Vauxhall Workshop Service and Repair Manuals

Test	TECH 1	Notes	Nominal Values	Possible
Step	Display			Trouble
No.				Codes
28	PHASE SENSOR	Ignition ON	INACTIVE       5 V
				93, 94
		Engine at idle speed	Slow change
		(operating temperature)	in display from
			INACTIVE       5 V to
			ACTIVE            0 V
			and vice versa

 

 

Note:

The Hall sensor on the high tension distributor helps recognition of cylinders. It informs the control unit at which crankshaft revolution cylinder "1" ignites. The control unit needs this information to inject the fuel at the correct time.

The Hall sensor is only included in the self-diagnosis on vehicles as of Model Year '89.

If there is a failure in the Hall sensor, the control unit picks a random point in time for injection valve actuation.

Effects from failure of Hall sensor:

· On open loop systems, worse exhaust emissions

· Cold start problems

 

Trouble-shooting:                                 Nominal Value:                       Cause of Fault:

 

Check voltage supply                                                                                                          · Lead interruption between

· Connect multimeter to Ter. 3 (brgr)                                                                                  control unit Ter. 31 (voltage supply)

of Hall sensor                                                                                                                        and Hall sensor Ter. 3

and measure against ground

(adapter cable from KM-609)                                                                                           · Control unit defective

· Ignition ON                                                         > 10 V

· Ignition OFF

Check ground

· Connect multimeter between                           0 Ohm                                                   · Lead interruption between

control unit Ter. 8 and                                                                                                         control unit Ter. 8 and

Hall sensor Ter. 2                                                                                                                 Hall sensor Ter. 2 (signal lead)

 

Check Hall sensor:

 

· Push back rubber grommet

on 3 pin plug from Hall sensor

and install plug

 

Connect measuring tips of

Multimeter MKM-587-A to signal

lead (Ter. 2, middle contact)

and ground (Ter. 1)

 

 

· Ignition ON

 

Push vehicle with gear                                      Display must change

engaged                                                               between 5 V and 0 V                          · Hall sensor defective