Parts for your 1990 Mitsubishi Pajero-Camshaft sensor

1990 Mitsubishi Pajero camshaft sensor — what’s actually fitted

For the 1990 Mitsubishi Pajero, a separate camshaft position sensor isn’t fitted or required. According to Mitsubishi’s Factory Service Manuals for 1989–1991 Montero/Pajero (Engine Electrical and EFI sections), these models use a distributor-based ignition setup with built-in trigger sensors (often described as TDC and crank angle signals) rather than a standalone camshaft sensor on the head. The Haynes Mitsubishi Pajero/Montero Repair Manual (1983–1996) echoes this, describing a distributor-driven pickup for petrol engines. For diesels, the Mitsubishi 4D56 engine manuals from this era specify a mechanical VE-type injection pump with gear-driven timing and no camshaft position sensing.

That’s why a “camshaft sensor” listing won’t be relevant to a 1990 Pajero. On the petrol variants (4G54 2.6 and early 6G72 3.0 V6), timing and phase information comes from the distributor. Depending on the engine, the distributor houses a reluctor pickup or an optical/hall unit that provides the ECU/ignition module with TDC and angle signals. It’s sometimes called a “crank angle sensor” or “cam angle sensor” in the distributor, but it’s not a separate camshaft sensor mounted to the engine. On the 4D56 diesel, fuelling and timing are handled mechanically by the pump, so there’s no camshaft sensor at all.

Because there’s no standalone camshaft sensor to replace, smart servicing on a 1990 Pajero focuses on the parts that actually do the job under the bonnet:

• Distributor items: cap, rotor, ignition pickup (reluctor/optical), and the ignition power transistor/module.
• Timing belt, tensioner and alignment marks (especially on the 6G72 and 4G54).
• Wiring and earths to the distributor and ECU—corrosion and brittle plugs cause intermittent no-spark faults.
• For 4D56 diesels: pump timing, belt condition, and any shaft play or leaks at the VE pump.

Typical symptoms that mimic a “bad cam sensor” on newer cars—hard starts, random stalling, rough idle, or a dead-spark no-start—are usually down to a tired distributor pickup, worn cap/rotor, a failing ignition module, or slipped timing. If it’s blowing out at higher kilometres, a quick check with a timing light and a look at the distributor internals often saves hours of guesswork. For OBD‑I petrol models, blink codes can still be pulled from the diagnostic connector, but they won’t point to a missing cam sensor because the system was never designed around one.

• Does a 1990 Mitsubishi Pajero have a camshaft sensor?
  Short answer: no separate camshaft sensor is used. The distributor provides the timing signals on petrol engines, and the 4D56 diesel uses a mechanical pump.
• What should be checked instead of a camshaft sensor?
  Distributor pickup (reluctor/optical), cap and rotor, ignition module/power transistor, timing belt alignment, and wiring/connectors. Diesel owners should confirm pump timing and belt condition.
• Why did Mitsubishi skip a standalone cam sensor on these?
  Because these trucks ran distributor ignition or mechanical diesel injection—sequential injection and coil-on-plug systems (which require a dedicated cam sensor) came later.