bad.?
did you condsider the power wire or pins bad, in cars harness
and the smacking jarred thosE>?

I use a voltmeter, to find all this when failed.
my guess, your mech, didnt do that first?
if he did, and 12vdc is across pump for 2 seconds pump is bad.
if he did and 0v or low, low volts is across pump pins the its not the pump or is wire, connectors, to pump (harness et al)
or ASD DID THIS ON PURPOSE>

next would be measure all 4 ASD pins,
see whats going no here, and pump relay pins
while failed.
Diagnosing, it after it self cures it self is near impossible.

Mar 07, 2017 | 1992 Jeep Wrangler

1 Answer

30amp auto shutdown fuse blows is it alternater


The ASD relay supplies battery voltage (12+ volts) to the fuel injectors and ignition coil(s). With certain emissions packages it also supplies 12-volts to the oxygen sensor heating elements. The Fuel Pump Relay is a separate relay controlled by the ASD relay input to the PCM. Fuse #12 (10amp) provides 12 volts to the coil side of both the relays and the ignition switch. Fuse #6 (30 amps) supplies 12 volts to the output side of the relay. Fuse #16 (15 amp) from the relay output to the Oxygen Sensors and Fuse #26 (15 amp) relay output to the PCM. Fuse #24 (20 amp) is Fuel pump relay output to fuel pump. Fuse #19 (10 amp) supplies 12 volts direct to the PCM.
look for burned or melted wires in the offending circuit.
sounds like you wiggled a wire while installing new relay.

Mar 06, 2013 | Cars & Trucks

2 Answers

No fuel pressure till the asd and the fuel pump relay click about 30 -40 seconds after trying to start with the key in the run position ive tested fuel pressure ,,,none till i hear the relays click and...


This is a delay to power the fuel pump. You need to check the output from the ECU/ECM. check for any error codes, check if there is power from the switch. Once the engine runs , you need to see if there is any error codes or faulty symptoms.

Sep 30, 2011 | Cars & Trucks

3 Answers

I have a 02 grand caravan, there is fuse call asd that keeps on blowing.


Well in a short term, you have a short circuit somewhere. Here is a detailed toturial for you. Please rate this post, thank you.

Automatic Shutdown (ASD) sense - PCM Input

The ASD sense circuit informs the PCM when the ASD relay energizes. A 12 volt signal at this input indicated to the PCM that the ASD has been activated. This input is used only to sense that the ASD relay is energized.
When energized, the ASD relay supplies battery voltage to the fuel injectors, ignition coils, and the heating element in each oxygen sensor. If the PCM does not receive 12 volts from this input after grounding the ASD reley, it sets a Diagnostic Trouble Code (DTC).

Automatic Shutdown Relay - PCM Output

The PCM operates the Automatic Shutdown (ASD) relay and fuel pump relay through one ground path. The PCM operates them by switching the ground path for the solenoid side of the realys on and off. Both realys turn on and off at the same time.
The ASD relay connects battery voltage to the fuel injectors and ignition coil. The fuel pump relay connects battery voltage to the fuel pump.
A buss bar in the power distribution center (PDC) supplies voltage to the solenoid side and contact side of the relay. The ASD relay power circuit contains a 20 amp fuse between the buss bar in the PDC and teh relay. The fuse also protects the power circuit for the fuel pump relay and pump. The fuse is located in teh PDC.
The PCM controls the relay by switching the ground path for the solenoid side of the relay on and off. The PCM turns the ground path off when the ignition switch is in the Off position. When the ignition switch is in the On or Crank position, the PCM monitors the crankshaft position sensor and the camshaft position sensor signals to determine engine speed and ignition timing (coil dwell). If the PCM does not receive the crankshaft position sensor and camshaft position when the ignition switch is in teh Run position, it will de-energize teh ASD relay.
The ASD relay and fuel pump relay are located in the PDC near the battery. The inside top of the PCD cover has a label showing relay and fuse location.

ASD and Fuel Pump Relays

The following description of operation and tests apply only to the Automatic Shutdown (ASD) and fuel pump relays. The terminals on the bottom of each relay are numbered.

'------------------'
' __85 ___________'
' __87A '87 '30 ___' Sorry for the crudeness of this. This is supposed to
' __86 ___________' be the relay terminals!
'------------------'

OPERATION
- Terminal number 30 is connected to battery voltage. For both the ASD and fuel pump relays, terminal 30 is connected to battery voltage at all times.
- The PCM grounds the coil side of the relay through terminal number 85.
- Terminal number 86 supplies voltage to the coil side of the relay.
- When the PCM de-energizes the ASD and fuel pump relays, terminal number 87A connects to terminal 30. This is the Off position. In the off position, voltage is not supplied to the rest of the circuit. Terminal 87A is the center terminal on the relay.
- When the PCM energizes the ASD and fuel pump relays, terminal 87 connects to terminal 30. This is the On position. Terminal 87 supplies voltage to the rest of the curcuit.

TESTING
The following procedure applies to the ASD and fuel pump relays.
(1) Remove relay from connector before testing.
(2) With the relay removed from the vehicle, use an ohmmeter to check the resistance between terminals 85 and 86. The resistance shoud be 75±5 ohms.
(3) Connect the ohmmeter between terminals 30 and 87A. The ohmmeter should show continuity between terminals 30 and 87A.
(4) Connect the ohmmeter between between terminals 87 and 30. The ohmmeter should not show continuity at this time.
(5) Connect one end of a jumper wire (16 guage or smaller) to relay terminal 85. Connect the other end of the jumper wire to the ground side of a 12 volt power source.
(6) Connect on end of another jumper wire (16 guage or smaller) to the power side of the 12 volt power source. Do not attach the other end of the jumper wire to the relay at this time.

WARNING: DO NOT ALLOW OHMMETER TO CONTACT TERMINALS 85 OR 86 DURING THIS TEST.

(7) Attach the other end of the jumper wire to relay terminal 86. This activates the relay. The ohmmeter should now show continuity between relay terminals 87 and 30. The ohmmeter should not show continuity between relay terminals 87A and 30.
(8) Disconnect jumper wires.
(9) Replace the relay if it did not pass the continuity and resistance tests. If the relay passed the tests, is operates properly. Check the remainder of the ASD and fuel pump curcuits.

__________________________________________________ _______________

I know you said you replaced the relay, and this is a test procedure for the relay, but I have bought bad parts in the past. The description before the test procedure at least gives you an idea of what components are wired through and controlled by the relay. One of those may be faulty. Email me if you want or need wiring diagrams and I should be able to scan them and email them to you.

I hope this helps.

Please rate this post, thank you

Apr 07, 2011 | Dodge Grand Caravan Cars & Trucks

1 Answer

My 98 dakota wont fire


Check your Automatic Shutdown Relay in your fuse and relay box under the hood by the battery. The power supplied to the fuel pump, ignition coil, fuel injectors,  and parts of the power module is controlled by the logic module through the Automatic Shutdown Relay (ASD); the idea is to shut off fuel pressure and the ignition systems when the key is turned off to prevent fires, dieseling, and other problems.
The ASD relay is closed (allowing power to flow through it) when the ignition is first turned on. If the signal from the ignition reference is lost while the engine is running, the logic module cuts power to the ASD, which in turn removes power from the fuel pump, ignition coil, injectors and those parts of the power module.  This causes the engine to shut down.

The logic module monitors the relay driver.  If it senses that the relay driver is not responding correctly it will trigger a code. If the logic module does not sense an absence of current when the circuit is open, or 12 volts DC when the circuit is closed, it knows that the circuit is open or shorted, and triggers code 42. Failure of the automatic shutdown relay is often shown as inexplicable stalling or refusal to start. Good luck and hope this helps lead you in the right direction. Hint: The ASD can be triggered by a broken wire or short in another place, e.g. the fuel pump. 

Jul 04, 2009 | 1998 Dodge Dakota

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