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Ask Chad Farhat Your Own Question
Chad Farhat
Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems
Category: Ford
Satisfied Customers: 3971
Experience:  Owner at Carolina Auto Service & Sales , 20 years experience in Foreign & Domestic Vehicles
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No crank. no comm, 2003 6.0 super duty no comm with scan

Customer Question

no crank. no comm
JA: What is the model/year of your Ford?
Customer: 2003 6.0 super duty no comm with scan tool
JA: Are you fixing your vehicle yourself? What have you tried so far?
Customer: yes
JA: Anything else you want the mechanic to know before I connect you?
Customer: checked all fuses-ok can jump starter and it engages but will not start
JA: Have you checked the battery, particularly the terminal connections? Are they corroded?
Customer: checked battery and fusible links battery full charge
Submitted: 2 months ago.
Category: Ford
Expert:  Chad Farhat replied 2 months ago.

Hi, I'm Chad. Welcome to JustAnswer. I'm reviewing your question and I will be posting your reply ASAP.

Expert:  Chad Farhat replied 2 months ago.

Hey how are you

Do you have 12 volt powers on pin #16 on DLC ( data link connector where you plugged in the scanner )

Click on link to view connector pin out

When you turn the igntion switch from OFF to ON ,does the check engine light comes on for few seconds and then goes away

ALL FUSE ARE CHECKED CORRECT ?

lets start here and we go from there

Please let me know

Thank You

Chad Farhat

ASE Certified Technician

Customer: replied 2 months ago.
light on snap on scanner lights up to verify
Expert:  Chad Farhat replied 2 months ago.

OK SO WE HAVE POWER AND VERIFIES BUT NO COMMUNICATION

DID YOU UNPLUG THE PCM CONNECTOR AND CHECK THE PINS FOR ANY BURNED OUT

Number 6 & 14 pins on DLC are the CAN communications lines (RD/WH wire & PInk & yellow wire) we need to do a continuity check on them ?

Customer: replied 2 months ago.
check engine light comes on but does not go out
Expert:  Chad Farhat replied 2 months ago.

Send me vin# *****

Expert:  Chad Farhat replied 2 months ago.

Check engine light comes on and want go out we Have a pcm or pcm wiring issues ?

Expert:  Chad Farhat replied 2 months ago.

Check this recall on this year truck

Expert:  Chad Farhat replied 2 months ago.

This the wiring circuit for the PCM, PCM relay

click on link to view

Expert:  Chad Farhat replied 2 months ago.

PCM POWER RELAY LOCATION IN THE CJB(CLICK ON LINK TO VIEW PCM RELAY LOCATION

CHECK THAT RELAY AND SWAP IT WITH A KNOWN GOOD ONE , IF THE RELAY AND THE DLC CAN WIRE ARE GOOD THEN RECALIBRATE PCM OR REPLACE IT

THE DEALER WILL REFLASH FOR FREE BUT WANT REPLACE PCM FOR FREE UNDER RECALL

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Thank You
Chad Farhat
ASE Certified Technician

Expert:  Chad Farhat replied 2 months ago.

PCM RELAY LOCATION (CJB) FUSE BOX UNDER THE DRIVE SIDE STEERING

Customer: replied 2 months ago.
vin 1ftww33p03ed87966 replaced with what I think is known good one
Expert:  Chad Farhat replied 2 months ago.

oh i see was it used ?

Customer: replied 2 months ago.
Expert:  Chad Farhat replied 2 months ago.

Well they did have issue with them,most the one i got out of a junk yard were bad

I suggest sending the original and rebuild it.

Expert:  Chad Farhat replied 2 months ago.

But just make sure you inspect the connector ,get a flash light and shine inside the connector on pcm and check the pins, burned,broken or bend

Spray crc electrical contact cleaner and retest

BUT THE CHECK ENGINE LIGHT STAYING ON ,TELLS YOU NO GOOD IF THE WIRES ARE GOOD ON THE CAN LINES AND WE HAVE POWER TO IT AND IT LOOKS THAT WE DO ON PIN#16 SINCE IT IS POWER UP PCM BUT YOU STILL CA NOT COMMUNICATE

Expert:  Chad Farhat replied 2 months ago.

If more help is needed just reply back and we can continue

Please Remember To Rate ME Before You Exit Since That is How we get compensated :)

Good luck with it

Customer: replied 2 months ago.
I'm seeing the can bus wires on terminals 13 and 14 and no apparent problems
Expert:  Chad Farhat replied 2 months ago.

OK THERE IS NOTHING LEFT OTHER THAN PCM

THAT IS ALL I KNOW ON IT

Please let me know IF YOU NEED ANYTHING Else ON IT

Thank You

Chad Farhat

ASE Certified Technician