Volkswagen Workshop Service and Repair Manuals

Servicing ignition part:

=> Repair group 28

Notes:

• ◆ Fuel hoses in engine compartment must only be secured with spring type clips. The use of clamp or screw type clips is not permissible.
• ◆ The control unit for the fuel injection and ignition system is equipped with a fault memory. Before carrying out repairs, adjustment work and fault finding, the fault memory must be interrogated and the vacuum connections checked (outside air).
• ◆ Components marked * are checked via the self diagnosis.
  , interrogating fault memory.
• ◆ Components marked with ** are checked via the final control diagnosis .
• ◆ For trouble-free operation of the electrical components, a voltage of a least 11.5 V is necessary.

• ◆ If the engine parts, runs for a short period and then stop, after fault finding, repairs or component tests, then the fault may lie with the immobilizer which is blocking the engine control unit.
  The fault memory must be interrogated and if necessary the control unit matched .
• ◆ During some checks it is possible that the control unit will recognize and store a fault therefore after completing all checks and repairs interrogate fault. memory and if necessary erase , interrogating fault memory.

Safety precautions .

Rules for cleanliness .

Technical data .

Checking engine operating modes

• Air cleaner
• ◆ Dismantling and assembling
  
• Connector
• ◆ Only disconnect or connect with ignition switched off
• ◆ Unlatch to disconnect
• Motronic control unit (J220)
• ◆ Location: in plenum chamber
• ◆ For injection system, throttle valve control part, knock control, speed goveming via injectors or fuel pump relay, ignition and self diagnosis
• ◆ Voltage supply via voltage supply relay (J220) and terminal 15
• ◆ Checking voltage supply
  => Page 24-49
• Securing plate
• ◆ For Motronic control unit (J220)
• 10 Nm

• Intake hose
• Connector
• ◆ 8 pin
• ◆ For throttle valve control part (J338)
• 20 Nm
• Support
• ◆ Between intake manifold and valve cover
• Intake manifold
• ◆ Dismantling and assembling
  => Page 24-8
• Connector
• ◆ 2 pin
• ◆ For injector
• Not applicable
• 25 Nm
• Gasket
• ◆ Renew

• Connector
• ◆ 4 pin
• ◆ Wiring chamber 1 and wiring chamber 3 for (G62)
• Coolant temperature sender (G62)*
• ◆ Black with temperature gauge sender (G2)
• ◆ For Motronic control unit
• ◆ Checking => Page 24-35
• ◆ If necessary before removing, release pressure from cooling system
• O ring
• ◆ Renew if damaged
• Retaining clip
• To tappet cover
• To crankcase
• Retaining ring