TB. MFI #2 / DI #7 Idle switch status varies

TB. MFI#2 / DI#7 (MFI LH 2.4)

MFI#2 / DI#7 Idle switch status varies




Fault message conditions:
If both MFI and ICM are connected the fault message will be logged if the voltage at the terminals is different - is not over or under 1.2 V at the same time.

Fault causes:
Break in the wiring between the TP switch and MFI#2.
Break in the wiring between the TP switch and DI#7.

Fault symptoms:
Wrong idle speed.
No fuel shut-off when the engine is braking the car.

Note: When checking wiring, the ST should be disconnected in accordance with QA2. QA. Connecting The Volvo Scan Tool (ST)

TB1




Monitor Test
- Start the engine without touching the AP.
- Check to see if IDLING is displayed in Monitor Test.

If IDLING Is displayed:
^ Volvo ST, Test box TB2.

If IDLING Is not displayed:
^ Check the wiring between MFI#2 and the TP switch for breaks in accordance with NA2. NA. Checking the Wiring

TB2




Volvo ST, Test box
- Disconnect the ST in accordance with QA2. QA. Connecting The Volvo Scan Tool (ST)
- Connect the test box to DI and check the GND points in accordance with P3-P4. P. Test Box, Signal Description
^ Continue with Checking Idling signal to DI TB3.

TB3




Checking idling signal to DI
- Connect the DI control module to the test box.
- Install the fuse.
- Ignition on.
Connect a voltmeter between DI#7 and DI#20.
The voltmeter should read approx. 0 V.

- Turn the throttle pulley so that the idle switch opens.
The voltmeter should read approx. 12 V.

If this reading is OK:
^ Check the connections between DI#7 and the TP switch for loose contacts in accordance with NA5. NA. Checking the Wiring
^ Check the connections between MFI#2 and the TP switch for loose contacts in accordance with NA5. NA. Checking the Wiring

If the reading is incorrect:
^ Check the wiring between DI#7 and the TP switch for breaks in accordance with NA2. NA. Checking the Wiring