CHECK POWER SUPPLY LINE.

1) Turn the ignition switch to ON.

2) Measure the voltage between fuel injector and engine ground on faulty cylinders.

Connector & terminal

Euro 4 model

#1 (E5) No. 2 (+) — Engine ground (−):
#2 (E16) No. 2 (+) — Engine ground (−):
#3 (E6) No. 2 (+) — Engine ground (−):
#4 (E17) No. 2 (+) — Engine ground (−):

Euro 5 model

#1 (E5) No. 1 (+) — Engine ground (−):
#2 (E16) No. 1 (+) — Engine ground (−):
#3 (E6) No. 1 (+) — Engine ground (−):
#4 (E17) No. 1 (+) — Engine ground (−):

QUESTION

Is the voltage 10 V or more?

Yes No

Repair the poor contact of all connectors in fuel injector circuit.

Repair the harness and connector.

NOTE:

In this case, repair the following item:

• Open circuit in harness between the main relay and fuel injector connector on faulty cylinders

• Poor contact of main relay connector

• Poor contact of fuel injector connector on faulty cylinders

• Poor contact of coupling connector