Volkswagen Fox (2004 year). Manual - part 31

Solenoid valve connections
1 - Turbocharger air filter hose.
2 - Turbocharger vacuum unit.
3 - Overcharge pressure connection in the turbocharger.
4 - BNM engine code - sealed.
5 - Air filter.
6 - Vacuum connection (in the non-return valve to servo

brake ).

7 - Exhaust gas recirculation valve.

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Chamber pre-heating system - check

Special tools and workshop equipment required
♦ Portable multimeter -VAG 1526C-

♦ Auxiliary measuring cable set -VAG 1594C-

Test conditions:
• Battery voltage at least 11.5 V
• Ignition switched off.
• Direct injection diesel system command unit -J248- OK.
• Fuse 4 (30) in the fuse-holder -S176- , Fuse 5 (30) in the fuse-

holder -S177- and Fuse 6 (30) the fuse-holder -S178- of the

battery OK.

Test sequence
– Remove the connector of the coolant temperature sensor.

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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.

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positive (+) terminal.

– Position the Test probe -VAG 1527B- on each heating plug,

one-by-one. Diode lights up: heating plug OK. If diode does

not light up: replace heating plug.

– Remove and install heating plugs with Spanner -3320- . Tight‐

ening torque: 15 Nm.

02.09

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