Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSTOYOTA2004MATRIX XR, FWD, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 8 (EMISSION CONTROL SYSTEM (2ZZ-GE))AIR PUMP SYSTEMINSPECTION

2004 Toyota Matrix XR, FWD, Standard

Air Pump System: Inspection

2004 Toyota Matrix XR, FWD, StandardSECTION Inspection

WARNING: This page is about a different variant/trim than selected.

INSPECT AIR PUMP ASSY
1. Check the operation.
  1. Connect the positive (+) lead from the battery to terminal 1 and the negative (-) lead from the battery to terminal 2.
  2. Check that the air flows.
    If the operation is not as specified, replace the air pump.
    
    Fig 1: Checking That Air Flows
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

INSPECT AIR PUMP RELAY

Check the resistance.

Using an ohmmeter, measure the resistance between the terminals.

Standard:

TESTER CONNECTION AND SPECIFIED CONDITION

Tester Connection	Specified Condition
1-2	Continuity
3-4	10kΩ or higher
3-4	Below 1 Ω (Apply battery voltage to terminals 1 and 2)

If the result is not as specified, replace the air pump relay.

Fig 2: Identifying Air Pump Relay Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

INSPECT AIR SWITCHING VALVE ASSY
1. Check the operation.
  1. Apply a vacuum of 28 kPa (210 mmHg, 8.27 in.Hg) to port A, then blow air into port B. Check that the air is discharged from port C.
    If the operation is not as specified, replace the air switching valve.
    
    Fig 3: Checking Air Is Discharged From Port C
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

INSPECT VACUUM SWITCHING VALVE ASSY

Check the resistance.

Using an ohmmeter, measure the resistance between the terminals.

Standard:

TESTER CONNECTION AND SPECIFIED CONDITION

Tester Connection	Specified Condition
1-2	33 to 39 ohms at 20°C(68°F)

If the resistance is not as specified, replace the vacuum switching valve.

Fig 4: Measuring Resistance Between Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Check the vacuum switching valve for ground.

Using an ohmmeter, check the resistance between each terminal and the body.

Standard:

TESTER CONNECTION AND SPECIFIED CONDITION

Tester Connection	Specified Condition
1 - Body	10kΩ or higher
2 -Body	10 kΩ or higher

If the resistance is not as specified, replace the vacuum switching valve.

Fig 5: Checking Resistance Between Each Terminal And Body

Check the operation.
1. Check that air flows from port E to the filter. If the operation is not as specified, replace the vacuum switching valve.
  
  Fig 6: Checking Air Flows From Port E To Filter
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Apply battery positive voltage across the terminals.
3. Check that air flow from port E to port F.
  If the operation is not as specified, replace the vacuum switching valve.
  
  Fig 7: Checking Air Flow From Port E To Port F
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.