Passat Syncro Wagon V6-2771cc 2.8L DOHC (AHA) (1998)
Malfunction Indicator Lamp: Testing and Inspection
Malfunction Indicator Lamp (MIL) Function, Checking
Checking function
-
Switch ignition on.
MIL must light up.
-
If MIL does not light
when ignition is switched on, check wiring to MIL as follows:
Cause:
Corrective action:
MIL is not triggered, or does
not light, due to faulty wiring or open circuit.
Switch ignition off.
Connect VAG1598/22 test box.
Connect jumper wire to bridge test box sockets 2 and 17.
Switch ignition on.
MIL must light up.
Switch ignition off.
Check bulb for MIL.
If bulb is OK:
Check wiring for open circuit between MIL and Motronic ECM -J220- using applicable wiring diagram.
If wiring is OK:
Malfunction:
Motronic ECM -J220- is faulty; replace.
If MIL lights up when ignition is switched on, continue checking as follows:
-
Start engine and let run at idle.
MIL must go out after a few seconds.
If MIL does not go out:
-
Check Diagnostic Trouble Code (DTC) memory.
If there are no malfunctions stored in DTC memory:
Cause:
Corrective action:
MIL is triggered continuously
due to short circuit to Ground.
- Switch ignition off.
- Connect VAG1598122 test box.
- Check resistance between test box socket 17 and vehicle Ground, specified value: Infinity Ohm (no
continuity)
If the specified value is not obtained:
- Check for short circuit to Ground in wiring from Motronic Engine Control Module (ECM) - J220- to MIL.
G- Trace malfunction using applicable wiring diagram and repair as necessary.
If there is no continuity, and no short circuit to Ground:
Malfunction:
Motronic ECM -J220- is faulty; replace