DTC P1416 Single AIR Pump System
Circuit Description
The secondary air injection (AIR) pump used on this vehicle lowers the tail pipe emissions during start-up. The AIR system consists of the following components:
| • | The AIR pumps |
| • | The shut-off valves |
| • | The vacuum control solenoid valve |
| • | The system hoses and pipes |
| • | The AIR relays, the fuses, and the related wiring |
The powertrain control module (PCM) uses the AIR relay in order to control the AIR pump. The PCM also controls the AIR vacuum control solenoid valve that supplies the vacuum to the AIR shut-off valves. With the AIR system inactive, the AIR shut-off valves prevent air flow in either direction. With the AIR system active, the PCM applies ground to the AIR relay, and the vacuum control solenoid valve. Fresh air flows from the pump, through the system hoses, past the shut-off valves, and into the exhaust stream. The air helps the catalyst to quickly get to a working temperature, lowering the tail pipe emissions during a start-up. The PCM tests the following AIR system components:
| • | The overall AIR system, including both banks--Any problems detected here will result in diagnostic trouble code (DTC) P0410. |
| • | The AIR system bank 1 (DTC P1415) |
| • | The AIR system bank 2 (DTC P1416) |
| • | The AIR relay (DTC P0418) |
| • | The AIR vacuum control solenoid valve (DTC P412) |
The PCM runs a passive test and an active test in order to diagnose the AIR system. Both tests involve a response from the fuel control HO2S (HO2S bank 1 sensor 1 and HO2S bank 2 sensor 2). The passive test consists of 2 parts. If both passive tests pass, the PCM takes no further action. If either part of the passive test fails or is inconclusive, the PCM initiates the active tests. If the PCM determines that the HO2S bank 2 sensor 1 did not respond as expected during the tests, DTC P1416 will set. For further information concerning the AIR system and the system tests, refer to Secondary Air Injection System Description .
Conditions for Running the DTC
Passive Tests:
| • | The engine is running. |
| • | The engine speed is more than 600 RPM. |
| • | The throttle is steady. |
| • | The engine load is less than 80 percent. |
| • | The system voltage is more than 10.5 volts. |
| • | The mass air flow (MAF) is less than 35 g/s. |
| • | The air/fuel ratio is more than 12.5:1. |
| • | The engine coolant temperature (ECT) is between 0-108°C (32-226°F). |
| • | The IAT is between 0-60°C (32-140°F). |
| • | The power enrichment, or deceleration fuel cut-off is not active. |
Active Tests:
| • | The engine is running. |
| • | The engine speed is more than 600 RPM. |
| • | The throttle is steady. |
| • | The engine load is less than 80 percent. |
| • | The system voltage is more than 10.5 volts. |
| • | The MAF is less than 35 g/s. |
| • | The fuel system is in closed-loop operation. |
| • | The EVAP purge is active. |
| • | The ECT is above 68°C (154°F). |
Conditions for Setting the DTC
Passive Tests:
| • | During the operation of the AIR pump, the HO2S bank 2 sensor 1 voltage remains above 470 mV for 20 seconds, and above 450 mV for 7 seconds during a hot start. |
| OR |
| With the AIR pump commanded OFF, the HO2S bank 2 sensor 1 voltage remains below 700 mV for 25 seconds. |
| • | The PCM initiates the active test due to a failed or an indeterminate passive test. |
Active Test:
| • | A failed or an indeterminate passive test has occurred. |
| • | The HO2S bank 2 sensor 1 voltage remains above 35 mV. |
| • | The PCM detects a failed passive test and 2 failed active tests. |
| OR |
| The PCM records an indeterminate passive test and 3 active tests. |
Action Taken When the DTC Sets
| • | The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails. |
| • | The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records. |
Conditions for Clearing the MIL/DTC
| • | The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail. |
| • | A current DTC, Last Test Failed, clears when the diagnostic runs and passes. |
| • | A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic. |
| • | Clear the MIL and the DTC with a scan tool. |
Diagnostic Aids
If the condition is intermittent, refer to Intermittent Conditions .
Test Description
The number below refers to the step number on the diagnostic table:
Step | Action | Values | Yes | No | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Schematic Reference: Engine Controls Schematics | ||||||||||||||
1 | Did you perform the Diagnostic System Check-Engine Controls? | -- | Go to Step 2 | |||||||||||
2 |
Does the HO2S voltage drop below the specified value? | 350 mV | Go to Diagnostic Aids | Go to Step 3 | ||||||||||
Does the vacuum gauge indicate vacuum? | -- | Go to Step 4 | Go to Step 5 | |||||||||||
4 | Inspect all pipes and hoses for:
Did you locate the condition? | -- | Go to Step 6 | Go to Step 7 | ||||||||||
5 | Replace the vacuum line between the AIR solenoid valve and the bank 2 AIR shut-off valve. Did you complete the replacement? | -- | Go to Step 8 | -- | ||||||||||
6 | Repair the condition. Refer to Secondary Air Injection Pipe Replacement - Bank 1 and Secondary Air Injection Pipe Replacement - Bank 2 . Did you complete the repair? | -- | Go to Step 8 | -- | ||||||||||
7 | Replace the bank 2 AIR shut-off valve. Refer to Secondary Air Injection Control Valve Replacement - Bank 2 . Did you complete the replacement? | -- | Go to Step 8 | -- | ||||||||||
8 |
Does the DTC run and pass? | -- | Go to Step 9 | Go to Step 2 | ||||||||||
9 | Select the Capture Info option and the Review Info option using the scan tool. Does the scan tool display any DTCs that you have not diagnosed? | -- | System OK | |||||||||||
DTC P1416 Dual AIR Pump System
Circuit Description
The two AIR pumps used on this vehicle lower tail pipe emissions during start-up. The AIR system consists of the following items:
| • | The AIR pumps |
| • | The check valves |
| • | The vacuum solenoid |
| • | The system hoses and pipes |
| • | The AIR relays, fuses, and related wiring |
The PCM uses the AIR relays to control the AIR pumps. The PCM also controls the AIR vacuum solenoid that supplies vacuum to the AIR check valves. With the AIR system inactive, the AIR check valves prevent air flow in either direction. With the AIR system active, the PCM applies ground to one of the AIR relays, and the vacuum solenoid. Then the PCM applies ground to the other AIR relay. Fresh air flows from the pumps, through the system hoses, pass the check valves, and into the exhaust stream. The air helps the catalyst to quickly get to a working temperature; thus lowering the tail pipe emissions on a start-up. The PCM tests the following AIR system components:
| • | The overall AIR system, including both banks -- any problems detected here will result in DTC P0410. |
| • | The AIR system bank 1 (DTC P1415) |
| • | AIR system bank 2 (DTC P1416) |
| • | AIR relays (DTC P0418, and DTC P0419) |
| • | AIR vacuum control solenoid (DTC P412) |
The PCM runs two tests to diagnose the AIR system: Passive, and Active. Both tests involve a response from the fuel control HO2 sensors (HO2S bank 1 sensor 1 and HO2S bank 2 sensor 2). The Passive test consists of two parts. If both passive tests pass, the PCM takes no further action. If either part of the passive test fails, or is inconclusive, the PCM initiates the Active tests. If the PCM determines that HO2S bank 2 sensor 1 did not respond as expected during the tests, DTC P1416 will set. For further information concerning the AIR system and system tests, refer to Secondary Air Injection System Description .
Conditions for Running the DTC
Passive Tests:
| • | The engine is running. |
| • | The engine speed is more than 600 RPM. |
| • | The throttle is steady. |
| • | The engine load is less than 80 percent. |
| • | The system voltage is more than 10.5 volts. |
| • | The MAF is less than 35 g/s. |
| • | The air fuel ratio is more than 12.5:1 |
| • | The ECT is between 0-108°C (32-226°F). |
| • | The IAT is between 0-60°C (32-140°F). |
| • | The power enrichment, or deceleration fuel cut-off is not active. |
Active Tests:
| • | The engine is running. |
| • | The engine speed is more than 600 RPM. |
| • | The throttle is steady. |
| • | The engine load is less than 80 percent. |
| • | The system voltage is more than 10.5 volts. |
| • | The MAF is less than 35 g/s. |
| • | The fuel system is in closed-loop operation. |
| • | The EVAP purge is active. |
| • | The ECT is above 68°C (154°F). |
Conditions for Setting the DTC
Passive Tests:
| • | During the operation of the AIR pumps, HO2S bank 1 sensor 1 voltage remains above 470 mV for 20 seconds (450 mV for 7 seconds on a hot start). |
| OR |
| • | When the AIR pumps are turned OFF, HO2S bank 1 sensor 1 voltage remains below 700 mV for 25 seconds. |
| • | The PCM initiates the active test due to a failed or an indeterminate passive test. |
Active Test:
| • | A failed or an indeterminate passive test |
| • | The HO2S bank 1 sensor 1 voltage remains above 35 mV. |
| • | The PCM detects a failed passive test and two failed active tests. |
| OR |
| • | The PCM records an indeterminate passive test and three active tests. |
Action Taken When the DTC Sets
| • | The PCM illuminates the malfunction indicator lamp (MIL) during the second consecutive trip in which the diagnostic test runs and fails. |
| • | The PCM stores the conditions present when the DTC set as Freeze Frame/Failure Records data. |
Conditions for Clearing the MIL/DTC
| • | The PCM will turn the MIL OFF after the third consecutive trip in which the diagnostic runs and passes. |
| • | The history DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction. |
| • | The DTC can be cleared by using the scan tool Clear DTC Information function. |
Diagnostic Aids
If the condition is intermittent, refer to Intermittent Conditions .
Step | Action | Values | Yes | No | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Schematic Reference: Engine Controls Schematics | ||||||||||||
1 | Did you perform the Diagnostic System Check-Engine Controls? | -- | Go to Step 2 | |||||||||
2 | Are any of the following DTCs set?
| -- | Go to applicable DTC table first | Go to Step 3 | ||||||||
3 | Check for a open AIR pump B fuse. Is the fuse open? | -- | Go to Step 12 | Go to Step 4 | ||||||||
4 | With the scan tool installed, command the AIR pump bank 2 ON and OFF. Does the AIR pump turn ON and OFF? | -- | Go to Step 11 | Go to Step 5 | ||||||||
5 | Is the AIR pump running continuously? | -- | Go to Step 9 | Go to Step 6 | ||||||||
6 |
Important: DO NOT allow AIR pump to run for more than 60 seconds. Is the AIR pump running? | -- | Go to Step 8 | Go to Step 7 | ||||||||
7 |
Did you find and correct the condition? | -- | Go to Step 20 | Go to Step 16 | ||||||||
8 |
Did you find and correct the condition? | -- | Go to Step 20 | Go to Step 17 | ||||||||
9 | Remove the AIR pump relay B. Is the AIR pump running? | -- | Go to Step 10 | Go to Step 17 | ||||||||
10 | Locate and repair the short to voltage in the circuit between the AIR relay and the AIR pump. Refer to Wiring Repairs in Wiring Systems. Is the action complete? | -- | Go to Step 20 | -- | ||||||||
11 |
Important: Replace the AIR pump fuse. Did you find and correct the condition? | -- | Go to Step 20 | Go to Step 16 | ||||||||
12 |
Is air flow present? | -- | Go to Step 13 | Go to Step 15 | ||||||||
13 |
Is the HO2S bank 2 sensor 1 voltage below the specified value? | 250 mV | Go to Step 18 | Go to Step 14 | ||||||||
14 |
Did you find and correct the condition? | -- | Go to Step 20 | Go to Step 19 | ||||||||
15 |
Did you find and correct the condition? | -- | Go to Step 20 | Go to Step 16 | ||||||||
16 | Replace the AIR pump. Refer to Secondary Air Injection Pump Replacement - Bank 2 . Is the action complete? | -- | Go to Step 20 | -- | ||||||||
17 | Replace the AIR pump relay B. Is the action complete? | -- | Go to Step 20 | -- | ||||||||
18 | Replace the vacuum line between the AIR vacuum solenoid and the AIR shut-off valve. Is the action complete? | -- | Go to Step 20 | -- | ||||||||
19 | Replace the bank 2 AIR shut-off valve. Is the action complete? | -- | Go to Step 20 | -- | ||||||||
20 |
Operate the vehicle within the Failure Records conditions. Does the scan tool indicate that DTC P1416 passed? | -- | System OK | Go to Step 2 | ||||||||
