Parts for your 2018 Isuzu D-max-Crank angle sensor

2018 Isuzu D‑Max crank angle sensor (crankshaft position sensor)

On the 2018 Isuzu D‑Max with the 4JJ1 3.0L common‑rail diesel, a crank angle sensor is absolutely fitted and relevant. Technical references including the Isuzu 4JJ1 Engine Workshop Manual, Bosch common‑rail diesel control literature, and independent service data (covering 2012–2020 D‑Max) all specify a crankshaft position sensor (often called a crank angle sensor or CKP). The engine control module relies on it for precise fuel injection timing and engine speed data.

The crank angle sensor’s job is to read a toothed wheel on the crank and feed the ECU exact crank position and RPM. That signal is paired with the cam sensor so the ECU knows which cylinder is on the power stroke, when to inject, and how to control idle and boost. If the signal drops out, you’ll usually get a no‑start, hard starting when hot, surging, or the MIL popping on and limp mode kicking in. On the D‑Max, a dodgy CKP can also make the tacho behave oddly at crank.

It’s not a routine replacement item, but it does deserve attention as part of scheduled servicing:

• Scan for stored fault codes (common CKP‑related DTCs include P0335/P0336). Clear and recheck after a road test.
• Visually inspect the sensor harness around the front/rear of the block for rub‑through, oil ingress, or heat damage. Check the connector pins for corrosion.
• If removed, look for metal filings stuck to the magnetic tip, that can distort the signal. Clean gently and refit if the sensor tests OK.
• When replacing, use a quality OEM‑spec sensor, lightly oil the O‑ring, and torque the retaining bolt to spec from the workshop manual. Keep the wiring clipped away from exhaust heat.
• After replacement, clear codes and start the engine from cold to let the ECU settle. A short drive cycle with a few steady‑state kilometres usually confirms all is well.

Owners often ask about “relearns” after fitting a CKP. The D‑Max ECU typically adapts without a special procedure, provided there are no other faults and battery voltage is healthy. If the MIL returns, recheck the air gap/spec, wiring integrity, and cam sensor correlation.

Bottom line: the crank angle sensor is a small part with a big say in how smoothly a 2018 D‑Max runs. Keeping the connector clean, the loom tidy, and replacing the sensor promptly if it plays up will save headaches and keep the ute pulling strongly under load.

Where is the crank angle sensor on a 2018 D‑Max?

It’s mounted to the engine block facing a toothed wheel on the crank. On many 4JJ1s it sits near the rear of the block reading the flywheel ring gear, though some variants position it at the front cover. Under the bonnet, follow the loom down from the engine harness, you’ll find a small two‑wire sensor held by a single bolt.

What are the common signs and fault codes of a failing CKP on a D‑Max?

Hard starting, intermittent stalling, uneven idle, limp mode, and the MIL are typical. Scan tools often show P0335 (Crankshaft Position Sensor Circuit) or P0336 (Range/Performance). Before condemning the sensor, check for wiring damage and oil contamination at the connector.

Does the D‑Max need a special relearn after replacing the crank angle sensor?

Generally, no special crank variation relearn is required on the 2018 D‑Max. Clear any codes, start and let it idle to operating temp, then take a short road test. If codes return, verify sensor seating, correct part number, and cam/crank signal correlation with a scan tool.