DTC P0401: Insufficient Exhaust Gas RECIRCULATION Flow Detected: Notes

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

NOTE: This DTC applies to 2.7L 3RZ-FE engine only.

CAUTION: If Engine Control Module (ECM) replacement is instructed in following test, always ensure ECM connectors and ground circuits are okay. If either are defective, repair and repeat testing to confirm ECM malfunction.