Checking Heating Plugs - Volkswagen Fox 2004 Workshop Manual

Note
When removing the sensor, the "cold" engine condition is simu‐
lated, and when switching the ignition on, the combustion cham‐
ber pre-heating period will occur.
– Remove heating plug connectors.
– Connect the multimeter to measure voltage between the heat‐
ing plug connector and vehicle earth.
– Start the ignition during approx. 20 seconds. The battery volt‐
age shall appear on the panel.
– If no voltage is indicated⇒ Vehicle diagnosis, testing and in‐
formation system VAS 5051.
1.1

Checking heating plugs

Special tools and workshop equipment required
♦ Auxiliary measuring cable set -VAG 1594C-
♦ Spanner -3320-
♦ Test probe -VAG 1527B-
Test conditions
• Battery voltage at least 11.5 V
• Ignition switched off.
Test sequence
– Remove heating plug connectors.
3 - Cyl. diesel engine - Edition 02.2009
1. Chamber pre-heating system - check
Fox 2004 ➤
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