Description
The control module activates the Secondary Air Injection System by grounding both the pump relay and the vacuum control solenoid control circuits simultaneously. This energizes the pump and the vacuum control solenoid. Vacuum is then applied, opening the valves. The pump then forces fresh air into the exhaust stream in order to accelerate catalyst operation. The control module will run up to 3 diagnostic tests using the pre-catalyst 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 an air flow problem is detected this DTC will set. When inactive, the system prevents air flow in either direction.
Conditions for Running the DTC
| • | No EVAP, ECT, Fuel Trim, Idle Control, HO2S, MAF, IAT, TP, or Misfire DTCs set. |
| • | The engine run time is more than 90 seconds. |
| • | The fuel control is in Closed Loop. |
| • | The engine coolant temperature is between 65°C-110°C (149°F-230°F). |
| • | The mass air flow (MAF) is less than 8.1 g/s. |
| • | The ignition voltage is more than 11 volts. |
| • | The engine speed is more than 850 RPM. |
| • | The fuel system is operating in DECEL control cell. |
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 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/Failure Records data. |
Conditions for Clearing the MIL/DTC
| • | The PCM will turn OFF the malfunction indicator lamp (MIL) during the third consecutive trip in which the diagnostic has 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
Notice: Use the connector test adapter kit J 35616-A for any test that
requires probing the following items:
• The PCM harness connectors • The electrical center fuse/relay cavities • The component terminals • The component harness connector
If the problem is intermittent, refer to Symptoms .
If the DTC cannot be duplicated and is determined to be intermittent, reviewing the Failure Records can be useful in determining when the DTC was last set. Also refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
Step | Action | Values | Yes | No | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
1 | Did you perform the Powertrain On Board Diagnostic (OBD) System Check? | -- | ||||||||
2 |
Important: If DTC P0412 Secondary Air Injection (AIR) Solenoid Control Circuit or DTC P0418 Secondary Air Injection (AIR) Pump Relay Control Circuit are also set, perform that diagnostic first. Visually inspect for the following:
Did you find and correct the condition? | -- | ||||||||
3 |
Does the pump turn ON and OFF with each command? | -- | ||||||||
4 | With a scan tool, command the AIR solenoid ON and OFF. Does the solenoid turn ON and OFF with each command? | -- | ||||||||
5 |
Is airflow present at the hose outlet? | -- | ||||||||
6 |
Is vacuum present at the vacuum line? | -- | ||||||||
7 |
Is vacuum present at the vacuum line? | -- | ||||||||
8 |
Does the valve hold vacuum for 1 minute? | -- | ||||||||
9 |
Important: Attempt to blow through the valve without vacuum applied. If you can blow through the valve, refer to step 33.
Can you blow through the valve? | -- | ||||||||
10 | Does the pump run continuously? | -- | ||||||||
11 |
Does the test lamp illuminate when probing both circuits? | -- | ||||||||
12 |
Does the test lamp turn ON and OFF with each command? | -- | ||||||||
13 |
Does the AIR pump operate? | -- | ||||||||
14 |
Does the test lamp illuminate? | -- | ||||||||
15 |
Does the test lamp turn ON and OFF with each command? | -- | ||||||||
16 |
Is airflow present at the pump outlet? | -- | ||||||||
17 | Inspect the vacuum line from the solenoid to the valve for a restriction or a loose condition. Did you find and correct the condition? | -- | ||||||||
18 |
Does the pump stop operating? | -- | ||||||||
19 |
Does the test lamp turn ON and OFF with each command? | -- | ||||||||
20 | Inspect the feed fuse or fuses. Is the fuse or fuses OK? | -- | ||||||||
21 | Test the feed circuit corresponding to the blown fuse or fuses for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | ||||||||
22 | Test the pump feed for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | ||||||||
23 | Is the test lamp on steady? | -- | ||||||||
24 | Repair the vacuum source. Is the action complete? | -- | -- | |||||||
25 | Repair the pipe, hose or check valve for an open or a restriction. Did you find and correct the condition? | -- | ||||||||
26 |
Does the test lamp illuminate? | -- | ||||||||
27 |
Does the test lamp illuminate? | -- | ||||||||
28 | Repair the short to voltage in the pump feed circuit. Refer to Wiring Repairs in Wiring Systems. Is the action complete? | -- | -- | |||||||
29 | Test for a short to ground in the control circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | ||||||||
30 | Repair the open feed circuit. Refer to Wiring Repairs in Wiring Systems. Is the action complete? | -- | -- | |||||||
31 | Repair the open ground circuit. Refer to Wiring Repairs in Wiring Systems. Is the action complete? | -- | -- | |||||||
32 | Test for an open or short to voltage in the control circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | ||||||||
33 | Replace the valve. Refer to Secondary Air Injection Combination Valve/Pipe Replacement . Is the action complete? | -- | -- | |||||||
34 | Test for poor connections at the relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | ||||||||
35 | Replace the relay. Is the action complete? | -- | -- | |||||||
36 | Test for poor connections at the solenoid. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | ||||||||
37 | Replace the solenoid. Refer to Secondary Air Injection Vacuum Solenoid Replacement . Is the action complete? | -- | -- | |||||||
38 | Test for poor connections at the pump. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | ||||||||
39 |
Important: After you have replaced the pump, turn ON the ignition, with the engine OFF. If the pump runs without a scan tool command, refer to step 18. Replace the pump. Refer to Secondary Air Injection Pump Replacement . Is the action complete? | -- | -- | |||||||
40 | Test for poor connections at the control module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | ||||||||
|
Important: The replacement PCM must be programmed. Replace the PCM. Refer to Powertrain Control Module Replacement/Programming . Is the action complete? | -- | -- | ||||||||
42 |
Does the DTC reset? | -- | System OK |
