Circuit Description
An AIR pump is used on this vehicle to lower tail pipe emissions on start-up. The PCM supplies a ground to the AIR pump relay, which energizes the AIR pump.
The PCM monitors the HO2S voltages to diagnose the AIR system.
During the AIR test the PCM activates the AIR pump during closed loop operation. When the AIR is activated, the PCM monitors 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.
If the PCM determines that the HO2S voltages for BOTH banks did not respond as expected during the tests, DTC P0410 sets. If only one sensor responded, the PCM sets either a DTC P1415 or P1416 to indicate on which bank the AIR system is inoperative.
Conditions for Running the DTC
| • | DTCs P0101, P0102, P0103, P0107, P0108, P0112, P0113, P0117, P0118, P0121, P0122, P0123, P0171-P0175, P0200, P0300, P0335, P0336, P0351-P0358, P0443, P0500, P0502, P0503, P1258, and HO2S DTCs not set. |
| • | The engine operates for more than 2 seconds. |
| • | The engine run time is more than 15 seconds after closed loop operation. |
| • | The engine speed is more than 900 RPM. |
| • | The maximum air flow is 22 g/s. |
| • | The ECT is between 66°C (151°F) and 110°C (255°F). |
| • | The IAT is more than -10°C (14°F). |
| • | The ignition voltage is more than 11.7 volts. |
| • | The engine load is less than 42.5 percent. |
| • | Not operating in power enrichment mode OR deceleration fuel cut-off mode. |
| • | In short term Fuel Trim cells 1, 2, and 5. |
Conditions for Setting the DTC
| • | HO2S voltage does not go below 222 mV for 1 second, when the AIR pump turns ON during closed loop operation. |
| • | Short term fuel trim does not change a predetermined value, when the AIR pump turns ON during closed loop operation. |
Action Taken When the DTC Sets
| • | The PCM illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails. |
| • | The PCM records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the PCM stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the PCM records the operating conditions at the time of the failure. The PCM writes the conditions to the Freeze Frame and updates the Failure Records. |
Conditions for Clearing the MIL/DTC
| • | The PCM turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail. |
| • | A last test failed, or current DTC, clears when the diagnostic runs and does not fail. |
| • | 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
Important:
• Remove any debris from the PCM connector surfaces before servicing
the PCM. Inspect the PCM connector gaskets when diagnosing/replacing
the PCM. Ensure that the gaskets are installed correctly. The
gaskets prevent contaminate intrusion into the PCM. • For any test that requires probing the PCM or a component
harness connector, use the J 35616
connector test adapter kit. Using this kit prevents damage to
the harness/component terminals. Refer to
Using Connector Test Adapters
in Wiring Systems.
| • | Excessive resistance in any circuit related to the AIR system may cause this DTC to set. Listen for an audible click as the AIR solenoid and the AIR relay are commanded ON and OFF. If either component does not operate when commanded ON and OFF, and no other DTC is set, inspect the related circuits for excessive resistance. |
| • | The scan tool offers three modes of AIR output controls. AIR Pump Relay, AIR Solenoid, and AIR System. Select the AIR System function for all AIR diagnostics. |
| • | If air is present at both outlet hoses when the AIR system is enabled, inspect the AIR check valves and pipes for damage or restrictions. |
| • | For underhood fuseblock terminal identification, refer to Electrical Center Identification Views in Wiring Systems. |
For an intermittent, refer to Symptoms .
Test Description
The numbers below refer to the step numbers on the diagnostic table.
-
The AIR pump fuse is located in the engine wiring harness junction block #1.
-
If the AIR pump fuse is OK, then diagnose DTC P0412 or P0418 first.
-
The AIR pump relay is located in the engine wiring harness junction block #2.
-
Inspect for intermittent shorts to ground or connections, if the AIR pump functions properly.
-
Inspect the circuits for a short to ground between the AIR pump fuse and the AIR pump relay. Also inspect the circuit for a short to ground between the splice and the AIR solenoid valve.
Step | Action | Value(s) | Yes | No | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
1 | Did you perform the Powertrain On-Board Diagnostic (OBD) System Check? | -- | ||||||||
Is the AIR Pump fuse OK? | -- | |||||||||
Is DTC P0412 or P0418 also set? | -- | Go to DTC P0412 Secondary Air Injection (AIR) Solenoid Control Circuit or DTC P0418 Secondary Air Injection (AIR) Pump Relay Control Circuit | ||||||||
4 |
Does the AIR pump turn ON? | -- | ||||||||
|
Important: Refer to Electrical Center Identification Views in Wiring Systems for relay terminal identification.
Is the test lamp illuminated? | -- | |||||||||
6 | Jumper the B+ terminal to the AIR pump feed circuit at the relay harness connector using a fused jumper wire. Refer to Using Fused Jumper Wires in Wiring Systems. Does the AIR pump turn ON? | -- | ||||||||
7 |
Is the test lamp illuminated? | -- | ||||||||
8 |
Is the test lamp illuminated? | -- | ||||||||
9 |
Is an engine vacuum displayed on the vacuum gauge? | -- | ||||||||
10 |
Is an engine vacuum indicated on the vacuum gauge when the AIR system is enabled? | -- | ||||||||
11 |
Is an engine vacuum indicated on the vacuum gauge when the AIR system is enabled? | -- | ||||||||
12 |
Is air present at the AIR shut off valve supply hose? | -- | ||||||||
Is air present at both hoses? | -- | Go to Diagnostic Aids | ||||||||
14 |
Did you find and correct the condition? | -- | ||||||||
15 |
Does the test lamp illuminate? | -- | ||||||||
16 |
Does the test lamp illuminate? | -- | ||||||||
17 |
Does the AIR pump fuse open? | -- | ||||||||
18 |
Does the AIR pump fuse open? | -- | Go to Diagnostic Aids | |||||||
19 | Repair the open circuit between the fuse and the relay. Refer to Wiring Repairs in Wiring Systems. Is the action complete? | -- | -- | |||||||
20 | Repair the open circuit between the AIR pump and the AIR relay. Refer to Wiring Repairs in Wiring Systems. Is the action complete? | -- | -- | |||||||
21 | Repair the faulty ground connection or the open ground circuit. Refer to Wiring Repairs in Wiring Systems. Is the action complete? | -- | -- | |||||||
Repair the short to ground in the ignition feed circuit. Refer to Wiring Repairs in Wiring Systems. Is the action complete? | -- | -- | ||||||||
23 | Repair the short to ground in the circuit between the AIR pump relay and the AIR pump. Refer to Wiring Repairs in Wiring Systems. Is the action complete? | -- | -- | |||||||
24 |
Is the action complete? | -- | -- | |||||||
25 | Repair the vacuum hose as necessary. Is the action complete? | -- | -- | |||||||
26 | Replace the AIR pump relay. Is the action complete? | -- | -- | |||||||
27 | Replace the AIR Shut-off valve. Refer to Secondary Air Injection Shut Off Valve Replacement . Is the action complete? | -- | -- | |||||||
28 | Replace the AIR solenoid valve. Refer to Secondary Air Injection Solenoid Valve Replacement . Is the action complete? | -- | -- | |||||||
29 |
Did you find and correct the condition? | -- | ||||||||
30 | Replace the AIR pump. Refer to Secondary Air Injection Pump Replacement Is the action complete? | -- | -- | |||||||
31 |
Does the scan tool indicate that this test passed? | -- | -- | |||||||
32 | Select the Capture Info option and the Review Info option using the scan tool. Are any DTCs displayed that you have not diagnosed? | -- | Go to the applicable DTC table | System OK |
