Golf GTI L4-1984cc 2.0L DOHC (9A) (1990)
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Connect engine tester VAG 1367, using inductive pickup VAG 1367/8.
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Connect CO tester SUN 105 (or EPA approved equivalent), using adaptor hose VAG 1363/3 on CO tap tube.
Note
Adaptor must be connected tightly to CO tap tube to prevent measuring errors.
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Start engine and let idle.
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Go to engine scan tool and press 1 button to select "Rapid Data Transfer" mode.
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Press 0 and 1 buttons to select "Engine Electronics".
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Press Q button to enter input.
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Press (arrow) button.
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Press 0 and 4 buttons to select "Engine Basic Adjustment" function.
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Press Q button to enter input.
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display will appear as shown
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Press Q button twice to display "Group 09".
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display will appear as shown
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Press Q button to enter input.
Note
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The display channel values are in decimal form.
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2000 is the maximum number of RPM that can be displayed in this setting.
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When this function is selected, the Idle Air Control (IAC) Valve is switched OFF and the EVAP Canister Purge Solenoid Valve is CLOSED
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Observe channel 9 of display.
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display value must be 5
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If value other than 5 is displayed
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Check if A/C is switched OFF
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Check "Closed Throttle Position (CTP) switch.
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Check ignition timing.
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check value must be 4 to 8 BTDC
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If NO
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Adjust ignition timing by loosening ignition distributor and turning it until adjustment is correct.