Air Injection Pump Relay: Testing and Inspection

Diagnostic Procedures

Secondary Air Injection Pump Relay, Checking

Special tools, testers and auxiliary items required

• multimeter.

• Wiring diagram.

Test requirements

• Secondary Air Injection (AIR) Pump Relay (-J299- )fuses OK.

• Motronic Engine Control Module (ECM) Power Supply Relay (J271) fuse OK.

• Battery voltage at least 12.5 V.

• All electrical consumers switched off.

• A/C switched off.

• The ignition switched on.

Test procedure

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

Start diagnosis

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

Checking voltage

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

- Using a Multimeter, check the Secondary Air Injection (AIR) Pump Relay (J299) socket 1 (relay terminal 30) to Ground (GND).

Specified value: battery voltage.

If the specified value was Not obtained:

- Check the wiring connection from the Secondary Air Injection (AIR) Pump Relay (J299) socket 1 (relay terminal 30) to the Battery (+) terminal for an open circuit or high resistance.

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

- If necessary, repair the faulty wiring connection.

If the specified value was obtained:

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

Start the engine.

- Using a multimeter, check the Secondary Air Injection (AIR) Pump Relay (J299) socket 2 (relay terminal 87) to ground.

Specified value: battery voltage.

- Switch the ignition off.

If the specified value was Not obtained:

- Check the circuit from the Secondary Air Injection (AIR) Pump Relay (J299) socket 2 (relay terminal 87) through fuse 27 in Fuse Box B, out to the Secondary Air Injection (AIR) Pump Motor (V101) connector, terminal 2 for an open circuit or a short circuit to Ground (GND).

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

- If necessary, repair the faulty wiring connection and replace fuse if blown.

If the specified value was obtained:

Checking wiring

If the manufacturers test box is being used, perform the following step.

- Install the test box.

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

- Remove the Engine Control Module (ECM) (J623). Refer to the repair information.

- Using a multimeter, check the Secondary Air Injection (AIR) Pump Relay (J299) socket 4 (relay terminal 85) to the Engine Control Module (ECM) (J623) electrical harness connector T94 terminal 94 for resistance.





Specified value: 1.5 ohms Max.

If the specified value was Not obtained:

- Check the wiring for an open circuit, 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.

- Perform a road test to verify repair.

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 ] Scan Tool Testing and Procedures.

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

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