Code 42 dodge neon 1996 sohc

Primary voltage to several systems, including the ignition coil, dark green wire with orange tracer. That voltage comes from asd relay. There is a fuse for asd relay. To check for voltage the engine has to cranking. The control side of asd relay, the computer has to ground it before it will energize. Did you check wiring circuits for cam and crank sensor connectors before replacing sensors? Are there any applicable trouble codes?
Are you ok with testing wiring circuits?

You don't do an ohm check . Hook a test light to battery positive an have someone crank the engine over an touch the point part of test light to the PCM circuit at the relay socket . If the test light light's the PCM is grounding the circuit . Watch this video ! Fuel Pump Electrical Circuits Description and Operation ASD relay chrysler

Usually a new computer has to be programmed. Was the computer programmed?
Voltage to the load and control side of asd relay, is hot all the time. The computer grounds the control side of asd relay for it to energize.
The code is for idle air system, the computer controls that wiring circuit.

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

CODE 12 - BATTERY BEEN DISCONNECTED. CODE 31 - EVAP SOLENOID CIRCUIT. CODE 43 - IGNITION COIL 1 AND 3 PRIMARY CIRCUIT CODE 17 - ENGINE IS COLD TOO LONG REPLACE THERMOSTAT. CODE 42 - AUTO SHUTDOWN RELAY CONTROL CIRCUIT.PROBLEM COULD BE ASD RELAY OR YOU HAVE A SHORT IN THE WIRING TO THE ASD RELAY.

12, Direct battery input to PCM was disconnected within the last 50 Key-on cycles 42 .An open or shorted condition detected in the auto shutdown relay circuit.
An open condition detected in the ASD relay output circuit.

An open or shorted condition detected in the fuel pump relay control circuit.

An open circuit between PCM and fuel gauge sending unit.

Circuit shorted to voltage between PCM and fuel gauge sending unit.

No movement of fuel level sender detected. 72, Catalyst efficiency below required level. (Same as code 64) 55, Completion of fault code display on Check Engine lamp

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

Code 42 1984 model injector circuit 1 open or shorted
1986+ models: ASD relay open or shorted

Code 12 The battery has been disconnected and the computer (ECU) has been reset.

Code 55 End of fault code list

also here is a link you may want to visit, you could print off this page and save yourself some time should you face more check engine light problems

http://www.allpar.com/fix/codes/index.html
these are only the 2 digit codes, but they have links to obd II codes as well (to anyone looking)

code 42 automatic shutdown driver (ASD) relay circuit open or shorted

A code 42 is the Auto Shutdown Relay Control Circuit....The ASD relay is located under the hood in the Power Distribution Center next to the battery. Change the ASD relay, that should fix you up. If that doesn't work...you might have to check the PCM. But replacing the ASD relay should do it.

Bryon