P1289

Code

DS P — Powertrain

Injector 1 control malfunction

Brand: DS

Type: P — Powertrain

Views: UK: 0 EN: 3 RU: 1

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Page language: EN

Read and record stored DTCs and freeze-frame data with a scan tool
Verify battery voltage and charging system health before testing
Visually inspect injector 1 connector, wiring harness and engine grounds for damage, corrosion or loose connectors
Check for related DTCs (other injector or power/ground faults)
Back-probe injector connector with a noid light to confirm injector pulse when cranking/running
Measure injector coil resistance with multimeter and compare to manufacturer spec

Injector coil resistance: must match manufacturer specification (typical modern injectors ~1–16 Ω depending on type) — measure cold with wiring disconnected
Injector supply: stable battery voltage present at injector power feed (typically battery voltage with ignition on)
Injector driver output: pulsed switching (either pulsed ground or pulsed positive) from ECM when cranking/running — pulse width varies with load and RPM
Pulse width: typically milliseconds (varies by engine load and speed) — compare against live data or known-good waveform
Waveform shape: clean, regular pulses; watch for clipped/erratic pulses, constant short to ground/voltage, or missing pulses
Current draw: injector peak current is multiple amps for low-impedance designs; expect significant current when energized (use appropriate tools)

Connect a scan tool, read P1289 and any related codes, review freeze-frame and live data for cylinder 1 injection events
Visually inspect injector 1 connector, wiring harness and engine/ECM ground points; repair any damage, corrosion or loose terminals
Verify injector power supply: with ignition ON, check for battery voltage at the injector power terminal and check related fuses/relays
Back-probe injector connector with a noid light or scope while cranking/running to confirm the ECM is commanding the injector
Measure injector 1 coil resistance with the connector disconnected; compare to manufacturer spec. If open or shorted, replace injector
If injector resistance is within spec but no command at connector, check continuity between ECM pin and injector connector for opens/shorts to ground or battery
Use an oscilloscope at the injector connector to compare waveform to a known-good channel; look for missing pulses, clipped signals or noise
Swap injector 1 with another cylinder’s injector (and clear codes) to determine if fault follows the injector or remains on cylinder 1 — only do if safe and practical
If wiring and injector are good and the ECM does not command correctly, inspect ECM grounds and power supply. If wiring and grounds are good, consider ECM injector driver failure and consult manufacturer repair procedures before replacing ECM
After repairs, clear codes and perform test drive; monitor for reoccurrence and verify proper operation

⚠️ Status

Injector 1 control circuit malfunction detected by ECM — electrical fault in injector control circuit.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours

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P1289 — Injector 1 control malfunction