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 MANUALSMAZDA1991626 L4-2184CC 2.2L SOHC F2REPAIR AND DIAGNOSISTRANSMISSION AND DRIVETRAINAUTOMATIC TRANSMISSION/TRANSAXLETESTING AND INSPECTIONCOMPONENT TESTS AND GENERAL DIAGNOSTICSTHROTTLE PRESSURE TESTS
1991 Mazda 626 L4-2184cc 2.2L SOHC F2
Throttle Pressure Tests
1991 Mazda 626 L4-2184cc 2.2L SOHC F2SECTION Throttle Pressure Tests
Throttle Pressure Test
This test measures throttle pressures for checking the hydraulic components and for improper adjustment of throttle cable.
Preparation
1. Perform the preparation procedure:
- Check the engine coolant, engine oil, and ATF levels before testing.
- Warm the engine thoroughly to raise the ATF temperature to operating level (60-70 °C, 140-158°F)
2. Connect a tachometer to the engine.
3. Connect the SST to the throttle pressure inspection hole (square head plug "T").
1. Start the engine and check the idle speed in P range.
Idle speed: 750 +/- 25 rpm
2. Shift the selector lever to D range and read the throttle pressure at idle.
Caution: Steps 3 to 4 must be performed within 5 seconds to prevent possible transaxle damage.
3. Depress the brake pedal firmly with the left foot and gradually depress the accelerator pedal with the right foot.
4. Read the throttle pressure as soon as the engine speed becomes constant, then release the accelerator pedal.
Throttle Pressures and Test Evaluation
This test measures throttle pressures for checking the hydraulic components and for improper adjustment of throttle cable.
Preparation
1. Perform the preparation procedure:
- Check the engine coolant, engine oil, and ATF levels before testing.
- Warm the engine thoroughly to raise the ATF temperature to operating level (60-70 °C, 140-158°F)
2. Connect a tachometer to the engine.
3. Connect the SST to the throttle pressure inspection hole (square head plug "T").
1. Start the engine and check the idle speed in P range.
Idle speed: 750 +/- 25 rpm
2. Shift the selector lever to D range and read the throttle pressure at idle.
Caution: Steps 3 to 4 must be performed within 5 seconds to prevent possible transaxle damage.
3. Depress the brake pedal firmly with the left foot and gradually depress the accelerator pedal with the right foot.
4. Read the throttle pressure as soon as the engine speed becomes constant, then release the accelerator pedal.
Throttle Pressures and Test Evaluation
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.