Dodge Ram Truck 1500-2500-3500. Manual — part 1173

P0152-O2 SENSOR 2/1 CIRCUIT HIGH (CONTINUED)

8.

PCM

NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal
push out. Repair as necessary.
Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and
Ground circuits.

Were there any problems found?

Yes

>> Repair as necessary.

Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

No

>> Replace and program the Powertrain Control Module per Service Information.

Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)

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ENGINE - ELECTRICAL DIAGNOSTICS - SRT-10

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P0153-O2 SENSOR 2/1 SLOW RESPONSE

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P0153-O2 SENSOR 2/1 SLOW RESPONSE (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 ECT greater than 147°F, after reaching a vehicle speed of 10 mph, and the throttle remaining open (off
idle) for 2 minutes, bring the vehicle to a stop and allow the engine to idle with the transmission in DRIVE.

•

Set Condition:
The oxygen sensor signal voltage is switching from below 0.27 of a volt to above 0.62 of a volt and back fewer
times than required.

Possible Causes

EXHAUST LEAK

(K43) O2 2/1 SIGNAL CIRCUIT

(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.

ACTIVE DTC

NOTE: Check for contaminants that may have damaged the O2 Sensor: contaminated fuel, unapproved sil-
icone, oil and coolant.
Ignition on, engine not running.

NOTE: After the repairs have been made, verify proper O2 Sensor operation. If all the O2 Sensor voltage
readings have not returned to normal, follow the diagnostic procedure for the remaining O2 Sensors.
With a scan tool, read DTCs and record the related Freeze Frame data.

Is the DTC active at this time?

Yes

>> Go To 2

No

>> Refer to the INTERMITTENT CONDITION Diagnostic Procedure. (Refer to 9 - ENGINE - STANDARD

PROCEDURE)

2.

EXHAUST LEAK

Start the engine.

Inspect the exhaust system for leaks between the engine and the O2 Sensors.

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

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P0153-O2 SENSOR 2/1 SLOW RESPONSE (CONTINUED)

3.

(K43) O2 2/1 SIGNAL CIRCUIT VOLTAGE DROP

Turn the ignition off.

While backprobing, measure the voltage of the (K43) O2 Sensor 2/1 Signal circuit between the 2/1 O2 Sensor har-
ness connector and PCM harness connector.

NOTE: Make sure the voltmeter leads meet the terminals in the connector and that there is good terminal to
wire connection and 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 in 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.

While backprobing, measure the voltage of the (K900) Sensor ground circuit between the O2 Sensor harness con-
nector and PCM harness connector.

NOTE: Make sure the voltmeter leads meet the terminals in the connector 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)

NOTE: Turn the ignition off before continuing.

5.

O2 SENSOR

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)

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ENGINE - ELECTRICAL DIAGNOSTICS - SRT-10

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