Good morning forum! I am the new owner of a 2007 mustang gt manual. Stock as far as I know. Car drove great for a couple hundred miles then when in serious stop and go traffic I got the wrench light car depowered then ultimately dies. First code I got had to do with the torque output code. I could turn car off and then back on and drive for short periods. After reading on forums i ultimately decided to replace complete throttle body after cleaning maf sensor, checking for vacuum leaks and i take leaks. Car drove perfect for a day and a half. Hit heavy stop and go traffic again and same issues. Attached is a list of codes at that time. I changed maf sensor just as a precaution. Made no difference. Same symptoms. Be an to wonder if I had a heat issue for ecm or alternator so I began data logging temp sensors and voltage sensors. See some weird spikes that I screen captured and wondered if anyone has any input? Thanks in advance. I’m at a loss.

 

@Mridylan

Welcome!

Here are The FORD Shop Manual Listings on Your Codes Along With PDF'S of The Diags. I Hope This Helps!

Best Regards,

KC


P0507 - Idle Air Control (IAC) System RPM Higher Than Expected

For Vehicles With Electronic Throttle Control (ETC) Description: This DTC is set when the powertrain control module (PCM) detects an engine idle speed that is greater than the desired RPM. Possible Causes:

• Intake air leak after throttle body
• Vacuum leaks
• Damaged EVAP system
• EGR valve leaks vacuum
• Damaged electronic throttle body (ETB)
• Damaged PCM

Diagnostic Aids: This DTC is informational only and it may be accompanied by other DTCs. Diagnose other DTCs first. If other DTCs are not present inspect the intake air system for air or vacuum leaks and damage. If no concerns are present, clear the DTC and repeat the self-test. For All Others Description: This DTC is set when the powertrain control module (PCM) detects an engine idle speed that is greater than the desired RPM. Possible Causes:

• IAC circuit shorted to ground
• Damaged or incorrect IAC valve
• IAC valve stuck open
• Intake air leak after throttle body
• Vacuum leaks
• Damaged EVAP system
• EGR valve leaks vacuum

Diagnostic Aids: Disconnect the IAC valve and look for little or no change in engine RPM as an indication of a stuck or damaged valve. Application Key On Engine Off Key On Engine Running Continuous Memory Vehicles With Electronic Throttle Control (ETC)
Refer to the Description, Possible Causes and Diagnostic Aids for the DTC. All others

GO to Pinpoint Test KE




P2104 - Throttle Actuator Control (TAC) System - Forced Idle

Description: The TAC system is in the failure mode effects management (FMEM) mode of forced idle. Possible Causes:
Diagnostic Aids: This DTC is an informational DTC and may be set in combination with a number of other DTCs which are causing the FMEM. Diagnose other DTCs first. Application Key On Engine Off Key On Engine Running Continuous Memory All

GO to Pinpoint Test QE




P2111 - Throttle Actuator Control (TAC) System - Stuck Open

Description: This powertrain control module (PCM) fault status indicates the throttle plate is at a greater angle than commanded. Possible Causes:

• Binding throttle body, stuck open
• TAC motor circuits are cross-wired
• TAC motor harness circuits are shorted together
• Damaged PCM

Diagnostic Aids:
Application Key On Engine Off Key On Engine Running Continuous Memory All

GO to Pinpoint Test DV

 

thank you for the information. In the images I uploaded…are those spikes an indication of anything? I tried to replicate them with with manipulation of plugs and wire harness everywhere I could see in the engine bay. The first image I took with the battery disconnected and car running. Should the alternator output be that spikey? Thank you for your time.

 

This Alternator Thread May Have Some Info to Help!

https://themustangsource.com/forums/...-phase-539499/

KC