Code 18, Injector Circuit: Notes

Injectors are provided voltage when ignition is on. PCM energizes injectors by providing an individual ground for each injector. Injectors are energized on the intake stroke of each cylinder. PCM continuously monitors voltage on each driver circuit. When PCM detects a voltage that is out of range, Code 18 will set.

1. Injector fuses are located in the underhood electrical center.
2. Performing an injector balance test will determine which injector circuit is faulty. See SYSTEM/COMPONENT TESTS - 5.7L article in this section.
3. See mini-schematic to determine which fuse powers injector banks.
4. When checking injector resistance, injector should be cold.