• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
• | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
• | Diagnostic Procedure Instructions provide an overview of each diagnostic category. |
The engine control module (ECM) tests the exhaust gas recirculation (EGR) flow when the EGR is in operation. EGR desired flow is compared to EGR actual flow. If EGR flow is higher than expected DTC P0402 will set.
• | DTCs P0016, P0027, P0079, P0080, P0101, P0102, P0103, P0112, P0113, P0117, P0118, P0126, P0201, P0202, P0203, P0204, P0205, P0206, P0261, P0264, P0267, P0270, P0273, P0276, P02E7, P02E8, P0335, P0336, P0401, P0403, P0404, P0409, P042E, P0500, P0506, P0507, P0602, P0642, P0643, P0652, P1125, P1293, P2002, P2100, P2146, P2147, P2148, P2149, P2150, P2151, P2227, P2228, P2229, P2545, P268A are not set. |
• | The following conditions are met for 6 seconds: |
- | The engine is running. |
- | The engine did not stall. |
- | The vehicle speed is between 0-410 km/h (0-255 mph). |
- | The barometric pressure (BARO) is between 75-120 kPa. |
- | The intake air temperature (IAT) is between -7 and +120°C (+20 and +248°F). |
• | The following conditions are met: |
- | The battery voltage is between 10-16 volts. |
- | The ignition is ON for longer than 2 seconds. |
- | The accelerator pedal position is less than 101 percent. |
- | The EGR control is ON. |
- | The engine coolant temperature (ECT) is between 58-95°C (136-203°F). |
- | The exhaust brake is OFF. |
• | The following conditions are met for 5 seconds: |
- | The exhaust throttle command is OFF. |
- | The intake throttle position is less than 55 percent. |
- | The DPF status is zero without the regeneration event. |
- | The DPF differential pressure is between -10 and +20 kPa. |
- | The VNT control is in normal mode. |
The actual mass air flow (MAF) value is less than the target MAF value.
DTC P0402 is a Type B DTC.
DTC P0402 is a Type B DTC.
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Control Module References for scan tool information
Important: If you cannot duplicate the condition, operate the vehicle within the conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.
⇒ | If the actual EGR position remains stationary, replace the EGR valve. |
Important: Perform the Circuit/System Verification before proceeding with the Circuit/System Testing.
Inspect the charge air cooler for leaks.
⇒ | If no condition is found, perform the component testing. |
⇒ | If the actual EGR position remains stationary replace the EGR valve. |
⇒ | If a leak is found replace the EGR valve gasket. |
⇒ | If the EGR valve is sticking, or is damaged, replace the EGR valve. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.