Code
DTCC10000
DACIA
D
Injection multiplex signal missing
AI status
Completed
Completed
100%
Causes
- Loss of power or ground to injection control module or injector drivers
- Open, shorted or corroded wiring/connectors in injection harness
- Blown fuse or faulty relay supplying the injection system
- Injection control module (ECU or dedicated injector module) failure
- Communication bus (CAN) fault or loss of messages
- Software/firmware error or incorrect calibration
Symptoms
- Engine cranks but does not start or runs very poorly
- Multiple injector-related fault codes or communication errors
- Misfires, rough idle or severe loss of power
- No injector activation on cranking when monitored with scope or noid light
- Warning lamp on dash (engine management/stop-start fault)
What to check
- Read all stored and pending DTCs and freeze-frame data from all modules
- Verify battery voltage (should be ~12–14 V) and test during cranking
- Inspect fuses and relays related to fuel injection and ECU power
- Visually inspect injector harness, connectors and ECU connector for corrosion, damage or pushed-out pins
- Check engine and chassis ground connections for tightness and corrosion
- Monitor CAN bus for communication errors and verify physical layer (wiring, terminations)
Signal parameters
- Injector supply: battery voltage (~11–14 V) present at injector supply rail with ignition ON
- Injector driver output: pulsed low-side switching (0 V to near battery) when commanded — pulse width varies with engine load
- Reference/sensor supply: stable 5 V reference where applicable
- CAN bus electrical idle levels and messages present (check module IDs and bus bitrate in wiring diagram)
- Noid/oscilloscope waveform: detectable pulse on each injector during cranking or running conditions
Diagnostic algorithm
- Connect a full-function scan tool. Record all related fault codes and module communication status. Note freeze-frame conditions.
- Verify basic power: check battery voltage, main injection/ECU fuses and ignition supply relays. Replace any blown fuses and retest.
- Perform a careful visual inspection of wiring, pins and connectors from ECU to injector rail. Repair any damage, corrosion or loose pins.
- Confirm solid ground connections at engine and chassis grounds. Clean and retighten if needed.
- Check CAN bus: verify physical layer voltages and look for error counters or lost messages. Repair wiring or termination faults before replacing modules.
- At an injector connector, use a noid light or oscilloscope while cranking: verify presence/absence of injector drive pulses. Compare all injector channels.
- If no pulses but CAN and power are OK, trace continuity from ECU injector driver outputs to connector. Look for opens/shorts to power or ground.
- If wiring and supply are good but outputs remain absent, attempt swap or bench-test of known-good injection module/ECU only if service documentation allows and vehicle immobilizer/security procedures are followed.
- After any repair, clear codes and perform functional test (crank/run) and road test to confirm fault does not return.
- If intermittent or after collision, consult manufacturer wiring diagrams and consider harness replacement or module reprogramming as directed by service manual.
Likely causes
- Blown injection-system fuse or failed power/ignition relay
- Disconnected, corroded or bent pins at injectors or ECU connector
- Open/short in low-side injector driver wiring
- Faulty injector driver stage inside injection module or ECU
- Loss of CAN communication between injection module and main ECU
- Poor ground connection at engine/chassis ground point
Fault status
Status
Injection multiplex signal missing — no control/communication signal detected to injector drivers.
Repair difficulty: Medium
Diagnostic time: 1.5 - 3.5 hours
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