Dodge Ram Truck 1500-2500-3500. Manual — part 976
P2098-DOWNSTREAM FUEL TRIM SYSTEM 2 LEAN (CONTINUED)
4.
O2 SENSOR
Ignition on, engine not running.
Disconnect the 2/2 O2 Sensor harness connector.
With the scan tool, monitor the 2/2 O2 Sensor voltage.
The O2 Sensor voltage should read 5.0 volts on the scan tool with the
connector disconnected.
Using a jumper wire, jump the (K243) O2 Sensor 2/2 Signal circuit to
the (K904) O2 Return Downstream circuit in the O2 Sensor harness
connector.
NOTE: The voltage should drop from 5.0 volts to 2.5 volts with
the jumper wire in place.
Did the O2 Sensor volts change from 5.0 volts to 2.5 volts?
Yes
>> Replace the O2 Sensor
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 5
9 - 826
ENGINE - ELECTRICAL DIAGNOSTICS - 3.7L/4.7L/5.7L
DR/DH
P2098-DOWNSTREAM FUEL TRIM SYSTEM 2 LEAN (CONTINUED)
5.
(K243) O2 SENSOR 2/2 SIGNAL CIRCUIT
Remove the jump wire.
Ignition on, engine not running.
With the scan tool, monitor the O2 Sensor voltage.
Is the voltage above 4.8 volts?
Yes
>> Go To 6
No
>> Check the (K243) O2 Sensor 2/2 Signal circuit for a open
or short to voltage. Inspect the O2 Sensor connector and
the PCM harness connector. If OK, replace and program
the Powertrain Control Module per Service Information.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
DR/DH
ENGINE - ELECTRICAL DIAGNOSTICS - 3.7L/4.7L/5.7L
9 - 827
P2098-DOWNSTREAM FUEL TRIM SYSTEM 2 LEAN (CONTINUED)
6.
(K399) O2 SENSOR 2/2 HEATER CONTROL CIRCUIT SHORTED TO GROUND
Turn the ignition off.
Disconnect the C3 PCM harness connector.
Measure the resistance between ground and the (K399) O2 Sensor
2/2 Heater Control circuit in the O2 Sensor harness connector.
Is the resistance below 5.0 ohms?
Yes
>> Repair the short to ground in the (K399) O2 Sensor 2/2
Heater Control circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 7
9 - 828
ENGINE - ELECTRICAL DIAGNOSTICS - 3.7L/4.7L/5.7L
DR/DH
P2098-DOWNSTREAM FUEL TRIM SYSTEM 2 LEAN (CONTINUED)
7.
(K904) O2 RETURN DOWNSTREAM CIRCUIT
Measure the voltage on the (K904) O2 Return Downstream circuit in
the O2 Sensor harness connector.
Is the voltage at 2.5 volts?
Yes
>> Check the fuel system for contaminants.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Check the (K904) O2 Downstream Return circuit for a
short to ground, open, or short to voltage. Inspect the O2
Sensor connector and the PCM harness connector. If OK,
replace and program the Powertrain Control Module per
Service Information.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
DR/DH
ENGINE - ELECTRICAL DIAGNOSTICS - 3.7L/4.7L/5.7L
9 - 829
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