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Home >> Toyota >> 2000 >> RAV4 Base, AWD, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 10 (Engine Control System Self-Diagnostics - V6) >> Diagnostic Tests >> DTC P0450: EVAP Pressure Sensor Circuit, Or DTC P0451: EVAP Pressure Sensor Range/Performance >> Diagnosis & Repair
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Diagnosis & Repair

WARNING: This page is about a different car, the 2000 Toyota 4Runner. However, it is still accessible from the selected car via links, so may be relevant.
  1. Access ECM behind glove box. Turn ignition on. Using DVOM, backprobe ECM harness connector and measure voltage between terminals No. 2 (Green/Black wire) and No. 18 (Blue/Black wire) at ECM harness connector E10. See Figure. If voltage is not 4.5-5.5 volts, replace ECM. If voltage is 4.5-5.5 volts, go to next step.
  2. Using DVOM, backprobe ECM harness connector and measure voltage between terminal No. 17 (Yellow wire) at ECM harness connector E14 and terminal No. 18 (Blue/Black wire) at ECM harness connector E10. See Figure. Disconnect vacuum hose from vapor pressure sensor. Vapor pressure sensor is mounted on firewall, near brake booster. Connect a vacuum pump to vapor pressure sensor. Voltage should be 3.0-3.6 volts without vacuum applied, and .5 volt or less with 1.8 in. Hg applied. If voltage is as specified, replace ECM. If voltage is not as specified, go to next step.
  3. Check for open or short in wiring between vapor pressure sensor and ECM. See WIRING DIAGRAMS article. If problem exists, repair wiring as necessary. If problem does not exist, replace vapor pressure sensor.
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