Vauxhall Workshop Service and Repair Manuals

No.

TECH 1 Display

Conditions for Checking

Nominal Value

Trouble Codes

Terminal

33

IAC INTEGRATO R

Engine running at idle speed, operating temperature

Switch off all consumers

56, 57

4, 24

20 SE engine

120 to 135 steps

X 20 SE engine

120 to 135 steps

Note:

The IAC INTEGRATOR indicates the opening tendency (observance of the pulse duty ratio necessary for nominal engine speed) of the idle speed adjuster.

This means:

Values greater than 128 steps mean larger,

values less than 128 steps mean smaller opening cross - sections of the idle speed adjuster.

The IAC INTEGRATOR requires the following information for regulation:

-      ENGINE SPEED (inductive pulse pick - up)

-      Throttle valve closed (via TPS SIGNAL)

-      COOLANT TEMP.

Important:

If there is a malfunction in the idle speed adjuster wiring harness plug, mech. emergency operation is activated.

This increases the idle speed to 1 000 to 1400 rpm.

Notes on Trouble - shooting:

Nominal Value:

Cause of Fault:

·  See Table F5: ACTUATOR TEST, test step 04

·   See Table F8: ECU CONTROL, test step 02

·   Compare nominal values from

  IAC INTEGRATOR

  IAC BLOCK LEARN

     with each other

IAC INTEGRATOR

             20 SE 120 to 135 steps

         X 20 SE 120 to 135 steps

IAC BLOCK LEARN

             20 SE 124 to 135 steps

         X 20 SE 124 to 135 steps

·     Lack of air

-    Idle speed adjuster jams

-    Bypass air hose blocked or kinked

-    Air cleaner dirty

-    Intake system blocked

·     Excessive air

- Idle speed adjuster jams

-    Throttle valve open (accelerator cable or throttle valve jams)

-    Intake system leaky

·   Idle speed adjuster M 33 defective

·   Coolant temperature sensor P 12 defective

·   Throttle valve potentiometer P 34 defective

·   Inductive pulse pick - up P 35 defective

·   Mass air flow meter P 44 defective

·   Mixture too rich (see table F0:DATA LIST, test step 39)

·   Control unit K 61 defective