Question about 2003 Jeep Liberty

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F/C P0685 Replacede the ASD relay and need to know if the computer needs to be reset?

Had F/C P0685 AND REPLACED RELAY. DOES THE COMPUTER NEED TO BE RESET?

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You can reset it by disconnecting the battery for a couple minutes and reconnecting it. This will turn off the engine light and reset the adaptive memory.

Posted on May 30, 2009

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1991 Dodge Dakota 2.5 liter 4 cyc blew fuse I replaced fuse no start have replaced pick up coil ,coil,plugs ,wires, cap,rotor,fues all good still no spark and no start helllppppp please!!!!!


Make sure battery has a full charge. Did you check primary voltage to ignition coil, engine cranking, dark green wire with orange tracer? Use a test light, is it hot? The voltage comes from asd relay, check voltage and ground circuits. The load side of relay is that line with arrowhead, that circuit is fuse protected and hot all the time. The control side of relay is the left side in diagram, has to have voltage and ground. The voltage appears to come from ignition switch on or cranking. Grounded by computer.
The distributor has a sensor in it that sends rpm signal to computer, w/o that signal the computer won't ground the asd relay and you get nothing. The asd relay sends voltage to several systems. Just my opinion. Any applicable trouble codes?
ignition coil primary voltage-1anaufhylhxspep0buiq5jhw-2-0.jpg

May 29, 2017 | Dodge Cars & Trucks

1 Answer

2004 pt cruiser keeps blowing fuel pump fuse,replaced fuel pump, no change.runs rough at idle and stalls,blows fp fuse,also replaced ign.coil,plug wires and plugs also changed relays


There are two fuses for the fuel pump relay. One fuse is load side of relay, that fuse also sends voltage to load side of asd relay, the asd relay sends voltage to several systems, two of which are the fuel injectors and ignition coil. I'm not telling you to replace, anything, but, you need to do some testing.
The other fuse goes to control side of relay, smaller amp fuse. I don't know the amp rating of the fuse that keeps blowing.
See that fuse, it supplies voltage to load side of fuel pump relay and also to asd relay.
26322929-c15bjyrfwzlf33vqjpu1ik1c-2-0.jpg

Oct 22, 2016 | 2004 Chrysler PT Cruiser

2 Answers

Wont start2004 dodge grand caravan sxt code p0685 show on dash


P0685 DODGE - Auto Shutdown Relay Control Circuit Failure
Possible causes - Faulty Engine Control Module (ECM) power relay
- ECM power relay harness is open or shorted
- ECM power relay circuit poor electrical connection
- Faulty (ECM
Possible symptoms:
Engine Light ON (or Service Engine Soon Warning Light) P0685 Dodge Description: Short or open in Auto Shutdown (ASD) relay circuit, this relay is under the hood in the relay center.

Oct 14, 2016 | 2004 Dodge Grand Caravan

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
Symptoms
- 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
Symptoms
- 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

Why after replaced fuel pump and filter and relay the pump will cycle when the key is turned but won't start. It will do this twice and then the computer has to be reset. Then the pump will cycle ag


The engine computer must see oil pressure or engine RPM to turn the pump relay on. Otherwise you only get power from the relay when the key switch is first turned on.
You could try to bypass the pump relay to see if the engine will run.

Sep 14, 2014 | 1994 Plymouth Sundance

1 Answer

2004 chrysler pacifica stop running at stoplight. Will turn over but will not start.


It is very possible that the relay had just shorted out and over heated.But you would want to look closely at the wires under the fuse block to make sure they did not over heat and cause the insulation to melt away.Replace # 37 with a new one and try it ,if everything else looks ok.

Aug 20, 2014 | 2004 Chrysler Pacifica

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

I have a 2003 dodge dakota. 4.7l. I get codes p0685 and p0688. No start no spark. Relay is good. But voltage drops when using a voltage meter on one of the grounds in the pdc. Any live wire and that ground...


P0685 DODGE - Auto Shutdown Relay Control Circuit Failure
Symptoms - 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. P0685 DODGE Description Short or open in Auto Shutdown (ASD) relay circuit

P0688 DODGE - Auto Shutdown Relay Control Circuit Low
Symptoms - 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 DODGE Description The Front Control Module (FCM) has detected the supply voltage below an acceptable value

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My 1995 jeep grand cherokee died while driving,found that computer was bad,replaced,all was well for a day or so,now died again with exact symptoms,was told that a bad sensor may be taking out...


I need to know all the fault codes you have received on testing. I really doubt that any sensor is taking out the computer, worked this type of repair for 20+years and have never seen that happen, not once.

Jun 25, 2017 | 1995 Jeep Grand Cherokee

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