Golf III L4-1984cc 2.0L SOHC (1993)
1. What is the symptom?
2. Under what conditions does it occur?
3. Is this the first repair for this complaint?
4. Has any other work been recently performed on the car?
BASIC AND VISUAL CHECKS
5. Check wires for slack. Check ground connections. Make sure all harnesses are stress free and wire insulation is not brittle and does not hide broken
wires. If necessary perform voltage drop tests to verify connections.
6. Check system for vacuum and air leaks.
^
VAG 1551 Scan Tool Procedure Remember turn printer on and print ECM version, Diagnostic Trouble Codes (DTC's) and measuring block
values.
Read stored DTC's, observe block values, and verify customer complaint.
Follow VAG 1551 connection and DTC memory check and erasing as described in the Golf III GTI, Jetta III, Cabrio 2.0 Liter Fuel Injection & Ignition
Repair Manual.
Refer to sections 01-11 through 01-24 for DTC table.
If a DTC exists, perform prescribed repairs, erase DTC memory and verify repair.
If complaint still exists perform the following tests:
^
Insure that brown/red wire and the red/white wires of the harness match up to the white wires of the Oxygen sensor heater connector.
^
Perform a resistance test on the heating element to verify that the heater element resistance is approximately 2 Ohms.
Power Supply Checking - Heated Oxygen Sensor
HEATED OXYGEN SENSOR HEATING CIRCUIT POWER SUPPLY, CHECKING
-
Disconnect the Heated Oxygen sensor harness connector from the Oxygen sensor.
-
connect VAG 1527B LED tester to harness connector using cables from VW 1594 adapter kit. (Terminals 1 and 2, red/white and brown/white
wires).
-
Start engine and let idle
-
LED must light up
If Not:
-
Repair short/open circuit useing wiring diagram.
