Checking Wiring & Connections-To-Pressure Sensor

NOTE: ECM remains disconnected.

Connect (VAG 1598) test box to Engine Control Module (ECM) wiring harness using (VAG 1598/5) adapter cable. See CONNECTING VAG 1598 TEST BOX .
Using wiring diagram, check following circuits for continuity or shorts, by testing at terminals indicated in table. See IDENTIFYING PRESSURE SENSOR HARNESS CONNECTOR TERMINAL & VAG 1598 SOCKET NUMBER table. See Figure. Also, see WIRING DIAGRAMS .

NOTE: Use only gold replacement terminals when making repairs to sensor connectors.

Repair open or short circuits as necessary. See WIRING DIAGRAMS .
Connect (VAG 1598/5) adapter cable to ECM. Switch ignition ON.
Connect DVOM, switched to voltage range, in turn between:
- Terminals No. 12 and 30.
- Terminals No. 9 and 30.
Must be 4.5-5.5 volts, each time.
If NO (one or both specified values NOT obtained): Replace ECM. After replacement of ECM, see ECM IDENTIFICATION and ECM CODING under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS article.

IDENTIFYING PRESSURE SENSOR HARNESS CONNECTOR TERMINAL & (VAG 1598) SOCKET NUMBER

Pressure Sensor Terminal No ⁽¹⁾

VAG 1598 Socket No.

⁽¹⁾	Resistance must be 1.0 ohm maximum.