p0320 ignition/distribution engine speed input circut. i cant figure it out..car has been sitting for two months with this problem. took car to jpc and they didnt have time to deal with it, so i need your help! msd coil packs in the car, they work fine, tested each one while the car is running. car runs for about 15-30 seconds before dying. if i do 3000 rpm neutral drops i can drive the car but thats about it. anytime it comes to a stop it stops.

any help would be apprieciated!!! thanks!


also the code only comes on once the car stalls out. its not a continuous check engine light, each time i restart, after waiting about a minute or two, the light doesnt come back on. until it stalls 30 seconds later.

 

On Board Diagnostics PCED

JD1 CHECK CKP SIGNAL SENT TO PCM

• Connect scan tool.
• Key ON, Engine OFF.
• Select RPM PID.
• Disable inertia switch and crank engine or crank engine at WOT (make certain engine will not start).

Is engine RPM displayed on scan tool while cranking?
Yes No CKP, PCM and harness working properly. Concern is elsewhere. GO to Section 3 , Symptom Charts for further direction. GO to JD2 .

JD2 CHECK TIMING COVER, CKP SENSOR AND EXTERNAL TRIGGER WHEEL (OUTSIDE TIMING COVER) FOR OBVIOUS PHYSICAL DAMAGE

• Key OFF.
• Visually inspect the timing cover, CKP sensor and external trigger wheel for obvious physical damage.

Do any parts appear physically damaged?
Yes No REPAIR or REPLACE damaged parts. GO to JD3 .

JD3 CHECK FOR PROPER CKP BIAS VOLTAGES IN PCM

• Disconnect CKP sensor.
• Key ON, Engine OFF.
• Measure voltages of CKP(+) and CKP (-) circuits individually between the CKP harness connector and battery (-) terminal.

Is each measurement between 1.0V DC and 2.0V DC?
Yes No GO to JD4 . GO to JD8 .

JD4 CHECK CKP SENSOR RESISTANCE

• Measure CKP sensor resistance between the (+) and (-) terminals. Note: CKP sensor resistance values change significantly with temperature rise.

Is resistance between 250 and 1K ohms?
Yes No GO to JD5 . REPLACE CKP sensor and RESET the KAM. REFER to Section 2, Resetting The Keep Alive Memory (KAM)

JD5 CHECK CKP CIRCUIT HARNESS SHIELD GROUND

• Note: The harness shield protects the CKP signal from electrical noise and is grounded at one end, typically near the PCM.
• Measure the resistance between the CKP harness shield and battery (-) terminal. Measure at the closest possible location to the CKP sensor.

Is resistance less than 5 ohms?
Yes No GO to JD6 . REPAIR open circuit or poor ground connection.

JD6 CHECK FOR SHORT BETWEEN CKP(+) AND CKP (-) IN HARNESS

• Disconnect PCM. Note: On vehicles equipped with 150 pin PCMs and PATS (Passive Anti-Theft System), disconnect ONLY the Engine (E) harness connector. The engine may not crank if the Transmission (T) and Body (B) connectors are disconnected.
• Measure resistance across the CKP(+) and CKP(-) pins at the CKP harness connector.

Is resistance less than 10K ohms?
Yes No REPAIR short circuit. GO to JD7 .

JD7 CRANK ENGINE AND CHECK CKP SENSOR AMPLITUDE AT PCM HARNESS CONNECTOR

• Digital multimeter on low voltage AC scale.
• Crank engine, measure voltage between CKP(+) and CKP(-) at the PCM.

Was settled voltage reading greater than 0.3V AC?
Yes No REPLACE PCM (refer to Section 2, Flash Electrically Erasable Programmable Read Only Memory (EEPROM). REPLACE CKP sensor and RESET the KAM. REFER to Section 2, Resetting The Keep Alive Memory (KAM)

JD8 CHECK FOR OPEN IN CKP HARNESS

• Note: Refer to the PCM connector pin numbers in the beginning of this Pinpoint Test.
• Key OFF.
• Disconnect PCM. Note: On vehicles equipped with 150 pin PCMs and PATS (Passive Anti-Theft System), disconnect ONLY the Engine (E) harness connector.
• Measure resistance of CKP(+) and CKP(-) circuits individually between the PCM harness connector and the CKP harness connector.

Is either resistance measurement greater than 5 ohms?
Yes No REPAIR open circuit. GO to JD9 .

JD9 CHECK FOR SHORT TO GROUND IN CKP HARNESS

• Measure resistance of CKP(+) and CKP(-) circuits individually between the CKP harness connector and battery (-) terminal.

Is either resistance measurement less than 10K ohms?
Yes No REPAIR short circuit. GO to JD10 .

JD10 CHECK FOR SHORT TO POWER IN CKP HARNESS

• Key ON, Engine OFF.
• Measure voltage of CKP(+) and CKP (-) circuits individually between the PCM harness connector and battery (-) terminal.

Is either voltage measurement greater than 2.0V DC?
Yes No REPAIR short circuit. REPLACE PCM (refer to Section 2, Flash Electrically Erasable Programmable Read Only Memory (EEPROM).

 

holy crap..

 

Ha, yea its fun diagnosing things from scratch huh, Welcome to my world every day.

Basically check your crank sensor and other components for physical obstructions or damage, then test the circuitry.. its rough

 

yea i figured out what it means..i just dont wanna do it lol.

switch the thing over to a msd box..lol..wonder if that would work.

 

got the car in the air now and looking at the cks it looks to me like its covered in oil? and above that on the idler pulley it looks like that is covered in gray antiseize?


oil pan looks a little wet too..but nothing around any of the bolts or where the supercharger ties in. just on the bottom of the pan.

 

another thing..would a viper alarm cause any of this? jpc said it could be the alarm but before i go ripping it off, wanted to get a second opinion

 

heck yeah!!!!!!! i fixed it...the old tach adapter that i never took off was shorting out next to the pcm. pulled it off and car works.

 

Sorry I couldnt get back to you sooner. But im glad you fixed it. It says in the manual to check for electrical interference.. Amazing what a simple visual inspection can find