Chrysler 300/300 Touring/300C, Dodge Magnum. Manual — part 1363

5.

ENGINE CONTROL MODULE (ECM)

Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Crankcase Vent
Heater 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.

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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P053C-CRANKCASE VENT HEATER CONTROL CIRCUIT HIGH

For a complete wiring diagram Refer to Section 8W

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ENGINE ELECTRICAL DIAGNOSTICS - DIESEL

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•

When Monitored:
With the ignition on and the Crankcase Vent Heater command on.

•

Set Condition:
The ECM detects excessive current on the (N116) Crankcase Vent Heater Control circuit for 2.0 seconds.

Possible Causes

INTERMITTENT DTC

(N116) CRANKCASE VENT HEATER CONTROL CIRCUIT SHORTED TO VOLTAGE

(N116) CRANKCASE VENT HEATER CONTROL CIRCUIT SHORTED TO THE (K343) FUSED ASD RELAY
OUTPUT 2 CIRCUIT

(N116) CRANKCASE VENT HEATER CONTROL CIRCUIT OPEN OR HIGH RESISTANCE

CRANKCASE VENT HEATER

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).

With the scan tool, actuate the Crankcase Vent Heater.

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.

(N116) CRANKCASE VENT HEATER CONTROL CIRCUIT SHORTED TO VOLTAGE

Turn the ignition off.

Disconnect the Crankcase Vent Heater 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 (N116) Crankcase Vent Heater Control cir-
cuit in the Crankcase Vent Heater connector.

Is there any voltage present?

Yes

>> Repair the (N116) Crankcase Vent Heater Control 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.

(N116) CRANKCASE VENT HEATER CONTROL CIRCUIT SHORTED TO THE (K343) FUSED ASD RELAY
OUTPUT 2 CIRCUIT

Turn the ignition off.

Measure the resistance between the (N116) Crankcase Vent Heater
Control circuit and the (K343) Fused ASD Relay Output 2 circuit in the
Crankcase Vent Heater connector.

Is the resistance above 10.0 ohms?

Yes

>> Go to 4

No

>> Repair the (N116) Crankcase Vent Heater Control 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)

4.

(N116) CRANKCASE VENT HEATER CONTROL CIRCUIT OPEN OR HIGH RESISTANCE

Measure the resistance of the (N116) Crankcase Vent Heater Control
circuit between the Crankcase Vent Heater connector and the Engine
Control Module (ECM) connector.

Is the resistance below 10.0 ohms?

Yes

>> Go to 5

No

>> Repair the (N116) Crankcase Vent Heater Control circuit for

an open circuit or high resistance.

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

5.

CRANKCASE VENT HEATER

Turn the ignition off.

Connect the Engine Control Module (ECM) connector.

Remove the jumper wire and install the ASD Relay.

Turn the ignition on.

With the scan tool, actuate the Crankcase Vent Heater to On.

Using a 12 volt test light connected to 12 volts, check the (N116) Crankcase Vent Heater Control circuit in the
Crankcase Vent Heater harness connector.

NOTE: The test light should be illuminated and bright. Compare the brightness to that of a direct connec-
tion to the battery.

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