Vauxhall Workshop Service and Repair Manuals

No.

TECH 1 Display

Conditions for Checking

Nominal Value

Trouble Codes

Terminal

09

MASS AIR FLOW S.

Engine running at idle speed, operating temperature

Switch off all consumers      C 18 XE

                                             X 20 XEV

7 to 17 kg / h

0.25 to 0.67 V

9 to 19 kg / h

0.3 to 0.7 V

73, 74

27, 8, 37

Note:    TECH 1 checks the signal voltage from mass air flow meter P44 to Ter. 27 of control unit K69. If trouble code 73 or 74 is set, the engine runs using a replacement mass air flow meter value, which is however not displayed by TECH 1.

Notes on Trouble - shooting:

Nominal Value:

Cause of Fault:

·     Disconnect plug from mass air flow meter P44.

       Ignition On. Using multimeter, measure voltage at plug between Ter. 3 and Ter. 1

greater than 11.5 V

·     Astra - F, Vectra / Cavalier, Calibre:

       Interruption or short circuit to ground from fuel pump relay K68 / Ter. 8 (Ter. 87) to mass air flow meter Ter. 3

       Omega - B

       Interruption or short circuit to ground from reverse battery protection relay K42 / Ter. 8 (Ter. 87) to mass air flow meter Ter. 3

·     Interruption in ground lead to mass air flow meter Ter. 1

·     Reconnect plug for mass air flow meter.

       Engine running at idle speed

C 18 XE:

7 to 17 kg / h

0.25 to 0.67 V

or

X 20 XEV:

9 to 19 kg / h

0.3 to 0.7 V

TECH 1 display constantly less than or equal to 0.17 V:

·     Short circuit to ground or lead interruption from control unit Ter. 27 to mass air flow meter Ter. 2

·     Short circuit of signal lead for mass air flow meter Ter. 2 / control unit Ter. 27 to ground lead for mass air flow meter Ter. 4 / control unit Ter. 8

·     Mass air flow meter P44 defective

TECH 1 display constantly greater than or equal to 4.5 V:

·     Astra - F, Vectra / Cavalier, Calibre:

       Short circuit of signal lead for mass air flow meter Ter. 2 / control unit Ter. 27 to lead for mass air flow meter Ter. 3 / fuel pump relay Ter. 8 (Ter. 87), + battery voltage

       Omega - B:

       Short circuit of signal lead for mass air flow meter Ter. 2 / control unit Ter. 27 to lead for mass air flow meter Ter. 3 / reverse battery protection relay K42 / Ter. 8 (Ter. 87), + battery voltage

·     Mass air flow meter P44 defective

·     Control unit K69 defective