2006 DODGE RAM SRT-10 Service Repair Manual

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DODGE RAM SRT-10 2006 Service Repair Manual Theory of Operation
The upstream O2 sensor is used to detect the amount of oxygen in the exhaust gas before the gas enters the
catalytic converter. During the catalyst/O2 monitor test, the response ra

Theory of Operation
The upstream O2 sensor is used to detect the amount of oxygen in the exhaust gas before the gas enters the
catalytic converter. During the catalyst/O2 monitor test, the response rate (cycles/second) of the upstream O2 sen-
sor determines the sensor’s ability to achieve the tailpipe emissions limits. The response rate of the downstream O2
sensor relative to the upstream O2 sensor response rate measures the catalyst’s ability to store oxygen and is used
to infer the catalyst’s ability to achieve the tailpipe emissions limits.
When Monitored:
After engine warm up to 147 deg. F, 180 seconds of open throttle operation, at a speed greater than 20 mph,
with the engine at 1200-1700 rpm and MAP vacuum between 15.0 and 21.0 inchesof mercury (Hg).
Set Condition:
As catalyst efficiency deteriorates, the switch rate of the downstream O2sensor approaches that of the
upstream O2 sensor. If at any point during the test the switch ratio reachesa predetermined value a counter
is incremented by one. Three good trips to turn off the MIL.
Possible Causes
EXHAUST LEAK
ENGINE MECHANICAL
AGING O2 SENSOR
CATALYTIC CONVERTER
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING).
Diagnostic Test
1.ACTIVE DTC
NOTE: A new rear O2 Sensor along with an aging front O2 Sensor may cause the DTCtoset.Reviewthe
repair history of the vehicle before continuing.
NOTE: If an O2 Sensor DTC set along with the Catalytic Converter EfficiencyDTC diagnose the O2 Sensor
DTC(s) before continuing.
NOTE: Check for contaminants that may have damaged the O2 Sensor and Catalytic Converter: contami-
nated fuel, unapproved silicone, oil and coolant, repair necessary.
Ignition on, engine not running.
With a scan tool, read DTCs.
Is the DTC active at this time?
Ye s>>
Go To 2
No>>
Refer to the INTERMITTENT CONDITION Diagnostic Procedure.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
2.VISUALLY INSPECT CATALYTIC CONVERTER
Inspect the Catalytic Converter for the following damage.
Damaged Catalytic Converter, dents or holes.
Severe discoloration caused by overheating the Catalytic Converter.
Catalytic Converter broken internally.
Leaking Catalytic Converter.
Were any problems found?
Ye s>>
Replace the Catalytic Converter. Repair the condition that may have caused the failure.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No>>
Go To 3

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DODGE RAM SRT-10 2006 Service Repair Manual 3.EXHAUST LEAK
Start the engine.
Inspect the exhaust for leaks between the engine and the 2/1 O2 Sensor.
Inspect the exhaust for leaks between the engine and the 2/2 O2 Sensor.
Are there any exhaust l

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DODGE RAM SRT-10 2006 Service Repair Manual P0441-EVAP PURGE FLOW MONITOR
For a complete wiring diagramRefer to Section 8W.

Page 1268 of 5267

DODGE RAM SRT-10 2006 Service Repair Manual When Monitored:
With engine temperature greater than 170° F, fuel control in closed loop, engine idling for 2 minutes, no low
fuel, MAP less than 15.7 inches mercury and barometric altitude less than

When Monitored:
With engine temperature greater than 170° F, fuel control in closed loop, engine idling for 2 minutes, no low
fuel, MAP less than 15.7 inches mercury and barometric altitude less than 8,000 feet.
Set Condition:
After having passed the Leak Detection Pump (LDP) test, no air flow throughthe evaporative system is
detected by the EVAP monitor.
Possible Causes
EVAP PURGE HOSE (SOLENOID TO CANISTER)
EVAP PURGE HOSE (CANISTER TO FUEL TANK)
EVAP PURGE SOLENOID VACUUM SUPPLY
EVAP PURGE SOLENOID (LEAKS/STUCK OPEN)
EVAP PURGE SOLENOID
For the Engine circuit diagram (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES/ENGINE CON-
TROL MODULE - SCHEMATIC - ELECTRICAL)
Diagnostic Test
1.VEHICLE HISTORY AND SERVICE BULLETIN INVESTIGATION
Ignition on, engine not running.
With a scan tool, read DTCs and record the related Freeze Frame data if any DTC(s) are present.
Whether or not any DTC(s) are present you will want to check the following items which may assist in repairing the
customer’s complaint successfully.
Check the vehicles repair history.
If the vehicle has a repair history that pertains to the customer’s currentcomplaint, review the repair.
Inspect the vehicle for any aftermarket accessories that may have been installed incorrectly.
Check for any service bulletin(s) related to the customer’s complaint or DTC(s).
If a service bulletin applies, follow the instructions per the service bulletin.
Choose the following scenario that best applies.
The service bulletin repaired the customer’s complaint.
Testing complete.
A DTC is present, no service bulletins apply, or the service bulletin didn’t repair the customer’s complaint.
Go To 2
2.GOOD TRIP EQUAL TO ZERO
Check for any related TSBs.
Ignition on, engine not running.
With the scan tool, read DTCs and record the related Freeze Frame data.
Is the Good Trip Counter displayed and equal to zero?
Ye s>>
Go To 3
No>>
Refer to the INTERMITTENT CONDITION Diagnostic Procedure.
Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

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DODGE RAM SRT-10 2006 Service Repair Manual 3.VISUAL INSPECTION
Visually inspect the Evap canister. Look for any physical damage or any signs of fuel that has entered the canister.
Any signs of fuel may indicate a bad rollover valve.
Were any p

3.VISUAL INSPECTION
Visually inspect the Evap canister. Look for any physical damage or any signs of fuel that has entered the canister.
Any signs of fuel may indicate a bad rollover valve.
Were any problems found?
Ye s>>
Repair or Replace as necessary.
Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No>>
Go To 4
4.VISUAL INSPECTION OF EVAP PURGE HOSE (SOLENOID TO CANISTER)
Visually inspect the Evap purge hose that goes from the Purge Solenoid to the Evap Canister. Look for any physical
damage such as a pinched, plugged, ripped or dry rotted hose.
Were any problems found?
Ye s>>
Repair or replace hose as necessary.
Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No>>
Go To 5
5.VISUAL INSPECTION OF EVAP PURGE HOSE (EVAP CANISTER TO FUEL TANK)
Visually inspect the Evap Purge hose that goes between the Evap canister and the fuel tank. Look for any physical
damage such as a pinched, plugged, ripped or dry rotted hose.
Were any problems found?
Ye s>>
Repair or replace hose as necessary.
Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No>>
Go To 6
6.EVAP VACUUM SUPPLY HOSE INSPECTION
Carefully inspect the Evap Purge Solenoid vacuum supply hose for proper routing. Also check for a pinched or
plugged hose from the throttle body to the Purge Solenoid.
Inspect the vacuum nipple at the throttle body for any damage or plugging.
Make sure vacuum fitting at the purge solenoid is not over installed.
Is the vacuum supply hose and throttle body vacuum nipple free from defects?
Ye s>>
Go To 7
No>>
Repair the vacuum supply hose/tube as necessary.
Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
7.EVAP PURGE SOLENOID LEAKS
NOTE: After disconnecting the Evap Purge Solenoid vacuum connections, inspect the lines and solenoid for
any signs of contamination from the EVAP Canister. This may indicate a faulty rollover valve. Replace purge
solenoid if contamination is found
Disconnect the vacuum hoses at the EVAP Purge Solenoid.
Using a hand vacuum pump, apply 10 inches of vacuum to the Evap Purge Solenoid vacuum source port. (com-
ponent side)
Does the Evap Purge Solenoid hold vacuum?
Ye s>>
Go To 8
No>>
Replace the Evap Purge Solenoid and the Evap Canister and clean out Evap lines as necessary.
Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

Page 1270 of 5267

DODGE RAM SRT-10 2006 Service Repair Manual 8.EVAP PURGE SOLENOID
Using a hand vacuum pump, apply 10 inches of vacuum to the Evap Purge Solenoid vacuum source port. (com-
ponent side)
Ignition on, engine not running.
With the scan tool, actuate

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DODGE RAM SRT-10 2006 Service Repair Manual P0442-EVAP LEAK MONITOR MEDIUM (0.040) LEAK DETECTED
For a complete wiring diagramRefer to Section 8W.

Page 1272 of 5267

DODGE RAM SRT-10 2006 Service Repair Manual When Monitored:
Immediately after a cold start, with battery/ambient temperature between 40° F and 90° F and coolant tem-
perature within 10° F of battery/ambient.
Set Condition:
If there is a leak

When Monitored:
Immediately after a cold start, with battery/ambient temperature between 40° F and 90° F and coolant tem-
perature within 10° F of battery/ambient.
Set Condition:
If there is a leak larger than 0.040
and smaller than 0.080in the evaporative system.
Possible Causes
EVAP PURGE SYSTEM LEAK
GAS CAP
EVAP PURGE SOLENOID
LEAK DETECTION PUMP
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING).
Diagnostic Test
1.VEHICLE HISTORY AND SERVICE BULLETIN INVESTIGATION
Ignition on, engine not running.
With a scan tool, read DTCs and record the related Freeze Frame data if any DTC(s) are present.
Whether or not any DTC(s) are present you will want to check the following items which may assist in repairing the
customer’s complaint successfully.
Check the vehicles repair history.
If the vehicle has a repair history that pertains to the customer’s currentcomplaint, review the repair.
Inspect the vehicle for any aftermarket accessories that may have been installed incorrectly.
Check for any service bulletin(s) related to the customer’s complaint or DTC(s).
If a service bulletin applies, follow the instructions per the service bulletin.
Choose the following scenario that best applies.
The service bulletin repaired the customer’s complaint.
Testing complete.
A DTC is present, no service bulletins apply, or the service bulletin didn’t repair the customer’s complaint.
Go To 2
2.ACTIVE DTC
NOTE: Since a hot vehicle can conceal a leak, it is best to perform this test at room temperature.
NOTE: A loose gas cap could have caused this DTC to set. Make sure gas cap is tight and in good condi-
tion. Make sure the gas cap meets OEM specifications.
Ignition on, engine not running.
With a scan tool, read DTCs.
Is the DTC active at this time?
Ye s>>
Go To 3
No>>
Refer to the INTERMITTENT CONDITION Diagnostic Procedure.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

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