• | 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 | Open | Short to Voltage |
---|---|---|---|
Operating Conditions: Engine operating in Closed Loop. Parameter Normal Range: 0.60-0.80 Volts | |||
Ignition 1 Voltage | 0.71 Volts | -- | -- |
5-Volt Reference | 0.71 Volts | 0.01 Volts | 1.56 Volts |
EGR Position Sensor Signal | 0.01 Volts | 5.00 Volts | 5.00 Volts* |
EGR Solenoid Control | 3.78 Volts | -- | * |
Low Reference | -- | 5.00 Volts | -- |
* Internal ECM damage may occur if the circuit is shorted to B+ |
Voltage is provided to the exhaust gas recirculation (EGR) valve by the ignition 1 voltage circuit through a fuse. Ground is provided to the EGR valve on the control circuit by a low side driver within the engine control module (ECM). The ECM monitors the voltage on the control circuit of the EGR valve to determine if a failure is present.
The engine control module (ECM) monitors the position of the EGR valve through the EGR valve position sensor. The EGR valve position sensor sends a feedback voltage on the signal circuit to the ECM. The EGR position sensor voltage varies depending on the position of the EGR valve.
• | DTCs P0107, P0108, P0112, P0113, P0117, P0118, P0122, P0123, P0131, P0300, P0335, P0336, P0341, and P0342 are not set. |
• | The engine is operating in closed loop. |
• | The ignition 1 voltage is more than 10 volts. |
• | The intake air temperature (IAT) sensor is more than 15°C (59°F). |
• | The engine coolant temperature is more than 60°C (140°F). |
• | The manifold absolute pressure (MAP) is more than 75 kPa. |
• | The engine airflow is between 71-174 mg/tdc. |
• | The engine speed is between 1,950-2,600 RPM. |
• | The DTC runs continuously when the above conditions are met. |
• | DTCs P0112, P0113, P0405, P0406, and P0501 are not set. |
• | The startup engine coolant temperature is more than 10°C (50°F). |
• | The engine coolant temperature is more than 65°C (149°F). |
• | The ignition voltage is between 11-15.8 volts. |
• | The intake air temperature (IAT) is between 3-120°C (37-248°F). |
• | The air fuel ratio is more than 14.5:1. |
• | The DTC runs continuously when the above conditions are met. |
• | The engine is running. |
• | The ignition voltage is between 11.7-16 volts. |
• | The DTC runs continuously when the above conditions are met. |
• | DTCs P0112, P0113, P0405, P0406, and P0501 are not set. |
• | The engine is running |
• | The ignition voltage is between 11.7-16 volts. |
• | The intake air temperature (IAT) is more than 3°C (37°F). |
• | The DTC runs continuously when the above conditions are met. |
The ECM detects an open, short to ground or voltage on the control circuit of the EGR valve.
The ECM detects the learned position of the EGR pintle position is out of range.
The ECM detects that the EGR position sensor voltage is less than 0.16 volts for 10 seconds.
The ECM detects that the EGR position sensor voltage is more than 4.90 volts for 10 seconds.
The ECM detects the difference between the actual EGR position and the learned EGR position is greater than 10 percent.
DTCs P0403, P0404, P0405, P0406, P1403, and P1404 are Type B DTCs.
DTCs P0403, P0404, P0405, P0406, P1403, and P1404 are Type B DTCs.
Exhaust Gas Recirculation (EGR) System Description
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Control Module References for scan tool information
⇒ | If the test lamp does not illuminate, test the ignition 1 voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal and the ignition 1 voltage circuit fuse is open, test all components connected to the ignition 1 voltage circuit and replace as necessary. |
⇒ | If the test lamp is always ON, test the control circuit for a short to ground. If circuit tests normal, replace the ECM. |
⇒ | If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If circuit tests normal, replace the ECM. |
⇒ | If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM. |
Important: The 5-volt reference circuits are internally and externally connected at the ECM. Other component DTCs may be set. If other DTCs are set, review the electrical schematic and diagnose the applicable circuits and components.
⇒ | If less than the specified range, test the 5-volt reference circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the ECM. |
⇒ | If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the ECM. |
⇒ | If less than the specified range, test the signal circuit for a short to ground. If the circuit tests normal, replace the ECM. |
⇒ | If greater than the specified range, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM. |
Important: The EGR must be near 20°C (68°F) in order for an accurate measurement.
⇒ | If not within the specified range, replace the EGR valve. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for engine control module replacement, setup, and programming |