Secondary Air Injection Pump Relay, Checking

Secondary Air Injection Pump Relay, Checking

Special tools, testers and auxiliary items required

• Multimeter.

• Wiring diagram.

Test requirements

• Fuse Strip (S88) OK.

• 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.

Test procedure

- Perform a preliminary check to verify the customers complaint. Refer to => [ General Diagnosis ] General Diagnosis.

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 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 Fuel Injection and Ignition Repair Information (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 1, Removing and Installing ] Engine Control Module 1, Removing and Installing.

- Using a Multimeter, check the Secondary Air Injection (AIR) Pump Relay (-J299-) socket 4/T to the Motronic Engine Control Module (ECM) (J623) electrical harness connector T94 terminal 49 for resistance.





Specified value: 1.5 ohms 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 Engine Mechanical Repair Information.

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 1, Removing and Installing ] Engine Control Module 1, Removing and Installing.

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 ] Diagnostic Mode 03 - Read DTC Memory.

2. If necessary, erase the DTC memory. Refer to => [ Diagnostic Mode 04 - Erase DTC Memory ] Diagnostic Mode 04 - Erase DTC Memory.

3. If the DTC memory was erased, generate readiness code. Refer to => [ Readiness Code ] Monitors, Trips, Drive Cycles and Readiness Codes.

- End of diagnosis.