Dodge Ram Truck 1500-2500-3500. Manual — part 1251
P1195-O2 SENSOR 1/1 SLOW DURING CATALYST MONITOR (CONTINUED)
3.
(K41) O2 SENSOR 1/1 SIGNAL CIRCUIT VOLTAGE DROP
Turn the ignition off.
Backprobe the (K41) O2 Sensor 1/1 Signal circuit at the 1/1 O2 Sensor harness connector and PCM harness con-
nector.
NOTE: Make sure the voltmeter leads are connected for positive polarity, meet the terminals in the connec-
tor, and that there is good terminal to wire connection.
NOTE: Make sure the voltmeter leads are connected for positive polarity
Start the engine.
Allow the engine to idle.
Is the voltage below 0.10 of a volt?
Yes
>> Go To 4
No
>> Repair the excessive resistance on the (K41) O2 Sensor 1/1 Signal circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
4.
(K900) SENSOR GROUND CIRCUIT VOLTAGE DROP
Turn the ignition off.
Backprobe the (K900) Sensor ground circuit at the O2 Sensor harness connector and PCM harness connector.
NOTE: Make sure the voltmeter leads are connected for positive polarity, meet the terminals in the connec-
tor, and that there is good terminal to wire connection.
NOTE: Make sure the voltmeter leads are connected for positive polarity
Start the engine.
Allow the engine to idle.
Is the voltage below 0.10 of a volt?
Yes
>> Go To 5
No
>> Repair the excessive resistance in the (K900) Sensor ground circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
5.
O2 SENSOR
Turn the ignition off.
If there are no possible causes remaining, view repair.
Repair
Replace the O2 Sensor
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
9 - 1926
ENGINE - ELECTRICAL DIAGNOSTICS - SRT-10
DR/DH
P1196-O2 SENSOR 2/1 SLOW DURING CATALYST MONITOR
DR/DH
ENGINE - ELECTRICAL DIAGNOSTICS - SRT-10
9 - 1927
P1196-O2 SENSOR 2/1 SLOW DURING CATALYST MONITOR (CONTINUED)
For the engine circuit diagram. (Refer to 9 - ENGINE - SCHEMATICS AND DIAGRAMS)
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
With the engine running, coolant greater than 170°F, open throttle, steady to slightly increasing vehicle speed
greater than 18 mph but less than 55 mph, with a light load on the engine, for a period no less than 5 minutes.
•
Set Condition:
The oxygen sensor signal voltage is switching from below 0.39 of a volt to above 0.6 of a volt and back fewer
times than required.
Possible Causes
EXHAUST LEAK
RESISTANCE IN THE (K43) O2 SENSOR 2/1 SIGNAL CIRCUIT
RESISTANCE IN THE (K900) SENSOR GROUND CIRCUIT
O2 SENSOR
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING)
Diagnostic Test
1.
GOOD TRIP EQUAL TO ZERO
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?
Yes
>> Go To 2
No
>> Refer to the INTERMITTENT CONDITION Diagnostic Procedure.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
2.
EXHAUST LEAK
Start the engine.
Inspect the exhaust for leaks between the engine and the appropriate O2 Sensor.
Are there any exhaust leaks?
Yes
>> Repair or replace the leaking exhaust parts as necessary.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 3
9 - 1928
ENGINE - ELECTRICAL DIAGNOSTICS - SRT-10
DR/DH
P1196-O2 SENSOR 2/1 SLOW DURING CATALYST MONITOR (CONTINUED)
3.
(K43) O2 SENSOR 2/1 SIGNAL CIRCUIT VOLTAGE DROP
Turn the ignition off.
Backprobe the (K43) O2 Sensor 2/1 Signal circuit at the 2/1 O2 Sensor harness connector and PCM harness con-
nector.
NOTE: Make sure the voltmeter leads are connected for positive polarity, meet the terminals in the connec-
tor, and that there is good terminal to wire connection.
NOTE: Make sure the voltmeter leads are connected for positive polarity
Start the engine.
Allow the engine to idle.
Is the voltage below 0.10 of a volt?
Yes
>> Go To 4
No
>> Repair the excessive resistance on the (K43) O2 Sensor 2/1 Signal circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
4.
(K900) SENSOR GROUND CIRCUIT VOLTAGE DROP
Turn the ignition off.
Backprobe the (K900) Sensor ground circuit at the 2/1 O2 Sensor harness connector and PCM harness connector.
NOTE: Make sure the voltmeter leads are connected for positive polarity, meet the terminals in the connec-
tor, and that there is good terminal to wire connection.
NOTE: Make sure the voltmeter leads are connected for positive polarity
Start the engine.
Allow the engine to idle.
Is the voltage below 0.10 of a volt?
Yes
>> Go To 5
No
>> Repair the excessive resistance in the (K900) Sensor ground circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
5.
O2 SENSOR
Turn the ignition off.
If there are no possible causes remaining, view repair.
Repair
Replace the O2 Sensor
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
DR/DH
ENGINE - ELECTRICAL DIAGNOSTICS - SRT-10
9 - 1929
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