90S Quattro (Canada) V6-2.8L (AAH) (1993)
CHECKING ACTIVATION OF FUEL INJECTORS
-
Disconnect harness connector on fuel injector to be tested.
-
Connect LED tester to connector terminal 1 and to battery positive (B+), or jumper to positive (B+) using cable from VW1594 connector test
kit.
-
Operate starter briefly (the engine can also turn over).
^
LED must blink
If the LED does not blink:
-
Check wiring and connections between connector terminal 1 (for fuel injector being tested) and ECM as follows:
-
Connect VAG 1598 test box with VAG 1598/12 adapter harness on wiring harness to ECM.
-
Harness connector is not connected to ECM.
Injector Circuit Test Connections
-
Check control wire for continuity between fuel injector connector terminal 1 (in engine compartment) and test box.
ECM And Injector Connectors
-
If necessary, eliminate break or short circuit in wiring between terminal 1 of fuel injector being tested, and corresponding terminal at ECM
connector -D-.
Terminal 1 on fuel
Terminal on
injector connector
ECM connector D
for cylinder number:
1
4
2
5
3
6
4
9
5
10
6
13
If, in the previous test above, the LED does not flash for any of the fuel injectors:
-
Check voltage supply for ECM.