Checking the technical condition
1. Glow plug
2. Glow plug plate
3. Glow plug connector
4. Glow plug relay
Preheating system
1. Conditions for conducting a technical condition check:
Battery voltage: 12V.
Coolant temperature: less than 30°C.
2. Disconnect the coolant temperature sensor connector.
Attention. After completing the test, reconnect the coolant temperature sensor connector.
3. Connect a voltmeter between the glow plug plate and the spark plug body (weight).
4. Check up the indication of the voltmeter at the included lock of ignition.
5. Check that the glow plug indicator light comes on for approximately 6 seconds and indicates battery voltage (about 9 V or higher) within 20 seconds immediately after switching the ignition key to the position «ON» (at a coolant temperature of 20°C).
Note: The conduction time of the circuit may vary depending on the coolant temperature.
6. After checking (point 5) turn the ignition switch to the START position.
7. The system is healthy if the battery voltage (about 9 V or higher) is formed in the process of cranking the crankshaft for about 6 seconds after starting (at a coolant temperature of 20°C).
8. If the voltage or conduction time of the circuit is not correct, check the voltage at the terminals of the heating control unit and individual parts.
Glow plugs
1. Check the conductivity of the glow plug between its output and the body, as shown in the figure. Replace the spark plug with a new one if there is no continuity or high resistance.
Attention. Since the resistance of the glow plug is very low, it is necessary to degrease the plug before measuring it.
2. Check the glow plug plate for rust.
3. Check the glow plug for damage.
Glow plug relay
1. Disconnect the glow plug relay harness and then remove it.
2. Test the glow plug relay for a short/open at each point on the circuit with a multimeter (range 1 MΩ): (1) Check for short/open between terminals 87 and 31.
(2) Check for short/open between terminals «G» and 30.
Connect (+) probe to terminal 30, and (-) probe - to the terminal «G».
Connect (+) probe to terminal «G», A (-) probe - to terminal 30.