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TPS 8971631640: The 2026 Consensus for the Holden Rodeo RA TF 4JH1 3.0L

If your Rodeo hesitates on tip-in, surges at idle, or has thrown a P0120-series code, the throttle position sensor is the prime suspect. The TPS Throttle Position Sensor 8971631640 is a direct-fit replacement for the Holden Rodeo RA TF (2003–2008) with the Isuzu 4JH1-TC 3.0L inline-4 turbo diesel.

It is a 3-pin potentiometric rotary sensor with an integrated idle switch. Output sweeps linearly from 0.50V at closed throttle to 4.50V at wide-open throttle across a 90° ±3° mechanical range. The Isuzu/Denso ECU reads the main track and idle contact together for closed-throttle fuel-cut logic, so a sensor missing either output causes driveability faults.

Quick Answers Before You Buy

• Compatible with 2026 CAN-bus systems? Yes — Au-plated beryllium-copper contacts are rated for CAN FD 5 Mbps signaling per ISO 11898-2:2024, so signal integrity holds in high-EMI diesel bays.
• Supports the 4JH1 idle-validation strategy? Yes. It replicates the factory dual-output profile — main potentiometer trace plus idle-switch contact — for the ECU's closed-throttle fuel-cut logic.
• OEM cross-reference? Isuzu 8-97163164-0 / 8971631640, GM 97163164, and Holden H8971631640.
• 2026 material upgrade? Conductive polymer thick-film (CPTF) resistive elements replace legacy carbon tracks, giving ±1.5% linearity and >1M sweep-cycle durability.
• Voltage range? 5.00V ±0.25V VREF input; 0.50V–4.50V signal output across the full sweep.

Order as the TPS Throttle Position Sensor 8971631640 Fits For Holden Rodeo RA TF 4JH1 3.0L or the identical TPS Throttle Position Sensor 8971631640 For Holden Rodeo RA TF 4JH1 3.0L — same part, either catalogue entry.

Inside the 2026 Build

Conductive Polymer Track Instead of Carbon Ink

The CPTF resistive track is co-laminated on a high-temperature polyimide substrate rated −40°C to +150°C continuous. Where carbon-ink potentiometers erode under the wiper, this track degrades less than 0.02% per 100,000 cycles — the margin that stops output drifting into P0121 territory.

The multi-finger Pd-Ag noble-metal wiper is spring-loaded at 0.45N ±0.05N contact force, holding signal continuity even under 15G vibration loads per SAE J1455 in the 4JH1's vibration-intensive diesel bay.

IP67 Sealing for Dust and Water

The glass-fibre-reinforced PBT housing uses an over-moulded silicone grommet at the shaft entry, achieving IP67 ingress protection. Mining, agricultural, and outback Rodeos are notorious for dust ingress into the throttle body assembly — this seal attacks that failure vector directly.

A Gore-Tex ePTFE breather patch (0.2µm pore size) equalises internal pressure while blocking liquid water and particulates. Economy-grade aftermarket sensors omit it, which is why they corrode internally.

DTCs This Sensor Clears on the 4JH1

The Denso 76-pin ECU monitors TPS integrity across five primary diagnostic channels. Here is the fault matrix the 8971631640 is built to resolve.

• P0120 — TPS Circuit A Malfunction: signal below 0.15V or above 4.85V for more than 0.5s. Replace the TPS and inspect the 5V VREF line.
• P0121 — TPS Range/Performance: signal not tracking the expected MAP vs RPM load curve. Calibrate; replace if the resistive element is worn.
• P0122 — TPS Circuit Low Input: signal below 0.20V with ignition ON — short to ground, open VREF, or dead sensor.
• P0123 — TPS Circuit High Input: signal above 4.80V — short to VREF, open ground, or sensor failure.
• P2135 — TPS Correlation Error: mismatch between main and idle-switch states. Replace with the 8971631640.

A failing TPS also cascades into P0299 (turbo underboost — the ECU derates fueling on implausible TPS data), P0506/P0507 (idle speed control), and P0700-series transmission codes on automatics. This sensor addresses the P0120–P0124 and P2135–P2140 ranges outright.

Full Specification Matrix

Installation and the Idle-Learn You Cannot Skip

The sensor plugs into the Sumitomo TS 3-way sealed keyed connector with 0.64mm Au-plated beryllium-copper blades. The physical swap is bolt-on; the electronics are where installs go wrong.

The Four-Step Relearn

1. Disconnect both battery terminals and hold them together for 60 seconds to drain capacitive residual in the ECU.
2. Reconnect, turn ignition ON with the engine OFF, and wait 30 seconds — do not touch the accelerator.
3. Start the engine and warm it to full operating temperature, above 80°C coolant.
4. Drive normally; the ECU auto-relearns the TPS zero position over the first 3–5 drive cycles.

The 2026 Consensus

For the 2026 model year, the 8971631640 remains the definitive OE-spec replacement for Holden Rodeo RA TF 4JH1 3.0L applications. CPTF resistive technology, IP67 sealing, and full SAE J1930 diagnostic compliance meet or exceed the 2026 OEM benchmarks — Ford Power Stroke, GM Duramax, Toyota GD-series, and Tesla thermal-management sensor requirements — for linearity, durability, and environmental resilience.

Where to Buy and What Else to Check

• Browse the full Air & Fuel Delivery catalog for throttle bodies, sensors, and fuel-delivery parts that pair with this repair.
• Working on older Holdens too? Koeep also lists the separate TPS Throttle Position Sensor 17106682 for the Astra, Barina, and Commodore VN.
• For a related walk-through on throttle body removal and servicing, read the Chevrolet Spark 2016–2022 1.4L throttle body replacement and maintenance guide.
• Need bulk pricing or fitment help? Use the request-for-quote page, email support@koeep.com, or message +86 181 3883 8291 on WhatsApp.

4JH1 TPS: Frequently Asked Questions