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 MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSCRANKSHAFT POSITION SENSORTESTING AND INSPECTION
2005 Mazda MX-5 Miata L4-1.8L DOHC
Crankshaft Position Sensor: Testing and Inspection
2005 Mazda MX-5 Miata L4-1.8L DOHCSECTION Testing and Inspection
CRANKSHAFT POSITION (CKP) SENSOR INSPECTION
Inspection of Air Gap
NOTE: Perform the following test only when directed.
1. Measure the air gap between each four projections of the plate behind the crankshaft pulley and the CKP sensor using a feeler gauge.
- If not as specified, adjust the CKP sensor air gap and inspect as follows:
- Is any of the four projections of the plate behind the crankshaft pulley twisted or bent.
- If not adjusted, replace the plate behind the crankshaft pulley (See PLATE REMOVAL/ INSTALLATION [BP, BP WITH TC].) or CKP sensor. (See CRANKSHAFT POSITION (CKP) SENSOR REMOVAL/INSTALLATION [BP, BP WITH TC].)
- If CKP sensor PID value is out of specification, perform the "Circuit Open/Short Inspection".
Specification
0.5 - 1.5 mm {0.020 - 0.059 in}
2. Reconnect the CKP sensor connector.
Circuit Open/Short Inspection
Open circuit
- If there is no continuity, the circuit is open. Repair or replace the harness.
- CKP circuit (CKP sensor connector terminal B and PCM connector terminal 3Y.)
- Power circuit (CKP sensor connector terminal A and main relay terminal D through common connector.)
- GND circuit (CKP sensor connector terminal C and PCM connector terminal 4A through common connector.)
Short circuit
- If there is continuity, the circuit is shorted. Repair or replace the harness.
- CKP sensor connector terminal B and PCM connector terminal 3Y circuit through common connector to GND.
- CKP sensor connector terminal A and main relay terminal D through common connector to GND.
Inspection of Air Gap
NOTE: Perform the following test only when directed.
1. Measure the air gap between each four projections of the plate behind the crankshaft pulley and the CKP sensor using a feeler gauge.
- If not as specified, adjust the CKP sensor air gap and inspect as follows:
- Is any of the four projections of the plate behind the crankshaft pulley twisted or bent.
- If not adjusted, replace the plate behind the crankshaft pulley (See PLATE REMOVAL/ INSTALLATION [BP, BP WITH TC].) or CKP sensor. (See CRANKSHAFT POSITION (CKP) SENSOR REMOVAL/INSTALLATION [BP, BP WITH TC].)
- If CKP sensor PID value is out of specification, perform the "Circuit Open/Short Inspection".
Specification
0.5 - 1.5 mm {0.020 - 0.059 in}
2. Reconnect the CKP sensor connector.
Circuit Open/Short Inspection
Open circuit
- If there is no continuity, the circuit is open. Repair or replace the harness.
- CKP circuit (CKP sensor connector terminal B and PCM connector terminal 3Y.)
- Power circuit (CKP sensor connector terminal A and main relay terminal D through common connector.)
- GND circuit (CKP sensor connector terminal C and PCM connector terminal 4A through common connector.)
Short circuit
- If there is continuity, the circuit is shorted. Repair or replace the harness.
- CKP sensor connector terminal B and PCM connector terminal 3Y circuit through common connector to GND.
- CKP sensor connector terminal A and main relay terminal D through common connector to GND.
RENDER: 1.0x
NO RELATED
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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.