Chrysler 300/300 Touring/300C, Dodge Magnum. Manual — part 1351
•
When Monitored:
With the ignition on. Battery voltage greater than 10 volts.
•
Set Condition:
The ECM receives a CAN Bus message from the FCM indicating an open or shorted circuit on the Radiator
Fan High Relay Control circuit.
Possible Causes
FUSED B+ CIRCUITS
(N112) RADIATOR FAN HIGH RELAY CONTROL CIRCUIT OPEN
(N112) RADIATOR FAN HIGH RELAY CONTROL CIRCUIT SHORTED TO GROUND
RADIATOR FAN HIGH RELAY
FRONT CONTROL MODULE
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING).
Diagnostic Test
1.
RADIATOR FAN HIGH RELAY OPERATION
Ignition on, engine not running.
With a scan tool, select Radiator Cooling Fan Relay #2 Control State, to actuate the Radiator Fan High Relay.
Is the Cooling Fan Relay operating?
Yes
>> Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING)
Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)
No
>> Go To 2
2.
FUSED B+ CIRCUITS
Turn the ignition off.
Remove the Radiator High Fan Relay.
Using a 12-volt test light connected to ground, probe the Fused B+ cir-
cuits in the Relay connection.
Does the test light illuminate brightly?
Yes
>> Go To 4
No
>> Go To 3
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ENGINE ELECTRICAL DIAGNOSTICS - DIESEL
LX
3.
RADIATOR FAN HI/LO CONTROL RELAY SHORTED INTERNALLY
With the test light still at the Fused B+ circuit (Radiator High Fan Relay), remove the Radiator Fan HI/LO Control
Relay.
When the relay is removed, does the test light illuminate brightly?
Yes
>> Replace the Radiator Fan HI/LO Control Relay.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES - STANDARD PROCEDURE)
No
>> Repair the open or short to ground in the Fused B+ circuits. Inspect the related fuse and repair as
necessary.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES - STANDARD PROCEDURE)
4.
RADIATOR FAN HIGH RELAY CONTROL CIRCUIT
Turn the ignition on, engine not running.
With a scan tool, select Radiator Cooling Fan Relay #2 Control State
and then Toggle, to actuate the Radiator Fan High Relay.
Using a 12–volt test light connected to battery voltage, probe the Radi-
ator Fan High Relay Control circuit in the PDM.
Does the test light illuminate and flash on and off?
Yes
>> Replace the Radiator Fan High Relay.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8
-
ELECTRICAL/ELECTRONIC
CONTROL MODULES
-
STANDARD PROCEDURE)
No
>> Go To 5
5.
(N112) RADIATOR FAN HIGH RELAY CONTROL CIRCUIT OPEN
Remove the FCM from the PDM.
Measure the resistance of the (N112) Radiator Fan High Relay Control
circuit from the Relay connection to the FCM PDM — 49 way connec-
tor.
Is the resistance below 5.0 ohms?
Yes
>> Go To 6
No
>> Replace the PDM in accordance with the Service Informa-
tion.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8
-
ELECTRICAL/ELECTRONIC
CONTROL MODULES
-
STANDARD PROCEDURE)
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ENGINE ELECTRICAL DIAGNOSTICS - DIESEL
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6.
(N112) RADIATOR FAN HIGH RELAY CONTROL CIRCUIT SHORTED TO GROUND
Measure the resistance between ground and the (N112) Radiator Fan
High Control circuit at the Relay connection.
Is the resistance below 100 ohms?
Yes
>> Go To 7
No
>> Replace the Front Control Module in accordance with the
Service Information.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8
-
ELECTRICAL/ELECTRONIC
CONTROL MODULES
-
STANDARD PROCEDURE)
7.
RADIATOR FAN HI/LO CONTROL RELAY SHORTED INTERNALLY
With the probe still at the (N112) Radiator Fan High Control circuit, remove the Radiator Fan HI/LO Control Relay.
Is the resistance still below 100 ohms?
Yes
>> Repair the open or short to ground in the (N112) Radiator Fan High Control circuit.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES - STANDARD PROCEDURE)
No
>> Replace the Radiator Fan HI/LO Control Relay.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES - STANDARD PROCEDURE)
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ENGINE ELECTRICAL DIAGNOSTICS - DIESEL
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P0487-EGR AIRFLOW THROTTLE CONTROL CIRCUIT A OPEN
For a complete wiring diagram Refer to Section 8W
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ENGINE ELECTRICAL DIAGNOSTICS - DIESEL
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