SEAT Workshop Service and Repair Manuals

Ignition coils: verification

Special tools and workshop equipment required

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

t	Pressure tester -VAG 1527B-

t	Auxiliary cable kit -VAG 1594C-

t	Adapter cable -VAG 1598/31-

t  Adapter cable -VAG 1598/22- t  Current flow diagrams, electrical fault finding and fitting locations Test prerequisites l  The fuses must be OK. l  Battery voltage 11.5 V l  Hall sender -G40-, correct; check → Chapter. l  Engine speed sender -G28-, correct; check → Chapter. Checking sequence   Note Ignition coils and their respective output stages are one unit.

–  Remove the ignition coil connector to be tested -arrows-.

checking voltage supply.

–  With the manual multimeter -VAG 1526C- and the auxiliary cables from the auxiliary cable kit -VAG 1594C-, measure the power supply in the removed connector between:

Connection	Connection
2	3
Switch on ignition. Specification: min. 11.5 V

–  Switch ignition OFF. If no voltage is present:

–  Check, using circuit diagram, for open cable circuit between:

4-pin connector, contact
3	Relay carrier
Wire resistance: max. 1.5 Ω

–  Check for open circuit between:

4-pin connector, contact	Connection
2	Earth
Wire resistance: max. 1.5 Ω

If the power supply is found to be correct, check activation → Anchor Checking actuation   WARNING During the next test, the ignition transformer connectors or the test cables should not be touched.

–  Remove fuse No. 25 from the fuse holder.   Note Removing fuse 25 interrupts the voltage supply to the injectors.

–  With the auxiliary cables from the auxiliary cable kit -VAG 1527B-, connect the voltage tester -VAG 1594C-, to contacts 1 + 4 (ignition output 1) and contacts 4 +2 (ignition output 2) of the removed connector. –  Operate starter and check the ignition signal from engine control unit. LED lamp must flash. –  Repeat test to connectors on the remainder of the cylinders. –  Switch ignition OFF. If the LED flickers and there is voltage between contacts 2 + 3: –  Replace corresponding ignition coil with output stage → Item. If the LED lamp does not flash: –  Checking wiring → Anchor. Wiring checking 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 4-pin connector for open circuit according to current flow diagram:

Cylinder/Contact	Female socket VAG 1598/31	Female socket VAG 1598/22
Cylinder 1, contact 4	112	57
Cylinder 2, contact 4	113	71
Cylinder 3, contact 4	100	76
Wire resistance: 1.5 Ω max.

–  Additionally check wires for short to one another. t  Specification: ∞ Ω. If no wiring fault is detected and voltage was present between contacts 2 + 3: –  Replace the engine control unit → Chapter.