Secondary Air Injection (AIR) Pump Relay J299, Checking

Special tools, testers and auxiliary items required 

• Multimeter.
• Wiring diagram.

Test requirements 

• Fuse S131 OK.
• Fuse S234 OK.
• Fuel Pump (FP) Relay J17 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.

Test procedure 

• Perform a preliminary check to verify the customers complaint. Refer to → Preliminary Check .

Start diagnosis 

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

Checking voltage 

• Using a Multimeter, check the Secondary Air Injection (AIR) Pump Relay J299 socket 8/87 to Ground (GND).

Specified value: battery voltage.

If the specified value was not obtained:

• Check the Secondary Air Injection (AIR) Pump Relay J299 socket 8/87 to Battery A (+) for an open circuit or a short circuit.
• Check the electrical harness connector for damage, corrosion, loose or broken terminals.
• If necessary, repair the faulty wiring connection.

If the specified value was obtained:

• Switch the ignition on.
• Using a Multimeter, check the Secondary Air Injection (AIR) Pump Relay J299 socket 2/30 to Ground (GND) for voltage.

Specified value: battery voltage.

• Switch the ignition off.

If the specified value was not obtained:

• Check the Secondary Air Injection (AIR) Pump Relay J299 socket 4/86 to the Fuel Pump (FP) Relay J17 socket 2 for an open circuit or a short circuit.
• Check the electrical harness connector for damage, corrosion, loose 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 VAG1598/31. Refer to 24 MULTIPORT FUEL INJECTION (MFI) .

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

• Remove the Motronic Engine Control Module (ECM) J220. Refer to → Motronic Engine Control Module (ECM) J220, Replacing .
• Using a Multimeter, check the Secondary Air Injection (AIR) Pump Relay J299 socket 6/T to the Motronic Engine Control Module (ECM) J220 electrical harness connector terminal 46 for resistance.

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, loose 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.
• Erase the DTC memory. Refer to → Diagnostic Mode 04 - Reset/Delete Diagnostic Data
• Perform a road test to verify repair.

If the DTC does not return:

Repair complete, Generate readiness code. Refer to → Readiness Code Description .

• End diagnosis.

If the DTC does return and no malfunction is detected in the wiring and the voltage supply was OK:

• Replace the Motronic Engine Control Module (ECM) J220. Refer to → Motronic Engine Control Module (ECM) J220, Replacing .
• Assembly is performed in the reverse of the removal.

Final procedures 

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

1. Check the DTC memory.
2. If necessary, erase the DTC memory. Refer to Diagnostic Mode 04 - Reset/Delete Diagnostic Data .
3. If the DTC memory was erased, generate readiness code. Refer to Readiness Code Description .

End of diagnosis.