Output Diagnostic Test Mode: EuroVan
- Connect Scan Tester (VAG 1551) to Data Link Connectors (DLC). DLCs are located in fold-down storage shelf, in front of relay panel. With scan tester in OUTPUT DIAGNOSTIC TEST MODE, fuel pump relay, Idle Air Control (IAC) valve, and evaporative frequency (solenoid) valve may be actuated.
- Press right arrow button to actuate fuel pump relay. Relay must click until test mode is switched to next output test by pressing right arrow button. When actuating fuel pump relay, fuel pump must also be running. If fuel pump relay does not actuate, test circuit using PIN VOLTAGE CHARTS
article in the ENGINE PERFORMANCE.
- If fuel pump relay operates properly, press right arrow button to actuate IAC valve. IAC valve must click until test mode is switched to next output test by pressing right arrow button.
- If IAC valve does not actuate, connect Test Harness (VAG 1501) between IAC valve and wiring harness connector. See Fig 1
. Connect LED Tester (US 1115) between terminals No. 1 and 3 using jumper wires from Adapter Kit (VW 1594).
- If LED tester blinks, replace IAC valve. If LED does not blink, test circuit using PIN VOLTAGE CHARTS
article in the ENGINE PERFORMANCE. If IAC valve and circuit are okay, replace ECM.
- If IAC valve operates properly, press right arrow button to actuate evaporative frequency (solenoid) valve. If valve does not actuate, disconnect wiring harness connector from valve.
- Connect LED tester between wiring harness connector terminals. If LED blinks, replace evaporative frequency (solenoid) valve. If LED does not blink, test circuit using PIN VOLTAGE CHARTS
article in the ENGINE PERFORMANCE. If evaporative frequency solenoid and circuit are okay, replace ECM.
- With OUTPUT DIAGNOSTIC TEST MODE completed, on scan tester press "0" and "6" buttons to select END DATA TRANSFER function. Press "Q" button to enter input. Turn ignition off. Disconnect scan tester. If ignition is not turned off before trying to re-start engine, engine will not start because injectors and ignition transformer will not be actuated.
Courtesy of VOLKSWAGEN UNITED STATES, INC.