Vauxhall Workshop Service and Repair Manuals

No.

TECH 1 Display

Conditions for Checking

Nominal Value

Trouble Codes

Terminal

28

IAC CNTR. ENABLE

Ignition ON

Engine cold

Engine running at idle speed, operating temperature

Engine throttle valve CLOSED (accelerator pedal in idle position)

Engine running in partial load range, operating temperature

INACTIVE

ACTIVE

INACTIVE

-

-

IAC CNTR. ENABLE is an internal value of the control unit.

All consumers switched off                                                      ?

COOLANT TEMP.             (P 30)                                 OK    ?        (test step 03)

INTAKE AIR TEMP.          (P 29)                                 OK    ?        (test step 04)

O2 SENSOR LOOP            closed                                OK    ?        (test step 17)

O2 INTEGRATOR                                                         OK    ?        (test step 19)

O2 BLM CELL NO.                                                     OK    ?        (test step 21)

O2 BLM CELL CONT                                                 OK    ?        (test step 22)

PARK/NEUTRAL SW.       in idle position (P-N)         OK    ?        (test step 09)

TPS SIGNAL                       (P 34)                                 OK    ?        (test step 06)

MAP SENSOR                    (P 23)                                 OK    ?        (test step 05)

IDLE AIR CONTROL        (M 66)                               OK    ?        (test step 15)

If all the above checking points are OK:                               disconnect the control unit from the vehicle electrical system (reset), repeat check

Trouble-shooting:

Nominal Value:

Cause of Fault:

(If nominal value is not attained)

·   If all of the above data list parameters are OK and the engine is running normally, a deviation in this test step can be ignored

Data list parameters OK

·   Control unit defective