Vauxhall Workshop Service and Repair Manuals

Test	TECH 1	Notes	Nominal Values	Possible
Step	Display			Trouble
No.				Codes
05	MASS AIR FLOW S.	Engine at idle speed	10      to      13 kg/h
			1.9     to      2.25 V	73, 74

 

 

Trouble-shooting:                                 Nominal Value:                       Cause of Fault:

(If nominal value is not attained)

 

Test values of mass air flow sensor hot-wire using Multimeter KM-587-A:

 

· Remove mass air flow

sensor plug

Adapt multimeter to mass air

flow sensor via adapter cable from

Electronic Kit KM-609

 

Measurement between Ter. 1 (ground) and Ter. 2 (mass air flow sensor ground):                   0 Ohm

Measurement between Ter. 2 (ground) and Ter. 3 (signal lead)                              :                    2.5 to 3.1 Ohm

Measurement between Ter. 2 (ground) and Ter. 6 (idle CO potentiometer signal lead):

0 to   30 Ohm (left stop)

900 to 1100 Ohm (right stop)

 

Checking Burn-off Operations (Visual Inspection)

 

Disconnect hose clamp on intake side

and remove bracket.

Engine running at a speed of more

than 1000 1/min for 10 seconds.

Switch off engine and remove

intake hose

After a 4 second pause, hot-wire

heats up for approx. 1.5 seconds

(glows red)

 

· Lead interruptions

between relay Ter. 87 (+) and MAF Ter. 5 (+) or

between relay Ter. 85 (-) and control unit Ter. 36 (-),

between control unit Ter. 25 (signal) and MAF/Ter. 4,

between MAF/Ter. 1 and ground

 

· MAF defective

 

· Fuel pump relay defective

 

· Control unit defective

 

Explanation:

During the burn-off operation, voltage is switched from the control unit.

 

 

MAF = Hot-wire, mass air flow sensor