Examination
1. If you have a current clamp, clamp it over the individual wires going to the glow plugs, set the ignition to warm (the engine is cold) and measure the current consumption. Wire placement: Cylinder 1 = black and blue; cylinder 2 = black-violet; cylinder 3 = black and red; cylinder 4 = black and yellow; cylinder 5 = black and green.
2. 2.0L engine: After about 8 seconds, each glow plug should draw about 14-16A.
3. 2.2/2.5L engine: After approximately 10–20 seconds, the current consumption of each glow plug should briefly be approximately 8–15 A.
4. If the measured value exceeds the upper specified value, replace the corresponding glow plug.
5. If the measured value is below the lower set value of the glow plug, check the current-carrying line for a break.
6. If you don't have a current clamp, set the ignition to warm up (the engine is cold) and connect a test lamp between the glow plug terminal and the engine block. The test lamp should flash, otherwise check the current-supply wire to the glow plug for a break and replace it accordingly.
7. Turn off the ignition.
8. Check the glow plugs for electrical current. To do this, remove the plug for the glow plugs G1–G4 (G5) on the heating control relay.
9. Measure the resistance between the plug pins and the body one by one with an ohmmeter (engine cylinder block). If the resistance tends to infinity (oo), then there is a break in the glow plug or in the current supply line.
Caution! The heating control relay has an electronic short-circuit protection. If there is a short circuit in the glow plugs or electrical wires, the current circuit is interrupted. The relay can function again when the short circuit is eliminated or the ignition key is turned back to position "0".
Engine 2.0 l
Removal
1. Remove the intake manifold.
2. Unscrew the nut for the electrical line.
Please note: Some models have a nut inserted as an integral accessory into the cable end of the line.
3. Remove the glow plug using a flexible socket wrench SW 12.
Engine 2.2/2.5 l
Removal
1. Remove the plug (arrow) with the glow plug.
2. Unscrew the glow plug (R9) using a SW 12 socket wrench.
Glow plugs with burnt pins
Burnt glow plug pins are often the result of injector failures that are not caused by faults in or on the glow plugs.
If such glow plugs are detected, it is not enough to replace them. It is also necessary to check the injectors for the formation of the jet of injected fuel, vibration, pressure and tightness (work for a car repair shop).
Installation
1. Screw in the glow plugs to a torque of 20 Nm.
2. Screw the electrical line together with the nut with a torque of 4 Nm, then manually, respectively, with the plug.
3. 2.0L engine: Remove the intake manifold.
4. 2.2/2.5L engine: Remove the air cleaner cross pipe.