Secondary Air Injection Pump Motor, Checking
Secondary Air Injection Pump Motor, Checking
Special tools, testers and auxiliary items required
• Multimeter.
• Wiring diagram.
Test requirements
• The Secondary Air Injection (AIR) Pump Relay (-J299-) fuses OK.
• The 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.
•
Test procedure
- Perform a preliminary check to verify the customers complaint. Refer to => [ Preliminary Check ] Preliminary Check.
Start diagnosis
• The engine MUST be cold (room temperature) in order for the ECM to command the air pump relay ON. The pump runs for approximately 20 seconds. Once the engine has been started, the ECM will not command the pump to run again for approx 6 hrs. Due to potential damage to the catalyst, the generic scan tool has no provision for AIR relay driver control.
- Disconnect the Secondary Air Injection (AIR) Pump Relay (-J299-) in the underhood fuse panel- R2 -.
Checking operation
- Using a jumper, connect AIR pump relay terminals 3 to 5
- Turn the ignition ON.
- The AIR pump should be running.
- Turn the ignition OFF.
If the pump does operate when using a jumper at the relay:
- Connect a test lamp to terminal 5 of the AIR relay.
- Turn the ignition ON.
- The test lamp should be ON.
- Turn the ignition OFF.
- If the test lamp did Not turn on, locate the open circuit between the relay and fuse 23 of Fuse Panel B.
- If the test lamp did turn ON, remove the Motronic Engine Control Module (ECM) (J623). Refer to the appropriate repair manual.
- Using a multimeter, check the AIR pump relay terminal 2 to the Motronic Engine Control Module (ECM) (J623) electrical harness connector T121 terminal 46 for resistance.
Specified value: 1.5 ohms max.
- If the specified value was not obtained, repair the circuit as necessary.
- If the specified value was obtained, exchange the AIR relay - R2 - with the ECM power supply relay - R1 - located next to it.
- Attempt to start the engine. If the engine does not start, replace the defective relay.
- If the engine did start, replace the Motronic Engine Control Module (ECM) (J623). Refer to the appropriate repair manual.
If the pump did Not operate when using a jumper at the relay:
- Switch the ignition off.
- Remove the AIR pump relay.
Connect a test lamp to the AIR relay terminal 3
- Turn the Ignition switch ON. The test lamp should turn ON.
- If the test lamp does Not turn on, locate the open circuit between the relay and battery positive connection.
- If the test lamp does turn ON, disconnect the AIR pump connector - 3 -.
- Switch the key off.
- Using a multimeter, check the AIR pump electrical harness connector, terminal 2 to the AIR relay terminal 5 for resistance.
Specified value: 1.5 ohms max.
If the specified value was Not obtained:
- Check the wiring connection from the AIR relay terminal 5 to the AIR pump electrical harness connector terminal 2 for an open, short circuit or high resistance. If necessary, repair the faulty wiring or connection.
If the specified value was obtained:
- Using a multimeter, check the AIR pump electrical harness connector, terminal 1 to ground for resistance.
Specified value: 1.5 ohms max.
If the specified value was Not obtained:
- Repair the open ground circuit.
If the specified value was obtained:
Replace the Secondary Air Injection (AIR) Pump Motor (-V101-). Refer to the appropriate repair manual.
Specified value: 1.5 ohms Max.
If the specified value was Not obtained:
- Check the wiring for an open or high resistance.
- 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:
- Erase the DTC memory. Refer to => [ Diagnostic Mode 04 - Erase DTC Memory ] Scan Tool Testing and Procedures.
- Perform a road test to verify repair.
If the DTC does not return:
Generate readiness code. Refer to => [ Readiness Code ] Readiness Code.
If the DTC does return and no malfunction is detected in the wiring and the voltage supply was OK:
- Replace the Motronic Engine Control Module (ECM) (J623). Refer to the appropriate repair manual.
- Assembly is performed in the reverse of the removal.
Final procedures
After the 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 ] Readiness Code.