Table of contents: Checking the power supply ↓ Checking glow plugs ↓
If you have difficulty starting the engine, you should check the operation of all glow plugs.
The engine must be cold when checking (ambient temperature), battery - fully charged (voltage not less than 11.5 V).
Checking the power supply
This check is performed with the glow plugs installed.
1. Remove the top engine covers, refer to Section Removal and installation the upper engine cover/lower engine compartment protection/subframe.
2. Disconnect the glow plug connectors, for example, using a special clamp HAZET 4760-5.
3. Turn on the test lamp between the cable contact and ground.
4. Turn on the ignition, warm up the engine. Leave the ignition key in the pre-glow position and watch the lamp. The lamp should light. Similarly, check the power supply to all glow plugs.
5. Connect the glow plug connectors.
Checking glow plugs
1. Apply an ohmmeter to each glow plug in turn and check if electrical current flows between the cylinder block and the glow plug.
2. If no current flows (0 W), the glow plug is damaged and must be replaced.
3. Connect the glow plug connectors.
4. Reinstall the engine top covers, refer to Section Removal and installation the upper engine cover/lower engine compartment protection/subframe.
[Text provided by the online resource «AudiManual»]