Volkswagen Workshop Service and Repair Manuals

Engine code 1Y

Notes:

• ◆ The activation of the exhaust gas recirculation system is undertaken by automatic glow period control unit (J179) via exhaust gas recirculation 2-way valve (N161 or N18) to exhaust gas recirculation valve.
• ◆ The exhaust gas recirculation is switched off above approx. 1000 m by the altitude correction switch in the automatic glow period control unit.
• ◆ The engine speed cut-out is via the automatic glow period automatic control unit (J179). The exhaust gas recirculation is switched on at engine speeds over 800 rpm and is switched off at engine speeds over 3200 rpm.
• ◆ During acceleration the exhaust gas recirculation is switched off for 2 seconds.
• ◆ Renew self-locking nuts.

Engine code AEY

Notes:

• ◆ The control of the exhaust gas recirculation system is undertaken by diesel direct injection system control unit (J248) via EGR valve (N18) (electric) to exhaust gas recirculation valve (mechanical).

• ◆ Checking exhaust gas recirculation valve (N18).

=> Repair group 01; Final control diagnosis; Performing final control diagnosis

• ◆ The cone-shaped plunger in the mechanical exhaust gas recirculation valve ensures that various cross sectional openings are possible at different plunger lifts.
• ◆ Pulsed control makes every conceivable valve position possible.
• ◆ Renew self-locking nuts.