Fuel Injector: Testing and Inspection
CHECKING RESISTANCE AND VOLTAGE SUPPLY- Remove upper part of intake manifold. Service and Repair
- Disconnect 2-pin connector from each Fuel Injector.
- Check resistance of each Fuel Injector individually at terminal -2- using multimeter (Fluke 83 or equivalent) and cables from VAG 1594 adapter kit.
^ Specification: 15 - 21.5 Ohms
- If resistance is NOT OK, replace malfunctioning Fuel Injector.
- If resistance is OK, disconnect 5-pin connector from Ignition Coil (N152).
- Check voltage supply for all Fuel Injectors. Connect VAG 1527B voltage tester to connector -1- using cables from VAG 1594 adapter kit.
- Operate Starter.
NOTE: LED must flicker.
- If LED does NOT flicker:
- Switch ignition OFF.
- Reconnect connectors to Fuel Injectors.
- Carry out electrical testing: test steps 12-17
- If necessary, replace Motronic Engine Control Module (ECM) (J220).
CHECKING SPRAY PATTERN AND LEAKAGE
- Disconnect harness connector from Ignition Coil (N152).
- Remove fuel rail complete with Fuel Injectors.
- Extend fuel supply and fuel return lines using extension hoses if necessary.
- Place Fuel Injectors in VAG 1602 measuring tool.
- Reconnect harness connectors to all Fuel Injectors.
- Disconnect blue 2-pin connector from Engine Coolant Temperature (ECT) Sensor (G62).
- Set VAG 1630 digital potentiometer (side A) to 15 kOhms and connect to disconnected harness connector using cables from VAG 1594 adapter kit.
- Operate starter.
NOTE: Fuel Injectors must spray uniformly.
- Switch ignition OFF and check Fuel Injectors for leaks.
NOTE:
- Maximum allowable leakage: 2 drops/min. from each Fuel Injector.
- When installing fuel injectors, make sure that the 0-rings are not or will not be damaged. To make installation easier, lightly moisten the 0-rings with oil
- Check and erase Diagnostic Trouble Code (DTC) Memory and correct malfunctions as necessary.
NOTE: The stored malfunction "Engine Coolant Temperature Sensor-G62" caused by the test will be erased.