Dodge Dakota (ND). Manual — part 779
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 POWERTRAIN VERIFICATION TEST. (Refer to 9
- ENGINE - STANDARD PROCEDURE)
9 - 654
ENGINE ELECTRICAL DIAGNOSTICS
ND
P2098-DOWNSTREAM FUEL TRIM SYSTEM 2 LEAN (CONTINUED)
6.
(K399) O2 SENSOR 2/2 HEATER CONTROL CIRCUIT SHORTED TO GROUND
Turn the ignition off.
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 POWERTRAIN VERIFICATION TEST. (Refer to 9
- ENGINE - STANDARD PROCEDURE)
No
>> Go To 7
Perform POWERTRAIN VERIFICATION TEST. (Refer to 9
- ENGINE - STANDARD PROCEDURE)
ND
ENGINE ELECTRICAL DIAGNOSTICS
9 - 655
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 POWERTRAIN VERIFICATION TEST. (Refer to 9
- ENGINE - STANDARD PROCEDURE)
No
>> Check the (K904) O2 Return Downstream 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 POWERTRAIN VERIFICATION TEST. (Refer to 9
- ENGINE - STANDARD PROCEDURE)
9 - 656
ENGINE ELECTRICAL DIAGNOSTICS
ND
P2099-DOWNSTREAM FUEL TRIM SYSTEM 2 RICH
ND
ENGINE ELECTRICAL DIAGNOSTICS
9 - 657
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