Chrysler 300/300 Touring/300C, Dodge Magnum. Manual — part 1434

P2243-O2 SENSOR 1/1 REFERENCE VOLTAGE CIRCUIT OPEN

For a complete wiring diagram Refer to Section 8W

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When Monitored:
With the ignition on and the O2 1/1 Sensor at operating temperature.

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Set Condition:
The ECM detects an open on the (K41) O2 1/1 Reference Signal circuit for 2.0 seconds.

Possible Causes

INTERMITTENT DTC

(K41) O2 1/1 REFERENCE SIGNAL CIRCUIT SHORTED TO VOLTAGE

(K41) O2 1/1 REFERENCE SIGNAL CIRCUIT SHORTED TO GROUND

(K41) O2 1/1 REFERENCE SIGNAL CIRCUIT SHORTED TO THE (K343) FUSED ASD RELAY OUTPUT 2
CIRCUIT

(K41) O2 1/1 REFERENCE SIGNAL CIRCUIT SHORTED TO THE (K99) O2 1/1 HEATER CONTROL CIRCUIT

(K41) O2 1/1 REFERENCE SIGNAL CIRCUIT OPEN OR HIGH RESISTANCE

OXYGEN SENSOR

ENGINE CONTROL MODULE (ECM)

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING)

Diagnostic Test

1.

DTC IS ACTIVE

Ignition on, engine not running.

With the scan tool, Clear DTCs in the Engine Control Module (ECM).

Start the engine.

Allow the engine to reach normal operating temperature.

Monitor the scan tool for at least two minutes.

With the scan tool, select View DTCs.

Is the status Active for this DTC?

Yes

>> Go To 2

No

>> Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 9 - ENGINE -

DIAGNOSIS AND TESTING)

2.

(K41) O2 1/1 REFERENCE SIGNAL CIRCUIT SHORTED TO VOLTAGE

Turn the ignition off.

Disconnect the Oxygen Sensor connector.

Disconnect the Engine Control Module (ECM) connector.

Remove the ASD Relay from the IPM.

Connect a jumper wire between cavity 30 and cavity 87 of the ASD
Relay Connector.

Turn the ignition on.

Measure the voltage of the (K41) O2 1/1 Reference Signal circuit in the
Oxygen Sensor connector.

Is there any voltage present?

Yes

>> Repair the (K41) O2 1/1 Reference Signal circuit for a short

to voltage.

Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

No

>> Go to 3

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3.

(K41) O2 1/1 REFERENCE SIGNAL CIRCUIT SHORTED TO GROUND

Turn the ignition off.

Measure the resistance between ground and the (K41) O2 1/1 Refer-
ence Signal circuit in the Oxygen Sensor connector.

Is the resistance above 10.0 ohms?

Yes

>> Go to 4

No

>> Repair the (K41) O2 1/1 Reference Signal circuit for a short

to ground.

Perform the ECM Verification Test Ver. 1. (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING)

4.

(K41) O2 1/1 REFERENCE SIGNAL CIRCUIT SHORTED TO THE (K343) FUSED ASD RELAY OUTPUT 2
CIRCUIT

Measure the resistance between the (K41) O2 1/1 Reference Signal cir-
cuit and the (K343) Fused ASD Relay Output 2 circuit in the Oxygen
Sensor connector.

Is the resistance above 10.0 ohms?

Yes

>> Go to 5

No

>> Repair the (K41) O2 1/1 Reference Signal circuit for a short

to the (K343) Fused ASD Relay Output 2 circuit.

Perform the ECM Verification Test Ver. 1. (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING)

5.

(K41) O2 1/1 REFERENCE SIGNAL CIRCUIT SHORTED TO THE (K99) O2 1/1 HEATER CONTROL
CIRCUIT

Measure the resistance between the (K41) O2 1/1 Reference Signal cir-
cuit and the (K99) O2 1/1 Heater Control circuit in the Oxygen Sensor
connector.

Is the resistance above 10.0 ohms?

Yes

>> Go to 6

No

>> Repair the (K41) O2 1/1 Reference Signal circuit for a short

to the (K99) O2 1/1 Heater Control circuit.

Perform the ECM Verification Test Ver. 1. (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING)

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6.

(K41) O2 1/1 REFERENCE SIGNAL CIRCUIT OPEN OR HIGH RESISTANCE

Measure the resistance of the (K41) O2 1/1 Reference Signal circuit
between the Oxygen Sensor connector and the Engine Control Module
(ECM) connector.

Is the resistance below 10.0 ohms?

Yes

>> Go to 7

No

>> Repair the (K41) 02 1/1 Reference Signal circuit for an

open circuit or high resistance.

Perform the ECM Verification Test Ver. 1. (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING)

7.

OXYGEN SENSOR

Turn the ignition off.

Connect the Engine Control Module (ECM) connector.

Replace the Oxygen Sensor in accordance with the Service Information.

Start the engine.

Allow the engine to reach normal operating temperature.

Monitor the scan tool for at least two minutes.

With the scan tool, select View DTCs.

Is the status Active for this DTC?

Yes

>> Go to 8

No

>> Test Complete.

Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

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