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 SYSTEMSPOWER STEERING PRESSURE SWITCHTESTING AND INSPECTION
2005 Mazda MX-5 Miata L4-1.8L DOHC
Power Steering Pressure Switch: Testing and Inspection
2005 Mazda MX-5 Miata L4-1.8L DOHCSECTION Testing and Inspection
POWER STEERING PRESSURE (PSP) SWITCH INSPECTION
Inspection of Continuity
NOTE: Perform the following test only when directed.
1. Inspect as follows if power steering is inoperative:
- POWER STEERING FLUID INSPECTION (See POWER STEERING FLUID INSPECTION)
2. Disconnect the PSP switch connector.
3. Start the engine.
4. Inspect for continuity between PSP switch terminal and GND using an ohmmeter.
- If not as specified, replace the PSP switch.
- If PSP switch is okay but PID value is out of specification, perform the "Circuit Open/Short Inspection."
5. Reconnect the PSP switch connector.
Circuit Open/Short Inspection
Open circuit
- If there is no continuity, the circuit is open. Repair or replace the harness.
- Power circuit (PSP switch connector terminal and PCM connector terminal 4C through common connector.)
- GND circuit (PSP switch GND circuit.)
Short circuit
- If there is continuity, the circuit is shorted. Repair or replace the harness.
- PSP switch connector terminal and PCM connector terminal 4C through common connector to GND.
Inspection of Continuity
NOTE: Perform the following test only when directed.
1. Inspect as follows if power steering is inoperative:
- POWER STEERING FLUID INSPECTION (See POWER STEERING FLUID INSPECTION)
2. Disconnect the PSP switch connector.
3. Start the engine.
Specification:
4. Inspect for continuity between PSP switch terminal and GND using an ohmmeter.
- If not as specified, replace the PSP switch.
- If PSP switch is okay but PID value is out of specification, perform the "Circuit Open/Short Inspection."
5. Reconnect the PSP switch connector.
Circuit Open/Short Inspection
Open circuit
- If there is no continuity, the circuit is open. Repair or replace the harness.
- Power circuit (PSP switch connector terminal and PCM connector terminal 4C through common connector.)
- GND circuit (PSP switch GND circuit.)
Short circuit
- If there is continuity, the circuit is shorted. Repair or replace the harness.
- PSP switch connector terminal and PCM connector terminal 4C 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.