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Home >> GMC >> 1991 >> Value Van 7.4 N >> Repair and Diagnosis >> External Pages >> Different car >> Section 35 (Engine Controls - Tests W/Codes - 3.9L) >> Self-Diagnostic Tests >> Test TC-24A - Injector Control Circuits (DTC 27)

Test TC-24A - Injector Control Circuits (DTC 27)

WARNING: This page is about a different car, the 1995 Dodge Ram Wagon, 1995 Dodge Ram Van, 1995 Dodge Pickup, 1995 Dodge Dakota, and 1995 Dodge Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS  section at the end of this article.
  1. Using scan tool, erase trouble codes. Attempt to start engine. If engine will not start, crank engine for at least 10 seconds.
  2. Using scan tool, read trouble codes. If engine starts, allow engine to idle for at least 20 seconds. If scan tool does not display INJECTOR CONTROL CIRCUIT, condition required to set trouble code is not present at this time. Go to next step. If scan tool displays INJECTOR CONTROL CIRCUIT, go to appropriate test. See INJECTOR TROUBLE CODES table.
    INJECTOR TROUBLE CODES

    Trouble Code Go To
    INJECTOR #1 CONTROL CIRCUIT TC-24B 
    INJECTOR #2 CONTROL CIRCUIT TC-25A 
    INJECTOR #3 CONTROL CIRCUIT TC-26A 
    INJECTOR #4 CONTROL CIRCUIT TC-27A 
    INJECTOR #5 CONTROL CIRCUIT TC-28A 
    INJECTOR #6 CONTROL CIRCUIT TC-29A 
    INJECTOR #7 CONTROL CIRCUIT TC-30A 
    INJECTOR #8 CONTROL CIRCUIT TC-31A 
  3. INJECTOR CONTROL CIRCUIT trouble code sets if Powertrain Control Module (PCM) does not detect an inductive kick .18ms after injector turn-off with no other injectors on. Battery voltage must be more than 12 volts, ASD relay energized, injector pulse width less than 10ms with engine speed less than 3000 RPM. Possible causes are: open or shorted injector control circuit, open injector power supply circuit, open injector or failed PCM. Go to next step.
  4. Inspect all related wiring and connectors. Repair as necessary. Perform TEST VER-2. If no problems are found with wiring and connectors, go to next step.
  5. Start engine. Wiggle wiring harness from injectors to PCM. If engine misfires or stalls, repair wiring harness as necessary. Perform TEST VER-2. If engine does not misfire or stall, see INACTIVE TROUBLE CODE CONDITION . Perform TEST VER-2.
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