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Ron, ASE Certified Technician
Category: Ford
Satisfied Customers: 36040
Experience:  23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs
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2002 f250: 7.3l diesel with trouble codes po670 and po683..two codes

Customer Question

I have a 2002 F250 7.3l diesel with trouble codes po670 and Po683. It is a California vehicle, but now residing in Tennessee. What do I need to do to resolve these two codes?
Submitted: 8 years ago.
Category: Ford
Expert:  Ron replied 8 years ago.




Thank you for asking your question on JustAnswer.

Both codes P0670 and P0683 could be set by a couple of things,


Wire harness
Glow plug control module

At the glow plug control module, check for battery voltage on the Red wire at terminal #9 of the Black (BK) connector from the PCM power relay circuit.

Check for a ground on the Pink/Orange (PK/OG) wire at terminal #8 of the Green (GN) connector when the Wait to Start light is on.

If there is no ground on the PK/OG wire, recheck at the Powertrain Control Module (PCM) pin 101 Violet/Orange (VT/OG). If the VT/OG wire is grounded when the key is cycled on and the Wait to Start light is on, locate and repair the open circuit in between the PCM and the glow plug control module. Start with checking for problems at connector C110 (42 terminal connector near the LH valve cover). Repair the circuit as needed and retest.