Secondary Air Injection (AIR) Pump Relay -J299- , checking

Special tools, testers and auxiliary items required 

• Multimeter.
• Wiring diagram.

Test requirements 

• Fuse S130 OK.
• Fuse S234 OK.
• The 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.

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 8/87 to Ground (GND).

Specified value: battery voltage.

If the specified value was not obtained:

• Check the wiring connections from the Battery to the Secondary Air Injection (AIR) Pump Relay -J299- socket 8/87 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 4/86 for voltage.

Specified value: battery voltage.

• Switch the ignition off.

If the specified value was not obtained:

• Check the wiring connection from the Fuel Pump (FP) Relay J17 socket 2 to the Secondary Air Injection (AIR) Pump Relay -J299- socket 4/86 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 → 24 MULTIPORT FUEL INJECTION (MFI) (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) 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 66 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, 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 → 26 - EXHAUST SYSTEM, EMISSION CONTROLS .

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

• Replace the Motronic Engine Control Module (ECM) J220. Refer to → Motronic Engine Control Module (ECM) J220 , replacing  .

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 .

• End of diagnosis.