SEAT Workshop Service and Repair Manuals

Checking charge air pressure sender -G31-

Special tools and workshop equipment required

t	Hand multimeter -V.A.G 1526 A- or hand multimeter -V.A.G 1526C-

t	Auxiliary measuring set -V.A.G 1594 A- or auxiliary measuring set -V.A.G 1594C-

t	Adapter cable, 121-pin -V.A.G 1598/31-

Not illustrated t  Current flow diagram Test prerequisites l  Self-diagnosis has detected a fault in the charge air pressure sender → Rep. Gr.01. l  Ignition switched off Checking voltage supply and wiring to control unit

–  Pull 4-pin connector from charge air pressure sender -G31--arrow-.

–  Connect multimeter for voltage measurement to contacts 1 (earth) and 3 (positive) of charge air pressure sender -G31- connector using auxiliary cables from auxiliary measuring set -V.A.G 1594 A- or auxiliary measuring set -V.A.G 1594C-. –  Switch on ignition. Specification: at least 4.5 V –  Switch off ignition. If no voltage is present: –  First check whether a coded radio is fitted. If so, obtain anti-theft coding. –  Remove battery.

–  Connect adapter cable, 121-pin -V.A.G 1598/31- to control unit wiring harness. The engine control unit remains disconnected.

–  Check cables between test box and 4-pin connector for open circuit according to current flow diagram. Contact 1 and test box socket 108 Contact 3 and test box socket 98 Contact 4 and test box socket 101 Cable resistance: max. 1.5 Ω. –  Also check wiring for short to one another, short to vehicle earth and short to battery positive. Specification: ∞ Ω. If no cable fault is detected and voltage is present between contacts 1 + 3: –  Check function → Anchor. If no cable fault is detected and no voltage is present between contacts 1 + 3: –  Renew engine control unit → Rep. Gr.24. Checking function –  Connect adapter cable, 121-pin -V.A.G 1598/31- to engine control unit wiring harness and engine control unit. –  Connect battery.

–  Reconnect 4-pin connector to charge air pressure sender -G31--arrow-. –  Connect multimeter for voltage measurement to sockets 101 (positive) and 108 (earth) using auxiliary cables from auxiliary measuring set -V.A.G 1594 A- or auxiliary measuring set -V.A.G 1594C-. –  Start engine and measure voltage. Specification: 1.80..2.00 V –  Start engine and increase to maximum rpm by flooring throttle. Specification: 2.00..3.00 V If the specifications are not attained: –  Renew charge air pressure sender -G31- → Item. –  Interrogate and clear fault memory → Rep. Gr.01