Connect Test Box to Wiring Harness of Engine Control Module (ECM) For Wiring and Component Test

Connect Test Box To Wiring Harness Of Engine Control Module (ECM) For Wiring And Component Test

Recommended special tools and equipment







- VAG1598/31 test box

Work procedure
- Switch ignition off.
- Remove rubber seal from plenum chamber cover.







- Remove plenum chamber cover -1- toward front (arrows).







- Pry off both covers -3- using a screwdriver.
- Loosen hex-nuts -4- by several turns.
- Loosen wiper arm -2- from wiper axle by lightly tilting.
- Remove hex nuts completely and remove wiper arms.
- Disconnect securing clips -1- and remove cowl grill -5-.







- Remove cover for E-box, plenum chamber (arrows).







- Using a screwdriver, pry off retaining bracket (arrow).







- Disengage connector catches (arrows) and disconnect harness connectors -1- and -2- from Engine Control Module (ECM).

NOTE: Adaptation values are erased when connector is disconnected from the Engine Control Module (ECM), DTC memory content remains intact.







- Connect e.g. VAG1598/31 test box to connectors of wiring harness. Connect Ground (GND) clip at test box (not visible in illustration) to Ground (GND). Relevant test procedures note whether Engine Control Module (ECM) should be connected to the test box.

CAUTION: To avoid damaging electronic components, set measuring range before connecting test leads and observe all test requirements.

Assembling
Assembly is performed in reverse order of removal. Note the following:

Final procedures
After connecting harness connectors to Engine Control Module (ECM), the following work steps must be performed in the mentioned sequence:
1. Check DTC memory. Diagnostic Mode 03 - Read DTC Memory
2. If necessary, erase DTC memory. Diagnostic Mode 04 - Erase DTC Memory
3. If DTC memory was erased, generate readiness code.

- End diagnosis and switch ignition off.