DTC P1416 Secondary Air Injection (AIR) System Bank 2. Chevrolet Chevy Suburban

For 1990-2009 cars only

Makes 🢒 Chevrolet 🢒 1998 🢒 Chevy Suburban - 4WD 🢒 DTC 🢒 DTC P1416 Secondary Air Injection (AIR) System Bank 2

Engine Controls Components
Secondary Air Injection Controls
OBD II Symbol Description Notice
Handling ESD Sensitive Parts Notice

Circuit Description

A secondary air injection (AIR) pump is used on this vehicle to lower tailpipe emissions on start-up. The VCM supplies a ground to the AIR pump relay control circuit. This energizes the AIR pump relay and supplies voltage to the AIR pump clutch. The VCM uses the HO2S voltages and the short term fuel trim to diagnose the secondary air injection system.

The VCM monitors the HO2S voltages and the short term fuel trim value when the AIR pump is energized. This additional air causes the HO2S voltages to shift low, reflecting the leaner mixture. The short term fuel trim should increase above 128 confirming that the VCM is supplying additional fuel. The low HO2S voltages and higher short term fuel trim value provide confirmation that the secondary air injection system is operating properly. When the AIR pump is de-energized, the HO2S voltages should increase and begin switching normally.

If only one HO2S responded as expected, the VCM sets either a DTC P1415 or P1416 depending on which engine bank the AIR system is inoperative.

Conditions for Running the DTC

•	No active ECT DTCs

•	No active IAC DTCs

•	No active HO2S DTCs

•	No active misfire DTCs

•	No active MAP sensor DTCs

•	No active fuel trim DTCs

•	No active EVAP DTCs

•	No active TP sensor DTCs

•	No active IAT DTCs

•	No active MAF DTCs

•	The system voltage is greater than 10 volts

•	The IAT is greater than 0°C (32°F)

•	The power enrichment mode is not active

•	Decel fuel cut-off not active

•	The commanded air/fuel ratio is 14.7:1

•	The engine speed is greater than 550 RPM

•	The engine load is less than 50 percent

•	The MAF is less than 100 g/s

•	The ECT is between 75°C and 105°C (167°F to 221°F)

•	The system has been in closed loop mode for more than 15 seconds

Conditions for Setting the DTC

The VCM has not detected a change in HO2S voltage and short term fuel trim when the secondary air injection pump is energized.

Action Taken When the DTC Sets

The VCM will turn ON the malfunction indicator lamp (MIL) after two consecutive test cycles with the fault active.

Conditions for Clearing the MIL or DTC

•	The control module turns OFF the MIL after 3 consecutive drive trips when the test has run and passed.

•

A history DTC will clear if no fault conditions have been detected for 40 warm-up cycles. A warm-up cycle occurs when the coolant temperature has risen 22°C (40°F) from the startup coolant temperature and the engine coolant reaches a temperature that is more than 70°C (158°F) during the same ignition cycle.

•	Use a scan tool in order to clear the DTCs.

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 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 the step number(s) on the Diagnostic Table.

This step determines if the cause of the DTC is still present.

This step determines if there is a problem before or after the check valve.

Step

Action

Value(s)

Yes

Important: Before clearing DTC(s) use the scan tool to record Freeze Frame and Failure Records for reference, as data will be lost when the Clear Info function is used.

Was the Powertrain On-Board Diagnostic (OBD) System Check performed?

Go to Step 2

Go to the Powertrain On Board Diagnostic (OBD) System Check

Install a scan tool.
Start the engine and allow it to run for 2 minutes.
Verify the engine is at normal operating temperature and in Closed Loop.
Command ON the AIR Pump with the scan tool.

Does the Short Term Fuel Trim Bank 2 indicate a change of more than the specified value within 30 seconds?

16%

Go to Step 3

Go to Step 4

The DTC is intermittent.

Are any additional DTCs stored?

Go to the Applicable DTC Table

Go to Diagnostic Aids

Check the AIR System Bank 2 for the following:

•	Hoses/pipes for proper connections

•	Secure hose clamps

•	Kinks, holes or pinched hoses/pipes

•	Loose fittings

•	Components with evidence of heat damage

Did you find a problem?

Go to Step 8

Go to Step 5

Disconnect the AIR hose at the Bank 2 check valve (AIR Pump side).
Start the engine and allow it to idle.
Command ON the AIR Pump with the scan tool.

Does air flow from the hose?

Go to Step 6

Go to Step 7

Check for restrictions or leaks in the check valve and the AIR pipe on Bank 2.

Did you find a problem?

Go to Step 8

Go to Diagnostic Aids

Check for restrictions or leaks in the Bank 2 AIR hose between the AIR Shut Off Valve and the check valve.

Did you find a problem?

Go to Step 8

Go to Secondary Air Injection System Diagnosis

Repair as necessary. Refer to Secondary Air Injection Check Valve and Check Valve Pipe Replacement - Bank 1 .

Is the action complete?

Go to Step 9

Using the scan tool, select DTC, Clear Info.
Start the engine and idle until normal operating temperature.
Select DTC, Specific, then enter the DTC number which was set.
Operate the vehicle within the conditions for setting this DTC as specified in the supporting text.

Does the scan tool indicate that this diagnostic Ran and Passed?

Go to Step 10

Go to Step 2

Using the scan tool, select Capture Info, Review Info.

Are any additional DTCs displayed that have not been diagnosed?

Go to the Applicable DTC Table

System OK