Instruction. The glow plug system is controlled by the glow plug control unit -J179-.
The used glow plugs -J179- have a self-diagnosis function. In the event of a malfunction in the pre-glow system, an error is stored in the engine control unit. The used glow plug -J179- is installed in the 3-gang relay board in the footwell, front left, in relay slot 2.
Function test
Remove plugs from glow plugs. Connect hand-held multimeter -VAG 1526C- to one of the plugs and to engine ground. Select the actuator diagnostic mode and switch on the glow plug relay. Set value: approx. battery voltage (every 5 seconds). If the specified value is not reached: Eliminate any open or short circuit in the wiring. Check glow plug relay -J52-. The diagnostic tester -VAS 5052- must be used.
Checking glow plugs (AMF, VNS)
Test condition: battery voltage at least 11.5 volts. Switch off the ignition. Remove plugs from glow plugs. Connect the wire of the LED indicator lamp using the terminals from the auxiliary and measuring tool set -VA1 1594 C- to the battery positive (+). Install test. probe of the control LED lamp in turn for each glow plug. LED on: Glow plug OK. LED does not light up: Remove and install glow plugs with 10-mm articulated wrench -VAS 3220-. Place the glow plug to be checked on a refractory surface. Connect the glow plug pin to the positive terminal of the charged 12 volt battery. Connect the glow plug thread to the negative battery terminal.
Instruction. To connect the glow plug, use wires with a minimum cross section of 2.5 mm2.
The wires must be equipped with stable terminals. Monitor the process of glowing the candle. If the spark plug does not glow or only part of the pin glows, the glow plug must be replaced.
Checking glow plugs (engine code ATL)
Instruction. On vehicles with engine code "ATL" function and conductivity of glow plugs should not be tested with a DC power source (e.g. 12 Volt battery). There is a risk of damage to the glow plugs.
Removal and installation of glow plugs
Disconnect the corresponding plug of the glow plug to be removed. Tightening torque: Glow plugs: 15 Nm.
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