Pump Injector Unit, Checking
Diagnostic Procedures
Pump Injector Unit, Checking
• Cylinder bank 1 is located in direction of travel, right.
• Cylinder bank 2 is located in direction of travel, left.
• When servicing terminals on central connector for cylinder head, use only silver-plated terminals.
Special tools, testers and auxiliary items required
• Multimeter (VAG1526) or Multimeter (VAG1715)
• Connector test kit (VAG1594)
• Wiring diagram
Test Prerequisites
• Fuses in E-box (plenum chamber, left) must be OK:
• Battery voltage must be at least 11.5 volts.
• All electrical consumers such as, for example, lights and rear window defroster must be switched off.
• For vehicles with automatic transmission, selector lever must be in P.
• If vehicle is equipped with an A/C system, it must be switched off.
• Ground (GND) connections between engine and chassis must be OK.
• Central connector at cylinder heads bank 1 and bank 2 checked for damage and are OK.
• Ignition is switched off.
Cylinder bank 1: Check Valve for pump/injector, cylinder 1 (N240) to Valve for pump/injector, cylinder 5 (N244).
Cylinder bank 2: Check Valve for pump/injector, cylinder 6 (N245) to Cylinder 10 Pump/Injector (N306).
Pump/Injector Valves (N240 and N244) Test Sequence
- Remove cylinder head cover.
- Pry off connectors of all pump-injector units using a screwdriver. To prevent canting. While doing so, support opposite side of connector using light finger pressure.
- Check resistance between terminals of the corresponding Pump-Injector Unit valve.
Specified value: approx. 0.1 to 1.0 ohms
If specified value is not obtained:
- Replace malfunctioning Pump-Injector Unit.
- Erase DTC memory of Engine Control Module (ECM) --> [ Diagnostic Mode 04 - Erase DTC Memory ] Diagnostic Modes 01 - 09.
- Generate readiness code --> [ Readiness Code ] Monitors, Trips, Drive Cycles and Readiness Codes.
If specified value is obtained:
- Check Control Module Wires.
Control Module Wires, Checking
- Connect test box ((VAG1598/42)) to Engine Control Module (ECM) (J623) wiring harness using adapter cable ((VAG1598/39-1)) , connecting test box for wiring test.
- Check wires between test box and 2-pin connector for open circuit according to wiring diagram:
Cyl. 1: Terminal 2 + socket 46
Cyl. 2: Terminal 2 + socket 48
Cyl. 3: Terminal 2 + socket 1
Cyl. 4: Terminal 2 + socket 2
Cyl. 5: Terminal 2 + socket 47
Wire resistance: max. 1.5ohms
- Check wires between all 2-pin connectors (terminal 1) and test box for open circuit according to wiring diagram.
Terminal 1 + socket 31
Terminal 1 + socket 32
Wire resistance: max. 1.5 ohms
- Also check wires for short circuit to each other, to vehicle Ground (GND) and to B+.
Specified value: infinite ohms
If no malfunctions are found in wires:
- Replace Engine Control Module (ECM) (J623) --> [ Engine Control Modules, Replacing ] Engine Control Modules, Replacing.
Pump/Injector Valves (N245 and N306) Test Sequence
- Remove cylinder head cover.
- Pry off connectors of all pump-injector units using a screwdriver. To prevent canting. While doing so, support opposite side of connector using light finger pressure.
- Check resistance between terminals of the corresponding Pump-Injector Unit valve.
Specified value: approx. 0.1 to 1.0 ohms
If specified value is not obtained:
- Replace malfunctioning Pump-Injector Unit , removing and installing Pump-Injector Unit.
- Erase DTC memory of Engine Control Module (ECM) --> [ Diagnostic Mode 04 - Erase DTC Memory ] Diagnostic Modes 01 - 09.
- Generate readiness code --> [ Readiness Code ] Monitors, Trips, Drive Cycles and Readiness Codes.
If specified value is obtained:
- Check Control Module Wires
Control Module Wires, Checking
- Connect test box ((VAG1598/42)) to Engine Control Module 2 (J624) wiring harness using adapter cable ((VAG1598/39-1)) , connecting test box for wiring test.
- Check wires between test box and 2-pin connector for open circuit according to wiring diagram:
Cyl. 6: Terminal 2+socket 46
Cyl. 7: Terminal 2+socket 48
Cyl. 8: Terminal 2+socket 1
Cyl. 9: Terminal 2+socket 2
Cyl. 10: Terminal 2+socket 47
Wire resistance: max. 1.5 ohms
- Check wires between all 2-pin connectors (terminal 1) and test box for open circuit according to wiring diagram.
Terminal 1+socket 31
Terminal 1+socket 32
Wire resistance: max. 1.5 ohms
- Also check wires for short circuit to each other, to vehicle Ground (GND) and to B+.
Specified value: infinite ohms
If no malfunctions are found in wires:
- Replace Engine Control Module 2 (J624).