Golf GLS L4-2.0L (AEG) (2001)
-
Check wiring between test box and 4-pin harness connector (to control module) for open circuit according to wiring diagram.
-
Terminal -3- + socket 25
-
Terminal -4- + socket 26
Wire resistance: max. 1.5 ohms
-
Check wiring at harness connector terminals -3- + -4- for short circuit to terminals -1- + -2- according to wiring diagram.
Specified value: Infinity ohms
-
If no malfunction is found in wiring, replace Engine Control Module (ECM).
With Generic Scan Tool
Oxygen Sensor (O2S) And Oxygen Sensor Control Before Three Way Catalytic Converter (TWC), Checking
NOTE:
-
Vehicle must be raised before connector for oxygen sensor is accessible.
-
When servicing terminals in harness connector of Heated Oxygen Sensor (HO2S), use only gold-plated terminals.
Recommended special tools and equipment
-
VAG1526 multimeter or VAG1715 multimeter
-
VAG1594 connector test kit
-
Wiring diagram
Test requirements
-
The respective fuses of Heated Oxygen Sensor (HO2S) -G39- must be OK.
-
Battery voltage must be at least 11.5 volts.
-
All electrical consumers like, for example, lights and rear window heating must be switched off.
-
Parking brake must be engaged or else daylight driving lights will be switched on.
-
For vehicles with automatic transmission, selector lever must be in position -P- or -N-.
-
If vehicle is equipped with an A/C system, it must be switched off.
-
Ground (GND) connections between engine and chassis must be OK.
-
Exhaust system must be properly sealed between catalytic converter and cylinder head.
-
Coolant temperature must be at least 80 degree C, Diagnostic mode 1: Check measuring values; PID 5, Coolant temperature. See: Testing and