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Home >> Toyota >> 2001 >> Sienna CE >> Repair and Diagnosis >> External Pages >> Different car >> Section 198 (Engine Controls - Self-Diagnostics) >> Diagnostic Tests >> DTC P0451, DTC P0452 Or DTC P0453 >> Diagnostic Aids

Diagnostic Aids

WARNING: This page is about a different car, the 2003 Lexus GX 470. However, it is still accessible from the selected car via links, so may be relevant.
  1. If different DTCs are output simultaneously, ECM terminal E2 (sensor ground) may be open.
  2. If DTC P0441 (purge flow), P0446 (VSV for CCV), P0451, P0452 or P0453 (evaporative pressure sensor), is output with DTC P0442 or P0456, first troubleshoot DTC P0441, P0446, P0451, P0452 or P0453. It no malfunction is detected, troubleshoot DTC P0442 or P0456 next.
  3. Read freeze frame data using hand-held tester or OBD-II scan tool, as freeze frame data records engine conditions when a malfunction is detected. When troubleshooting, this is useful for determining whether vehicle was running or stopped, engine was warmed up or not, or air-fuel ratio was lean or rich at time of malfunction.
  4. When ENGINE RUN TIME in freeze frame data is less than 200 seconds, carefully check vapor pressure sensor.
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