Parts for your 1991 Suzuki Swift-Camshaft sensor

1991 Suzuki Swift camshaft sensor — what’s actually fitted

Short answer: a separate camshaft position sensor (CMP) isn’t used on the 1991 Suzuki Swift. These cars run a distributor-based ignition system, and the engine control unit takes its timing and reference signals from a pickup inside the distributor (often called a crank angle sensor/CAS or an ignition pickup), not from a stand-alone cam sensor on the head.

Technical sources back this up. The 1991 Suzuki Swift Service Manual wiring diagrams show a distributor with an internal signal generator (magnetic on SOHC models, optical on the GTi DOHC) providing engine position, with no separate CMP circuit. The Suzuki Electronic Parts Catalogue for 1989–1994 Swift models lists no camshaft position sensor as a distinct part. Gregory’s/Haynes publications for Swift/Geo Metro of the same era, plus the factory manuals for the related Geo Metro/Cultus, describe and test the distributor pickup/CAS and igniter, but do not specify a separate cam sensor. Parts systems sometimes mislabel the distributor CAS as a “cam sensor”, but it isn’t a standalone sensor on the head, it’s built into the distributor.

Why there’s no CMP on this model year comes down to design. Early EFI Swifts use:

• G10 1.0 SOHC: distributor with magnetic pickup (no separate cam sensor)
• G13A/G13BA 1.3 SOHC: distributor with magnetic pickup (no separate cam sensor)
• G13B 1.3 DOHC GTi: distributor with optical CAS (still no separate cam sensor)

The distributor is driven off the cam, so the ECU already gets engine position and reference pulses from a cam-driven source. With batch or semi-sequential fuel strategies of the time, there was no need for a dedicated cam phasing signal. Fewer components, simpler wiring, and easier servicing.

If the car has no-spark, misfire, or erratic timing, the usual suspects are the distributor internals, not a missing CMP. Practical checks include:

• Condition of cap, rotor, and leads
• Distributor pickup/CAS output and the igniter/module
• Base timing set-up (jumper diagnostic connector, then set timing)
• Timing belt alignment on G10/G13 engines
• ECU fault codes via OBD1 blink method

Bottom line: ordering a “camshaft sensor” for a 1991 Swift will usually get you the wrong part. Look for distributor/CAS components or a replacement distributor to sort ignition reference issues.

Popular questions

Does any 1991 Suzuki Swift variant actually have a cam sensor?

No separate, head-mounted camshaft position sensor is used on 1991 models. Even the GTi’s G13B DOHC uses an optical crank angle sensor inside the distributor. Some catalogues call that a cam sensor, but it’s part of the distributor assembly rather than a standalone CMP.

Where is the engine position “sensor” on a 1991 Swift, then?

Inside the distributor. On SOHC engines it’s a magnetic pickup, on the GTi DOHC it’s an optical encoder. If you’re chasing timing or no-start issues, you’ll be testing or replacing the distributor pickup/CAS, the igniter, or the complete distributor, plus checking cap/rotor and wiring.

I’m doing an engine/ECU swap — will I need a cam sensor?

Possibly. Later engines or aftermarket ECUs running full sequential injection usually want a dedicated cam phase signal. You can often use the existing distributor CAS as a cam signal, or fit a cam trigger kit to suit the ECU’s requirements.