Secondary Air Injection Pump Relay, Checking
Secondary Air Injection Pump Relay, Checking
Observe all safety precautions: => [ Safety Precautions ] Generic Scan Tool
View clean working conditions: => [ Clean Working Conditions ] Clean Working Conditions
Use only gold-plated terminals when servicing any component with gold-plated electrical harness connector terminals.
For wiring diagrams, component locations, and connector views, Refer to the applicable wiring diagram.
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). Refer to the appropriate service information.
Checking voltage
- Using a Multimeter, check the Secondary Air Injection (AIR) Pump Relay (J299) socket 2/30 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 2/30 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 8/87 to Ground (GND) for voltage.
Specified value: battery voltage.
- Switch the ignition off.
If the specified value was not obtained:
- Check the wiring connection from the Secondary Air Injection (AIR) Pump Relay (J299) socket 8/87 to the Secondary Air Injection (AIR) Pump Motor (V101) socket 2 for an open circuit.
- 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 the appropriate service information.
- Using a multimeter, check the Secondary Air Injection (AIR) Pump Relay (J299) socket 6/85 to the Engine Control Module (ECM) (J623) electrical harness connector T94 terminal 23 for resistance.
Specified value: 1.5 ohms Max.
If the specification was not obtained:
- Check the wiring for a short circuit to Battery (+), or an open circuit.
- 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). Refer to the appropriate service information.
- Erase the DTC memory. Refer to => [ Diagnostic Mode 04 - Erase DTC Memory ] Diagnostic Modes 01 - 09.
- Perform a road test to verify repair.
If the DTC does not return:
Generate readiness code. Refer to => [ Readiness Code ] Monitors, Trips, Drive Cycles and Readiness Codes.
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 the appropriate service information.
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 Modes 01 - 09.
2. If necessary, erase the DTC memory. Refer to => [ Diagnostic Mode 04 - Erase DTC Memory ] Diagnostic Modes 01 - 09.
3. If the DTC memory was erased, generate readiness code. Refer to => [ Readiness Code ] Monitors, Trips, Drive Cycles and Readiness Codes.