P0410

Diagnostic Chart (Part 1 Of 2):

Diagnostic Chart (Part 2 Of 2):

Engine Controls Schematics: AIR Motor, AIR Valve, AIR Relay and Theft Deterant Module:

CIRCUIT DESCRIPTION
An AIR pump is used on this vehicle to lower fail pipe emissions on start-up. The PCM grounds the AIR pump relay control circuit, which energizes the AIR pump. The PCM also grounds the AIR combination valve vacuum control solenoid circuit, which energizes the AIR vacuum control solenoid. Vacuum is then applied to both AIR combination valve diaphragms which open the shut off valves. The PCM enables both circuits simultaneously when AIR system operation is desired. When the AIR system is active, the AIR pump forces fresh air into the exhaust stream in order to accelerate catalyst operation. The AIR combination valves replace the conventional check valves. When the AIR system is inactive the shut off valves prevent air flow in either direction. DTC P0412 applies to the AIR vacuum control solenoid circuit. DTC P0418 applies to the AIR pump relay control circuit. DTC P0410 sets if an air flow problem is detected.

The PCM will run up to 3 diagnostic tests using the HO2S 1 voltage to diagnose the AIR system.

AIR ACTIVE TEST
The AIR Active Test has the PCM turn on the AIR pump specifically for diagnostic purposes. The AIR Active Test consists of the following:
^ During this test the PCM turns the AIR system on during closed loop operation. When the AIR system is activated, the PCM monitors the HO2S voltage. If the AIR system is operating properly, the HO2S 1 voltage should go below a predetermined threshold.
^ The PCM will repeat this test up to 3 consecutive times with a short delay between each command.
^ If the PCM determines that the HO2S 1 voltage did not respond as expected during the tests, DTC P0410 will set.

CONDITIONS FOR RUNNING THE DTC
^ DTCs P0101, P0102, P0103, P0107, P0108, P0112, P0113, P0117, P0118, P0121, P0122, P0123, P0171, P0172, P0300, P0412, P0418, P0442, P0443, P1441 and HO2S DTCs not set.
^ The engine operates for greater than 2 seconds.

CONDITION FOR NOT PASSING AIR ACTIVE TEST
The HO2S 1 voltage changes less than .06 or is above 225 mV for 1.5 seconds during 2.5 seconds of AIR pump operation.

CONDITIONS FOR SETTING THE DTC
If the AIR system fails three consecutive tests.

ACTION TAKEN WHEN THE DTC SETS
^ The PCM will illuminate the Malfunction Indicator Lamp (MIL) during the second consecutive trip in which the diagnostic test has been run and failed.
^ The PCM will store conditions which were present when the DTC set as Freeze Frame and Failure Records data.

CONDITIONS FOR CLEARING THE MIL/DTC
^ The PCM will turn OFF the MIL during the third consecutive trip in which the diagnostic has been run and passed.
^ The History DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction.
^ The DTC can be cleared by using a scan tool.

DIAGNOSTIC AIDS
Inspect for the following:

IMPORTANT: Remove any debris from the connector surfaces before servicing a component. Inspect the connector gaskets when diagnosing or replacing a component. Ensure that the gaskets are installed correctly. The gaskets prevent contaminate intrusion.

^ Poor terminal connection.
Inspect the harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, and faulty terminal to wire connection. Use a corresponding mating terminal to test for proper tension. Refer to Diagrams.
^ Damaged harness.
Inspect the wiring harness for damage. If the harness inspection does not reveal a problem, observe the display on the scan tool while moving connectors and wiring harnesses related to the sensor. A change in the scan tool display may indicate the location of the fault. Refer to Diagrams.
^ Inspect the PCM and the engine grounds for clean and secure connections.

If the DTC is determined to be intermittent, reviewing the Failure Records can be useful in determining when the DTC was last set.

TEST DESCRIPTION
The numbers below refer to the step numbers on the diagnostic table.
2. DTC P0412 AIR Solenoid Valve Control Circuit and P0418 AIR Pump Relay Control Circuit should be diagnosed first if either are set.
3. Begins testing for a short to ground in the AIR pump feed circuit.
4. Listen for a running motor. Command both the ON and OFF states. Repeat the commands as necessary.
5. Begins testing for a short to voltage in the pump feed circuit.
6. Tests for voltage at the AIR pump relay switch feed circuit.
7. Bypasses the relay.
8. Tests for voltage on the AIR pump feed circuit.
9. Tests for an open on the pump ground circuit.
28. The AIR Pump is not designed to run continuously. If the pump needs to be replaced, check for conditions that may cause continuous pump operation.