1) Turn the ignition switch to OFF.
2) Disconnect the connector from fuel injector on faulty cylinders.
3) Measure the resistance between fuel injector terminals.
Terminals
No. 1 — No. 2:
Is the resistance 0.2 — 1 Ω?
Even if DTC is detected, the circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again.
NOTE:
In this case, temporary poor contact of connector may be the cause.
Replace the faulty fuel injector.