Test Description

WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers on the diagnostic table.

5: This step tests for high resistance in reference voltage circuit. If the test lamp does not illuminates at all, there is excessive resistance in the 5-volt reference circuit or low reference ground circuit.
8: This step tests for high resistance in the EGR solenoid control circuit and ground circuits. The PCM provides a 12 volt bias signal on the solenoid control circuit that is pulled low when the solenoid is OK and has a good ground. If the circuit resistance is OK, the DMM should measure ignition voltage.
19: After replacing the PCM a new minimum throttle position and idle speed must be established.

DTC P0404

Step	Action	Values	Yes	No
Connector End View Reference: Powertrain Control Module Connector End Views or Engine Controls Connector End Views
1	Did you perform the Diagnostic System Check - Vehicle?	-	Go to Step 2	Go to Diagnostic System Check - Vehicle
2	Is DTC P0403 or P0406 also set?	-	Go to DTC P0403 or DTC P0406	Go to Step 3
3	Start the engine. Run the engine until the engine coolant temperature is at least 85°C (185°F). With the scan tool, command the EGR valve from 0 to 50 percent while observing the EGR Sensor data parameter. Refer to Scan Tool Output Controls . Command the EGR valve from 50 percent to 100 percent while observing the EGR sensor. Was the exhaust gas recirculation (EGR) Sensor voltage within the first specified value when at 50 percent and within the second specified value when at 100 percent?	2.10-2.20 V 3.10-3.20 V	Go to Step 4	Go to Step 5
4	Observe the Freeze Frame/Failure Records data for this DTC. Turn OFF the ignition for 30 seconds. 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. Did the DTC fail this ignition?	-	Go to Step 5	Go to Diagnostic Aids In This Test
5	Disconnect the EGR valve electrical connector. Turn ON the ignition, with the engine OFF. Connect the J 35616-200 Test Lamp between the 5-volt reference circuit of the EGR position sensor and the low reference circuit of the position sensor. See Special Tools . Does the test lamp illuminate at least dimly?	-	Go to Step 6	Go to Step 7
6	Connect a 3-amp fused jumper wire between the 5-volt reference circuit of the EGR position sensor and the sensor signal circuit. Observe the EGR Sensor parameter on the scan tool. Is the EGR sensor voltage near the specified value?	4.96 V	Go to Step 8	Go to Step 12
7	Connect the test lamp between the 5-volt reference circuit of the EGR valve and a good ground. Does the test lamp illuminate at least dimly?	-	Go to Step 11	Go to Step 13
8	At the EGR valve electrical connector, connect a DMM between the EGR solenoid control circuit and the EGR solenoid ground circuit. Turn ON the ignition, with the engine OFF. Is the voltage near the specified value?	12 V	Go to Step 10	Go to Step 9
9	Connect the DMM between the EGR solenoid control circuit and a known good ground. Is the voltage near the specified value?	12 V	Go to Step 15	Go to Step 14
10	Remove the EGR valve. Refer to Exhaust Gas Recirculation Valve Replacement . Inspect the EGR valve pintle and seat area for foreign debris. Remove as necessary. Did you find and correct the condition?	-	Go to Step 20	Go to Step 16
11	Test the low reference circuit of the EGR position sensor for high resistance. Refer to Exhaust Gas Recirculation Valve Replacement . Did you find and correct the condition?	-	Go to Step 20	Go to Step 17
12	Test the EGR position sensor signal circuit for the following conditions: An open A short to ground High resistance Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition?	-	Go to Step 20	Go to Step 17
13	Test the 5-volt reference circuit of the EGR position sensor for an open or for high resistance. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition?	-	Go to Step 20	Go to Step 17
14	Test the control circuit of the EGR valve for resistance. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition?	-	Go to Step 20	Go to Step 17
15	Repair the condition of high resistance in the ground circuit of the EGR valve. Refer to Circuit Testing and Wiring Repairs . Did you complete the repair?	-	Go to Step 20	-
16	Test for an intermittent and for a poor connection at the EGR valve. Refer to Testing for Intermittent Conditions and Poor Connections Connector Repairs . Did you find and correct the condition?	-	Go to Step 20	Go to Step 18
17	Test for an intermittent and for a poor connection at the powertrain control module (PCM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition?	-	Go to Step 20	Go to Step 19
18	Replace the EGR valve. Refer to Exhaust Gas Recirculation Valve Replacement . Did you complete the replacement?	-	Go to Step 20	-
19	Replace the PCM. Refer to Control Module References for replacement, setup, and programming. Perform the idle learn procedure. Refer to Idle Learn . Did you complete the replacement?	-	Go to Step 20	-
20	Clear the DTCs with a scan tool. Turn OFF the ignition for 30 seconds. Start the engine. 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. Did the DTC fail this ignition?	-	Go to Step 2	Go to Step 21
21	Observe the Capture Info with a scan tool. Are there any DTCs that have not been diagnosed?	-	Go to Diagnostic Trouble Code (DTC) List - Vehicle	System OK