Jetta Sedan L5-2.5L (CBTA) (2009)
-
Check the wiring connections from the Battery to the Motronic Engine Control Module (ECM) Power Supply Relay (J271) socket 1 for an open or
a short circuit.
-
Check the wiring connections for damage, corrosion, loose or broken terminals.
-
If necessary, repair the faulty wiring connection.
If the specified value was obtained:
-
Switch the ignition on.
-
Using a multimeter, check the Motronic Engine Control Module (ECM) Power Supply Relay Box socket 3, (for relay terminal 86) to Ground
(GND).
Specified value: battery voltage.
-
If the specified value was not obtained:
-
Remove Fuse 10 in Fuse Box B and check resistance of circuit between fuse and relay terminal socket 1.
Specified value: 1.5 ohm or less.
-
If fuse is blown, locate short to ground in circuit, refer to wiring diagram.
-
Repair as necessary.
If the specified value was obtained:
Checking activation
-
Remove the Motronic Engine Control Module (ECM) Power Supply Relay (J271).
-
Using a diode test lamp (12V) connected to Battery +, check the Motronic Engine Control Module (ECM) Power Supply Relay Box socket 4 (for
relay terminal 85) while cranking the engine.
The test lamp should be ON.
-
Switch the ignition off.
If the test lamp was ON:
-
Replace the Motronic Engine Control Module (ECM) Power Supply Relay (J271).
If the test lamp was not ON:
-
Using a multimeter, check the Motronic Engine Control Module (ECM) Power Supply Relay socket 4 (for relay terminal 85), to the Motronic
Engine Control Module (ECM) (J623) electrical harness connector T121 terminal 23 for resistance.
Specified value: 1.5 ohms Max.
If the specification was not obtained:
-
Check the wiring connection for an open circuit, high resistance or short circuit to Battery (+).
-
Check the wiring connection for damage, corrosion, loose or broken terminals.
-
If necessary, repair the faulty wiring connection.
If no malfunction is found in the wiring and ground was not present from the ECM during crank:
-
Replace the Motronic Engine Control Module (ECM) (J623). Refer to --> [ Motronic Engine Control Module, Replacing ] See: Service and
Repair/Motronic Engine Control Module, Replacing.
Final procedures