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The following test steps must be performed in the given order. If a fault is found in one test step, the subsequent test steps can be skipped.
Important:
The fuel system is very sensitive. Work should be done with high cleanliness and care. Air in the fuel system can cause damage to the high-pressure fuel pump. That's why the vehicle must never be driven till the fuel tank is empty.
Function Checks
- Check fuel tank for correct fuel sort content
- The fuel reserve must be greater than 5 L
- Check the concerned system for leaks
- Check connected hoses and tubes for kinks, damage etc.
- Point of breaks / scuff marks at the fuel or injection lines
- Check for pressure decrease in the high pressure section.
(leakage, blockage)
- Check the correct fitting of the connections and sealing.
(use only sealing, that is approved by the vehicle manufacturer)
Perform a visual check of the following components:
- High-pressure fuel pump
- Common Rail
- B176 Sensor - Rail Fuel Pressure
- Y154 Solenoid Valve - Fuel Pressure Regulation
- Y161 Solenoid Valve - Fuel Metering
- L2A Injection Valve - Cylinder 1
- L2B Injection Valve - Cylinder 2
- L2C Injection Valve - Cylinder 3
- L2D Injection Valve - Cylinder 4
Refer to Service Manual Document Number 01401850
Select the following Functional System:
Electronic Diesel Injection System EDC 16C9/16C39, Z 19 DT, Z 19 DTH, Z 19 DTL
Verify programming of the system:
The Quantity Adjustment Code, which is written on every injector, must be programmed in the engine control unit.
After programming successfully, check if the system malfunction is still present.
- Verify mechanical system functions/components
Check injector
Function Checks
Perform the following troubleshooting:
After successful test/fault repair proceed to the next test step
Note:
Observe the corresponding safety measures before opening the high pressure fuel system.
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