Chrysler 300/300 Touring/300C, Dodge Magnum. Manual — part 1411

5.

(K353) POST-CATALYST EXHAUST TEMPERATURE SENSOR SIGNAL CIRCUIT SHORTED TO (K915)
POST-CATALYST EXHAUST TEMPERATURE SENSOR GROUND CIRCUIT

Measure the resistance between the (K353) Post-Catalyst Exhaust Tem-
perature Sensor Signal circuit and the (K915) Post-Catalyst Exhaust
Temperature Sensor Ground circuit in the Post-Catalyst Exhaust Tem-
perature Sensor harness connector.

Is the resistance above 1000 ohms?

Yes

>> Go to 6

No

>> Repair the (K353) Post-Catalyst Exhaust Temperature Sen-

sor Signal circuit for a short to the (K915) Post-Catalyst
Exhaust Temperature Sensor Ground circuit.

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

6.

(K353) POST-CATALYST EXHAUST TEMPERATURE SENSOR SIGNAL CIRCUIT OPEN OR HIGH
RESISTANCE

Measure the resistance of the (K353) Post-Catalyst Exhaust Tempera-
ture Sensor Signal circuit between the Post-Catalyst Exhaust Tempera-
ture Sensor harness connector and the Engine Control Module (ECM)
harness connector.

Is the resistance below 10.0 ohms?

Yes

>> Go to 7

No

>> Repair the (K353) Post-Catalyst Exhaust Temperature Sen-

sor Signal circuit for an open circuit or high resistance.

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

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ENGINE ELECTRICAL DIAGNOSTICS - DIESEL

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7.

(K915) POST-CATALYST EXHAUST TEMPERATURE SENSOR GROUND CIRCUIT OPEN OR HIGH
RESISTANCE

Measure the resistance of the (K915) Post-Catalyst Exhaust Tempera-
ture Sensor Ground circuit between the Post-Catalyst Exhaust Temper-
ature Sensor harness connector and the Engine Control Module (ECM)
harness connector.

Is the resistance below 10.0 ohms?

Yes

>> Go to 8

No

>> Repair the (K915) Post-Catalyst Exhaust Temperature Sen-

sor Ground circuit for an open circuit or high resistance.

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

8.

POST-CATALYST EXHAUST TEMPERATURE SENSOR

Turn the ignition off.

Connect the Engine Control Module (ECM) connector.

Remove the jumper wire from between cavity 30 and cavity 87 of the ASD Relay Connector and install the relay.

Connect a jumper wire between the (K915) Post-Catalyst Exhaust Temperature Sensor Ground circuit and the
(K353) Post-Catalyst Exhaust Temperature Sensor Signal circuit in the Post-Catalyst Exhaust Temperature Sensor
harness connector.

Turn the ignition on.

With the scan tool, Clear DTCs.

With the scan tool, select View DTCs.

NOTE: The scan tool should display a Post-Catalyst Exhaust Temperature Sensor low voltage or short to
ground DTC with the jumper wire in place.

Does the scan tool display the DTC as described above?

Yes

>> Replace the Post-Catalyst Exhaust Temperature Sensor in accordance with the Service Information.

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

No

>> Go to 9

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ENGINE ELECTRICAL DIAGNOSTICS - DIESEL

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9.

ENGINE CONTROL MODULE (ECM)

Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Post-Catalyst
Exhaust Temperature Sensor and the Engine Control Module (ECM).

Look for any chafed, pierced, pinched, or partially broken wires.

Look for broken, bent, pushed out or corroded terminals.

Monitor the scan tool data relative to this circuit and wiggle test the wiring and connectors.

Look for the data to change or for the DTC to reset during the wiggle test.

Refer to any Technical Service Bulletins that may apply.

Were any problems found?

Yes

>> Repair as necessary.

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

No

>> Replace the Engine Control Module (ECM) in accordance with the Service Information.

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

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P2121-ACCELERATOR PEDAL POSITION SENSOR 1 PERFORMANCE

For a complete wiring diagram Refer to Section 8W

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