DTC P0451, DTC P0452 & DTC P0453: Notes

WARNING: This page is about a different car, the 2003 Toyota 4Runner. However, it is still accessible from the selected car via links, so may be relevant.

Code Definition

DTC P0451: EVAP Emission Control System Pressure Sensor/Switch Range/Performance
DTC P0452: EVAP Emission Control System Pressure Sensor/Switch Low Input
DTC P0453: EVAP Emission Control System Pressure Sensor/Switch High Input

CAUTION: If Engine Control Module (ECM) replacement is instructed in following test, always ensure ECM electrical connectors and ground circuits are okay. If either are defective, repair and repeat testing to confirm ECM malfunction. On models equipped with engine immobilizer, if ECM is replaced, ECM must be programmed with proper ignition key code for engine immobilizer system. For programming procedures, see COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION, or appropriate ENGINE IMMOBILIZER SYSTEMS article in ACCESSORIES & EQUIPMENT.

NOTE: If DTCs related to MAF, IAT, TPS, ECT, VPS, HO2S and/or A/F sensor are output simultaneously, the E2 sensor ground circuit at ECM 34-pin connector E4 terminal No. 28 (Brown wire) may be open. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. For ECM connector terminal identification, see Figure.

NOTE: If DTCs P0441 (Purge Flow), P0446 (VSV for CCV), P0451, P0452 or P0453 (Evaporative Pressure Sensor) is output with DTCs P0442 or P0456, troubleshoot DTCs P0441, P0446, P0451, P0452 or P0453 first. If no malfunction is detected, troubleshoot DTCs P0442 or P0456 next.