Mercedes-Benz Sprinter / Dodge Sprinter. Manual - part 23

TEST

ACTION

APPLICABILITY

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: ALWAYS SWITCH THE HEATER OFF PRIOR TO REFUELING
THE VEHICLE. FAILURE TO FOLLOW THESE INSTRUCTIONS CAN RE-
SULT 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.
Verify that there is more than an 1/8 of a tank of fuel in the vehicle’s fuel tank.
Is there more than an 1/8 of a tank of fuel in the vehicle’s fuel tank?

All

Yes

→ Go To 2

→ Add fuel to the vehicle’s fuel tank to bring the fuel level above 1/8

of a tank.
Perform HEATER VERIFICATION TEST - VER 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.
Turn the ignition off.
Inspect the heater’s fuel line exterior for restrictions, leakage, and damage.
Verify that the heater’s fuel line is installed correctly.
NOTE: Waxed fuel can obstruct the fuel line and reduce flow. Check for the
appropriate winter grade fuel and replace as necessary.
Check for obstructions in the heater’s fuel line. Refer to Fuel Line, Cleaning in the
Service Information.
Is the heater’s fuel line Ok?

All

Yes

→ Go To 3

→ Repair the heater’s fuel line as necessary in accordance with the

Service Information.
Perform HEATER VERIFICATION TEST - VER 1.

CABIN HEATER

FLAME OUT —

Continued

TEST

ACTION

APPLICABILITY

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 off.
Disconnect the fuel line from the fuel outlet side of the Dosing Pump.
Using a suitable length of fuel line, connect one end to the fuel outlet side of the
Dosing Pump and place the other end in a suitable container.
Turn the ignition on.
CAUTION: For the result of this test to be valid, the vehicle’s battery must
be fully charged.
CAUTION: For the result of the Dosing Pump OUTPUT test to be valid,
actuate Dosing Pump PRIME if the heater’s fuel supply line was drained &
then not primed. Remove any fuel in the container before performing the
Dosing Pump OUTPUT test.
If the heater’s fuel supply line was drained and then not primed, with the DRBIII

in System Tests, actuate Dosing Pump PRIME. Otherwise, proceed to the next step
of this procedure.
With the DRBIII

t in System Tests, select Dosing Pump OUTPUT. Allow the Dosing

Pump Output test to run the full 90 seconds. When the Dosing Pump Output test is
complete, measure the amount of fuel in the container.
Does the dosing pump output 422 - 636 cc (14.26 - 21.5 oz) in 90 seconds?

All

Yes

→ Go To 4

→ Replace the Dosing Pump in accordance with the Service Infor-

mation.
Perform HEATER VERIFICATION TEST - VER 1.

All

Yes

→ Replace the Cabin Heater Assembly or Heater Booster Assembly

in accordance with the Service Information.
Perform HEATER VERIFICATION TEST - VER 1.

→ Repair the heater’s air intake/exhaust as necessary in accordance

with the Service Information.
Perform HEATER VERIFICATION TEST - VER 1.

CABIN HEATER

FLAME OUT —

Continued

Symptom List:

FLAME SENSOR OPEN
FLAME SENSOR SHORTED
GLOW PIN OPEN
GLOW PIN SHORTED

Test Note:

All symptoms listed above are diagnosed using the same tests.

The title for the tests will be FLAME SENSOR OPEN.

When Monitored and Set Condition:

FLAME SENSOR OPEN

When Monitored:

During heater activation and operation.

Set Condition:

This DTC will set if the Flame Sensor’s resistance is not within the

expected parameters.

FLAME SENSOR SHORTED

When Monitored:

During heater activation and operation.

Set Condition:

This DTC will set if the Flame Sensor’s resistance is not within the

expected parameters.

GLOW PIN OPEN

When Monitored:

During heater activation and operation.

Set Condition:

This DTC will set if the Glow Pin’s resistance is not within the expected

parameters.

GLOW PIN SHORTED

When Monitored:

During heater activation and operation.

Set Condition:

This DTC will set if the Glow Pin’s resistance is not within the expected

parameters.

POSSIBLE CAUSES

FLAME SENSOR

CABIN HEATER

TEST

ACTION

APPLICABILITY

All

Repair

Replace the Cabin Heater Assembly or Heater Booster Assembly
in accordance with the Service Information.
Perform HEATER VERIFICATION TEST - VER 1.

CABIN HEATER

FLAME SENSOR OPEN —

Continued

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