Secondary Air Injection System Description Overview
A problem with the AIR system may set one of the following DTCs:
| • | DTC P0410 |
| • | DTC P1415 |
| • | DTC P1416 |
Refer to the Secondary Air Injection System Description for diagnosis of the AIR system.
Air flowing to the exhaust ports at the wrong time can cause a false lean HO2S indication and cause the VCM to add extra fuel. This will result in increased catalytic converter temperature, because more fuel and air will be oxidizing in the converter.
The AIR system is not completely noiseless. Under normal conditions noises rises in pitch as engine speed increases.
If noise is caused by the AIR system, check for the following:
| • | A seized AIR pump |
| • | Proper mounting and bolt torque of the pump |
| • | Proper routing and connections of the hoses |
Secondary Air Injection System Description System Check
Refer to Engine Controls Schematics
Circuit Description
A fused ignition voltage is supplied to the AIR relay. The VCM controls the AIR pump by grounding the AIR relay control circuit. This energizes the relay and supplies voltage to the AIR pump clutch. When the fuel system goes to the Closed Loop mode, the VCM opens the ground to the AIR control circuit.
Diagnostic Aids
An intermittent may be caused by a poor connection, rubbed through wire insulation, or a broken wire inside the insulation.
Check for the following conditions:
| • | Poor connection or damaged harness - Inspect the harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, poor terminal to wire connection, and a damaged harness. |
| • | Worn or loose AIR pump drive belt |
| • | Pinched, kinked, or restricted AIR pipes, hoses, or fittings |
Test Description
Number(s) below refer to step numbers on the Diagnostic Table
-
This step will determine if the VCM is capable of controlling the AIR system.
-
Leaks in the AIR system may affect other sensor operations.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Was the Powertrain On-Board Diagnostic (OBD) System Check performed? | -- | ||
Does the Short Term Fuel Trim indicate a change of more than the specified value with 30 seconds? | 2 min 6% | |||
Check all AIR pipes, hoses, and fittings for leaks. Was a problem found? | -- | System OK | ||
4 |
Is the AIR pump clutch engaged? | -- | ||
5 |
Is the AIR pump clutch engaged? | -- | ||
6 |
Is the test light ON? | -- | ||
7 | With the AIR relay still disconnected, connect a test light to the AIR relay control circuit and B+. Is the test light ON? | -- | ||
8 |
Is the test light ON? | -- | ||
9 | Connect a fused jumper to the AIR pump clutch control circuit and B+. Is the AIR pump clutch engaged? | -- | ||
10 | Connect a test light to the AIR pump clutch control circuit and ground. Is the test light ON? | -- | ||
11 | Check for an open in the AIR pump clutch control circuit. Was a problem found? | -- | ||
12 | Check for an open in the AIR pump ground circuit. Was a problem found? | -- | ||
13 | Check for an open in the AIR pump clutch coil. Was a problem found? | -- | ||
14 | Check for an open fuse in the AIR ignition feed circuit. Was a problem found? | -- | ||
15 | Check for an open in the AIR relay control circuit. Was a problem found? | -- | ||
16 | Check the terminal contact at the VCM for the AIR relay control circuit. Was a problem found? | -- | ||
17 |
Is the test light ON? | -- | ||
18 | Repair the short to ground in the ignition feed circuit to the AIR relay. Is the action complete? | -- | -- | |
19 | Repair the open in the ignition feed circuit to the AIR relay. Is the action complete? | -- | -- | |
20 | Replace the AIR relay. Is the action complete? | -- | -- | |
21 | Repair the short to ground in the AIR relay control circuit. Is the action complete? | -- | -- | |
22 | Repair the short to voltage on the AIR pump clutch control circuit. Is the action complete? | -- | -- | |
23 | Replace the VCM. Important: If the VCM is faulty, the new VCM must be programmed. Refer to VCM Replacement/Programming . Is the action complete? | -- | -- | |
24 | Repair as necessary. Is the action complete? | -- | -- | |
25 |
Does the airflow increase as the engine is accelerated? | 1500 RPM | ||
26 |
Was a problem found? | -- | ||
27 | Replace the AIR pump. Refer to Secondary Air Injection System Description . Is the action complete? | -- | -- | |
28 |
Does the component operate properly? | -- | System OK |
