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 and workshop equipment required
- Multimeter VAG1526 or Multimeter VAG1715
- Connector test kit VAG1594
- Wiring diagram
Test Prerequisites
- Fuses in E-box (plenum chamber, left) must be OK: Refer to SYSTEM WIRING DIAGRAM
- 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- DIAGNOSTIC PROCEDURES .
Cylinder bank 2: Check Valve for pump/injector, cylinder 6 -N245- to Cylinder 10 Pump/Injector -N306- DIAGNOSTIC PROCEDURES .
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 Ω
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 .
-- Generate readiness code READINESS CODE .
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. 1.5Ω
-- 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. 1.5Ω
-- Also check wires for short circuit to each other, to vehicle Ground (GND) and to B+.
Specified value: ∞ Ω
If no malfunctions are found in wires:
-- Replace Engine Control Module (ECM) -J623- 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 Ω
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 .
-- Generate readiness code READINESS CODE .
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. 1.5Ω
-- 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. 1.5Ω
-- Also check wires for short circuit to each other, to vehicle Ground (GND) and to B+.
Specified value: ∞ Ω
If no malfunctions are found in wires:
-- Replace Engine Control Module 2 -J624- ENGINE CONTROL MODULES, REPLACING .