Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Test TC-40A - Injector #4 Control Circuit (DTC 27)
1994 Plymouth Voyager LE, 3.3 RSECTION Test TC-40A - Injector #4 Control Circuit (DTC 27)
- Turn ignition off. Disconnect injector No. 4 connector. Using an external ohmmeter, check resistance between injector terminals. If resistance is not 3.5-5.5 ohms, replace injector. Perform TEST VER-2 . If resistance is 3.5-5.5 ohms, turn ignition on.
- Using DRB, actuate injector No. 4. Using DRB in voltmeter mode, check voltage on injector No. 4 connector, Auto Shutdown (ASD) output circuit (Dark Green/Orange wire). If voltage is less than 10 volts, repair open Dark Green/Orange wire. Perform TEST VER-2. If voltage is more than 10 volts, turn ignition off.
- Disconnect Powertrain Control Module (PCM) connector. Using an external ohmmeter, check resistance of injector No. 4 driver circuit (White/Light Blue wire) between injector connector (harness side) and PCM connector terminal No. 13. If resistance is more than 5 ohms, repair open White/Light Blue wire. Perform TEST VER-2.
- If resistance is less than 5 ohms, using DRB in ohmmeter mode, check resistance of PCM terminal No. 13 (White/Light Blue wire). If resistance is less than 5 ohms, repair short to ground in White/Light Blue wire. Perform TEST VER-2 . If resistance is more than 5 ohms, replace PCM. Perform TEST VER-2.
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.