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.
SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSMAZDA1990626 L4-2184CC 2.2L SOHC F2REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSOXYGEN SENSORTESTING AND INSPECTION
1990 Mazda 626 L4-2184cc 2.2L SOHC F2
Oxygen Sensor: Testing and Inspection
1990 Mazda 626 L4-2184cc 2.2L SOHC F2SECTION Testing and Inspection
OUTPUT VOLTAGE
Output Voltage Check:
1. Warm engine to operating temperature and run at idle.
2. Disconnect oxygen sensor connector. Connect voltmeter between sensor and ground.
3. Run engine at 4500 rpm until meter indicates approximately 0.7V.
4. Increase and decrease engine speed suddenly several times. Verify that meter reads 0.5 - 1.0V when speed is increased and 0 - 0.4V when speed is decreased.
5. If not as specified, replace sensor.
SENSITIVITY
Sensitivity Check:
NOTE: This test requires use of Mazda Self-Diagnosis Checker (SST #49 H018 9A1) or suitable aftermarket "Scan" tool.
1. Warm engine to operating temperature.
2. Connect test tool to check connector.
3. Increase engine speed to between 2000 and 3000 rpm. Verify that monitor lamp flashes more than 8 times during a 10 second period.
4. If not as specified, replace sensor.
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.