P0200 - Fuel Injector Circuit/Open
System
Powertrain (Engine & Gearbox)
Technical Description
The control module has detected a fault in the Fuel Injector Circuit/Open (P0200). The module sees no circuit at all — broken wire, backed-out pin, or a failed sensor.
Multimeter Test Points & Nominal Values
| Test Point / Component | Measurement | Nominal Target Range | Test Condition |
|---|---|---|---|
| Fuel Injector Circuit/Open – Coil Resistance | Resistance (Ω) | 11.5 - 15.5 Ω (port) / 0.5 - 3.0 Ω (direct injection) | Connector disconnected at 20°C |
| Fuel Injector Circuit/Open – Injection Pulse at operating cycle | Signal (ms) | 2.5 - 4.5 ms idle / 1.5 - 20 ms under load | Engine running |
| Fuel Injector Circuit/Open – Supply Voltage | Voltage (V) | 11.8 - 14.4 V (port) / up to 65 - 90 V boost (direct) | Ignition ON / engine running |
Connector disconnected at 20°C
Engine running
Ignition ON / engine running
Oscilloscope Waveform Analysis
1 ms/div, 20 V/divPossible Causes
Open circuit, damaged wiring harness, or disconnected plug at Fuel Injector Circuit/Open
Chafed or pinched wiring harness along the signal path to Fuel Injector Circuit/Open
Internal mechanical wear or carbon deposits inside Fuel Injector Circuit/Open
Defective internal output driver or reference circuit in the control module for Fuel Injector Circuit/Open
Symptoms
4
Recommended Solution
Verify continuity (< 0.5 Ω) on the signal wire between the component plug and the ECM header connector.
Verify loaded supply voltage and harness terminal pins at Fuel Injector Circuit/Open.
Check circuit continuity and ground-side voltage drop (< 0.05 V) for Fuel Injector Circuit/Open.
Perform fuel rail pressure-drop / balance test to identify leaking, stuck, or clogged injectors.
Mechanic's Tip
Pair a current clamp with your voltage channel on the scope. The distinct dip in the current ramp marks the physical pintle lift — no dip means the coil is energized but the needle is mechanically seized.