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.
Fox 2004 ➤
2. Exhaust gas recirculation system
121
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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122
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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1. Chamber pre-heating system - check
123
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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124
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