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Home >> Toyota >> 2002 >> RAV4 Base, AWD, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 11 (Engine Control System Self-Diagnostics) >> 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 2002 Toyota MR2. However, it is still accessible from the selected car via links, so may be relevant.
  1. Access ECM on driver's side of firewall behind driver's seat, luggage compartment lids and partition board. See Figure. Turn ignition on. Using DVOM, backprobe ECM harness connector and measure voltage between terminals No. 2 (Blue/Red wire) and No. 18 (Brown wire) at ECM harness connector E4. See Figure. Voltage should be 4.5-5.5 volts. If voltage is as specified, go to next step. If voltage is not as specified, replace ECM.
  2. Using DVOM, backprobe ECM harness connector and measure voltage between terminal No. 4 (Green/Black wire) at ECM harness connector E2 and terminal No. 18 (Brown wire) at ECM harness connector E4. Remove fuel tank cap. Turn ignition on. Voltage should be 3.0-3.6 volts. If voltage is not as specified, go to next step. If voltage is as specified, replace ECM.
  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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