Test TC-21A - Injector Control Circuit

WARNING: This page is about a different variant/trim than selected.

NOTE: For connector terminal ID, see CONNECTOR IDENTIFICATION DIRECTORY . For wiring diagram, see WIRING DIAGRAMS - 2.4L article.

Start engine and allow to idle for at least 20 seconds. Shut engine off. Turn ignition on. DO NOT start engine.
Using scan tool, read DTC message. If scan tool displays INJECTOR CONTROL CIRCUIT with a start run count of zero, go to step 7). If scan tool does not display INJECTOR CONTROL CIRCUIT with a start run count of zero, go to next step.
Conditions required to set DTC are not present at this time. DTC may be stored in Powertrain Control Module (PCM) if no inductive activation is sensed after injector turns off, and with no other injectors on. Possible causes are: open or shorted injector driver circuit, open circuit in injector, open Auto Shutdown (ASD) relay supply circuit at injector, defective PCM, defective connector terminals or wiring. Go to next step.
Check for defective wiring or connections at injectors, ASD relay and PCM. The ASD relay is located in power distribution center at driver's side front corner of engine compartment, near battery. The PCM is located between driver's side front fender and power distribution center, near battery.
If defective wiring or connections exist, repair as necessary. Perform TEST VER-2A. If no possible causes are found, go to next step.
Start engine. Wiggle wiring harness from injectors to PCM. If engine misfires or stalls, repair wiring harness as necessary. Perform TEST VER-2A. If engine does not misfire or stall, see INACTIVE TROUBLE CODE CONDITION .
Perform correct test by noting scan tool display. See INJECTOR CONTROL CIRCUIT TESTS table.

INJECTOR CONTROL CIRCUIT TESTS

Scan Tool Display	Test
INJECTOR #1 CONTROL CIRCUIT	TEST TC-21B
INJECTOR #2 CONTROL CIRCUIT	TEST TC-20A
INJECTOR #3 CONTROL CIRCUIT	TEST TC-19A
INJECTOR #4 CONTROL CIRCUIT	TEST TC-61A