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Misfire and asd relay - 2006 Jeep Liberty

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Code P1388 and P1399

P1388 JEEP - ASD or CNG (compressed Gas) Relay Control Circuit Possible causes - Faulty ASD Relay (most common cause)
- Faulty CNG Relay
- ASD or CNG Relay harness is open or shorted
- ASD or CNG Relay circuit poor electrical connection
- ASD or CNG Relay poor ground or supply voltage condition

P1399 is a related to the P1388 failure.

Jun 27, 2016 | 2000 Jeep Grand Cherokee

2 Answers

Diagnostic port on a 1994 jeep grand Cherokee limited v 8

Check the fuel filter,nozzles and clean the injector mouth

Nov 24, 2015 | 1994 Jeep Grand Cherokee

1 Answer

Whats the codes p0685 an p0688 on a 2004 chrysler pacifica mean

P0685 CHRYSLER - Auto Shutdown Relay Control Circuit Failure

Short or open in Auto Shutdown (ASD) relay circuit
- Engine Light ON (or Service Engine Soon Warning Light)
Possible Causes
- ASD relay circuit is open or shorted
- Failed Auto Shutdown relay
- Failed ECM
Tech Notes
Check all the ECM fuses, if the fuses are OK try replacing the ASD relay.

P0688 CHRYSLER - Auto Shutdown Relay Control Circuit Low

The Front Control Module (FCM) has detected the supply voltage below an acceptable value
- Engine Light ON (or Service Engine Soon Warning Light)
Possible Causes
- ASD relay circuit is open or shorted
- Failed Auto Shutdown relay
- Failed ECM
Tech Notes
Check all the ECM fuses, if the fuses are OK try replacing the ASD relay.

Dec 29, 2014 | 2004 Chrysler Pacifica

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,

Oct 20, 2014 | Jeep Cherokee Cars & Trucks

1 Answer

P0305 2004 chrysler pacifica

Engine misfire could be anything spark plugs, bad coil, fuel pump or filter in tank, pressure regulator,ASD relay, injector or computer

Apr 02, 2014 | 2004 Chrysler Pacifica

1 Answer

1995 jeep grand cherokee laredo jerking at 50 mph

which engine? (asked now 1000 times, only 2 ever answered)

tune up time, spark parts, rotor to plugs. filters. both.

its called a 60k mile tune up solves most.

my guess, is its misfiring or

is this the ASD relay dropping out then back in, as driven.

jerked before and after CKP sensor, did you know its the last thing to fail......

see the list of ASD drops.

misfiring, can be felt, its like a misfiring chain saw, ever here a 2 stoke misfire, ratta, tata ,tat?

some call it jerking, its not, is misfiring. (3reasons ) and 25 causes.

but jerkin real, like if you cut the ignition that is and instant bog.

but if you off the key and back on , fast, that be a jerk

that is total power loss. not misfire. its loss spark and fuel.

and jerks hard.

so does loss of 12vdc to the EFI system.

so the first step is to see if its the ASD relay dropping out.

on all jeeps.. 93 to now.


automatic, shut down. (relay and EFI logic)

key point, the ASD will kill the engine, if fit sees spark is bad.

so its a chicken and egg deal.

here is the logic.

key on , crank , ASD closes, fuel injects and engine starts

then dies in seconds. or runs full time.

note that if the ECU sees spark dead, it cuts spark.

Sounds odd , huh. but is NOT.

this relay stops all car fires. (caused by this protection not in place)

Apr 02, 2014 | 1995 Jeep Grand Cherokee

1 Answer

Runs for an hour then will not start act like its vapor locked

its EFI they dont vapor lock , like carbs, not at all.
so lost spark, test spark on all cylinders.
if you lost it all , you dropped the ASD relay?
if you have spark try test fuel,. (spray)
im now posted this everytime , no spark. my 3 time now, trying to reach a new record..... LOL
no scan , tool so on your car , you do the CEL falsh code deal.
see in the fsm under emission+diagnostics.

quoting my self.... on this forum...
posted to fixya many times
ASD "automatic shut down relay"
what is it?
it cuts fuel (and spark) if the PCM thinks, there is any danger of crash and burn.
The PCM drops the ASD for many reason, this list is all years. (some are missing on early years)

1: sees the spark weak or dead on the ignitor or coil primary pin. (it knows spark is bad)
2: Crank sensor bad. or misfiring. CKP
3: cam sensor bad, or misfiring , CMP.
4: ASD input read back pin fails. (PCM commanded it but it refused to do its job)
5: same ASD output fails. i commanded it but the relay is bad. dead.
6: Immoblizer active. (failing or bad key etc,)

if the ASD drops driving or even parked idling
one of the above caused it.

the ASD has engine startup logic that is unique to JEEPs.
you must crank with in seconds or the key on is ignored by many jeeps.
you crank and the above 6 must not fail during the start event or it cuts the ASD.

note carefully, if spark is bad cranking, the ASD cuts spark 100% more dead.(funny, but very true ,read the ASD schematic)

you only get 2 seconds to get the 6 factors true or the game is all over.
if when driving, it sees one of the 5 fail, ASD drops.
in fact ASD can drop then come back. while drive, people say it cuts out.

if true, using any dirt cheap scan tool will show why,

DTCs tell you. Cmp /ckp or spark dead.
pending or live DTC
freeze frame, dtc will show what failed.
and even seeing RPM drop like a rock, faster than any crankshaft can spin down, dig?

or loss of 12vdc power to the PCM , does all this above. DIES.

Mar 08, 2014 | 1994 Jeep Grand Cherokee

1 Answer

Jerking accelerating

**** = jeeeerk.....?
no year, stated. wow ! 1993 to present.!
only Jeep GC.
no engine stated. nor transmission option type,?
stalls, all stalls end with the CEL glowing this is NORMAL the CEL
the CEL glows at key on, for self test. and at all stalls.
if you had looked closer at the cluster ,lots of lamps glow , at self test.

the jeerking (spelled wrong to fool the stupid bad words engine)
Jeerking is usually engine gross misfire, or loss of DC 12v electical power to the EFI systems. called DC power loss or battery power lost.
if all lamps in the car work , radio, heater blower, dash lamps all work
then the DC power is ok, Head lights work at STALL.?
it's not the transmission

so its just an engine stall. (RPM was 0, is the big clue there)
engine RPM = 0 is a stall.
cause by gross misfire, The PCM does many things to stop all stalls.
but cant correct gross misfire, it cant.
top reasons on jeeps is....

or the JEEP ASD relay dropped you out)
btw: ever get a tune up this decade or every 60k miles?
if not , why not?

There are all these ways for the ASD relay to drop.
here are all ASD causes.

there are tests for each drop logic path..
many are simple, did the SKIM lamp glow?
what I do after a real tune up is.

connect a scan tool and drive.
and bam, communications failure, you lost 12vdc power to the PCM.
bad 12v power. (loose fuses to PCM?) battery cable lugs GREEN?

or you get DTC errors. live or pending or freeze frame seen.
got DTCs?, BINGO.

The PCM even tells you ASD pin errors.
bad ignition coil (s)?

Feb 05, 2014 | Jeep Grand Cherokee Cars & Trucks

1 Answer

Code p1388

possible reasons for the code:

- Faulty ASD Relay

- Faulty CNG Relay
- ASD or CNG Relay harness is open or shorted
- ASD or CNG Relay circuit poor electrical connection
- ASD or CNG Relay poor ground or supply voltage condition

Sep 17, 2012 | 2001 Dodge Grand 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

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