Clean and tighten your battery cables. I have a 95 cutlass supreme that did the same thing. If that doesnt fix it, the ECM may be to blame. When the ECM went in my Olds, the car would fire but only run for 2-3 seconds. Once I had the ECM replaced it was fine
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P0685 DODGE - Auto Shutdown Relay Control Circuit Failure
- Faulty Engine Control Module (ECM) power relay
- ECM power relay harness is open or shorted
- ECM power relay circuit poor electrical connection
- Faulty (ECM
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.
Check your ecm fuse, or your main power relay fuses, basically just check all the fuses under the dash and under the hood, if there are a few relays under the hood, you can try and swap the ac relay with the power relay as long as they have the same numbers on them. If all the fuses are good, it is most likely a relay, or the ignition switch itself
Is there a security light lit on the dash or a picture of a padlock an car lit ? How's the battery an cable connections ? Is there power an control from the PCM at the starter relay in the under hood fuse / relay box ? Do you know what is involved in the starting of your vehicle , the electronics ?
Circuit Description (Key Start)
When the ignition switch is placed in the Start position, a discrete signal is supplied to the body control module (BCM) notifying it that the ignition is in the Start position. The BCM then sends a message to the engine control module (ECM) notifying it that CRANK has been requested. The ECM verifies that the clutch pedal has been depressed or the transmission is in Park or Neutral. If it is, the ECM then supplies 12 volts to the control circuit of the STRTR relay. When this occurs, battery positive voltage is supplied through the switch side of the crank relay to the S terminal of the starter solenoid.
Is there a security light lit on the instrument cluster ? could be a anti-theft system problem ! Three electronic control modules involved in the starting circuit of this vehicle , BCM - body control module , PCM -powertrain control module , an theft deterrent module !
The immobilizer system functions are provided by the theft deterrent module (TDM) and the engine control module (ECM). When an ignition key is inserted into the ignition lock cylinder and the ignition is switched ON, the transponder embedded in the head of the key is energized by the exciter coil surrounding the ignition lock cylinder. This exciter coil is part of the TDM. The energized transponder transmits a signal that contains its unique value, which is received by the TDM. The TDM then compares this value to a value stored in memory. If the values match, the TDM will send the prerelease password via the serial data circuit to the ECM. If the transponders unique value is incorrect, the TDM will send the fuel disable password to the ECM.
When the ignition switch is placed in the Start position a discrete signal is supplied to the body control module (BCM) notifying it that the ignition is in the Start position. The BCM then sends a message to the engine control module (ECM) notifying it that CRANK has been requested. The ECM verifies that the transmission is in Park or Neutral. If it is, the ECM then supplies 12 volts to the control circuit of the starter relay. When this occurs battery positive voltage is supplied through the switch side of the starter relay to the starter solenoid.
If you knew how , in the under hood fuse / relay box is the
starter relay , it has a four pin socket when relay is removed ! Two should have battery voltage , one should show ground an one is control voltage from the PCM on pin 86 , pin 85 goes to ground. Pin . Pin 87 should have battery voltage an pin 30 supply's voltage to Fuse #24 marked STRTR in the under hood fuse / relay box ! Yea , if you look on the bottom or side of the relay the pins are marked ! Check for what is missing power or control an go from there .
Yes, the ECM is the last thing to replace after all other possibilities. No spark could be bad ignition coil, bad Ignition Control Module (controls the coil circuits for spark), bad plug wires, the crank and cam sensors (for ECM to determine spark timing).
Check the ICM -it can be tested at a parts store. If good, check the crank sensor.
The ECM on the jimmy, is located on the passenger side fender well by the overflow tank. But before replace the ECM, inspect the fuel pump and fuel pump relay. The ECM sends power to the fuel pump relay and if the relay has gone bad will cause the fuse to blow which will kill the the power to the ECM, in turn kill the electrical power to the ignition system.
Start by removing the fuel pump relay and swap it with another relay and see if the fuse will blow again, if is does. Disconnect the fuel sending unit wire harness at the frame and see if the fuse blows again, if the fuse stays good. Chances are your fuel pump has gone bad or the fuel filter is dirty/clogged causing your fuel pump to draw more amp and will need to be replaced or the wire harness from the frame to the sending unit has a short which is common on older Jimmy's.
be more specific.... if theres no dash lights when u turn key in on then its the main fuse under hood. if it turns over and wants to start could be ur ecm/ ignition module , ( if theres coils pretty sure its feul injected ur ecm,/or ignition module would be ur coil packs). when u turn the key in on u hear any kind of noise under trunk might take two people for that if not ur feul pump
Sounds like the ignition switch has gone bad and will need to be replaced. Turn the ignition switch to the on position again and check to see if there is power to other items like the transmission and accessories. If there are a few items that are not working, good chance that the ignition switch has gone bad and is there any security light on the dash flashing???
Another person had a similar issue with their 2003 Hyundai 1.6L engine. Their fix after looking at many things was that their ECM relay had gone bad. The relay is located in a box under the hood. The box has fuses and relays ... usually there is a legion or map of what is where on the underside of the box cap/lid. The relay is about the size of a one inch cube.