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Home >> Toyota >> 2000 >> RAV4 Base, AWD, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 21 (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 2000 Toyota Celica. However, it is still accessible from the selected car via links, so may be relevant.
  1. Access ECM in driver's side of engine compartment, next to battery. Turn ignition on. Using DVOM, backprobe ECM harness connector and measure voltage between terminals No. 2 (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 not as specified, replace ECM. If voltage is as specified, go to next step.
  2. Using DVOM, backprobe ECM harness connector and measure voltage between terminal No. 4 (Blue/Black wire) at ECM harness connector E2 and terminal No. 18 (Brown wire) at ECM harness connector E4. Remove fuel cap. Turn ignition on. Voltage should be 3.3 volts. 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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