Secondary Air Injection Pump Relay, Checking

Special tools and workshop equipment required 

• Multimeter.
• Wiring diagram.

Test requirements 

• Fuse -S130- OK.
• The Engine Component Power Supply Relay -J757- OK.
• Battery voltage at least 12.5 V.
• All electrical consumers switched off (radiator fan must NOT run during test).
• A/C switched off.
• The ignition switched off.

Procedure 

-- Remove the Secondary Air Injection (AIR) Pump Relay --J299--.

Checking voltage

-- Using a Multimeter, check the Secondary Air Injection (AIR) Pump Relay --J299-- socket 2/30 to Ground (GND).

Specified value: battery voltage.

If the specified value was not obtained:

-- Check the wiring connection from the battery to the Secondary Air Injection (AIR) Pump Relay --J299-- socket 2/30 for an open circuit or a short circuit.

-- Check the wiring connections for damage, corrosion, lose or broken terminals.

-- If necessary, repair the faulty wiring connection.

If the specified value was obtained:

-- Crank the engine.

-- Using a Multimeter, check the Secondary Air Injection (AIR) Pump Relay --J299-- socket 6/86 to Ground (GND).

Specified value: battery voltage.

-- Switch the ignition off.

If the specified value was not obtained:

-- Check the wiring connection from the Engine Component Power Supply Relay -J757- socket 2/87 to the Secondary Air Injection (AIR) Pump Relay --J299-- socket 6/86 for an open circuit or a short circuit.

-- Check the wiring connections for damage, corrosion, lose or broken terminals.

-- If necessary, repair the faulty wiring connection.

If the specified value was obtained:

Checking wiring

If the manufacturers test box is being used. Perform the following step.

-- Install the test box. Refer to Wiring and Components, Checking with Test Box VAG 1598/42 (test box) at Engine Control Module.

If the manufacturers test box is not being used. Perform the following step.

-- Remove the Motronic Engine Control Module (ECM) -J623-. Refer to ENGINE CONTROL MODULE, REMOVING AND INSTALLING .

-- Using a Multimeter, check the Secondary Air Injection (AIR) Pump Relay --J299-- socket 4/85 to the Motronic Engine Control Module (ECM) -J623- electrical harness connector T94a terminal 49 for resistance.

Secondary Air Injection (AIR) Pump Relay --J299-- socket terminal	Motronic Engine Control Module (ECM) -J623- electrical connector T94a terminal or test box socket
4/85	49

Specified value: 1.5 Ω Max.

If the specification was not obtained:

-- Check the wiring for a short circuit to each other, Battery (+), and Ground (GND).

-- Check the electrical harness connector for damage, corrosion, lose or broken terminals.

-- If necessary, repair the faulty wiring connection.

If no malfunction is found in the wiring and voltage supply was OK:

-- Replace the Secondary Air Injection (AIR) Pump Relay --J299--. Refer to Removal and Installation .

If no malfunction is found in the wiring and voltage supply was not OK:

-- Replace the Motronic Engine Control Module (ECM) -J623-. Refer to ENGINE CONTROL MODULE, REMOVING AND INSTALLING .

Assembly is performed in the reverse order of removal.

Final procedures 

After repair work, the following work steps must be performed in the following sequence:

1. Check the DTC memory. Refer to DIAGNOSTIC MODE 03 - READ DTC MEMORY .
2. If necessary, erase the DTC memory. Refer to DIAGNOSTIC MODE 04 - ERASE DTC MEMORY .
3. If the DTC memory was erased, generate readiness code. Refer to READINESS CODE .

-- End of diagnosis.