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 MANUALSMAZDA2005MX-5 MIATA L4-1.8L DOHCREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTEMISSION CONTROL SYSTEMSEXHAUST GAS RECIRCULATIONEGR BOOST SENSORTESTING AND INSPECTION
2005 Mazda MX-5 Miata L4-1.8L DOHC
EGR Boost Sensor: Testing and Inspection
2005 Mazda MX-5 Miata L4-1.8L DOHCSECTION Testing and Inspection
EGR BOOST SENSOR
NOTE: Perform the following test only when directed.
1. Inspect the EGR boost sensor (BP), BARO/MAP sensor (BP WITH TC) for damage and cracks.
2. Inspect the vacuum hose for improper routing, kinks or leaks.
- If the above are okay, perform the "Circuit Open/Short Inspection."
3. Reconnect the EGR boost sensor (BP), BARO/MAP sensor (BP WITH TC) connector.
- If the above open or short circuit are correct, replace EGR boost sensor (BP), BARO/MAP sensor (BP WITH TC).
Circuit Open/Short Inspection
Open circuit
- If there is no continuity, the circuit is open. Repair or replace the harness.
- EGR boost circuit (EGR boost sensor (BP), BARO/MAP sensor (BP WITH TC) connector terminal B and PCM connector terminal 4AE.)
- Reference voltage circuit (EGR boost sensor (BP), BARO/MAP sensor (BP WITH TC) connector terminal C and PCM connector terminal 4L.)
- GND circuit (EGR boost sensor (BP), BARO/ MAP sensor (BP WITH TC) connector terminal A and PCM connector terminal 40 through common connector.)
Short circuit
- If there is continuity, the circuit is shorted. Repair or replace the harness.
- EGR boost sensor (BP), BARO/MAP sensor (BP WITH TC) connector terminal C and PCM connector terminal 4L through common connector to GND.
- EGR boost sensor (BP), BARO/MAP sensor (BP WITH TC) connector terminal B and PCM connector 4AE through common connector to GND.
NOTE: Perform the following test only when directed.
1. Inspect the EGR boost sensor (BP), BARO/MAP sensor (BP WITH TC) for damage and cracks.
2. Inspect the vacuum hose for improper routing, kinks or leaks.
- If the above are okay, perform the "Circuit Open/Short Inspection."
3. Reconnect the EGR boost sensor (BP), BARO/MAP sensor (BP WITH TC) connector.
- If the above open or short circuit are correct, replace EGR boost sensor (BP), BARO/MAP sensor (BP WITH TC).
Circuit Open/Short Inspection
Open circuit
- If there is no continuity, the circuit is open. Repair or replace the harness.
- EGR boost circuit (EGR boost sensor (BP), BARO/MAP sensor (BP WITH TC) connector terminal B and PCM connector terminal 4AE.)
- Reference voltage circuit (EGR boost sensor (BP), BARO/MAP sensor (BP WITH TC) connector terminal C and PCM connector terminal 4L.)
- GND circuit (EGR boost sensor (BP), BARO/ MAP sensor (BP WITH TC) connector terminal A and PCM connector terminal 40 through common connector.)
Short circuit
- If there is continuity, the circuit is shorted. Repair or replace the harness.
- EGR boost sensor (BP), BARO/MAP sensor (BP WITH TC) connector terminal C and PCM connector terminal 4L through common connector to GND.
- EGR boost sensor (BP), BARO/MAP sensor (BP WITH TC) connector terminal B and PCM connector 4AE through common connector to GND.
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.