Air Injection Pump Relay: Testing and Inspection
Secondary Air Injection Pump Relay J299, Checking
Special tools, testers and auxiliary items required
• Multimeter.
• Wiring diagram.
Test requirements
• The Secondary Air Injection (AIR) Pump Relay (J299) fuses OK.
• The Power Supply Relay (terminal 30, B+) (J317) fuse 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 ] 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 1/30 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 1/30 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:
- Switch the ignition on.
- Using a Multimeter, check the Power Supply Relay (terminal 30, B+) (J317) socket 87 to the Secondary Air Injection (AIR) Pump Relay (J299) socket 3/85 for voltage.
Specified value: battery voltage.
- Switch the ignition off.
If the specified value was not obtained:
- Check the wiring connections from the Power Supply Relay (terminal 30, B+) (J317) socket 87 to the Secondary Air Injection (AIR) Pump Relay (J299) socket 3/85 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 activation
- Install the Secondary Air Injection (AIR) Pump Relay (J299).
- Switch the ignition on.
- Using a Multimeter, check the Secondary Air Injection (AIR) Pump Relay (J299) socket 4/86 to Ground (GND)
- Switch the ignition off.
Specified value: battery voltage.
If the specified value was not obtained:
- Check or replace the Secondary Air Injection (AIR) Pump Relay (J299).
- 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 105 Pin (VAG1598/31).
If the manufacturers test box is not being used. Perform the following step.
- Remove the Engine Control Module (ECM) (J623). Refer to => [ Engine Control Module J623, Replacing ] Engine Control Module J623, Replacing.
- Using a Multimeter, check the Secondary Air Injection (AIR) Pump Relay (J299) socket 4/86 to the Engine Control Module (ECM) (J623) electrical harness connector T121 terminal 46 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).
If no malfunction is found in the wiring and voltage supply was not OK:
- Erase the DTC memory. Refer to => [ Diagnostic Mode 04 - Erase DTC Memory ] Diagnostic Mode 04 - Erase DTC Memory
- Perform a road test to verify repair.
If the DTC does not return:
Repair complete, Generate readiness code. Refer to => [ Readiness Code Description ] 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 Engine Control Module (ECM) (J623). Refer to => [ Engine Control Module J623, Replacing ] Engine Control Module J623, 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. 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 ] Readiness Code Description.
End of diagnosis