SEAT Workshop Service and Repair Manuals

Check Knock sensor I -G61-

Special tools and workshop equipment required

t	Manual multimeter -VAG 1526C- or digital multimeter -VAG 1715-

t	Auxiliary cable kit -VAG 1594C-

t	Adapter cable -VAG 1598/31-

t	Current flow diagrams, electrical fault finding and fitting locations

t  Adapter cable -VAG 1598/22-   Note t  It is extremely important to keep to the tightening torque of 20 Nm to ensure the knock sensors -G61- perform perfectly. t  Only gold-plated contacts may be used when servicing the knock sensor I -G61-connector contacts Test condition –  Knock sensor I -G61- fault recognised by self-diagnosis → Chapter.

Checking sequence

–  Remove from the Knock sensor I -G61--arrow- the 2-pin connector. Engine code letters: BXV - BBM –  Connect the engine tester -VAG 1598/22- to the control unit cable harness.

Engine code letters: AZQ - BME

–  Connect the engine tester -VAG 1598/31- to the control unit cable harness. Without connecting the engine control unit.

All other vehicles continued

–  Check wiring between the adapter cable -VAG 1598/31- or adapter cable -VAG 1598/22- and 2-pin connector for open circuit according to current flow diagram:

Connection	Female socket VAG 1598/31	Female socket VAG 1598/22
1	109	77
2	101	63
Wire resistance: 1.5 Ω max.

–  Additionally check wires for short to one another. t  Specification: ∞ Ω. If no wiring fault is detected: –  Loosen the knock sensor I -G61- and tighten again to 20 Nm. –  Take vehicle for a test drive. Observe the necessary safety precautions when carrying out a road test → Chapter –  During the road test the following operating conditions must be fulfilled: l  The coolant temperature must be more than 80 ℃. l  When the temperature is reached, operating conditions - Idling, Part throttle, Full throttle and Overrun must be attained several times. l  At full throttle, revs must exceed 3500 rpm. –  Again interrogate the control unit fault memory. → Chapter If the fault continues: –  Replace the Knock sensor I -G61- → Item.