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Diagnostic Procedure

WARNING: This page is about a different car, the 2005 Dodge Stratus and 2005 Chrysler Sebring. However, it is still accessible from the selected car via links, so may be relevant.
DIAGNOSTIC PROCEDURES - P2448-AIR INJECTION SYSTEM HIGH FLOW

TEST ACTION APPLICABILITY
1
NOTE: Before performing the following test, always check the Air Pump Assembly in-line connectors. Ensure that there is no terminal damage, corrosion or backed out terminals. Verify that there is good wire to terminal connection in the connector.
Ignition on, engine not running.
NOTE: Check the 40 amp fuse that feeds the Air Injection Pump before continuing. Physically remove the fuse and check the it for proper operation. Replace as necessary.
With the DRBIII®, read DTCs and record the related Freeze Frame data.Is the Good Trip displayed and equal to zero?Yes --> Go To 2No --> Refer to the INTERMITTENT CONDITION .Perform POWERTRAIN VERIFICATION TEST VER - 5 .		 All
2 Exhaust System - crack/holes, damage exhaust manifold gasket and correct installation of the pipe to manifold connection.
Visually and physically inspect the following components for any conditions that would compromise the air flow.
Inlet Filter- cracks/holes or damage
Inlet Hose - disconnected hose, holes or incorrect installation
Air Injection Pump - cracks/holes or damage to the housing.
Air Injection Pump (Nylon) Tube - disconnected, damage, incorrect routing and holes/cracks.
Exhaust one-way check valve - Improper installation, missing gasket, damage or holes.
Were any of the above conditions found?
Yes --> Repair or replace as necessary.
Perform POWERTRAIN VERIFICATION TEST VER - 5 .
No --> Go To 3		 All
3
WARNING: Before performing this test, to avoid personal injury allow the exhaust manifold and related components to cool down to a safe temperature.
Turn the ignition on.Remove Exhaust one-way valve from the exhaust manifold.Using the DRBIII®, actuate the Air Injection Pump Relay.
NOTE: When the Air Injection Pump is actuated, forced air should come out of the opening of the Exhaust one-way valve.
Does forced air come out of the Exhaust one-way valve?Yes --> Go To 4No --> Go To 13		 All
4
WARNING: Before performing this test, to avoid personal injury allow the exhaust manifold and related components to cool down to a safe temperature.
NOTE: The exhaust system must be free of leaks in order for this test to work properly.
Turn the ignition off.Remove the Exhaust one-way valve.Remove the O2 1/1 sensor.Plug the exhaust at the tailpipe.Using the Miller Tool #8404 EELD, inject smoke into the Exhaust one-way valve tube attached to the exhaust manifold.
NOTE: The exhaust system will need to fill with smoke before a concentrated smoke will escape from the O2 sensor exhaust manifold hole.
While injecting smoke into the exhaust manifold, monitor the O2 sensor exhaust manifold hole for a minimum of 2 minutes.Does a consistent concentration of smoke escape from the O2 sensor exhaust manifold hole?Yes --> Go To 5No --> Clean or repair the cylinder head air passages and/or air distribution chamber.Perform POWERTRAIN VERIFICATION TEST VER - 5 .		 All
5
NOTE: Monitor the MAF Sensor voltage on the DRBIII® while performing this test. The voltage should start at 5.0 volts and go to 0 volts with the jumper wire in is place.
Turn the ignition off.Disconnect the MAF Sensor harness connector.Turn the ignition on.Connect a jumper wire between the MAF Sensor Signal circuit and the Sensor ground circuit.With the DRBIII®, monitor the MAF Sensor voltage.Does the voltage go from 5.0 volts to 0 volts?Yes --> Replace the MAF Sensor.Perform POWERTRAIN VERIFICATION TEST VER - 5 .No --> Go To 6		 All
6 Turn the ignition off.
Disconnect the MAF Sensor harness connector.
Disconnect the PCM harness connector.
Measure the resistance between the MAF Signal circuit and the ASD Relay Output circuit in the MAF Sensor harness connector.
Is the resistance below 100 ohms?
Yes --> Repair the MAF Signal circuit for a short to the ASD Relay Output circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5 .
No --> Go To 7		 All
7 Turn the ignition off.
Disconnect the MAF Sensor harness connector.
Disconnect the PCM harness connector.
Ignition on, engine not running.
Measure the voltage of the MAF Signal circuit in the MAP Sensor harness connector.
Is any voltage present?
Yes --> Repair the short to battery voltage in the MAF Signal circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5 .
No --> Go To 8		 All
8 Turn the ignition off.
Disconnect the MAF Sensor harness connector.
Disconnect the PCM harness connector.
CAUTION: DO NOT PROBE THE PCM HARNESS CONNECTORS. PROBING THE PCM HARNESS CONNECTORS WILL DAMAGE THE PCM TERMINALS RESULTING IN POOR TERMINAL TO PIN CONNECTION. INSTALL MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS.

Measure the resistance of the MAF Signal circuit from the MAF Sensor harness connector to the appropriate terminal of special tool #8815.
Is the resistance below 5.0 ohms?
Yes --> Go To 9
No --> Repair the open in the MAF Signal circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5 .		 All
9 Turn the ignition off.
Disconnect the MAF Sensor harness connector.
Disconnect the PCM harness connector.
Measure the resistance between ground and the MAF Signal circuit at the MAF Sensor harness connector.
Is the resistance below 100 ohms?
Yes --> Repair the short to ground in the MAF Signal circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5 .
No --> Go To 10		 All
10 Turn the ignition off.
Disconnect the MAF Sensor harness connector.
Disconnect the PCM harness connector.
Measure the resistance between the MAF Signal circuit and the Sensor ground circuit in the MAF Sensor harness connector.
Is the resistance below 100 ohms?
Yes --> Repair the Sensor ground shorted to the MAF Signal circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5 .
No --> Go To 11		 All
11 Turn the ignition off.
Disconnect the MAF Sensor harness connector.
Disconnect the PCM harness connector.
CAUTION: DO NOT PROBE THE PCM HARNESS CONNECTORS. PROBING THE PCM HARNESS CONNECTORS WILL DAMAGE THE PCM TERMINALS RESULTING IN POOR TERMINAL TO PIN CONNECTION. INSTALL MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS.

Measure the resistance of the Sensor ground circuit from the MAF Sensor harness connector to the appropriate terminal of special tool #8815.
Is the resistance below 5.0 ohms?
Yes --> Go To 12
No --> Repair the open in the Sensor ground circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5 .		 All
12
NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.
If there are no possible causes remaining, view repair.RepairReplace and program the Powertrain Control Module in accordance with the Service Information.Perform POWERTRAIN VERIFICATION TEST VER - 5 .		 All
13
WARNING: Before performing this test, to avoid personal injury allow the exhaust manifold and related components to cool down to a safe temperature.
Turn the ignition off.Disconnect the Air Injection Tube from the Exhaust one-way valve.Turn the ignition on.Using the DRBIII®, actuate the Air Injection Pump Relay.
NOTE: When the Air Injection Pump is actuated, forced air should come out of the opening of the Air Injection Pump Tube.
Does forced air come out of the Air Injection Pump Tube.Yes --> Replace the Exhaust one-way valve.Perform POWERTRAIN VERIFICATION TEST VER - 5 .No --> Go To 14		 All
14 Turn the ignition off.
Disconnect the Air Injection Pump Motor harness connector.
Turn the ignition on.
Using the DRBIII, actuate the Air Injection Pump Relay.
Using a 12-volt test light connected to ground, probe the Air Injection Pump Relay Output circuit in the Air Injection Pump Motor harness connector.
Does the test light illuminate brightly?
Yes --> Go To 15
No --> Go To 16		 All
15 Turn the ignition off.
Disconnect the Air Injection Pump Motor harness connector.
Using a 12-volt test light connected to battery voltage, probe the Air Injection Pump Motor ground circuit.
Does the test light illuminate brightly?
Yes --> Replace the Air Injection Pump Motor.
Perform POWERTRAIN VERIFICATION TEST VER - 5 .
No --> Repair the open in the Air Injection Pump Ground circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5 .		 All
16 Turn the ignition off.
Disconnect the Air Injection Pump Relay harness connector.
Turn the ignition on.
Using a 12-volt test light connected to ground, probe the Fused Battery Output circuit in the Air injection Pump Relay harness connector.
Does the test light illuminate brightly?
Yes --> Check the Air Injection Pump relay Output circuit for an open. If OK, replace the Air Injection Pump Relay.
Perform POWERTRAIN VERIFICATION TEST VER - 5 .
No --> Inspect the fuse for an open. If OK, repair the open in the Fused Battery Voltage Output circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5 .		 All
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