Author Topic: wont turn ,wont start ,no communication with ECU fault P1678.C1611.C1612.C1702  (Read 1219 times)

0 Members and 1 Guest are viewing this topic.

  • *
  • Posts: 3
hi everybody, anyone had somthing similar??
wont turn ,wont start ,no communication with ecu fault P1678.C1611.C1612.C1702
Battery good,starter ok,ignition key looks fine as i can hear click relay when try start,
Have send power signal to starter it turn but still no start.
so for me looks ECU, or ABS or CAN wire broke???
Any ideas?Any wiring diagram? or ECU pinout?
thanks


  • 2013 hyundai i30 1.4 GD

  • *
  • Posts: 2,178
  • au Australia
    Ipswich
hi everybody, anyone had somthing similar??
wont turn ,wont start ,no communication with ecu fault P1678.C1611.C1612.C1702
Battery good,starter ok,ignition key looks fine as i can hear click relay when try start,
Have send power signal to starter it turn but still no start.
so for me looks ECU, or ABS or CAN wire broke???
Any ideas?Any wiring diagram? or ECU pinout?
thanks
No, but I'm confused with the no turn, starter ok? What lead up to this event?
  • 2008 i30 SLX CRDi Auto, 2010 i30CW SLX CRDi Auto. 2008 i30 CRDi SX manual, Welly

starter tested 100%
question. what could cause not communicate ECU?
broken wire, abs unit ,electric power steering?
immo looks ok.
but not crank
no start when push
  • 2013 hyundai i30 1.4 GD

  • *
  • Posts: 2,178
  • au Australia
    Ipswich
Sorry, I have no idea, this is way way outside my knowledge, So it's one of these button type soft start vehicles.

sorry Bud.

  • 2008 i30 SLX CRDi Auto, 2010 i30CW SLX CRDi Auto. 2008 i30 CRDi SX manual, Welly

  • *
  • Posts: 1,817
  • au Australia
    Samford Valley
ECU will not stop it cranking.

The most common causes of this P1678 code being stored are due to a defective input speed sensor or output speed sensor. Other common causes include shorted, open, corroded, or damaged wiring circuits or connectors.

But ignore that for the moment , you are overthinking the problem.
-trace battery connections, couple of fuses on the +ve terminal, if need be, put jumper on to starter SOLENOID after you make sure you have power available to the starter MOTOR. It should crank.

Just make sure that Im not overthinking: First check is always the battery? Put lights on and try to crank_ do lights go out? Eg crook battery,
« Last Edit: April 14, 2018, 23:00:36 by nzenigma » »
  • Every FD model; BMW Z3 M; Mitzi Magna(mobile office)

 Now i know Ecu faulty 100%
Located can wires white/blue then connected to diagnostic tool straight beside Ecu connector ,so i can communicate with all modules except engine control module, so it means no communication ecu canbus,and i 100% sure if you unplug ecu in any driving vehicle ,you will not be able turn engine with starter because signal from ignition lock goes to ecu and then ecu sending signal to starter relay.
  • 2013 hyundai i30 1.4 GD

  • *
  • Posts: 1,817
  • au Australia
    Samford Valley
Now i know Ecu faulty 100%
Located can wires white/blue then connected to diagnostic tool straight beside Ecu connector ,so i can communicate with all modules except engine control module, so it means no communication ecu canbus,and i 100% sure if you unplug ecu in any driving vehicle ,you will not be able turn engine with starter because signal from ignition lock goes to ecu and then ecu sending signal to starter relay.

"ignition lock goes to ecu and then ecu sending signal to starter relay"
Signal goes from antenna coil (at lock) to the immobiliser which then signals ECU to open engine management.
Given your above assertion, what is clicking?
  • Every FD model; BMW Z3 M; Mitzi Magna(mobile office)

  • *
  • Posts: 1,817
  • au Australia
    Samford Valley
Been thinking about your ECU.
You may have a faulty unit but that is rare.
The ECU and engine management " module' are the same unit. The immobiliser and ECU communicate with each other. If key code is correct engine management will function and also starter relay becomes hot.
But engine will not function if the transmission is not in N or D. Worth checking the switch/wires for continuity.
2 other points. You are getting codes, the ECU is reading and displaying them.
Taking the ECU out of the car will stop it functioning. But in doing so you not only remove part of the com system , you remove the switched ground for the start relay.
  • Every FD model; BMW Z3 M; Mitzi Magna(mobile office)

  • *
  • Posts: 1,817
  • au Australia
    Samford Valley
Hi @tomtech auto ,

Interested to know what you have found or have you cured fault.  :) G
  • Every FD model; BMW Z3 M; Mitzi Magna(mobile office)