No spark

2004 HYUNDAI TIBURON

80,000 MILES

HEADERHWY

MEMBER
1 POST

Vehicle cranks but will not start. No spark and plugs are dry. Replaced defective crank sensor (cracked insulation and bare wires touching), replaced coils, and replaced ECM. No results. Checked all fuses for ECU, sensor and ignition. Measured power supply to coils and crank sensor. No error codes stored in original ECU. This car is the Canadian model equipped with a coded key and immobilizer anti-theft system. Could this be the source of the problem, and how could that be tested? Does the installation of another ECU (same part# as original) require reprogramming to recognize the coded ignition key?

Aug 2, 2013 at 4:55 AM

HMAC300

✓ASE Certified Mechanic
48,601 POSTS

If the security light is not flashing it sounds like you have an engine control relay that is not working.

Here is a guide to help you test the relay

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

Here is the engine relay location and fuse panel identification. Also I have included the engine wiring diagrams so you can see how the system works.

Check out the diagrams (Below)

Please let us know what you find. We are interested to see what it is.

Cheers

Images (Click to enlarge)

Professional Diagram for 2CarPros Members
Click here to log in and view diagram.

Aug 2, 2013 at 7:00 AM