Parts for your 2004 Mazda Premacy-Throttle position sensors

2004 Mazda Premacy throttle-position-sensor (TPS)

Based on technical references including the Mazda Premacy (CP) Workshop Manual 1999–2005, the Mazda Electrical Wiring Diagram for CP-series Premacy, and Autodata engine management specifications for the 1.8L and 2.0L petrol variants sold in Australia and New Zealand, the 2004 Mazda Premacy is fitted with a throttle position sensor (TPS) on the throttle body. Those sources list the TPS as an ECU input and detail testing procedures for the three-wire potentiometer-type sensor, confirming it’s relevant to this model.

On a 2004 Mazda Premacy, the TPS tells the engine control unit how far the throttle plate is opened. That signal lets the ECU sort fuelling, ignition timing, idle speed control, and even auto transmission shift behaviour. When the TPS is healthy, throttle response feels clean and predictable, cold starts settle quickly, and fuel economy sits where it should.

Common signs of a crook TPS include hesitant take-off, flat spots, hunting idle, unexpected kickdown or lazy shifts (autos), higher fuel use, and the check engine light with codes such as P0121–P0123 or related TP circuit faults. Under the bonnet, the sensor sits on the throttle body with a three-pin plug, on cable-throttle Premacy models it’s opposite the throttle cable linkage.

As part of routine servicing, the TPS isn’t a scheduled replacement item, but it’s smart to:

• Inspect the connector and wiring for corrosion or rub-through each 20,000 km.
• Clean the throttle body bore and plate with sensor-safe cleaner, avoiding soaking the TPS itself.
• Scan live data to check TPS percentage/voltage sweeps smoothly from roughly 0.5 V closed to about 4.5 V wide open with no drop-outs.

If replacement is needed, stick with quality OEM-equivalent parts. The job typically involves disconnecting the battery, unplugging the sensor, removing two screws, aligning the new sensor (some are slotted for adjustment), and refitting. Final alignment is verified with a scan tool by checking the closed-throttle value sits within spec, workshop data should be followed for exact values and screw torque. After replacement or a battery disconnect, the ECU will relearn idle. A simple relearn routine—warm the engine, let it idle for several minutes with A/C off, then on, and take a short drive with gentle to moderate throttle—usually does the trick.

Handled properly, a good TPS keeps the Premacy feeling crisp and fuss-free around town and on the open road.

Popular questions

Where is the TPS located on a 2004 Mazda Premacy?
It’s mounted on the throttle body, typically on the side opposite the throttle cable linkage. Look for a small black sensor with a three-pin electrical connector. Access is straightforward once the intake duct is removed.

Can a dirty throttle body cause TPS fault codes?
A filthy throttle bore can upset idle control and drivability, but true TPS circuit codes usually point to a worn sensor or wiring/connectors. Cleaning the throttle body helps the idle and response, while TPS codes call for sensor testing with a scan tool and multimeter.

Does the ECU need a relearn after TPS replacement?
Yes. The ECU adapts to the new sensor’s baseline. After installation, allow the engine to reach operating temperature, let it idle for a few minutes with A/C off and then on, and take a short drive using light to moderate throttle. This helps the ECU settle trims and idle control.