Glow heater plug control unit operation check
- Make
- Fiat
- Model
- Bravo Factory Service Manual
- Year
- 2007–2014
- Section
- Engine starting › Glow heater plug control unit operation check
GLOW HEATER PLUG CONTROL UNIT OPERATION CHECK
| STEP | CHECK TO BE PERFORMED | REMEDIAL ACTION IF THE CHECK IS NOT OK |
|---|---|---|
| 1 | Preheating control unit power supply check Turn the key to the MAR position Using an Examiner in Voltmeter mode, check that there is a 12 V battery voltage between pin 3 and earth See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT Move on to Step 2 | Restore the electrical continuity of the supply lead See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT Restore the 15 A fuse (F11) in the fuse box after having identified the cause of the problem. Replace main relay Replace the junction unit Op. 5505A13 ADDITIONAL JUNCTION UNIT IN ENGINE COMPARTMENT - R.R. |
| 2 | Check earth connection Disconnect negative battery cable Disconnect the wiring from the glowheater plugs control unit Reconnect the negative battery cable Using an Examiner In Ohmmeter mode, connect between pin 1 of the wiring and earth See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT Check that the resistance is less than 1 Ohm Move on to Step 3 | Restore the electrical continuity of the earth lead |
| 3 | Check on preheating control unit activation control by engine control unit Turn the key to the MAR position Using an Examiner in Voltmeter mode, check that there is a voltage of around 8 V between pin 2 and earth See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT Start the engine and check that the voltage switches to 0 Volts Move on to Step 4 | Restore the wiring between the engine management control unit and the preheating control unit. If the voltage is interrupted Replace the engine management control unit Op. 1060G80 DIESEL ELECTRONIC INJECTION CONTROL UNIT - R.R and carry out the correct operation renewal procedure |
| 4 | Check on return signal from preheating control unit to engine management control unit Using an Examiner in Voltmeter mode, check that there is a 0 V voltage between pin 5 and earth See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT Start the engine and check that the voltage switches to 12 Volts See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT Move on to Step 5 | Restore the wiring between the preheating control unit and the engine control unit. If OK Replace glow plug preheating control unit Op. 5520C20 HEATER PLUGS CONTROL UNIT - R.R and carry out the correct operation renewal procedure |
| 5 | Check on power supply Check that there is a 12 Volt voltage present at pin 30 See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT Move on to Step 6 | Restore the wiring between the preheating control unit and the fuse box on the battery Restore the 60 A power fuse after having identified what caused it to blow. |
| 6 | Heater plugs power supply check Start the engine and check that the battery voltage arrives correctly to the individual glow plugs during the preheating stage See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT The test can be considered over | Restore the wiring between the preheating control unit and the glow heater plugs Replace the preheating control unit Op. 5520C20 HEATER PLUGS CONTROL UNIT - R.R and carry out the correct operation renewal procedure. |
PROCEDURE FOR RESTORING CORRECT OPERATION OF PREHEATING SYSTEM
Each time any of the preheating system components (preheating control unit, glow heater plugs, engine management control unit, wiring) is replaced/renewed, a complete heater plugs activation plus heater plugs warning light flashing cycle (described below) should be carried out in order to allow the error in the engine management control unit to be correctly deleted and avoid the heater plugs warning light continuing to flash in the instrument panel even if there is no fault in the preheating system.
OPERATING CYCLE:
1. Turn the ignition ON and wait until the heater plugs warning light goes out (preheating stage).
2. Start the vehicle and wait until the preheating control unit is deactivated (the heater plugs warning light should be off during this stage)
3. If there is a fault in the preheating system, the heater plugs warning light should start flashing for 30 seconds.
4. At the end of this stage, turn the ignition OFF and repeat the starting process.
5. If at the end of the activation of the preheating control unit, the heater plugs warning light no longer flashes (defect no longer present), delete the error from the memory using the Examiner.
Glow heater plugs control unit
| Component | Pin |
|---|---|
| Glow heater plug 1 - | G1 |
| Glow heater plug 2 - | G2 |
| Glow heater plug 3 - | G3 |
| Glow heater plug 4 - | G4 |
| N.C. | G5 |
| Earth | 31 |
| Preheating control unit control | K |
| + 15 Supply | 86 |
| N.C. | ST |
| Feedback signal | Di |
| Power supply | +30 Batt (Threaded pin) |
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