Preheating system/removal and installation of glow plugs (Mondeo 1)

If you have problems starting the engine, you should first check the engine compression. If the compression pressure is too low, the engine will not start at low temperatures. Measure the compression, see paragraph 1.18.

Checking the power supply

Connect a test light between the fourth cylinder and the vehicle ground.

Turn the ignition switch to position II, the control lamp should light up at the same time. If the lamp does not light up, then it is necessary to check the power supply according to the electrical diagram.

Attention! Keep the ignition switch in position II for no more than 15 seconds.

Checking/replacing glow plugs

Disconnect the negative (-) cable from the battery.

Warning! This will erase data in electronic memory devices, such as the engine fault memory device or the radio code. Please read the section carefully "Removing and installing the battery", before disconnecting it.

Unscrew the glow plug supply wire from bracket "4" and wrap it with insulating tape. 5 - vacuum pump.





Remove the connecting wire and the current bus for the glow plugs.



Connect the voltmeter to the positive pole (+) of the battery and connect it to each spark plug in series. The LED lights up, meaning current is flowing: the glow plug is OK.

LED does not light: glow plug is defective, replace it; tightening torque: 30 Nm.

Attention! Strictly adhere to the prescribed tightening torque, otherwise the annular gap between the glow rod and the threaded part will close, the spark plug will fail prematurely.

Connect the connecting wire to the current busbar. Tighten the nuts with a torque of 5 Nm.

Connect the ground (-) wire to the battery. Set the existing clock and set the radio code.

Checking the glow plug relay

Remove the battery. The preheat relay is located under the battery bracket.



Connect a voltmeter to terminal 30 (+) of the preheat relay multi-pole plug and to ground (-). The LED in the voltmeter should light, otherwise check the battery power supply.

Connect a voltmeter to terminal 86 (terminal 15) and to ground. Turn on the ignition. The LED in the voltmeter should light up, otherwise check the power supply from the ignition switch.

Connect the voltmeter to terminal 50 and ground. Have the assistant turn on the starter briefly. The LED in the voltmeter should light up, otherwise check the power supply to the ignition switch.

If the LED in the voltmeter lights up, check the power wires to the glow plugs and replace them if necessary. Otherwise, replace the preheat relay.

Install the battery, see item 20.14.

Glow plugs with burnt pins

Burnt glow plug pins are a result of jet failures. Such failures do not cause problems in or on the glow plugs.



If you suddenly find such "arrow" glow plugs, it is not enough to simply replace them. It is necessary to check the jets (fuel spray, rattling, pressure, tightness) (the work is carried out in the workshop).