Volkswagen Golf Mk4 (1997-2006) nca Wiring diagrams

1.8L 1.9L, 2.0L 1.9L: (EARLY PROD 2004) (1.8L, 2.0L, 2.8L, 3.2L) 1.9L: (LATE PROD 2004, 2005) 2.0L 3 6 (4-SPEED A/T) (5-SPEED A/T) 5 SPEED A/T A/C CLUTCH ABS CONTROL MODULE AFTER- BATTERY BLK WIRE BRAKE FLUID LEVEL WARNING SWITCH BRAKE PRESSURE SWITCH (5-SPEED A/T) BRN WIRE BRN/BLK WIRE BRN/RED WIRE COOLANT FAN COOLANT FAN CONTROL MODULE COOLANT FAN CONTROL THERMAL SWITCH (MAN A/C) COOLANT PUMP DIESEL DIRECT FUEL INJECTION (DFI) ENGINE CONTROL MODULE (1.9L) DUAL TONE HORN EXCEPT 1.9L GLOWPLUG TRIGGERING CONTROL MODULE (1.9L) HIGH PRESSURE SENSOR HOOD ALARM SWITCH (W/ ANTI- THEFT) IGNITION COIL IGNITION COIL 1 IGNITION COIL 2 IGNITION COIL 3 IGNITION COIL 4 IGNITION COIL 5 IGNITION COIL 6 INTAKE FLAP MOTOR (1.9L LATE PROD 2004, 2005) LEFT COOLANT FAN LEFT FRONT SIDE MARKER LIGHT LEFT HEADLIGHT/ TURN SIGNAL/ PARK LIGHT ASSEMBLY LEFT SIDE TURN SIGNAL LIGHT MOTRONIC ENGINE CONTROL (ECM) MODULE (1.8L, 2.0L, 2.8L, 3.2L) MULTIFUNCTION TRANSMISSION RANGE SWITCH NCA WIRE PARK/ NEUTRAL POSITION (PNP) RELAY POSITIVE CRANKCASE VENTILATION (PCV) HEATING ELEMENT RED WIRE RIGHT COOLANT FAN RIGHT FRONT SIDE MARKER LIGHT RIGHT HEADLIGHT/ TURN SIGNAL/ PARK LIGHT ASSEMBLY RIGHT SIDE TURN SIGNAL LIGHT RUN WIRE SECONDARY AIR INJECTION (AIR) PUMP MOTOR SPEEDOMETER VEHICLE SPEED SENSOR (VSS) TOP OF TRANSMISSION) TRANS- MISSION CONTROL MODULE (TCM) WINDSHIELD WIPER MOTOR YEL WIRE

AIR BAG SPIRAL SPRING/ RETURN SPRING WITH SLIP RING BLK WIRE BLK/BLU WIRE BLU WIRE BRN WIRE BRN/BLU WIRE COMPUTER DATA LINES SYSTEM DUAL HORN RELAY FUSE 40 FUSE 5 FUSE PANEL FUSE PANEL (BEHIND LEFT SIDE OF DASH) GRN WIRE GRN/WHT WIRE HORN HORN SWITCH HOT AT ALL TIMES HOT IN RUN OR START IGNITION SWITCH LOAD REDUCTION RELAY MULTI-FUNCTION STEERING WHEEL CONTROL MODULE NCA WIRE OFF ORG/BRN WIRE ORG/GRN WIRE RED WIRE STEERING WHEEL CONTROL UNIT THIRTEENFOLD AUXILIARY RELAY PANEL (UNDER LEFT SIDE OF DASH) WHT WIRE YEL WIRE

BLK WIRE BLK/VIO WIRE BLU WIRE BLU/RED WIRE BLU/WHT WIRE BLU/YEL WIRE BRN WIRE BRN/RED WIRE BRN/YEL WIRE EARLY PRO- DUCTION 2003 ENGINE SPEED (RPM) SENSOR (ON LEFT SIDE OF ENGINE BLOCK) FUEL PUMP (IN FUEL TANK) FUSE 28 FUSE 32 FUSE 34 FUSE 43 FUSE PANEL FUSE/ BRACKET BATTERY FUSE 162 GRN WIRE GRN/BRN WIRE GRN/VIO WIRE GRN/WHT WIRE GRY WIRE GRY/BRN WIRE GRY/RED WIRE GRY/WHT WIRE HOT AT ALL TIMES INSTRUMENT CLUSTER KNOCK SENSOR 1 (ON LEFT FRONT SIDE OF ENGINE BLOCK) KNOCK SENSOR 2 (BEHIND IGNITION COIL) MALFUNCTION INDICATOR LAMP NCA WIRE RED WIRE RED/BLK WIRE RED/VIO WIRE SECONDARY AIR INJECTION PUMP MOTOR (ON LEFT REAR SIDE OF ENGINE) SECONDARY AIR INJECTION PUMP RELAY (IN LEFT SIDE OF ENGINE COMPT) WHT WIRE WHT/RED WIRE YEL WIRE YEL/BLK WIRE YEL/GRN WIRE

BLK WIRE BLK/VIO WIRE BLU WIRE BLU/GRN WIRE BLU/GRY WIRE BLU/YEL WIRE BRAKE LIGHT SWITCH (ABOVE BRAKE PEDAL) BRN WIRE BRN/BLU WIRE CAMSHAFT POSITION SENSOR (BEHIND CAMSHAFT SPROCKET) CLUTCH VACUUM VENT VALVE SWITCH (ABOVE CLUTCH PEDAL) CRUISE CONTROL SYSTEM FUEL INJECTORS FUSE 13 FUSE 5 FUSE PANEL (BEHIND LEFT SIDE OF DASH) GRN WIRE GRN/RED WIRE GRN/VIO WIRE GRN/WHT WIRE GRN/YEL WIRE GRY WIRE GRY/RED WIRE GRY/WHT WIRE HOT AT ALL TIMES MOTRONIC ENGINE CONTROL MODULE (AT BASE OF WINDSHIELD IN CENTER OF PLENUM) NCA WIRE NOT USED RED WIRE RED/BLK WIRE RED/VIO WIRE THROTTLE VALVE CONTROL MODULE (ON THROTTLE BODY) TO SPARK PLUG VIO WIRE VIO/BLU WIRE VIO/GRN WIRE VIO/RED WIRE VIO/WHT WIRE VIO/YEL WIRE WHT WIRE WHT/RED WIRE YEL/GRN WIRE

A/C SYSTEM BLK WIRE BLK/BRN WIRE BLK/RED WIRE BLK/VIO WIRE BLK/WHT WIRE BLU WIRE BLU/GRN WIRE BLU/RED WIRE BLU/VIO WIRE BLU/WHT WIRE BLU/YEL WIRE BRN WIRE BRN/BLU WIRE BRN/RED WIRE BRN/WHT WIRE BRN/YEL WIRE COMPUTER DATA LINES SYSTEM CRUISE CONTROL SYSTEM FUEL PUMP RELAY FUSE 163 FUSE 29 FUSE 37 FUSE PANEL FUSE/ BRACKET BATTERY GRN WIRE GRN/BRN WIRE GRN/GRY (OR GRN) WIRE GRN/RED WIRE GRN/VIO WIRE GRN/WHT WIRE GRN/YEL WIRE GRY WIRE GRY/BLU WIRE GRY/BRN WIRE GRY/RED WIRE GRY/WHT WIRE HEATED OXYGEN HOT AT ALL TIMES HOT IN RUN OR START IGNITION SWITCH LEAK DETECTION PUMP (IN RIGHT REAR WHEELHOUSE) LOCK MOTRONIC ENGINE CONTROL MODULE (AT BASE OF WINDSHIELD IN CENTER OF PLENUM) NCA WIRE ORG/BLK WIRE ORG/BRN WIRE OXYGEN POWER SUPPLY RELAY RED WIRE RED/BLK WIRE RED/BRN WIRE RED/GRN WIRE RED/GRY WIRE RED/VIO WIRE RED/WHT WIRE RED/YEL WIRE RELAY PANEL RUN WIRE STARTING/ CHARGING SYSTEM THROTTLE POSITION SENSOR/ ACCEL PEDAL POSITION SENSOR VIO WIRE VIO/GRN WIRE VIO/RED WIRE VIO/WHT WIRE WHT WIRE WHT/BLU WIRE WHT/RED WIRE WHT/YEL WIRE YEL/BRN WIRE YEL/GRN WIRE YEL/RED WIRE

A/T BLK WIRE BLK/VIO WIRE BLU WIRE BLU/GRN WIRE BLU/WHT WIRE BLU/YEL WIRE BRAKE SYSTEM VACUUM PUMP BRAKE VACUUM PUMP FUSE BRN WIRE BRN/RED WIRE BRN/YEL WIRE ENGINE SPEED (RPM) SENSOR (ON LEFT SIDE OF ENGINE BLOCK) FUEL PUMP (IN FUEL TANK) FUSE 1 FUSE 28 FUSE 32 FUSE 34 FUSE 43 FUSE PANEL FUSE/ BRACKET BATTERY GRN WIRE GRN/VIO WIRE GRN/WHT WIRE GRY WIRE GRY/BRN WIRE GRY/RED WIRE GRY/WHT WIRE HOT AT ALL TIMES INSTUMENT CLUSTER KNOCK SENSOR 1 (ON LEFT FRONT SIDE OF ENGINE BLOCK) KNOCK SENSOR 2 (BEHIND IGNITION COIL) MALFUNCTION INDICATOR LAMP NCA WIRE RED WIRE RED/BLK WIRE RED/VIO WIRE RELAY PANEL SECONDARY AIR INJECTION PUMP MOTOR (ON LEFT REAR SIDE OF ENGINE) SECONDARY AIR INJECTION PUMP RELAY (IN LEFT SIDE OF ENGINE COMPT) WHT WIRE WHT/RED WIRE YEL WIRE YEL/BLK WIRE YEL/GRN WIRE

BLK WIRE BLK/VIO WIRE BLU WIRE BLU/GRN WIRE BLU/GRY WIRE BLU/YEL WIRE BRAKE LIGHT SWITCH (ABOVE BRAKE PEDAL) BRN WIRE BRN/BLU WIRE CAMSHAFT POSITION SENSOR (BEHIND CAMSHAFT SPROCKET) CLUTCH VACUUM VENT VALVE SWITCH (ABOVE CLUTCH PEDAL) CRUISE CONTROL SYSTEM FUEL INJECTORS FUSE 13 FUSE 5 FUSE FOR VALVE CAMSHAFT ADJUSTMENT FUSE PANEL (BEHIND LEFT SIDE OF DASH) GRN WIRE GRN/VIO WIRE GRN/WHT WIRE GRN/YEL WIRE GRY WIRE GRY/RED WIRE GRY/WHT WIRE HOT AT ALL TIMES MOTRONIC ENGINE CONTROL MODULE (AT BASE OF WINDSHIELD IN CENTER OF PLENUM) NCA WIRE RED WIRE RED/BLK WIRE RED/VIO WIRE TEMPERATURE SENSOR 1 FOR CATALYST THROTTLE VALVE CONTROL MODULE (ON THROTTLE BODY) TO SPARK PLUG VALVE 1 FOR CAMSHAFT ADJUSTMENT VIO WIRE VIO/BLU WIRE VIO/GRN WIRE VIO/RED WIRE VIO/WHT WIRE VIO/YEL WIRE WHT WIRE WHT/RED WIRE YEL WIRE YEL/GRN WIRE

A/C SYSTEM BLK WIRE BLK/RED WIRE BLK/VIO WIRE BLK/WHT WIRE BLU WIRE BLU/GRN WIRE BLU/RED WIRE BLU/VIO WIRE BLU/WHT WIRE BLU/YEL WIRE BRN WIRE BRN/BLU WIRE BRN/RED WIRE BRN/WHT WIRE BRN/YEL WIRE COMPUTER DATA LINES SYSTEM CRUISE CONTROL SYSTEM FUEL PUMP RELAY FUSE 163 FUSE 29 (BEHIND LEFT SIDE OF DASH) FUSE 37 FUSE PANEL FUSE/ BRACKET BATTERY GRN WIRE GRN/BRN WIRE GRN/GRY (OR GRN) WIRE GRN/VIO WIRE GRN/WHT WIRE GRY WIRE GRY/BLU WIRE GRY/BRN WIRE GRY/RED WIRE GRY/WHT WIRE HEATED OXYGEN HOT AT ALL TIMES HOT IN RUN OR START IGNITION SWITCH LEAK DETECTION PUMP (IN RIGHT REAR WHEELWELL) LOCK MASS AIRFLOW (MAF) SENSOR (IN INTAKE AIR DUCT) MOTRONIC ENGINE CONTROL MODULE (AT BASE OF WINDSHIELD IN CENTER OF PLENUM) MOTRONIC ENGINE CONTROL MODULE POWER SUPPLY RELAY (BEHIND AIR CLEANER HOUSING) NCA WIRE ORG/BLK WIRE ORG/BRN WIRE OXYGEN RED WIRE RED/BLK WIRE RED/GRN WIRE RED/GRY WIRE RED/VIO WIRE RED/YEL WIRE RELAY PANEL RUN WIRE STARTING/ CHARGING SYSTEM SUPPLEMENTAL RESTRAINTS SYSTEM THROTTLE POSITION SENSOR/ ACCEL PEDAL POSITION SENSOR VIO WIRE VIO/BLK WIRE VIO/GRN WIRE VIO/RED WIRE VIO/WHT WIRE WHT WIRE WHT/BLU WIRE WHT/GRN WIRE WHT/RED WIRE WHT/YEL WIRE YEL/BRN (OR YEL/GRN) WIRE YEL/BRN WIRE YEL/GRN WIRE

BLK WIRE BLK/VIO WIRE BLU WIRE BLU/GRN WIRE BLU/WHT WIRE BLU/YEL WIRE BRN WIRE BRN/RED WIRE BRN/YEL WIRE ENGINE SPEED (RPM) SENSOR (ON LEFT SIDE OF ENGINE BLOCK) FUEL PUMP (IN FUEL TANK) FUSE 28 FUSE 32 FUSE 34 FUSE 43 FUSE PANEL GRN WIRE GRN/VIO WIRE GRN/WHT WIRE GRY WIRE GRY/BRN WIRE GRY/WHT WIRE HOT AT ALL TIMES FUSE/ BRACKET BATTERY FUSE 162 INSTUMENT CLUSTER KNOCK SENSOR 1 (ON LEFT FRONT SIDE OF ENGINE BLOCK) KNOCK SENSOR 2 (BEHIND IGNITION COIL) MALFUNCTION INDICATOR LAMP NCA WIRE RED WIRE RED/BLK WIRE RED/VIO WIRE SECONDARY AIR INJECTION PUMP MOTOR (ON LEFT REAR SIDE OF ENGINE) SECONDARY AIR INJECTION PUMP RELAY (IN LEFT SIDE OF ENGINE COMPT) WHT WIRE WHT/RED WIRE YEL WIRE YEL/BLK WIRE YEL/GRN WIRE

BLK WIRE BLK/VIO WIRE BLU WIRE BLU/GRN WIRE BLU/GRY WIRE BLU/YEL WIRE BRAKE LIGHT SWITCH (ABOVE BRAKE PEDAL) BRN WIRE BRN/BLU WIRE CAMSHAFT POSITION SENSOR (BEHIND CAMSHAFT SPROCKET) CLUTCH PEDAL POSITION SWITCH (M/T) (ABOVE CLUTCH PEDAL) CRUISE CONTROL SYSTEM FUEL INJECTORS FUSE 13 FUSE 5 GRN WIRE GRN/VIO WIRE GRN/WHT WIRE GRN/YEL WIRE GRY WIRE HOT AT ALL TIMES BRAKE VACUUM PUMP FUSE HOT AT ALL TIMES FUSE PANEL (BEHIND LEFT SIDE OF DASH) MOTRONIC ENGINE CONTROL MODULE (AT BASE OF WINDSHIELD IN CENTER OF PLENUM) NCA WIRE RED WIRE RED/BLK WIRE RED/VIO WIRE THROTTLE VALVE CONTROL MODULE (ON THROTTLE BODY) TO SPARK PLUG TO SPARK TO SPARK PLUG PLUG VIO WIRE VIO/BLU WIRE VIO/GRN WIRE VIO/RED WIRE VIO/WHT WIRE VIO/YEL WIRE WHT WIRE WHT/RED WIRE YEL/GRN WIRE