Engine Control System

^ All the possible Diagnostic Trouble Codes (DTC) that can be recognized by the Engine Control Module (ECM) J192 are listed in the following charts in ascending numerical sequence. There are two sets to Diagnostic Trouble Code charts.
- Diagnostic Trouble Code Charts By VAG Codes, listing DTC's by the codes output from a VAG Scan Tool.
- Diagnostic Trouble Code Charts By P-Codes, listing DTC's by the codes output from a Generic Scan Tool.
^ Malfunctions for which the Malfunction Indicator Lamp (MIL) will never switch ON or will immediately switch ON, are set to "sporadic" at every engine start. If the same malfunction occurs again, the MIL will light up and the malfunction will no longer be sporadic, but permanent. Malfunctions for which the MIL comes ON can only be checked and erased using the VAG 1551 Scan Tool (ST) or a generic scan tool.
^ Before replacing a component diagnosed with a malfunction, first check the wiring to that component for open or short circuits according to the wiring diagram.
^ Before eliminating malfunctions or replacing components, use the Fluke 83 multimeter or equivalent (set to ohms range), to check the ECM J192 Ground (GND) connections by testing terminals 3,7 and 12 of connector D as well as terminals 3, 7,and 11 of connector E (must be 0-0.5 ohms; continuity). Also check engine GND connections for corrosion or damage, and check the fuel pump relay.
^ When a system malfunction occurs, the Malfunction Indicator Lamp (MIL) may not be activated (switched on) immediately. Rather, the MIL may only light up when a malfunction occurs after two drives, one after another, with or without a preceding cold start 10° to 30°C (1° to 86°F). Address word 33 lists only those DTC's (malfunctions) that switch the MIL ON. Address word 01, function 02 list invalidated DTC's (malfunctions) for which the MIL has not yet switched ON or will never switch ON.
^ The following DTC's (malfunctions) will switch the MIL ON and will be stored in address word 33 after two drives, one after the other, with a preceding cold start and the same occurring malfunction: P0133/16517, P0153/16537, P0170/16554, P0171/16555, P0172/16556, P0173/16557, P0174/16558, P0175/16559, P0401/16785, P0402/16786, P0422/16806 and P0432/16816.
^ The following DTC's (combustion misfire with a low misfire rate) will switch the MIL ON and will be stored in address word 33 after two drives, one after the other, with the same malfunction but without a preceding cold start: P0300/16684, P0301/16685, P0302/16686, P0303/16687, P0304/16688, P0305/16689 and P0306/16690.
^ Combustion misfire with high misfire rate is immediately identified by a flashing MIL. Because the Three Way Catalytic Converter (TWC) could be damaged by this condition, drive only at a reduced speed and do not subject engine to heavy loads (i.e. rapid acceleration). Check DTC memory and repair the malfunction as soon as possible. If the MIL stops flashing, normal engine operation can be resumed.