Mechanics

CHEVROLET VENTURE ENGINE PROBLEM

2001 Chevrolet Venture • 126,000 miles

Code pd410 what do I look for
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November 6, 2012.



DESCRIPTION
The control module activates the Secondary Air Injection (AIR) System by grounding both the pump relay and the vacuum control solenoid control circuits. This energizes the pump and the vacuum control solenoid. Vacuum is then applied, opening the shutoff valves. The pump then forces filtered fresh air into the exhaust stream in order to accelerate catalyst operation. The control module will run up to three diagnostic tests using the pre-catalyst Heated Oxygen Sensor (HO2S) voltage and Short Term FT to diagnose the system. The system can be diagnosed during normal secondary air injection operation or the control module can activate the system specifically for diagnostic purposes. If the system is operating properly the HO2S voltage with decrease and the Short Term FT will increase when the system is activated. If a system air flow problem is detected this Diagnostic Trouble Code (DTC) will set. When inactive, the system prevents air flow in either direction.

CONDITIONS FOR RUNNING THE DTC

DTCs P0102, P0103, P0107, P0108, P0112, P0113, P0117, P0118, P0121, P0122, P0123, P0125, P0131, P0132, P0133, P0134, P0135, P0137, P0138, P0140, P0141, P0171, P0172, P0440, P0442, P0443, P0446, P0449, P1106, P1107, P1111, P1112, P1114, P1115, P1121, P1122, P1133, P1134, or P1441 are not set.
The Engine Coolant Temperature (ECT) is between 4.4°C (40°F) and 110°C (230°F).
The start-up ECT is below 70°C (158°F).
The engine operates for more than 210 seconds. The Intake Air Temperature (IAT) is between 4.4°C (40°F) and 70°C (158°F).
The Short Term FT is between -3 and +4.
The engine load is between 24-37 percent.
The Manifold Absolute Pressure (MAP) is above 40 kPa.
The Barometric Pressure (BARO) is above 75 kPa.
The Mass Air Flow (MAF) is between 11-18.5 grams per second.
The engine speed is more than 1200 RPM.
The ignition voltage is between 10-18 volts.
The vehicle speed is more than 8 km/h (5 mph ).

CONDITIONS FOR SETTING THE DTC

The pre-catalyst HO2S voltage remains above a predetermined lean value during the test.

AND

The Short Term FT does not increase a calibrated amount during the test.
Both conditions above exist for 3 consecutive tests.

ACTION TAKEN WHEN THE DTC SETS

The control module illuminates the Malfunction Indicator Lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.

CONDITIONS FOR CLEARING THE MIL/DTC

The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
A current DTC "Last Test Failed" clears when the diagnostic runs and passes.
A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
Use a scan tool in order to clear the MIL and the DTC.

DIAGNOSTIC AIDS

Low system airflow can cause an intermittent complaint. Inspect for the following conditions: Pinched, kinked, restricted, or leaking pipes, hoses, or fittings
A restricted pump inlet hose, duct, or filter
Pinched, kinked, restricted, or leaking vacuum lines
Heat damage
A short to voltage in the pump relay control circuit can result in the AIR pump running continuously with the ignition OFF by back-feeding to ground. This will eventually result in pump failure.
An AIR pump that had become inoperative and had shown indications of having exhaust gases in the outlet port would indicate check valve failure.

NOTE: Refer to Continuous Operation of the Air Pump Notice in Service Precautions.

If the DTC cannot be duplicated and is determined to be intermittent, reviewing the Failure Records data can be useful in determining when the DTC was last set. Also refer to Intermittent Conditions. See: Powertrain Management\Computers and Control Systems\Testing and Inspection\Initial Inspection and Diagnostic Overview\Diagnostic Strategies\Intermittent Conditions

TEST DESCRIPTION

Steps 1-7

Steps 8-18

Steps 19-31

Steps 32-43

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

Other secondary air injection DTCs should be diagnosed first if set. If the HO2S voltage remains below 50 mV for approximately 5 seconds the system is operating normally.

Listen for a running motor. Command both the ON and OFF states. Repeat the commands as necessary.
Listen for a click when the device operates. Command both ON and OFF states. Repeat the commands as necessary.
This step begins eliminating a airflow problem.

This step tests for a vacuum leak at the valve.
This step tests the operation of the valve.

This step tests the control circuit for operation.
This step bypasses the relay to test the pump operation.

This step tests the control circuit for operation.

This step eliminates the relay and the control circuit as a cause for continuous pump operation.
This step tests the control circuit for operation.

The pump may have failed from another fault. If the pump operates without a command, refer to step 18.

If the HO2S voltage remains below 50 mV for approxim