Parts for your 2007 Toyota Crown-Map sensor

2007 Toyota Crown MAP sensor: what it does and how to look after it

Based on Toyota technical literature, the 2007 Toyota Crown range (GRS18x/UZS18x) is fitted with a manifold absolute pressure (MAP) sensor. Toyota often labels it “Vacuum Sensor” in the Crown’s Repair Manual (Engine Control – SFI/D-4 sections) and in the Electrical Wiring Diagram, where it’s shown wired to the ECU on VC (5 V), VPA (signal) and E2 (earth). Toyota’s Electronic Parts Catalogue for the GR-series petrol engines (4GR‑FSE/3GR‑FSE/2GR‑FSE) also lists a manifold pressure/vacuum sensor under the 89421‑xxxxx part family. So yes—this Crown uses a MAP sensor alongside its MAF sensor.

On a 2007 Crown, the MAP sensor reads intake manifold pressure in real time so the ECU can nail fuel delivery and ignition timing under changing load. Even though the GR engines lean on a MAF as the primary air‑measurement device, the MAP sensor adds accuracy during throttle transitions, helps with EGR and evap diagnostics, and provides a fallback strategy if the MAF goes crook. It’s a small solid‑state sensor mounted on the intake plenum (near the throttle body on V6 GR engines), sealed with an O‑ring.

There’s no scheduled replacement interval for the MAP sensor, but it’s smart to check it during major services. Under the bonnet, make sure the connector is clean and pinned firmly, and that the O‑ring isn’t flattened or torn. If the engine bay sees a lot of oil mist, a light hit with sensor‑safe electronics cleaner on the port (no poking with tools) can help. With a scan tool, a healthy sensor typically shows around 100–101 kPa key‑on/engine‑off, and roughly 25–40 kPa at hot idle at sea level, odd readings suggest testing the 5 V reference and earth before blaming the sensor.

• Common symptoms of a dodgy MAP: rough idle, hard starting, pinging, black smoke, flat spots, poor fuel economy, and DTCs P0105–P0108.
• Replacement tips: disconnect the battery, unplug the connector, remove the retaining fastener, swap the O‑ring for a new one, seat the sensor squarely, and tighten to the factory spec. Clear codes and verify live data.

For most Crowns, a clean connector, intact O‑ring, and a quick scan‑data check at service time keeps the MAP sensor happy for the long haul—easy as.

Popular questions

Where is the MAP sensor on a 2007 Toyota Crown?
On GR‑series V6 models it sits on the intake plenum near the throttle body, secured by a single bolt and sealed with an O‑ring. Some V8 variants position the “Vacuum Sensor” on the upper manifold. If in doubt, follow the harness from the throttle body area or check the engine cover labels.

Does the 2007 Crown use both a MAF and a MAP sensor?
Yes. The MAF does the heavy lifting for air‑mass measurement, while the MAP (vacuum) sensor refines load calculations during quick throttle changes, supports EGR/evap checks, and gives the ECU a plan B if the MAF signal is unreliable.

Can the MAP sensor be cleaned instead of replaced?
Often, yes. If contamination is mild, a careful spray with sensor‑safe electronics cleaner can restore accurate readings. Avoid harsh solvents and don’t poke the sensing port. If fault codes or weird readings persist after checks of power/earth and wiring, replacement is the go.