Parts for your 1991 Suzuki Swift-Throttle position sensors

1991 Suzuki Swift throttle-position-sensor (TPS) — purpose, service tips, and fitment

Technical sources confirm a throttle-position-sensor is used on 1991 Suzuki Swift models fitted with electronic fuel injection (EFI). The Suzuki Swift/GTi factory service manuals (1989–1994), the Haynes Suzuki Swift/Geo Metro manual (1985–2001), and Autodata test procedures all describe TPS location, adjustment and voltage sweep checks on G13B (GTi DOHC) and G13BA EFI engines. Carburetted variants from the same era don’t use a TPS. In Australia and New Zealand, most 1991 Swifts and rebadged Holden Barina MF/MH models were EFI, so a TPS is relevant and serviceable on these cars.

On a 1991 Suzuki Swift with EFI, the throttle-position-sensor sits on the throttle body and tells the ECU exactly how far the driver’s opened the throttle. That live signal helps the ECU trim fuel and ignition timing for crisp response, steady idle, clean overrun fuel cut, and better cold-start manners. On autos, it also influences shift quality. When the TPS is healthy, the Swift feels eager off the line and smooth through the revs, when it isn’t, it can bog, surge, or chew more petrol than it should.

Common clues the TPS needs attention include a flat spot on take-off, hesitation when blipping the throttle, hunting idle, high fuel use, a lingering fuel smell, or harsh/late shifts on automatic models. The check-engine lamp may flick on and the ECU can store a TPS-related fault.

As part of regular servicing, it’s smart to give the TPS and throttle body a once-over every 20,000–30,000 kilometres. Keep the connector clean and snug, inspect the loom for brittle insulation, and make sure the throttle plate isn’t gummed up. If readings look off, a multimeter check of the TPS sweep usually shows about half a volt closed and 4–4.5 volts at wide open, with a smooth climb in between. Many sensors on this era sit on slotted mounts, so they can be adjusted to set the idle switch/base voltage per the manual.

If replacement’s on the cards, go for an OE-quality TPS and a fresh gasket if required. Fit it carefully, align the tang with the throttle shaft, torque the screws evenly, then set the base position. Clear any stored codes, reset the ECU if applicable, and take it for a road test to confirm tip-in feels clean and idle is rock solid. A few extra minutes here saves headaches down the track.

• Quick tips: avoid water ingress at the connector, don’t overtighten the mounting screws, and recheck idle speed and throttle cable free-play after work.

FAQs

Where is the TPS on a 1991 Suzuki Swift?
The TPS is bolted to the side of the throttle body, opposite the throttle cable linkage. It has a 3‑wire plug (some variants add an idle switch circuit) and rotates with the throttle shaft. Access is under the bonnet on the intake side of the engine, removing the intake duct makes it easy to reach.

How do you tell if the TPS is faulty on this model?
Look for hesitation on light throttle, uneven idle, and higher-than-normal fuel use. A scan or blink-code check may reveal a TPS fault. A multimeter test for a smooth voltage sweep from closed to wide open throttle is the go-to diagnostic, any dead spots or sudden jumps indicate it’s time to replace or adjust.

Do carburetted 1991 Swifts use a TPS?
Carburetted versions don’t generally use a TPS. Some markets had simple throttle switches for emissions control, but the proper potentiometer-style TPS is specific to EFI engines. If your 1991 Swift is EFI (common in AU/NZ), it will have a TPS on the throttle body.