DTC: P0402

Search Bulletins/Recalls for P0402

Trouble diagnosis name: EGRC-BPT Valve Function

Diagnosis Logic

The ECM monitors the switching frequency ratio of heated oxygen sensors 1 and 2.

If too much EGR flow exists due to an EGRC-BPT valve malfunction, off idle engine roughness will increase. If the roughness is large, then the vacuum to the EGR valve is interrupted through the EGRC solenoid valve. If the engine roughness is reduced at that time, the EGRC-BPT valve malfunction is indicated.

DTC detecting condition:

• The EGRC-BPT valve does not operate properly.

Possible cause:

• EGRC-BPT valve may be faulty
• EGR valve
• Misconnected rubber tube
• Blocked rubber tube
• Camshaft position sensor
• Blocked exhaust system
• Mass air flow sensor
• EGRC-solenoid valve