Secondary Air Injection Pump Relay, Checking
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 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 (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 (A) (+) terminal 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.
If the specified value was obtained:
- Switch the ignition on.
- 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.
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 => [ Motronic Engine Control Module, Replacing ] Motronic Engine Control Module, Replacing.
- Using a multimeter, check the Secondary Air Injection (AIR) Pump Relay (J299) socket 3/86 to the Engine Control Module (ECM) (J623) electrical harness connector T94 terminal 94 for resistance.
Specified value: 1.5 ohms Max.
If the specification 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. 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 ] Readiness Code.
- End diagnosis.
If the DTC returns and no malfunction is found in the wiring and the voltage supply was OK:
- Replace the Engine Control Module (ECM) (J623). Refer to => [ Motronic Engine Control Module, Replacing ] Motronic Engine Control Module, 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.