Test TC-21A - Injector Control Circuits

NOTE: For connector terminal identification, refer to CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.

Start engine and allow to idle for at least 20 seconds. Shut engine off. Turn ignition on. DO NOT restart engine. Go to next step.

Using scan tool, read DTCs. If scan tool displays INJECTOR CONTROL CIRCUIT with a start run count of zero, perform appropriate test. See INJECTOR CONTROL CIRCUIT TESTS table. If scan tool does not display INJECTOR CONTROL CIRCUIT with a start run count of zero, go to next step.

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
INJECTOR #5 CONTROL CIRCUIT	TEST TC-69A
INJECTOR #6 CONTROL CIRCUIT	TEST TC-70A

Condition required to set DTC is not present at this time. INJECTOR CONTROL CIRCUIT DTC is set if no inductive activation is sensed by Powertrain Control Module (PCM) after injector turns off, and with no other injectors on. Possible causes are: open or shorted injector wiring, defective Auto Shutdown (ASD) relay wiring circuit to injector, defective connections, open injector or defective PCM. Go to next step.
Check for defective wiring and connections at injectors, ASD relay and PCM. Repair wiring and connectors as necessary and perform TEST VER-2A. If wiring and connectors are okay, go to next step.
Start engine. Wiggle wiring harness from injectors to PCM. If engine misfires or stalls, repair wiring harness as necessary and perform TEST VER-2A. If engine does not misfire or stall, see INACTIVE DTC CONDITION . Test is complete. Perform TEST VER-2A.