Impact Sensor: Testing and Inspection

Crash signal, checking

If an accident occurred which lead to the activation of the seat belt tensioner/airbag, the engine control module shuts off the activation of fuel pump relay. Therefore, excessive fuel delivery is prevented is case the fuel system is damaged.

As long as the malfunction "Crash shut-down activated" is stored or not erased in the engine control module, the fuel pump will not prime the system (pre-run) when the ignition key is turned on and the fuel system will not be pressurized. Therefore, it is possible that the engine starts with a delay.

- Connect VAG1598/31 test box to wiring harness for engine control module. Do not connect to the engine control module itself. Refer to "Scan Tool Testing/Scan Tool Connecting and Initial Checks/Connecting VAG1598/31 Test Box" under "Powertrain Management" Testing and Inspection

Test the following wiring connections for open circuit and/or short to B+ or Ground (GND) and open circuit.

VAG1598/31 test box, socket Airbag control module, contact
67 -

Resistance in wiring: max. 1.5 ohm

Eliminate open circuit or short circuit.

If no malfunctions are found in wiring: Check DTC memory of airbag control module.
- Display readiness code. The readiness code must be generated if the DTC memory was erased.
Refer to "Monitors, Trips and/or Drive Cycle (Readiness Codes)/Readiness Code" under "Powertrain Management" Testing and Inspection
Refer to "Monitors, Trips and/or Drive Cycle (Readiness Codes)/Generating Readiness Code" under "Powertrain Management" Testing and Inspection