• | 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 | 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 |
• | DTCs P02E0, P02E8, P02E9, P0642 or P0643 are not set. |
• | DTC P02E7 runs continuously while the IA valve is actively being controlled. |
The difference between the desired IA Valve position and the actual IA Valve position is more than 3 percent for 10 seconds.
• | DTC P02E7 is a Type B DTC. |
• | Diesel particulate filter (DPF) regeneration is inhibited. |
DTC P02E7 is a Type B DTC.
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Measure the following circuits for high resistance:
• | Low reference circuit |
• | Signal circuit |
⇒ | If high resistance is found, repair the affected circuit. |
⇒ | If no resistance is found, replace the IA valve. |
• | Refer to Control Module References for ECM replacement, setup and programming. |