Heater plugs absorption check

Check that the battery voltage with no load is not below 12.6 V

Place the 1000 Amp ammeter clamp for the Examiner equipment on the lead of the glow heater plug being tested.

Turn the key to the ON position and check the current uptake of the heater plug in question

The peak average rated current level should be about 13A

Checks must be carried out at a constant voltage of 11 V

If the heater plugs do not heat up correctly move on to Step 2

Heater plugs power supply check

With the ignition on (engine cold) check that the power supply for the individual heater plugs is correct during the preheating stage

Restore the electrical continuity for the supply leads and for the cable coming from the engine control unit and ensure the cables and the connections for the wiring involved are correctly fastened

See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT

If the check is OK

Replace glow heater plug control unit

Op. 5520C20 HEATER PLUGS CONTROL UNIT - R.R

If the check is OK

Replace the engine management control unit

Op. 1060G80 DIESEL ELECTRONIC INJECTION CONTROL UNIT - R.R

Heater plugs check

Disconnect the wiring from the heater plug in question

Using the Examiner in the ohmmeter function, connect the probes between the body of the heater plug and the threaded end of the heater plug.

Check that the resistance for each individual heater plug is between 0.5 and 1 Ohm at 20°C

Replace the heater plug

Op. 5520C10 HEATER PLUGS - R+R