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

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.

If the manufacturers test box is not being used. Perform the following step.
- Remove the Motronic Engine Control Module (ECM) J220.
- 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.

Secondary Air Injection (AIR) Motronic Engine Control Module (ECM)
Pump Relay -J299- socket J220 electrical connector terminal or test
terminal box socket
6/T 66

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-.

If no malfunction is found in the wiring and voltage supply was not OK:
- Replace the Motronic Engine Control Module (ECM) J220.

Final procedures
After the repair work, the following work steps must be performed in the following sequence:
1. Check the DTC memory. Diagnostic Mode 03 - Read DTC Memory
2. If necessary, erase the DTC memory. Diagnostic Mode 04 - Erase DTC Memory
3. If the DTC memory was erased, generate readiness code.

- End of diagnosis.