Parts for your 1999 Toyota Crown-Map sensor

1999 Toyota Crown MAP sensor — does this model use one?

Yes, the 1999 Toyota Crown (S170 series) uses a MAP sensor across its common engine options. Toyota’s Electronic Parts Catalog for S170 frames (e.g., JZS17x/GS171/GXS155) lists a “Sensor, Manifold Absolute Pressure” on applicable variants, and the Toyota workshop manuals for these engines include diagnostics for MAP-related DTCs (P0105–P0108), identifying the sensor in engine control wiring diagrams. Denso’s application catalogues also match Crown S170 engines (including 1JZ-FSE/2JZ-FSE direct-injection and the Athlete V’s 1JZ-GTE) to a MAP sensor. These technical references confirm the part is fitted and used for load calculation, boost control (turbo models), and barometric correction.

The Crown’s MAP sensor reads the absolute pressure in the intake manifold so the ECU can figure out engine load. That’s the heartbeat for fuelling, ignition timing and, on VVT-i and D-4 direct-injection variants, the fine trim that keeps them smooth and efficient. On the Athlete V turbo, it also acts as the boost reference, helping the ECU manage boost and cut if things get out of hand. Even models that also run a MAF still rely on the MAP for transient response, EGR checks and altitude correction.

As part of regular servicing, it’s smart to give the MAP setup a once-over every 30–40,000 km. The big failure point is usually the small vacuum hose or the port getting gummed up with oil mist. A split hose or blocked port can mimic a dead sensor. Pop the hose off, check for cracks, and make sure the manifold port is clear. If cleaning is needed, a gentle spray of electronics-safe cleaner on the port is fine, don’t soak the sensor or poke the sensing element.

Symptoms of a crook MAP include a rough idle, flat spots, sluggish performance, higher fuel use, sooty exhaust, or the check engine light with codes like P0105–P0108 or P0069. A quick scan-tool check helps: key-on/engine-off should read close to local barometric pressure, at idle it should drop noticeably, a sharp throttle blip should push readings up smoothly. If it doesn’t, and the hose and connector look good, it’s time to replace the sensor.

Replacement is typically a simple unplug-and-two-bolts job on the manifold. Use a quality OEM-equivalent (Denso) sensor, snug it down per the workshop manual, clear any codes and let the ECU relearn. Always rule out vacuum leaks before condemning the sensor—leaks will send the readings off and chase you in circles.

• Check: hose integrity, clean port, secure connector
• Test: scan live data for plausible kPa values
• Replace: if readings are out-of-range or contaminated

Technical sources referenced: Toyota Electronic Parts Catalog (S170 Crown), Toyota Repair Manuals for JZ-series and FSE engines covering DTC P0105–P0108 MAP diagnostics, Denso aftermarket application catalogues for Toyota Crown S170.

Popular questions about 1999 Toyota Crown MAP sensors

Where is the MAP sensor on a 1999 Crown?
It’s mounted on or near the intake manifold plenum. On most naturally aspirated variants it bolts directly to the manifold, on turbo Athlete V models it may sit on a bracket with a short vacuum hose to the manifold. Look for a small black sensor with a three-pin plug and a port or hose nipple.

Can a MAP sensor be cleaned, or should it be replaced?
Light oil film in the port can be cleaned with electronics-safe cleaner, but avoid flooding the sensor or touching the sensing element. If it’s water damaged, reads implausibly on a scan tool, or keeps throwing P0105–P0108 after hose and port checks, replacement is the reliable fix.

What fault codes point to a MAP issue on this model?
Common MAP-related codes are P0105 (MAP circuit malfunction), P0106 (range/performance), P0107 (low input), P0108 (high input), and sometimes P0069 (MAP–BARO correlation). Fuel trim or rich/lean codes can also pop up if the MAP data is off due to a leak or sensor fault.