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BMW Injector Short-to-B+ Diagnosis & Repair Guide | Electronic Repair Egypt
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Here’s a detailed, step-by-step guide from an expert perspective, focusing on both technical accuracy and practical workflow.
Common DTCs associated with this issue:
- 112404 – Injector Cylinder 4, activation: Short to B+
- 112104 – Injector Cylinder 1, activation: Short to B+
Step 1: Safety FirstBefore touching injectors or the DME:
- Disconnect the battery negative terminal.
- Work on a cold engine.
- Use a multimeter for safe measurement.
Step 2: Inspect Wiring and ConnectorsStart with the obvious: visual inspection.
- Check harness insulation for chafing, melted sections, or pin corrosion.
- Focus on cylinders 1 and 4.
- Damaged wiring is the most common culprit for Short-to-B+ faults.
Step 3: Test Injector Coils
- Disconnect the injectors from the DME.
- Measure resistance across each injector:
- Typical petrol injector: 12–16 Ω
- 0 Ω → shorted coil → replace the injector
- Open circuit → injector broken internally
Step 4: Check Wiring from DME to Injectors
- With injectors disconnected:
- Test for continuity from DME output pin to +12V → should be open.
- Continuity indicates wiring short to battery → trace and repair.
- Also check for shorts to ground.
Step 5: Diagnose DME Output DriverIf injectors and wiring are confirmed good:
- Measure DME output pins using a resistive dummy load (never direct 12V).
- Normal operation: pulsed signal to the low-side switch.
- If output is stuck at 12V → DME driver MOSFET blown → DME repair or replacement required.
Step 6: Clear DTCs and Test
After repairing or replacing faulty components:
- Clear DTCs using ISTA/D .
- Test engine start and idle.
- Confirm injectors fire correctly and DTCs do not return.
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BMW ECU Repair Manuals
$775.00
BMW Repair Manuals Account | Diesel & Petrol ECU Repair Library [Online Account] Get unlimited access to professional BMW repair manuals covering diesel and petrol ECUs. Learn fault diagnosis, ECU testing, wiring analysis, troubleshooting, and repair procedures with regularly updated technical guides for workshops and automotive professionals.
Cars ECU Repair Manuals Complete – Professional Online ECU Repair Manual Library
$1,260.00
Cars ECU Repair Manuals Complete Get unlimited online access to our complete ECU Repair Manuals library for cars. Includes step-by-step repair guides, real ECU fault cases, IC functions, block diagrams, pinouts, and continuous cloud updates. Covers BMW, Mercedes-Benz, VAG, Toyota, Ford, PSA, Renault, Jeep, and many more vehicle brands.
Auto ECU Circuit Diagrams
$520.00
The circuit diagram is now available for free with the 'ECU Hardware Course' Auto ECU Circuit Diagrams & Wiring Instant Download - Online Account
FADOS9F1 Repair Package
$4,350.00 $3,650.00
LIMITED TIME OFFER Package: - FADOS9F1 Tester (New Version) - ECU Hardware Repair Testing Course - ECU Repair Manuals Account - ECU Go/No Go Testing Account
FADOS7F1-18V Repair Package
$3,996.25 $2,850.00
LIMITED TIME OFFER Package: - FADOS7F1-18V(New Version) - Advanced FADOS Course Account - ECU Hardware Repair Testing Course - ECU Repair Manuals Account - ECU Go/No Go Testing Account
FADOS7F1-10V Repair Package
$2,982.00 $2,625.00
LIMITED TIME OFFER Package: - FADOS7F1-10V(New Version) - Advanced FADOS Course Account - ECU Hardware Repair Testing Course - ECU Repair Manuals Account - ECU Go/No Go Testing Account
Automotive IC Database Software – Professional ECU Component & Semiconductor Reference
$475.00 $375.00
Automotive IC Database Software – More than 350,000+ Automotive Electronic Parts Access over 350,000 automotive electronic components with complete IC specifications, ECU compatibility, SMD marking identification, pin-to-pin replacements, alternative parts, repair notes, AEC qualification, and free online updates. The ideal reference tool for automotive ECU repair technicians, engineers, and electronics professionals.
