Refer to Engine Controls Schematics
Cell 23: Secondary AIR Controls
.
A problem with the AIR system may set one of the following DTCs:
| • | DTC P0410 |
| • | DTC P1415 |
| • | DTC P1416 |
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 |
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
The numbers below refer to the 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 |
Important: Before clearing DTCs, use the scan tool Capture Info to save the Freeze Frame and the Failure Records for reference. The control module's data is deleted once the Clear Info function is used. Did you perform the Powertrain On-Board Diagnostic (OBD) System Check? | -- | ||
Does the Short Term Fuel Trim indicate a change of more than the specified value within 30 seconds? | 2 min 6 % | |||
3 | Check all AIR pipes, hoses, and fittings for leaks. Did you find a problem? | -- | System OK | |
4 |
Is the AIR pump clutch engaged? | -- | ||
Is the AIR pump clutch engaged? | -- | |||
6 |
Is the test lamp ON? | -- | ||
7 | With the AIR relay still disconnected, connect a test lamp to the AIR relay control circuit and B+. Is the test lamp ON? | -- | ||
8 |
Is the test lamp 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 lamp to the AIR pump clutch control circuit and to a ground. Is the test lamp ON? | -- | ||
11 | Check for an open in the AIR pump clutch control circuit. Did you find a problem? | -- | ||
12 | Check for an open in the AIR pump ground circuit. Did you find a problem? | -- | ||
13 | Check for an open in the AIR pump clutch coil. Did you find a problem? | -- | ||
14 | Check for an open fuse in the AIR ignition feed circuit. Did you find a problem? | -- | ||
15 | Check for an open fuse in the AIR relay control circuit. Did you find a problem? | -- | ||
16 | Check the terminal contact at the VCM for the AIR relay control circuit. Did you find a problem? | -- | ||
17 |
Is the test lamp 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 |
Refer to Crankshaft Position System Variation Learn . 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 |
Did you find a problem? | -- | ||
27 | Replace the AIR pump. Refer to Secondary Air Injection Pump Replacement . Is the action complete? | -- | -- | |
28 |
Does the component operate properly? | -- | System OK |
