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For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2000 🢒 Savana 🢒 DTC 🢒 DTC P0410 Secondary Air Injection (AIR) System

Object Number: 683339 Size: MF
Engine Controls Components
Secondary AIR Controls
OBD II Symbol Description Notice
Handling ESD Sensitive Parts Notice

Circuit Description

An AIR pump is used on this vehicle to lower tail pipe emissions at start-up. The VCM supplies a ground to the AIR pump relay, which energizes the AIR pump and the AIR solenoid.

When the AIR Pump is enabled, the VCM monitors the HO2S voltage. If the HO2S voltages go below a calibrated threshold value, the VCM interprets this as an indication that the AIR system is operational.

When the AIR Pump is disabled, the VCM monitors the HO2S voltages. The HO2S voltages should increase above a calibrated threshold value and switch normally.

If the VCM did not sense more than a predetermined amount of HO2S rich switches, a malfunction will be reported.

The VCM will activate the AIR pump during closed loop operation. When the AIR system is activated, the VCM will monitor the HO2S voltages and short term fuel trim values for both banks of the engine. If the AIR system is operating properly, the HO2S voltages should go low and the short term fuel trim should go high.

The VCM checks that the HO2S voltages return to above a rich threshold when the AIR pump is disabled.

If the VCM determines that the HO2S voltages for both banks did not respond as expected during the tests, DTC P0410 will set. If only one sensor responded, the VCM will set either a DTC P1415 or P1416 to indicate on which bank the AIR system is inoperative.

Conditions for Running the DTC
    • No MAF DTCs
    • No MAP DTCs
    • No IAT DTCs
    • No ECT DTCs
    •  No TP Sensor DTCs
    • No HO2S DTCs
    • No VSS DTCs
    • No system voltage DTCs
    • No fuel trim DTCs
    • No misfire DTCs
    • No CCP DTCs
    • The MAF is less than 25 g/s.
    • The engine load is less than 34 percent.
    • The power enrichment mode is not active.
    • The DFCO (Decel Fuel Cutoff mode) is not active.
    • The convertor over temperature is not active.
    • The engine run time after Closed Loop is more than 20 seconds.
    • The air/fuel ratio is 14.7:1.
    • The fuel trim counts are between 124-132.
    • The engine speed is above 550 RPM.
    • The ECT is between 80-107°C (176-225°F).
    • The system voltage is more than 11.7 volts.
    • The IAT is more than 2°C (36°F).

Conditions for Setting the DTC

The HO2S voltage is less than 222 mV for more than 1 second when AIR pump is enabled.

Action Taken When the DTC Sets
    • The control module illuminates the malfunction indicator lamp (MIL) if a failure is detected during 2 consecutive key cycles.
    • The control module sets the DTC and records the operating conditions at the time the diagnostic failed. The failure information is stored in the scan tool Freeze Frame/Failure Records.

Conditions for Clearing the MIL or DTC
    • The control module turns OFF the MIL after 3 consecutive drive trips when the test has run and passed.
    • A history DTC will clear if no fault conditions have been detected for 40 warm-up cycles. A warm-up cycle occurs when the coolant temperature has risen 22°C (40°F) from the startup coolant temperature and the engine coolant reaches a temperature that is more than 70°C (158°F) during the same ignition cycle.
    • Use a scan tool in order to clear the DTCs.

Diagnostic Aids

A low AIR system volume may cause a DTC P1415, P1416 or an intermittent complaint. Also check for the following conditions:

    • Pinched, kinked or restricted AIR pipes, hoses or fittings.
    • Leaks, holes, and loose fittings or hoses.
    • A restricted or obstructed AIR pump inlet.
    • Leaks or restrictions in the vacuum hoses for the AIR shut off valve.

An AIR supply hose that is melted before the check valve may indicate exhaust gas back-flow past the check valve.

An intermittent may be caused by any of the following conditions:

    • A poor connection
    • Rubbed through wire insulation
    • A broken wire inside the insulation

Thoroughly inspect any circuitry that is suspected of causing the intermittent complaint. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

If a repair is necessary, refer to Wiring Repairs or Connector Repairs in Wiring Systems.

Test Description

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

  1. This step will determine if the AIR System is functioning correctly.

    2.

  2. The engine must be running for this test to ensure a vacuum supply to the system.

    3.

  3. This step will determine if the AIR pump is capable of producing airflow.

    4.

  4. This step will determine if the VCM is capable of controlling the AIR pump relay.

Step

Action

Values

Yes

No

1

Did you perform the Powertrain On-Board Diagnostic (OBD) System Check?

--

Go to Step 2

Go to Powertrain On Board Diagnostic (OBD) System Check

2

Inspect the AIR maxifuse.

Is the fuse open?

--

Go to Step 13

Go to Step 3

3

Inspect the ignition fuse.

Is the fuse open?

--

Go to Step 29

Go to Step 4

4

  1. Install the scan tool.
  2. Start the engine and allow it to run for 2 minutes.
  3. Verify the engine is running at normal operating temperature and is in Closed Loop.
  4. Command ON the AIR pump with the scan tool.

Does the Short Term FT indicate a change of more than the specified value within 30 seconds?

20%

Go to Step 5

Go to Step 6

5

The DTC is intermittent.

Are any additional DTCs stored?

--

Go to the applicable DTC table

Go to Diagnostic Aids

6
  1. Turn ON the ignition, with the engine OFF.
  2. Command ON the AIR pump with the scan tool.

Is the AIR pump running?

--

Go to Step 7

Go to Step 9

7

With a scan tool, command the AIR pump OFF

Is the AIR pump OFF?

--

Go to Step 16

Go to Step 8

8
  1. Turn OFF the ignition.
  2. Disconnect the AIR pump relay.
  3. Turn ON the ignition, with the engine OFF.

Is the AIR pump ON?

--

Go to Step 34

Go to Step 9

9
  1. Turn OFF the ignition.
  2. Disconnect the AIR pump relay.
  3. Turn ON the ignition, with the engine OFF.
  4. Probe the AIR pump relay battery positive supply terminal at the relay connector with a test lamp connected to ground.

Is the test lamp ON?

--

Go to Step 10

Go to Step 31

10

Jumper the Battery Positive terminal to the AIR pump feed circuit at the relay harnesses connector using a fused jumper.

Is the AIR pump ON?

--

Go to Step 22

Go to Step 11

11
  1. Leave the jumper installed.
  2. Disconnect the AIR pump electrical connector.
  3. Probe terminal A of the AIR pump electrical connector with a test lamp connected to ground.

Is the lamp ON?

--

Go to Step 12

Go to Step 33

12
  1. Leave the jumper installed.
  2. Connect a test lamp from terminal A to terminal B of the AIR pump harness connector.

Is the test lamp ON?

--

Go to Step 37

Go to Step 39

13
  1. Turn OFF the ignition.
  2. Disconnect the AIR relay
  3. Remove the AIR maxifuse.
  4. Probe the battery feed terminal at the AIR pump relay harness connector with a test lamp connected to battery positive.

Is the test lamp ON?

--

Go to Step 32

Go to Step 14

14

  1. Disconnect the electrical connector from the AIR pump and the AIR solenoid.
  2. Probe the AIR pump/AIR solenoid feed circuit at the AIR pump relay harness connector with a test lamp connected to Battery Positive.

Is the test lamp ON?

--

Go to Step 35

Go to Step 15

15
  1. Reinstall the following components/electrical connector:
    2. • A new AIR maxifuse
    • The AIR pump relay
    • The AIR pump solenoid
  2. Turn ON the ignition, with the engine OFF.
  3. With a scan tool, command the AIR pump ON.

Does the AIR maxifuse open?

--

Go to Step 45

Go to Step 30

16
  1. Turn OFF the ignition.
  2. Disconnect the AIR solenoid harness connector.
  3. Turn ON the ignition, with the engine OFF.
  4. Probe the terminal for the solenoid battery positive voltage circuit at the AIR solenoid harness connector with a test lamp connected to a ground.
  5. Command ON the AIR pump with the scan tool.

Is the test lamp ON?

--

Go to Step 17

Go to Step 33

17
  1. Connect a test lamp between terminal A and terminal B of the AIR solenoid valve harness connector
  2. With a scan tool, command the AIR pump ON.

Is the test lamp ON?

--

Go to Step 18

Go to Step 37

18

Disconnect the vacuum harness from the AIR solenoid.

Connect a vacuum gauge to the vacuum source hose.

Start the engine

Is the reading on the gauge more than the specified value

10 in. Hg

Go to Step 19

Go to Step 38

19
  1. Reconnect only the vacuum supply hose to the AIR solenoid.
  2. Connect a vacuum gauge to the other port of the AIR solenoid.
  3. With a scan tool , command the AIR pump ON with the engine running.

Is the reading on the gauge more than the specified value?

10 in. Hg

Go to Step 20

Go to Step 45

20

  1. Reconnect the vacuum hose to the AIR solenoid.
  2. Disconnect the AIR shut off valve inlet hose at the AIR shut off valve.
  3. Start the engine.
  4. Command ON the AIR pump with the scan tool.

Is air flow present at the AIR shut off valve inlet hose?

--

Go to Step 21

Go to Step 37

21
  1. Reconnect the AIR inlet hose to the AIR shut-off valve
  2. Disconnect the AIR shut off valve output hose at the AIR shut off valve.
  3. Start the engine.
  4. Command ON the AIR pump with the scan tool.

Does air flow from the AIR shut off valve?

--

Go to Step 28

Go to Step 40

22
  1. Turn ON the ignition.
  2. Probe the ignition feed circuit terminal at the AIR pump relay with a test lamp connected to ground

Is the test lamp ON?

--

Go to Step 23

Go to Step 31

23

  1. Probe the control circuit at the relay connector with a test lamp connected to battery positive.
  2. With a scan tool, command the AIR pump ON.

Is the test lamp ON?

--

Go to Step 24

Go to Step 25

24
  1. Probe the control circuit at the relay connector with a test lamp connected to battery positive.
  2. With a scan tool, command the AIR pump OFF.

Is the test lamp OFF?

--

Go to Step 36

Go to Step 27

25
  1. Disconnect the connectors from the VCM.
  2. Probe the Control circuit at the relay connector with a test lamp connected to ground.

Is the test lamp ON?

--

Go to Step 42

Go to Step 26

26

Test the control circuit for continuity between the relay and the VCM.

Does the meter show continuity?

--

Go to Step 46

Go to Step 41

27
  1. Disconnect the VCM connectors.
  2. Test the control circuit for a short to ground.

Did you find a problem?

--

Go to Step 43

Go to Step 46

28

Check for leaks or restrictions in the following components:

    • Hoses
    • Check valves
    • Fittings
    • AIR pipes
    • Exhaust manifolds

Did you find a problem?

--

Go to Step 44

Go to Diagnostic aids

29
  1. Turn ON the ignition.
  2. Probe the ignition feed circuit terminal at the AIR pump relay connector with a test lamp connected to battery positive.

Is the test lamp ON?

--

Go to Step 32

Go to Diagnostic aids

30
  1. Reconnect the AIR pump.
  2. With a scan tool, command the AIR pump ON.

Does the AIR maxifuse open?

 

Go to Step 37

Go to Diagnostic Aids

31

Repair the open in the circuit between the fuse and the relay.

Is the repair complete?

--

Go to Step 48

--

32

Repair the short to ground in the circuit between the fuse and the relay.

Is the repair complete?

--

Go to Step 48

--

33

Repair the open in the circuit between the relay and the AIR pump/solenoid.

Is the repair complete?

--

Go to Step 48

--

34

Repair the short to voltage in the circuit between the relay and the AIR pump/solenoid.

Is the repair complete?

--

Go to Step 48

--

35

Repair the short to ground between the Air relay and the AIR pump/solenoid.

Is the repair complete?

--

Go to Step 48

--

36

Replace the AIR pump relay.

Is the repair complete?

--

Go to Step 48

--

37

Replace the AIR pump.

Is the repair complete?

--

Go to Step 48

--

38

Repair the leak or restriction in the vacuum hose.

Is the repair complete?

--

Go to Step 48

--

39

Repair the open in the AIR pump ground circuit.

Is the repair complete?

--

Go to Step 48

--

40

Replace the AIR shut-off valve.

Is the repair complete?

--

Go to Step 48

--

41

Repair the open in the AIR relay control circuit between the relay and the VCM.

Is the repair complete?

--

Go to Step 48

--

42

Repair the short to voltage in the AIR relay control circuit between the relay and the VCM.

is the repair complete?

--

Go to Step 48

--

43

Repair the short to ground in the AIR relay control circuit between the relay and the VCM.

Is the repair complete?

--

Go to Step 48

--

44

Repair the air delivery system as necessary.

Is the repair complete?

--

Go to Step 48

--

45

Replace the AIR pump solenoid.

Is the repair complete?

--

Go to Step 48

--

46

Check the VCM connections. Repair as necessary.

Was a repair necessary?

--

Go to Step 48

Go to Step 47

47

Important: The replacement VCM must be programmed.

Replace the VCM.

Refer to VCM Replacement/Programming .

Is the action complete?

--

Go to Step 48

--

48
  1. Install the scan tool.
  2. Start the engine and allow it to run for 2 minutes.
  3. Verify the engine is running at normal operating temperature and is in Closed Loop.
  4. Command ON the AIR pump with the scan tool.

Does the Short Term FT indicate a change of more than the specified value within 30 seconds?

20%

Go to Step 49

Go to Step 6

49
  1. Using the scan tool, clear the DTCs.
  2. Start the engine.
  3. Allow the engine to idle until the engine reaches normal operating temperature.
  4. Select DTC and the Specific DTC function.
  5. Operate the vehicle, with the Conditions for Setting this DTC, until the scan tool indicates the diagnostic Ran.

Does the scan tool indicate the diagnostic Passed?

--

Go to Step 50

Go to Step 6

50

Select the capture info option and review the captured info using the scan tool.

Are there any DTCs displayed that have not been diagnosed?

--

Go to the applicable DTC table

System OK