DTC P0451, DTC P0452 Or DTC P0453: Notes

WARNING: This page is about a different car, the 2003 Toyota Land Cruiser. 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 - TOYOTA article in GENERAL INFORMATION, or appropriate ENGINE IMMOBILIZER SYSTEMS article in ACCESSORIES & EQUIPMENT.

NOTE: If DTCs related to IAT sensor, HO2S, TP control motor and sensor, ECT sensor and VP sensor are output simultaneously, the E2 sensor ground circuit at terminal No. 28 (Brown/White wire) at ECM connector E5 may be open. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. For ECM electrical connector terminal identification, see Figure. It may be necessary to check Brown/White wire between splice E10 and terminal No. 28 at ECM connector E5. See Figure.

NOTE: If DTCs P0441, P0446, or P0451 is output with DTCs P0442 or P0456, perform appropriate test for these DTCs first before performing test for DTCs P0442 or P0456.