Mercedes-Benz Sprinter / Dodge Sprinter. Manual — part 25
Symptom List:
OVERHEATING SENSOR OPEN
OVERHEATING SENSOR SHORTED
Test Note:
All symptoms listed above are diagnosed using the same tests.
The title for the tests will be OVERHEATING SENSOR OPEN.
When Monitored and Set Condition:
OVERHEATING SENSOR OPEN
When Monitored:
During heater activation and operation.
Set Condition:
This DTC will set if the Overheating Sensor’s resistance is not within the
expected parameters.
OVERHEATING SENSOR SHORTED
When Monitored:
During heater activation and operation.
Set Condition:
This DTC will set if the Overheating Sensor’s resistance is not within the
expected parameters.
POSSIBLE CAUSES
OVERHEATING SENSOR
TEST
ACTION
APPLICABILITY
1
WARNING: NEVER OPERATE THE HEATER IN AN ENCLOSED AREA
THAT DOES NOT HAVE EXHAUST VENTILATION FACILITIES. ALWAYS
VENT THE EXHAUST WHEN OPERATING THE HEATER. FAILURE TO
FOLLOW THESE INSTRUCTIONS CAN RESULT IN PERSONAL INJURY
OR DEATH.
WARNING: ALLOW THE HEATER ASSEMBLY TO COOL BEFORE PER-
FORMING A COMPONENT INSPECTION/REPAIR/REPLACEMENT. FAIL-
URE TO FOLLOW THESE INSTRUCTIONS CAN RESULT IN PERSONAL
INJURY OR DEATH.
CAUTION: DO NOT PERFORM THIS TEST UNLESS DIRECTED HERE BY
THE HEATER PRE-TEST. ALWAYS PERFORM THE HEATER PRE-TEST
PRIOR TO PERFORMING ANY OTHER TEST FOR THE RESULT TO BE
VALID.
Turn the ignition off.
View repair
All
Repair
Replace the Cabin Heater Assembly or Heater Booster Assembly
in accordance with the Service Information.
Perform HEATER VERIFICATION TEST - VER 1.
97
CABIN HEATER
Symptom List:
TEMP SENSOR OPEN
TEMP SENSOR SHORTED
Test Note:
All symptoms listed above are diagnosed using the same tests.
The title for the tests will be TEMP SENSOR OPEN.
When Monitored and Set Condition:
TEMP SENSOR OPEN
When Monitored:
During heater activation and operation.
Set Condition:
This DTC will set if the Temperature Sensor’s resistance is not within the
expected parameters.
TEMP SENSOR SHORTED
When Monitored:
During heater activation and operation.
Set Condition:
This DTC will set if the Temperature Sensor’s resistance is not within the
expected parameters.
POSSIBLE CAUSES
TEMPERATURE SENSOR
TEST
ACTION
APPLICABILITY
1
WARNING: NEVER OPERATE THE HEATER IN AN ENCLOSED AREA
THAT DOES NOT HAVE EXHAUST VENTILATION FACILITIES. ALWAYS
VENT THE EXHAUST WHEN OPERATING THE HEATER. FAILURE TO
FOLLOW THESE INSTRUCTIONS CAN RESULT IN PERSONAL INJURY
OR DEATH.
WARNING: ALLOW THE HEATER ASSEMBLY TO COOL BEFORE PER-
FORMING A COMPONENT INSPECTION/REPAIR/REPLACEMENT. FAIL-
URE TO FOLLOW THESE INSTRUCTIONS CAN RESULT IN PERSONAL
INJURY OR DEATH.
CAUTION: DO NOT PERFORM THIS TEST UNLESS DIRECTED HERE BY
THE HEATER PRE-TEST. ALWAYS PERFORM THE HEATER PRE-TEST
PRIOR TO PERFORMING ANY OTHER TEST FOR THE RESULT TO BE
VALID.
Turn the ignition off.
View repair
All
Repair
Replace the Cabin Heater Assembly or Heater Booster Assembly
in accordance with the Service Information.
Perform HEATER VERIFICATION TEST - VER 1.
98
CABIN HEATER
Symptom:
UNDER VOLTAGE
When Monitored and Set Condition:
UNDER VOLTAGE
When Monitored:
With the engine running.
Set Condition:
This DTC will set if the heater’s power supply voltage drops below 10.2
volts for longer than 20 seconds.
POSSIBLE CAUSES
VEHICLE’S BATTERY SYSTEM
VEHICLE’S CHARGING SYSTEM NOT OPERATING PROPERLY
CABIN HEATER OR HEATER BOOSTER CONTROL UNIT
FUSED B+ CIRCUIT HIGH RESISTANCE
CABIN HEATER OR HEATER BOOSTER CONTROL UNIT
TEST
ACTION
APPLICABILITY
1
WARNING: NEVER OPERATE THE HEATER IN AN ENCLOSED AREA
THAT DOES NOT HAVE EXHAUST VENTILATION FACILITIES. ALWAYS
VENT THE EXHAUST WHEN OPERATING THE HEATER. FAILURE TO
FOLLOW THESE INSTRUCTIONS CAN RESULT IN PERSONAL INJURY
OR DEATH.
Turn the ignition off.
Inspect the vehicle’s battery terminals, cable terminals, and cables for corrosion and
damage in accordance with the Service Information.
Test the vehicle’s battery in accordance with the Service Information.
Is the vehicle’s battery system Ok?
All
Yes
→ Go To 2
No
→ Clean/repair the vehicle’s battery system in accordance with the
Service Information.
Perform HEATER VERIFICATION TEST - VER 1.
2
WARNING: NEVER OPERATE THE HEATER IN AN ENCLOSED AREA
THAT DOES NOT HAVE EXHAUST VENTILATION FACILITIES. ALWAYS
VENT THE EXHAUST WHEN OPERATING THE HEATER. FAILURE TO
FOLLOW THESE INSTRUCTIONS CAN RESULT IN PERSONAL INJURY
OR DEATH.
Check the vehicle’s charging system for proper operation in accordance with the
Service Information.
Is the vehicle’s charging system operating properly?
All
Yes
→ Go To 3
No
→ Repair the vehicle’s charging system in accordance with the
Service Information.
Perform HEATER VERIFICATION TEST - VER 1.
99
CABIN HEATER
TEST
ACTION
APPLICABILITY
3
WARNING: NEVER OPERATE THE HEATER IN AN ENCLOSED AREA
THAT DOES NOT HAVE EXHAUST VENTILATION FACILITIES. ALWAYS
VENT THE EXHAUST WHEN OPERATING THE HEATER. FAILURE TO
FOLLOW THESE INSTRUCTIONS CAN RESULT IN PERSONAL INJURY
OR DEATH.
WARNING: ALLOW THE HEATER ASSEMBLY TO COOL BEFORE PER-
FORMING A COMPONENT INSPECTION/REPAIR/REPLACEMENT. FAIL-
URE TO FOLLOW THESE INSTRUCTIONS CAN RESULT IN PERSONAL
INJURY OR DEATH.
Turn the ignition on.
With the DRBIII
t in Sensors, record the Cabin Heater’s or Heater Booster’s
Operating Voltage.
NOTE: Check connectors - Clean/repair as necessary.
Disconnect the Cabin Heater or Heater Booster harness connector.
Measure the voltage between the Fused B+ circuit and ground.
Is there more than 1.0 volt difference between the Operating Voltage and the Fused
B+ voltage?
All
Yes
→ Replace the Cabin Heater Assembly or Heater Booster Assembly
in accordance with the Service Information.
Perform HEATER VERIFICATION TEST - VER 1.
No
→ Go To 4
100
CABIN HEATER
UNDER VOLTAGE —
Continued
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