Check operation of main engine control unit relay

Make: Alfa Romeo
Model: 159 Factory Service Manual
Year: 2005–2011
Section: Diesel injection system › Check operation of main engine control unit relay

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EngineCheck operation of main engine control unit relay

CHECK OPERATION OF MAIN ENGINE CONTROL UNIT RELAY

Check 1060GL

1.9 JTD 8V, 1.9 JTD 16V, 2.4 JTD 20V

STEP	CHECK TO BE PERFORMED	RESOLUTION IF THE CHECK IS NOT OK
1	Press the START/STOP button and turn off the engine. In the engine compartment junction unit, remove relay T9 (in the middle of the lower row) Press the START/STOP button. Measure the voltage between Pin 85 of the base unit for relay T9 and the earth, ensuring it is less than 0.3 V. Move on to Step 4	Move on to Step 2
2	If faults are found, restore the wiring between the engine compartment junction unit and the engine compartment junction unit See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT Replace the wiring if necessary The test can be considered over	Replace the junction unit Op. 5505A13 ADDITIONAL JUNCTION UNIT IN ENGINE COMPARTMENT - R.R. and move on to Step 3
3	Check the fault disappears. The test can be considered over	Repair the original junction unit and replace the engine management control unit Op. 1060G80 DIESEL ELECTRONIC INJECTION CONTROL UNIT - .R
4	Measure the voltage between Pin 87 of the base unit for relay T9 and the earth, ensuring it is less than 1.0 V. Move on to Step 15	Move on to Step 5
5	Press the START/STOP button. Disconnect the cable loom connector from the engine management control unit connector A. Press the START/STOP button. Measure the voltage between Pin 87 of the base unit for relay T9 and the earth, ensuring it is greater than 1.0 V.	Replace the engine management control unit Op. 1060G80 DIESEL ELECTRONIC INJECTION CONTROL UNIT - .R
6	Press the START/STOP button. Disconnect the wiring harness connector from the EGR solenoid Press the START/STOP button. Measure the voltage between Pin 87 of the base unit for relay T9 and the earth, ensuring it is greater than 1.0 V.	Replace the EGR solenoid valve Op. 1080C24 E.G.R. SYSTEM SOLENOID - R + R
7	Press the START/STOP button. Disconnect the cable loom connector from the flow modifying solenoid valve. Press the START/STOP button. Measure the voltage between Pin 87 of the base unit for relay T9 and the earth, ensuring it is greater than 1.0 V.	Replace the solenoid valve Op. 1064A34 TURBOCHARGER PRESSURE ADJUSTMENT VALVE - R.R.
8	Press the START/STOP button. Disconnect the wiring harness connector from the built-in throttle body actuator. Press the START/STOP button. Measure the voltage between Pin 87 of the base unit for relay T9 and the earth, ensuring it is greater than 1.0 V.	Replace the built-in throttle body actuator Op. 1060G50 THROTTLE BODY - R.R
9	Press the START/STOP button. Disconnect the wiring harness connector from the accelerator pedal potentiometer Press the START/STOP button. Measure the voltage between Pin 87 of the base unit for relay T9 and the earth, ensuring it is greater than 1.0 V.	Replace the accelerator pedal Op. 1068A20 ACCELERATOR PEDAL WITH BUILT-IN POTENTIOMETER - R.R
10	Press the START/STOP button. Disconnect the wiring harness connector from the brake pedal switch. Press the START/STOP button. Measure the voltage between Pin 87 of the base unit for relay T9 and the earth, ensuring it is greater than 1.0 V.	Replace the brake pedal switch Op. 5550D10 BRAKE LIGHT SWITCH - R+R
11	Press the START/STOP button. Disconnect the battery positive Press the START/STOP button. Measure the voltage between Pin 87 of the base unit for relay T9 and the earth, ensuring it is less than 1.0 V.	Move on to Step 14
12	If faults are present, restore the wiring between the battery positive and the turbine variable geometry control solenoid See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT Replace the wiring if necessary The test can be considered over	Replace the solenoid valve Op. 1064B42 SOLENOID CONTROLLING TURBOCHARGER VANE POSITION ACTUATOR - R.R
13	If faults are present, restore the wiring between the various disconnected components See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT Replace the wiring if necessary The test can be considered over	Replace the junction unit Op. 5505A13 ADDITIONAL JUNCTION UNIT IN ENGINE COMPARTMENT - R.R.
14	Press the START/STOP button. Disconnect the cable loom connector from the engine management control unit connector A. Check the resistance between Pin 85 of the base unit for relay T9 and the earth is greater than 500 kOhms. Move on to Step 16	Move on to Step 15
15	If faults are found, restore the wiring between the engine compartment junction unit and the engine compartment junction unit See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT Replace the wiring if necessary The test can be considered over	Replace the junction unit Op. 5505A13 ADDITIONAL JUNCTION UNIT IN ENGINE COMPARTMENT - R.R.
16	Check that the resistance across Pin 85 of the base of relay T9 and Pin 72 of control unit connector A See M010 ENGINE MANAGEMENT ECU is greater than 5 Ohms. Move on to Step 15	Replace the engine management control unit Op. 1060G80 DIESEL ELECTRONIC INJECTION CONTROL UNIT - .R

STEP

CHECK TO BE PERFORMED

RESOLUTION IF THE CHECK IS NOT OK

Press the START/STOP button and turn off the engine.

In the engine compartment junction unit, remove relay T9 (in the middle of the lower row)

Press the START/STOP button.

Measure the voltage between Pin 85 of the base unit for relay T9 and the earth, ensuring it is less than 0.3 V.

Move on to Step 4

Move on to Step 2

If faults are found, restore the wiring between the engine compartment junction unit and the engine compartment junction unit

See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT

Replace the wiring if necessary

The test can be considered over

Replace the junction unit

Op. 5505A13 ADDITIONAL JUNCTION UNIT IN ENGINE COMPARTMENT - R.R.

and move on to Step 3

Check the fault disappears.

The test can be considered over

Repair the original junction unit and replace the engine management control unit

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

Measure the voltage between Pin 87 of the base unit for relay T9 and the earth, ensuring it is less than 1.0 V.

Move on to Step 15

Move on to Step 5

Press the START/STOP button.

Disconnect the cable loom connector from the engine management control unit connector A.

Press the START/STOP button.