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Fuse 30amp What does a 20amp PCM/asd fuse do

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Posted on Jan 02, 2017

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SOURCE: Battery discharges over night. I have checked all

first check if battery is good and if your not leaving any thing on and check your battery terminals to be clean and tightly screwed to the battery. then turn on your vehicle and dissconect the possitive cable on ur battery. if the car turns off, youll need to replace your alternator

Posted on Oct 15, 2009

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ASD FUSE BLOWS, BUT ONLY WHEN DRIVING. Jeep WILL IDLE ALL DAY WITHOUT IT BLOWING.


which engine? 4.0L? which trans, stick or a/t?
can you show the location of the fuse exactly.
each fuse has number and the schematics show only the F number.
is the fuse in the front PDC box, under hood>?
PDC fuse F9 blows, 30amp fuse???? no lower.

need exact fuse to wax smart, i do not have the oper guide that shows, names.
1: wires to it or to PCM shorted that line.
2:PCM bad.
3: OR SOME THING CONNECTted to PCM is shorted.
finding intermittent can be hard, i use, tools that allow me monitor those lines, an ammeter (clamps on wires) id check for wire damage first.
things that can overload the PCM are:
the Alternator Field source pin,
the ISC motor.
both 0xy sensors the heater can not be shorted.
the speed control servo,
in all cases wires too not shorted.
its not the injectors it has its own fuse f28
all comments usa car and guess 4L
now my wild guess, the 02 wires are melted and touching hot exhaust, seen vast times.


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May 26, 2016 | 2003 Jeep Wrangler

1 Answer

Have a 2004 jeep Cherokee that has a p1389 code in


gee 1, last year of Cherokee is 2001, so you meant Grand right??????
gee2, wont start or stalls, no other symptoms????? just 1 DTC, no others using a real scan tool? that be first huh?
Geewise 3, what engine, wow, wrong car, no engine or country.?

the FSM covers this, and the ASD has 8 ways to trip off line'
UP TO 8 ways , just like old wonder bread had.

answering for 2004 GC, (i actually look it up in the real book)
not google butchered DTCs.
P means power train, 1 means factory codes.
a 3 coin toss lands...
2004 GC, vin N, 4.7L v8 automatic,


it reads. verbatim.
Trouble Code: P1389
No Auto Shutdown Relay Output Voltage To PCM
Number of Trips to Set Code: 1
  • Catastrophicmonitor failure.
Trouble Code Conditions:
Engine cranking; and the PCM did not detect any voltage on the ASD Relay Output circuit to the PCM during the CCM test.
Possible Causes:
  1. ASD relay connector is damaged, loose or shorted
  2. ASD relay output circuit is open between the relay and PCM
  3. ASD relay power circuit is open (test power from Fused B+)
  4. ASD relay is damaged or has failed
  5. PCM has failed (nah)


it means, to me.
  • the relay is unplugged
  • or fuse blown "fused B+" (a top reason, world wide)
  • the relay is bad.

my buds ASD page,

http://www.fixkick.com/Jeeps/ASD.html

Oct 20, 2014 | Jeep Cherokee Cars & Trucks

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

1 Answer

Which relay under the dash controls the fuel pump


Only the PCM and the fuel pump relay power the pump.
If the engine runs on starting fluid, we can assume the ASD relay is working because the coils have voltage from it.
You need to check to see if the pump relay has power from a 20amp fuse and a ground signal from the PCM. If it does, and you have power to the pump, the pump has failed.

Aug 28, 2012 | 2000 Dodge Caravan

2 Answers

My ASD fuse is making a clicking noise and vibrating. What is the function of this fuse?


ASD fuse is called an AUTOMATIC SHUT DOWN FUSE. 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).

May 18, 2011 | Jeep Cherokee 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

30amp aux fuse blown 20 amp brake/hazz and 20amp turn blown 30amp brake blown i'm thinking bare spot in wireing someware what do you think?


that is a lot of blown fuses, start with grounds engine to batt and engine to body, then battery main to starter, i have a suspicion that when you crank the truck the voltage is being routed into the body and light circuits

Nov 10, 2010 | 1997 GMC Sierra

1 Answer

Battery discharges over night. I have checked all the fuses in the engine compartment and I am getting a drain on the following fuses, 20amp Stop Lamps, 40amp Headlamps, 40amp Park Lamps & 30amp...


first check if battery is good and if your not leaving any thing on and check your battery terminals to be clean and tightly screwed to the battery. then turn on your vehicle and dissconect the possitive cable on ur battery. if the car turns off, youll need to replace your alternator

Oct 15, 2009 | 2001 Chrysler Sebring

1 Answer

Blown Fuse in 1995 Stratus after Accident


You have a direct short to ground. Try tracing/wiggling wires and disconnecting sensors/relay that are involved one at a time to determine where short is.

Mar 20, 2009 | 1995 Dodge Stratus

1 Answer

Blowing Fuse in 1995 Dodge Stratus after accident


You must have damaged the wiring loom to these items and the probable cause is the live wires are earthing to the car body or other wires. Assuming you do not have a workshop manual it will be a case of tracing the wires from each item and inspecting the casing and wiring condition all the way to the fuse board.Good Luck

Mar 20, 2009 | 1995 Dodge Stratus

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