Dodge Ram. Manual — part 77
Symptom:
FCM - AMBIENT TEMP CONFIGURATION ERROR
When Monitored and Set Condition:
FCM - AMBIENT TEMP CONFIGURATION ERROR
When Monitored:
During power up.
Set Condition:
The FCM detects that an Ambient Temperature Sensor is present on the
input circuit and has gone through auto-configuration and another module is transmitting
a redundant ambient temp message.
POSSIBLE CAUSES
INCORRECT CONFIGURATION
FRONT CONTROL MODULE
TEST
ACTION
APPLICABILITY
1
NOTE: This code will only set if the FCM detects that another module
transmitting a redundant ambient temp message.
NOTE: Diagnose and repair any Communication DTCs before proceeding
with this test.
Ensure that the vehicle has only one Ambient Temperature Sensor, and that it is
hardwired to the FCM.
With the DRBIII
t, erase DTCs.
Cycle the ignition to auto-configure the FCM.
With the DRBIII
t, read DTCs.
Did this DTC reset?
All
Yes
→ Ensure that the vehicle is not equipped with multiple Ambient
Temperature Sensors. If vehicle is equipped with NGC, discon-
nect the ambient temp sensor to the FCM and cycle the ignition.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Replace and program the Front Control Module in accordance
with the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
305
COMPASS/MINI-TRIP COMPUTER
Symptom:
FCM - AMBIENT TEMP SENSOR INPUT LOW
When Monitored and Set Condition:
FCM - AMBIENT TEMP SENSOR INPUT LOW
When Monitored:
Continuous with the ignition on.
Set Condition:
The FCM detects less than 0.5 volts on the Ambient Temperature Sensor
Signal circuit.
POSSIBLE CAUSES
AMBIENT TEMPERATURE SENSOR
AMBIENT TEMPERATURE SENSOR SIGNAL CIRCUIT SHORT TO GROUND
AMBIENT TEMPERATURE SENSOR SIGNAL CIRCUIT SHORT TO SENSOR RETURN CIRCUIT
FRONT CONTROL MODULE
TEST
ACTION
APPLICABILITY
1
Disconnect the Ambient Temperature Sensor harness connector.
Close all vehicle doors.
Turn the ignition on.
With the DRBIII
t in Sensors, read the Ambient Temperature Sensor voltage.
Is the voltage above 4.8 volts?
All
Yes
→ Replace the Ambient Temperature Sensor.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 2
2
Turn the ignition off.
Disconnect the IPM C3 harness connector.
Disconnect the Ambient Temperature Sensor harness connector.
Measure the resistance between ground and the Ambient Temperature Sensor Signal
circuit.
Is the resistance below 5.0 ohms?
All
Yes
→ Repair the Ambient Temperature Sensor Signal circuit for a short
to ground.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 3
306
COMPASS/MINI-TRIP COMPUTER
TEST
ACTION
APPLICABILITY
3
Turn the ignition off.
Disconnect the Ambient Temperature Sensor harness connector.
Disconnect the IPM C3 harness connector.
Measure the resistance between the Ambient Temperature Sensor Signal circuit and
the Sensor Ground circuit.
Is the resistance below 5.0 ohms?
All
Yes
→ Repair the Ambient Temperature Sensor Signal circuit for a short
to the Sensor Return circuit.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Replace the Front Control Module in accordance with the Service
Information.
Perform BODY VERIFICATION TEST - VER 1.
307
COMPASS/MINI-TRIP COMPUTER
FCM - AMBIENT TEMP SENSOR INPUT LOW —
Continued
Symptom:
FCM - AMBIENT TEMP SENSOR INPUT OPEN
When Monitored and Set Condition:
FCM - AMBIENT TEMP SENSOR INPUT OPEN
When Monitored:
Continuous with the ignition on.
Set Condition:
The FCM detects more than 5.0 volts on the Ambient Temperature Sensor
Signal circuit.
POSSIBLE CAUSES
AMBIENT TEMPERATURE SENSOR SIGNAL CIRCUIT SHORT TO VOLTAGE
AMBIENT TEMPERATURE SENSOR
AMBIENT TEMPERATURE SENSOR RETURN CIRCUIT OPEN
AMBIENT TEMPERATURE SENSOR SIGNAL CIRCUIT OPEN
FRONT CONTROL MODULE
TEST
ACTION
APPLICABILITY
1
Disconnect the Ambient Temperature Sensor harness connector.
Connect a jumper wire between the sensor signal and sensor ground circuits.
Close all vehicle doors.
Turn the ignition on.
With the DRBIII
t in Sensors, read the Ambient Temperature Sensor voltage.
Is the voltage below 0.5 volts?
All
Yes
→ Replace the Ambient Temperature Sensor.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 2
2
Turn the ignition off.
Disconnect the Ambient Temperature Sensor harness connector.
Disconnect the IPM C3 harness connector.
Measure the voltage between the Ambient Temperature Sensor Signal circuit and
ground.
Is there any voltage present?
All
Yes
→ Repair the Ambient Temperature Sensor Signal circuit for a short
to voltage.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 3
308
COMPASS/MINI-TRIP COMPUTER
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