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Home >> Dodge and Ram >> 1998 >> Caravan Base, 2.4 B >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - 2.4L >> DTC Test >> Test TC-21A - Injector Control Circuit
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Test TC-21A - Injector Control Circuit

NOTE: For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article.
  1. Start engine and allow engine to idle for at least 20 seconds. Shut engine off. Turn ignition on. DO NOT start engine.
  2. Using scan tool, check for stored DTCs. 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.
  3. 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.
  4. 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.
  5. If defective wiring or connections exist, repair as necessary. Perform TEST VER-2A - ROAD TEST VERIFICATION . If no possible causes are found, go to next step.
  6. Start engine. Wiggle wiring harness from injectors to PCM. If engine misfires or stalls while wiggling wiring harness, repair wiring harness as necessary. Perform TEST VER-2A - ROAD TEST VERIFICATION . If engine does not misfire or stall while wiggling wiring harness, see INACTIVE TROUBLE CODE CONDITION . Perform TEST VER-2A - ROAD TEST VERIFICATION .
  7. 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 TC-21F 
INJECTOR #2 CONTROL CIRCUIT TC-20A 
INJECTOR #3 CONTROL CIRCUIT TC-19A 
INJECTOR #4 CONTROL CIRCUIT TC-61A 
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