MX-5 Miata Mazdaspeed L4-1.8L DOHC Turbo (2004)
Throttle Position Sensor: Testing and Inspection
THROTTLE POSITION (TP) SENSOR INSPECTION
NOTE:
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The TP sensor on this type of vehicle is maintenance-tree.
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Perform the following test only when directed.
1. Measure the PID value.
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If PID value is not as specified, inspect as follows:
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Verify that the throttle valve is fully closed.
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Accelerator cable free play (See ACCELERATOR CABLE INSPECTION/ADJUSTMENT)
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Throttle cable free play (See ACCELERATOR CABLE INSPECTION/ADJUSTMENT)
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If the above are okay, but PID value is out of specification, perform the "Circuit Open/Short Inspection".
2. Reconnect the TP sensor connector.
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If the above open or short circuit are correct, replace TP sensor.
Circuit Open/Short Inspection
Open circuit
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If there is no continuity, the circuit is open. Repair or replace the harness.
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Reference voltage circuit (TP sensor connector terminal A and PCM connector terminal 4L.)
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TP circuit (TP sensor connector terminal C and PCM connector terminal 4V.)
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GND circuit (TP sensor connector terminal B and PCM connector terminal 4O.)
Short circuit
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If there is continuity, the circuit is shorted. Repair or replace the harness.
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TP sensor connector terminal A and PCM connector terminal 4L to GND.
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TP sensor connector terminal C and PCM connector terminal 4V to GND.