• | 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 provides an overview of each diagnostic category. |
Circuit | Short to Ground | High Resistance | Open | Short to Voltage |
---|---|---|---|---|
IA Flow Valve 5-Volt Reference Voltage | P0642 | P02E9 | P02E8 | P0336, P0643 |
IA Flow Valve Sensor Signal | P02E8 | P02E7 | P02E8 | P02E9 |
IA Flow Valve Low Reference | -- | P02E7 | P02E8, P02E9 | -- |
IA Flow Valve Motor Control 1 | P02E0 | -- | P02E0 | P02E0 |
IA Flow Valve Motor Control 2 | P02E0 | -- | P02E0 | P02E0 |
The intake air (IA) valve is a normally open valve and is only operated during a DPF regeneration. The position of the IA valve is controlled by the engine control module (ECM). The IA valve system uses a position sensor located within the valve assembly to monitor the position of the valve. The position sensor has the following circuits:
• | 5-volt reference circuit |
• | Low reference circuit |
• | Signal circuit |
The IA valve uses a motor to move the valve to a closed position and spring tension returns it to the open position. The motor has the following circuits:
• | Motor control 1 circuit |
• | Motor control 2 circuit |
• | The ECM is powered up for more than 0.5 second. |
• | The IA valve duty cycle is greater than 10 percent. |
• | DTC P02E0 runs continuously. |
• | The IA valve duty cycle is greater than 10 percent. |
• | The IA valve control circuit is less than 25 mA. |
• | DTC P02E0 is a Type B DTC. |
• | Diesel particulate filter (DPF) regeneration is inhibited. |
DTC P02E0 is a Type B DTC.
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
• | Command the IA valve from 100 percent to 0 percent. The IAF Valve Commanded Position and the IAF Valve Position parameter should match. |
• | After the engine has been running, turn OFF the ignition. Observe the IA Valve Position parameter fluctuates between 0 percent and 100 percent several times. |
• | 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 data. |
• | IA Motor Control 1 |
• | IA Motor Control 2 |
⇒ | If a condition is found repair the affected circuit. |
• | IA Motor Control 1 terminal A |
• | IA Motor Control 2 terminal B |
⇒ | If voltage is less than 12 volts on either circuit, replace the ECM. |
⇒ | If the voltage is 12 volts on both circuits, replace the IAF valve. |
• | Control Module References for ECM replacement, setup and programming. |