Parts for your 2019 Isuzu D-max-Throttle position sensors

2019 Isuzu D‑MAX throttle position sensors — are they actually used?

Short answer: no, a traditional standalone throttle position sensor (TPS) isn’t used on the 2019 Isuzu D‑MAX 3.0‑litre 4JJ1 turbo‑diesel. According to the Isuzu D‑MAX 2012–2020 Workshop Manual (Engine Control System and Intake Air System sections) and IDSS (Isuzu Diagnostic Service System) wiring diagrams, this model uses a dual‑track accelerator pedal position (APP) sensor to read the driver’s pedal input, and an electronically actuated intake throttle (often called the intake air control valve or intake shutter) that has its own built‑in position feedback. There’s no separate, serviceable TPS like you’d find on many petrol engines.

Why that is comes down to how diesels work. The 4JJ1 controls torque with fuel quantity, not by choking airflow with a throttle plate as in a petrol. The D‑MAX’s motorised intake throttle is there mainly to manage EGR flow and to smooth engine shut‑down, not to meter air for power. Parts catalogues for VIN‑coded 2019 models list an accelerator pedal assembly and an intake throttle body/actuator, but no standalone TPS unit. Fault finding in IDSS also points you to “APP Sensor 1/2” and “Throttle Actuator/Position” within the intake shutter assembly rather than a discrete TPS.

So if someone’s chasing a “TPS” issue on a 2019 D‑MAX, they’re really looking at one of these two systems:

• Accelerator Pedal Position sensor (at the pedal) — dual‑track for redundancy, supplies the ECU with driver demand.
• Intake throttle/air control valve — an electric motor with integrated position sensor, used for EGR control and shut‑down smoothness.

Typical symptoms of trouble include limp mode, hesitation off idle, surging at steady cruise, rough or shuddery shut‑down, or EGR‑related fault codes. Common checks include verifying 5‑volt reference and grounds at the pedal connector, inspecting harnesses for chafing, and cleaning carbon build‑up in the intake throttle if it’s sticking. After replacing the pedal assembly or the intake throttle, follow the Isuzu procedure in IDSS for relearn/calibration. There’s no periodic “TPS service” on this ute because there isn’t a standalone TPS to service.

Does a 2019 Isuzu D‑MAX have a throttle position sensor (TPS)?

No. The 2019 D‑MAX 3.0‑litre 4JJ1 turbo‑diesel doesn’t use a standalone TPS like a petrol engine. It uses a dual‑track accelerator pedal position (APP) sensor for driver input and an electronically actuated intake throttle (intake air control valve) with internal position feedback for EGR and smooth shut‑down. There’s no separate, serviceable TPS on the throttle body.

What causes “TPS”‑style faults on a 2019 D‑MAX and what should be checked?

Most throttle‑related faults come from the APP sensor assembly at the pedal or the intake throttle/air control valve and their wiring. Look for fault codes that reference the APP circuit or throttle actuator. Check the connectors for corrosion, verify 5‑volt reference and grounds, and consider cleaning or replacing the intake throttle if it sticks. Calibration is done via IDSS after component replacement.

Is there any servicing for a TPS on a 2019 D‑MAX?

There’s no TPS to service. As part of regular servicing, inspect the accelerator pedal assembly and loom, and clean the intake throttle body and EGR passages if carbon build‑up is noted. If the intake throttle or APP is replaced, follow the Isuzu procedure in IDSS for relearn or calibration.