Secondary Air Injection Pump Motor, Checking
Diagnostic Procedures
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
- Remove the AIR pump relay.
- Using a jumper, connect terminals 30 to 87 of the AIR pump relay socket.
- Turn the ignition ON.
- The AIR pump should be running.
- Turn the ignition OFF.
If the pump does Not operate when using a jumper at the relay:
Connect a test lamp to terminal 30 of the AIR relay socket
- Turn the Ignition switch ON. The test lamp should turn ON.
- Turn the ignition OFF.
- If the test lamp did Not turn ON, locate the open circuit between relay terminal 30 and battery positive connection.
- If the test lamp does turn ON, disconnect the AIR pump connector - 3 -.
- Using a multimeter, check the AIR pump electrical harness connector, terminal 2 (through fuse 27 in Fuse Box B) to the AIR relay terminal 87 for resistance. Refer to Wiring Diagrams.
Specified value: 1.5 ohms max.
If the specified value was Not obtained:
- Check the wiring connection from the AIR relay terminal 87 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. Replace any open fuse.
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 or high resistance in the ground circuit.
If the specified value was obtained:
Replace the Secondary Air Injection (AIR) Pump Motor (-V101-).
If the pump does operate when using a jumper at the relay:
- Connect a test lamp to terminal 85 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 does turn ON, remove the Motronic Engine Control Module (ECM) (J623). Refer to the repair information.
- Using a multimeter, check the AIR pump relay terminal 86 to the Motronic 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 for an open, high resistance or short and repair as necessary.
- If the specified value was obtained, exchange the AIR relay with the ECM power supply relay located next to it.
- Attempt to start the engine. If the engine does not start, replace the defective relay.
- Switch the ignition off.
- If the engine does start, replace the Motronic Engine Control Module (ECM) (J623). Refer to the repair information.
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 ] Monitors, Trips, Drive Cycles and Readiness Codes.