The Irizar i4 Hybrid is an intercity coach that combines a Cummins CM2350 diesel engine with hybrid technology for improved energy efficiency. Like all modern vehicles, it is equipped with an SCR after-treatment system using AdBlue (DEF) to reduce pollutant emissions.
A common issue in these models involves the CB20 sensor in the AdBlue tank, which monitors fluid level and temperature. A failure of this sensor can cause multiple malfunctions and affect vehicle performance.
With Jaltest INFO Web-pack CV, technicians can quickly diagnose the issue and apply the appropriate solution.
Fault Code Identification and Symptoms
When the CB20 sensor malfunctions, several fault codes may appear in the engine management system.
🔹 Common fault code: SPN 1761 – FMI 3
➡ Issue with the AdBlue level and temperature sensor signal (CB20).
🔹 Observed symptoms:
✔ Check the engine light illuminated on the dashboard.
✔ Incorrect display or missing information on AdBlue level.
✔ Limp mode activation, leading to reduced power.
✔ Risk of non-compliance with emission regulations, potentially immobilizing the vehicle.
Diagnosis and Solution with Jaltest INFO Web
1️ Step 1: Reading and Interpreting the Fault Code
With Jaltest INFO Web, the technician can:
✅ Read the SPN 1761 – FMI 3 code and get a detailed explanation of the issue.
✅ Locate the CB20 sensor precisely in the bus.
✅ Analyze potential causes of the malfunction.
2️⃣ Step 2: Real-Time Value Verification
Jaltest INFO Web provides accurate data to check the CB20 sensor:
🔹 Power supply voltage (should be between 0.5V and 4.5V).
🔹 Sensor resistance (helps detect an open circuit or short circuit).
🔹 AdBlue temperature and level values to compare with nominal specifications.
3️⃣ Step 3: Electrical Harness Inspection
🔹 Check the sensor connections for corrosion or damaged wires.
🔹 Measure the power supply voltage to ensure the sensor receives the required 12V.
🔹 Test the wire continuity between the sensor and the engine ECU.
✅ If a fault is identified in the wiring, it must be repaired or replaced.
4️⃣ Step 4: Replacing the CB20 Sensor if Necessary
If the sensor does not transmit the correct values despite a functional wiring harness, replacement is required.
✔ Remove the old sensor by following the precise instructions in Jaltest INFO Web.
✔ Install the new sensor as guided by the tool.
Why Use Jaltest INFO Web for This Type of Fault?
- Quick access to fault codes and their interpretations.
- Detailed electrical circuit diagrams to assist with inspections.
- Step-by-step testing and repair procedures for significant time savings.
- Proven solutions to support technicians and minimize vehicle downtime.
With Jaltest INFO Web, diagnosing and repairing faults on an Irizar i4 Hybrid becomes simpler and more efficient, ensuring a quick return to service without unnecessary costs. 🚍🔧
👉 Test Jaltest INFO Web for free for 7 days!
