Diagnose Nissan 350Z crank-no-start

The short answer

When a Nissan 350Z cranks normally but the engine never fires, the starter and battery are usually doing their job. The engine is missing at least one of the things it needs to run: fuel, spark, correct timing signals, or permission from the anti-theft system. The most practical way forward is to work out which of these is missing before replacing anything. A few observations make this much easier: the security light, any stored fault codes, whether the fuel pump primes, and whether the tachometer moves while cranking.

Scope: this guide covers the Z33-generation 350Z sold from roughly the 2003 to 2009 model years, depending on market. Most cars use the VQ35DE V6. Later manual-transmission cars in some markets use the revised VQ35HR. The diagnostic logic is the same for both. Sensor locations, connector details, fuel pressure specifications and test procedures can differ by engine and model year, and no specifications were supplied for this article. Confirm any values against the factory service manual for your exact car.

First, confirm it is a true crank-no-start

A true crank-no-start means the engine turns over at a normal, steady speed but does not catch. Rule out two other situations first, because they point to different problems:

Slow, labored or intermittent cranking points first to the battery, its terminals, ground straps or the starter circuit. Low voltage during cranking can also starve the ignition and engine computer, so a weak battery can look like a no-start fault. If the engine starts briefly and then dies within a second or two, that often points toward the immobilizer, a fuel delivery problem, or an air metering fault. Note exactly how long it runs before it stalls.

Check 1: The security indicator (immobilizer)

The 350Z uses the Nissan Anti-Theft System (NATS), an immobilizer that only lets the engine run when it recognizes a registered key. Watch the security indicator on the dash with the ignition on. If it stays lit or behaves differently from its normal pattern, the system may not be recognizing the key.

Try a spare key if you have one. If the spare works, the original key's transponder or its battery is the likely suspect. If neither key works and the security indicator stays abnormal, the fault may be in the antenna around the ignition, the wiring, or the control modules. Diagnosing that usually needs a dealer-level scan tool or an experienced specialist. The normal indicator behavior and the key registration procedure vary by model year and market, so check your owner's manual for what is normal on your car.

Check 2: Read the fault codes

Connect an OBD-II scanner and read both stored and pending codes. Some faults that prevent starting are recorded during cranking, so a scan is worthwhile even if the check-engine light is not on.

Codes most relevant to a crank-no-start include P0335 (crankshaft position sensor circuit) and P0340/P0345 (camshaft position sensor circuits). Codes for the fuel pump circuit, the engine computer's power supply, or the immobilizer also matter. A code is evidence, not a verdict. A crankshaft sensor code can come from the sensor itself, but also from a damaged connector, chafed wiring, metal debris on the sensor tip, or a problem with the toothed reluctor ring it reads. Check the wiring and connector before buying parts.

Check 3: Listen for the fuel pump

With the cabin quiet, turn the ignition on without cranking. On most cars you should hear the in-tank fuel pump run briefly as it pressurizes the system. A helper standing near the rear of the car, or someone listening close to the fuel tank area, can make this easier to hear.

Pump heard: the pump circuit is at least being switched on. This does not prove the pump delivers enough pressure. Pump not heard: check the relevant fuse and relay first. Then check for power and ground at the pump connector while the pump is being commanded on. A pump that has power and a good ground but does not run is likely faulty. If no power reaches the pump, the cause is upstream: fuse, relay, power distribution module, wiring, or the engine computer not commanding it. Inconclusive: some pumps are hard to hear. A fuel pressure test is the definitive check.

Fuel pressure testing on this car can be awkward, because the method depends on the fuel line fittings and whether a test port is present. The correct pressure specification and test procedure should come from the service manual for your model year. This guide does not give a figure because none was supplied in the source material.

Check 4: Watch the tachometer while cranking

Many owners and technicians use the tachometer as a quick indicator. If the needle rises slightly while the engine cranks, the engine computer is probably receiving a crankshaft speed signal. If the needle stays flat at zero during normal cranking, a missing crankshaft position signal becomes a stronger suspect. That fits with a P0335 code if one is present.

Treat this as a heuristic, not a test result. It depends on how the instrument cluster receives its signal on your car, and a flat needle can also come from a cluster or communication fault. Confirm with codes, live data or a direct sensor test.

Check 5: Spark and injector activity

If fuel delivery seems normal and no sensor codes are present, check for spark. The 350Z uses individual ignition coils, one per cylinder. A single failed coil usually causes a misfire, not a complete no-start. No spark on every cylinder points to something they all share: coil power supply, the crank or cam signal, or the engine computer.

Use an inline spark tester rather than grounding a plug by hand. Removing coils on the rear bank requires taking off the intake plenum on this engine, so start with the front bank. A noid light, or a scope on the injector connectors, can confirm whether the injectors are being pulsed.

Quick reference: what each result suggests

Observation | Most likely direction | Next step; Security indicator abnormal, spare key works | Key transponder or key battery | Use the spare; replace or re-register the faulty key; Security indicator abnormal, no key works | Immobilizer antenna, wiring or modules | Dealer or specialist with Nissan-capable scan tool; P0335 or P0340/P0345 stored | Crank or cam signal circuit | Inspect connector and wiring, then test the sensor; Tach flat during cranking | Possible missing crank signal | Confirm with codes or live data; No fuel pump prime | Fuse, relay, wiring or pump | Check fuse and relay, then power and ground at the pump; Pump primes but still no start | Low pressure, no spark or no injector pulse | Fuel pressure test, spark test, injector pulse test; Strong fuel smell, engine won't catch | Flooding or a fuel leak | Stop cranking and inspect for leaks before continuing; Fuel recently added or car stored a long time | Contaminated or stale fuel | Inspect a fuel sample; drain if needed

Less common causes

If the checks above all pass, consider the causes that require deeper diagnosis:

Mechanical timing faults, such as a worn timing chain guide or tensioner. Rattling from the front of the engine before the no-start is a warning sign. Low compression. A heavily restricted exhaust. A failed engine computer or a loss of its power supply. These usually need compression testing, cam and crank correlation checks on a scan tool, or a scope. Professional diagnosis is often the most cost-effective route at this stage.

When to stop and seek professional help

Stop immediately if you smell raw fuel strongly or see any fuel leak. Do not keep cranking, and do not create sparks near the leak. Crank in short bursts with rest periods. Long cranking can overheat the starter and drain the battery. It can also push unburned fuel into the exhaust, which risks damaging the catalytic converters. If you hear grinding, clattering or irregular cranking sounds, stop. These can indicate starter engagement problems or internal engine damage. Get professional help if the immobilizer is implicated and no key works, if timing correlation codes appear, or if new sensors do not change the symptom.

Gaps in this guide

No model-year-specific specifications, test values, recall details or measured findings were supplied for this article. Fuel pressure figures, sensor resistance or signal values, fuse and relay positions, and immobilizer indicator patterns are therefore not given here. Take those from the factory service manual for your exact year and engine. A VIN check with a Nissan dealer will also show whether any open recalls or service campaigns apply to your car.