P1747 *
EPC, wiring, PCM
EPC solenoid circuit failure, shorted circuit or output driver
Voltage through EPC solenoid is checked. An error will be noted if tolerance is exceeded.
Short circuit causes minimum EPC pressure (minimum capacity) and limits engine torque (alternate firm).
Go To Pinpoint Test
The EPC solenoid is shorted or the electrical circuit (wiring) or the transistor (driver) inside the computer is fried. do you know how to test a computer controlled circuit ?
How to test computer transistor driver without scan tool
Do you know how to find the circuit in question ?
And you are correct about these two codes as being not related . Do you know what evaporative emission system is ?
Wells EVAP Training with Sgt Tech P0440 P0441 P0442 etc
The Evaporative Emission Control System (EVAP) is used to prevent gasoline vapors from escaping into the atmosphere from the fuel tank and fuel system. The EVAP system usually requires no maintenance, but faults can turn on the Check Engine light and prevent a vehicle from passing an OBD II plug-in emissions test.
EVAP Evaporative Emission Control System - AA1Car.com
http://www.bbbind.com/free_tsb.html you can find free wiring diagrams here . Do you know how to use a wiring diagram ?
P1451 - EVAP Control System Canister Vent Solenoid Circuit Malfunction
Monitors the canister vent (CV) solenoid circuit for an electrical failure. The test fails when the signal moves outside the minimum or maximum allowable calibrated parameters for a specified canister vent duty cycle by PCM command.
To verify normal function, monitor the EVAP canister vent solenoid signal PID EVAPCV and the signal voltage (PCM control side). With the valve open, EVAPCV will indicate 0% duty cycle and the voltage approximately equal to battery voltage. When the valve is commanded fully closed, EVAPCV will indicate 100% duty cycle and a voltage drop of 4 volts minimum is normal. Output test mode may be used to switch output ON/OFF to verify function.
This is another electrical circuit problem .
Do you know how to use a DVOM - digital volt ohm meter ?
Do you know that
P1747 (electronic press control solenoid short circuit) Is a transmission problem . This solenoid controls the fluid pressure .
SOURCE: Motor problems
Technical Description:
EVAP Control System Canister Vent Solenoid Circuit Malfunction
The EVAP system monitors the canister vent (CV) solenoid circuit for an electrical failure.
The test fails when the signal moves outside the minimum or maximum allowable calibrated parameters for a specified canister vent duty cycle by PCM command.
Symptoms: You will likely not notice any drivability problems.
Causes: A code P1451 may mean that one or more of the following has happened:
*VPWR circuit open
*Damaged canister vent solenoid
*Canister vent solenoid circuit open or shorted to ground, power, etc.
*Damaged Powertrain Control Module (PCM)
*Possible SolutionsVerify canister vent solenoid - To verify normal functioning, monitor the EVAP canister vent solenoid signal PID EVAPCV and the signal voltage
(PCM control side).With the valve open, EVAPCV indicates 0% duty cycle and a voltage approximately equal to battery voltage.
When the valve is commanded fully closed, EVAPCV indicates 100% duty cycle, and a minimum voltage drop of 4 volts is normal.
Output test mode may be used to switch output on/off to verify function.
*Replace canister vent solenoid
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SOURCE: trany does not shift right after coming to a stop
Hi,
I have found the meaning of all the codes that come up. Refer the blog link mentioned bellow:
http://www.ford-trucks.com/forums/557875-need-guidance-with-obd2-codes.html
The reasons are very self explainatory.
Thank You
SOURCE: Scanner shows P1451-- EVAP Control
it is important to also include you make, model and year with this information, ford has made different types of evap systems over the years, each with different guided dignosis and each with different resistance values as specifications.
they have also published TSB's for specific vehicles for diagnisos aid
please re post the question with all information, and i will look for it, and aasist you on this topic
as first reply, after this i can not attach more than words, that why to re post and i caan attach vehicle specific diagnosis service publications
will watch for re post
have a nice day
Jay
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