With Manufacturer's Scan Tool
Ignition Coils With Power Output Stage, Checking
Special tools and equipment
- VAG1598/31 test box
- Multimeter (Fluke 83 or equivalent)
- VW1594 adapter set
- VAG1527B voltage tester
- Wiring diagram
Check conditions
- Fuse 29 must be OK
- Battery voltage at least 11.5 V
- Engine speed (RPM) sensor -G28- OK. Refer under "Powertrain Management/Computers and Control Systems/Engine Speed Sensor", Testing and Inspection
- Camshaft Position (CMP) sensor -G40- OK. Refer under "Powertrain Management/Computers and Control Systems/Camshaft Position Sensor", Testing and Inspection
Test sequence
- Disconnect 5-pin harness connector from ignition coil (arrow).
Checking voltage supply
- Using multimeter and adapter cables from VW1594, measure supply voltage between terminals 1 + 5 of disconnected harness connector.
- Switch ignition on.
Specified value: min. 11.5 V
- Switch ignition off.
If no voltage is present:
- Check wire between 5-pin harness connector terminal -5- and relay plate for open circuit according to wiring diagram.
Wire resistance: max. 1.5 ohms
- Check wire between 5-pin harness connector terminal -1- and Ground (GND) for open circuit according to wiring diagram.
Wire resistance: max. 1.5 ohms
If there is no malfunction in the supply voltage:
- Check activation.
Checking activation
WARNING!
During the following test do not touch the connecting parts of the ignition coils or test cables.
- Remove fuse No.32 from fuse holder.
NOTE: Removing fuse 32 interrupts the voltage supply to the fuel injectors.
- Connect VAG1527B voltage tester with adapter cables from VW1594 to
- Terminals -5- + -2- (ignition output 1), and
- Terminals -5- + -3- (ignition output 3), and
- Terminals -5- + -4- (ignition output 2) of disconnected harness connector.
- Operate starter and check ignition signal from Engine Control Module (ECM).
LED must flicker.
- Switch ignition off.
If the LED flickers and the supply voltage is OK:
- Replace ignition coil -N152-. Refer to item 7, Service and Repair
- Check DTC memory. If necessary, repair any malfunctions and erase DTC memory.
- Display readiness code.
If the DTC memory has been erased or the ECM was disconnected from permanent battery (B+) voltage, the readiness code must be generated again.
If the LED does not flicker:
- Check wiring.
Checking wiring
- Remove wiper arms and plenum chamber cover.
- Connect VAG1598/31 test box to control module wiring harness. Engine Control Module (ECM) is not connected by this action.
- Check wiring for open circuit between test box and 5-pin harness connector using to wiring diagram.
- Terminal -2- + socket 102
- Terminal -3- + socket 94
- Terminal -4- + socket 103
- Wire resistance: max. 1.5 ohms
- Also, check wires for short to one another.
Specified value: infinity ohms
If no wiring malfunction is detected and voltage was present between terminals -1- + -5-:
- Replace Engine Control Module (ECM).
Checking secondary winding
- Check secondary winding on terminal 4 between
- Cyl.1 + Cyl.6
- Cyl.3 + Cyl.4
- Cyl.2 + Cyl.5
Specified value: 3.6 - 4.4 kohms
If the specified values are not obtained:
- Replace ignition coil -N152-. Refer to item 7, Service and Repair
If the specifications are not obtained:
- Check DTC memory. If necessary, repair any malfunctions and erase DTC memory.
- Display readiness code.
If the DTC memory has been erased or the ECM was disconnected from permanent battery (B+) voltage, the readiness code must be generated again.