Strange issue

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Strange issue

Postby mgs41987 » Fri Jul 28, 2017 8:19 am

Hi Guys new issue has arisen. the other day the car wouldn't start no MIL nothing just turned over and turned over, got trusty forscan out and it said it was the fuel rail pressure sensor implausible signal. so naturally i buy a genuine new sensor, replaced it and as soon as i put the ignition on dashboard came up saying ENGINE MALFUNCTION, i thought it must be to do with the new sensor but none the less the engine started first time but in limp mode with engine malfunction on the dash and traction control light.

Thinking it might clear itself i turned engine off then ignition on and the message came up again and same scenario, i got forscan out and it came up with a message of

===PCM DTC P0193-61===
Code: P0193 - FRP Sensor High Input

Additional Fault Symptom:
- Signal is Above Maximum Threshold

Status:
- DTC Present at Time of Request
- Malfunction Indicator Lamp is Off for this DTC

Module: Powertrain Control Module

Diagnostic Trouble Code details

FRP Sensor High Input

This DTC may be caused by :

Pressure regulating valves or controls

FRP sensor/wiring

Fuel injector faults

Faulty or damaged PCM.

===END PCM DTC P0193-61===

===OBDII DTC None===
Successful DTC reading, no error codes found

Module: On Board Diagnostic II

===END OBDII DTC None===

===ABS DTC U2023-E0===
Code: U2023 - Vehicle Communication Network Fault

Status:
- DTC Present at Time of Request
- Malfunction Indicator Lamp is On for this DTC

Module: Antilock braking system

Diagnostic Trouble Code details

Vehicle Communication Network Fault

Note:

DTCs that start with 'U' are faults which occur during module-to-module communication.

Modules should never be replaced based only on a 'U' code. These codes do not always indicate a problem, and can be caused by normal diagnostic functions, carried out on the vehicle.

For further diagnostic information refer to the appropriate section of eTIS.

I sent the sensor back thinking it could be faulty, put the old back in, the car wouldnt start but i got no engine malfunction or anything, new senor arrived so same scenario, it does this before you turn the engine on and it comes up in the self test, so it must be another fuse/relay/solenoid causing the issue! any body got any ideas ?
mgs41987
 
Posts: 7
Joined: Sat Jun 10, 2017 4:45 pm
Vehicle: focus 1.8tdci 2009

Re: Strange issue

Postby denbo » Wed Aug 02, 2017 7:22 pm

What vehicle? what engine, what fuel? give us something to work with.
denbo
 
Posts: 33
Joined: Mon Feb 06, 2017 3:00 pm
Vehicle: ford focus 16 zetec

Re: Strange issue update!!

Postby mgs41987 » Sat Aug 05, 2017 7:49 am

i didnt write the car etc as its next to me username but its a ford focus 2009 1.8 tdci

i was doing some voltage tests after i got the information for what pin gives what voltage at what time, with ignition on pin 1 is ground (which is correct) pin 2 is supposed to be .3v but it gives 5v and pin 3 gives 5 which is correct. as the loom looked fine i sent the ECU off for testing, the wiring diagram looks as though the FRP is only connected to the ECU, as these are known to be faulty they cloned my ecu to another as they could test it and the fault is still there.

does anybody else know what it could potentially be. i am taking the looms off today and stripping them down in case they have chaffed and joined 2 circuits together
mgs41987
 
Posts: 7
Joined: Sat Jun 10, 2017 4:45 pm
Vehicle: focus 1.8tdci 2009

Re: Strange issue

Postby denbo » Wed Aug 09, 2017 7:37 pm

Hold on here,,,,,What is the fuel pressure? I,m thinking it should be around 250 bar. More than that and it will not fire. But it will build up a high pressure if the injectors don,t open. So, are the injectors opening on initial crank? If not the pressure will increase to a dangerous level and the pcm will shut down. Do you have cam and crank sync. Throw a scope on it and see whats happening! Do you have any other fault codes in any modules. Those frp sensor v readings are wrong, as you know, earth, 0.5v, 5v. is what you need to see. My money is on the pcm. Who tested it.
denbo
 
Posts: 33
Joined: Mon Feb 06, 2017 3:00 pm
Vehicle: ford focus 16 zetec

Re: Strange issue

Postby mgs41987 » Thu Aug 10, 2017 12:55 pm

The PCM (ECU) was sent to the ecu doctor Plymouth, they said they couldn't test it but they cloned my ecu's security data over. so i have had a replacement ecu but the issue did not go away. the car runs but stuck in limp mode with new sensor and old sensor it wont start.

i will get some reading over the weekend
mgs41987
 
Posts: 7
Joined: Sat Jun 10, 2017 4:45 pm
Vehicle: focus 1.8tdci 2009


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