Possible Causes

Malfunction is detected when EGRC-BPT valve does not operate properly. Possible causes are:

Defective EGRC-BPT valve.
Defective EGR valve.
Backpressure hose disconnected, blocked or leaking.
Defective Camshaft Position (CMP) sensor.
Plugged exhaust.
Missing orifice in hose between EGRC-BPT valve and EGRC solenoid valve.
Defective Mass Airflow (MAF) sensor.
Defective EGRC solenoid valve.

NOTE: Before proceeding, ensure battery voltage is more than 11 volts at idle.