Vauxhall Workshop Service and Repair Manuals

No.

TECH 1 Display

Conditions for Checking

Nominal Value

Trouble Codes

Terminal

43

KNOCK RETARD

Engine running at idle speed, operating temperature

0 °CA

Depress accierator pedal briefly to full load stop (full throttle)

Note:

This test will only function if the accelerator pedal is depressed briefly to full load stop once, not several times in a row

.

greater than 0 °CA

Note:

Test step 43 displays the ignition retard in the event of knocking      combustion.

In these cases, a statement can be made about:

                                                                                                                         Possible remedies:

·   Poor fuel quality (octane rating too low):                                                   ·     Change fuel brand

·   Carbon deposits (deposits on piston head and valves):                              ·     Check compression

·   Extreme short distance operation (cause of carbon deposits)

The knock control is monitored / checked by the control unit self - diagnosis and can only be simulated in operation under extreme conditions and with some difficulty.

On fault recognition, the control unit retards the firing angle by 1 0 OCA for reasons of safety to avoid damage to the engine.

Notes on Trouble - shooting:

Nominal Value:

Cause of Fault:

·     See test step 08