Engine Controls - Tests W/codes: Diagnosis Volkswagen Passat B4

ENTERING SELF-DIAGNOSTICS

1. Ensure battery voltage and fuses No. 18 and 22 are okay. Ensure engine ground connections at cylinder head cover and manifold are okay.
2. Connect Scan Tester (VAG 1551) to Data Link Connectors (DLC) located in center console, in front of shift lever. (Схема №1)Attach Black connector first, wait for VAG ON-BOARD DIAGNOSTIC message, then connect White connector. DO NOT connect Blue connector.
3. Turn ignition on, or start engine, depending on function being selected. See appropriate «SELECTABLE FUNCTIONS»(ref-14546-S12623880072000122600000) table. Press "1" button to select RAPID DATA TRANSFER function.
4. Press "0" and "1" buttons to select ENGINE ELECTRONICS function. Press "Q" button to enter input. Electronic Control Module (ECM) identification will be displayed on scan tester.
5. If CONTROL MODULE DOES NOT ANSWER message is displayed, press HELP button to print a list of possible causes. With scan tester in RAPID DATA TRANSFER function, press right arrow button. Press "02" to "08" buttons to select desired function. Press "Q" button to enter input.

SELECTABLE FUNCTIONS (1)

OUTPUT CHECK DIAGNOSIS (OUTPUT DIAGNOSTIC TEST MODE)

Note. See ENTERING SELF-DIAGNOSTICS for additional scan tester operating instructions.

1. Connect Scan Tester (VAG 1551) to Data Link Connectors (DLC) located in center console, in front of shift lever. With scan tester in OUTPUT DIAGNOSTIC TEST MODE, the injectors, Idle Air Control (IAC) valve, evaporative frequency (solenoid) valve, oxygen sensor relay, and EGR frequency valve (if equipped) may be actuated in sequence listed.
2. The injector(s) must click by opening and closing throttle. To trigger injectors 2 through 6, open and close throttle once for each injector. If injector(s) does not click, test circuit(s) using the «PIN VOLTAGE CHARTS»(ref-14588) article.
3. If injectors are okay, switch to next output test by pressing right arrow button. Press right arrow button to actuate IAC valve. IAC valve must pulsate noticeably until switched to next output test by pressing right arrow button.
4. If IAC valve does not pulsate, turn ignition off. Disconnect IAC valve, and connect LED Tester (US 1115) to IAC valve wiring harness connector using jumper wires from Adapter Kit (VW 1594).
5. Turn ignition on and repeat IAC valve output test. If LED blinks, replace IAC valve. If LED does not blink, test circuit using the J - PIN VOLTAGE CHARTS article. If IAC and circuit are okay, replace ECM.
6. If IAC valve pulsates properly, locate evaporative frequency solenoid valve (located behind air cleaner housing, on wheel well). Disconnect hose, coming from fuel vapor canister, from frequency solenoid. Attach auxiliary hose to solenoid.
7. Blow into auxiliary hose, in direction of throttle housing, while performing solenoid output test (press right arrow button to actuate evaporative frequency solenoid). If solenoid does not actuate (open and close), disconnect wiring harness from solenoid. Connect LED tester to solenoid wiring harness connector using jumper wires from adapter kit.
8. Repeat evaporative solenoid valve output test. If LED blinks, replace evaporative frequency solenoid valve. If LED does not blink, test circuit using the J - PIN VOLTAGE CHARTS article. If evaporative solenoid valve and circuit are okay, replace ECM.
9. If evaporative frequency solenoid operates properly, press right arrow button to actuate oxygen sensor relay (mounted on fuse/relay panel with a clip). If relay does not click, test relay and its circuit using the «PIN VOLTAGE CHARTS»(ref-14588) article.
10. If relay operates properly, press right arrow button to actuate EGR frequency valve. Frequency valve must click until test mode is switched to next output test by pressing right arrow button.
11. If frequency valve does not click, disconnect valve. Connect LED tester, using jumper wires from Adapter Kit (VAG 1594), to frequency valve wiring harness connector.
12. If LED blinks, replace EGR frequency valve. If LED does not blink, test circuit using the J - PIN VOLTAGE CHARTS article. If EGR frequency valve and circuit are okay, replace ECM.
13. If EGR frequency valve operates properly, press right arrow button twice to select END OUTPUT function on scan tester. Press "Q" to enter input. Turn ignition off. Disconnect scan tester.

READ MEASUREMENT & READ MEASURING (TEST) VALUE BLOCK

Note. See ENTERING SELF-DIAGNOSTICS for additional scan tester operating instructions.

1. Connect Scan Tester (VAG 1551) to Data Link Connectors (DLC) located in center console, in front of shift lever. With scan tester in READ MEASURING VALUE BLOCK function, press "01" to "06" buttons to select desired display group. See the «DISPLAY GROUP»(ref-14546-S21800523952000122600000) table.
2. When display group is selected, only second digit is shown on display (the zero does not appear on display). When READ MEASURING VALUE BLOCK function is completed, select END OUTPUT function on scan tester. Turn ignition off. Disconnect scan tester.

DISPLAY GROUP