Mercedes-Benz Sprinter / Dodge Sprinter. Manual — part 35
TEST
ACTION
APPLICABILITY
4
Turn the ignition off.
Disconnect the Air Outlet Temperature Sensor harness connector.
Disconnect the Automatic Temperature Control (ATC) C1 harness connector.
Measure the resistance between the Air Outlet Temperature Sensor Signal circuit
and the Sensor Ground circuit.
Is the resistance below 10k ohms?
All
Yes
→ Repair the Air Outlet Temperature Sensor Signal circuit for a
short to the Sensor Ground circuit.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Replace the Automatic Temperature Control (ATC) in accordance
with the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
137
HEATING & A/C
AIR OUTLET TEMP SENSOR SHORTED LOW (ACTIVE) —
Continued
Symptom List:
ATC FUNCTION TEST COOL FAILURE
ATC FUNCTION TEST FAILURE
ATC FUNCTION TEST HEAT FAILURE
Test Note:
All symptoms listed above are diagnosed using the same tests.
The title for the tests will be ATC FUNCTION TEST COOL
FAILURE.
When Monitored and Set Condition:
ATC FUNCTION TEST COOL FAILURE
When Monitored:
With the engine running.
Set Condition:
This DTC will set if specific operating criteria are not met when
attempting to run the ATC Function Test.
ATC FUNCTION TEST FAILURE
When Monitored:
With the engine running.
Set Condition:
This DTC will set if specific operating criteria are not met when
attempting to run the ATC Function Test.
ATC FUNCTION TEST HEAT FAILURE
When Monitored:
With the engine running.
Set Condition:
This DTC will set if specific operating criteria are not met when
attempting to run the ATC Function Test.
POSSIBLE CAUSES
ATC FUNCTION TEST OPERATING CRITERIA NOT MET
AUTOMATIC TEMPERATURE CONTROL (ATC) DTC(S) PRESENT
ENGINE CONTROL MODULE DTC(S) PRESENT
CRITERIA TO RUN ATC FUNCTION TEST NOT MET AND NO DTCS PRESENT
138
HEATING & A/C
TEST
ACTION
APPLICABILITY
1
Verify that all of the following criteria was met when attempting to run the ATC
Function Test.
The vehicle was stationary.
The engine was running.
The air conditioning switch was On.
The ambient temperature was above 59°F (15°C).
The refrigerant pressure was between 29 and 348 PSI (2 and 24 bar).
The evaporator temperature was above 36.5°F (2.5°C).
The coolant temperature was above 158°F (70°C).
Was all criteria met when attempting to run the ATC Function Test?
All
Yes
→ Go To 2
No
→ Attempt to activate the ATC Function Test when all of the specific
operating criteria are met. If the criteria cannot be met, proceed
to Test 2 of this procedure.
Perform BODY VERIFICATION TEST - VER 1.
2
Turn the ignition on.
With the DRBIII
t, read Automatic Temperature Control DTCs.
Does the DRBIII
t display any DTCs?
All
Yes
→ Return to the Heating & A/C symptom list and choose the
symptom(s).
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 3
3
Turn the ignition on.
With the DRBIII
t, read Engine Control Module DTCs.
Does the DRBIII
t display any DTCs?
All
Yes
→ Refer to Powertrain Diagnostic information for the related symp-
tom(s).
Perform BODY VERIFICATION TEST - VER 1.
No
→ Refer to Service Information to diagnose the system(s) that failed
to meet the ATC Function Test operating criteria.
Perform BODY VERIFICATION TEST - VER 1.
139
HEATING & A/C
ATC FUNCTION TEST COOL FAILURE —
Continued
Symptom:
AUX FAN RELAY CONTROL HIGH OR OPEN (ACTIVE)
POSSIBLE CAUSES
A/C AUXILIARY FAN RELAY HIGH SIDE CONTROL CIRCUIT SHORTED TO VOLTAGE
GROUND CIRCUIT OPEN
A/C AUXILIARY FAN RELAY HIGH SIDE CONTROL CIRCUIT OPEN
A/C AUXILIARY FAN RELAY
AUTOMATIC TEMPERATURE CONTROL (ATC)
TEST
ACTION
APPLICABILITY
1
Turn the ignition off.
NOTE: Check connectors - Clean/repair as necessary.
Remove the A/C Auxiliary Fan Relay from the relay center.
Disconnect the Automatic Temperature Control (ATC) C1 harness connector.
Measure the voltage of the A/C Auxiliary Fan Relay High Side Control circuit.
Is the voltage above 0.2 volts?
All
Yes
→ Repair the A/C Auxiliary Fan Relay High Side Control circuit for
a short to voltage.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 2
2
Turn the ignition off.
NOTE: Check connectors - Clean/repair as necessary.
Remove the A/C Auxiliary Fan Relay from the relay center.
Measure the resistance between ground and the Ground circuit in the relay center
(A/C Auxiliary Fan Relay connector terminal 85).
Is the resistance below 5.0 ohms?
All
Yes
→ Go To 3
No
→ Repair the Ground circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
3
Turn the ignition off.
NOTE: Check connectors - Clean/repair as necessary.
Remove the A/C Auxiliary Fan Relay from the relay center.
Disconnect the Automatic Temperature Control (ATC) C1 harness connector.
Measure the resistance of the A/C Auxiliary Fan Relay High Side Control circuit
between the Automatic Temperature Control (ATC) C1 harness connector and the
relay center (A/C Auxiliary Fan Relay connector terminal 86).
Is the resistance below 5.0 ohms?
All
Yes
→ Go To 4
No
→ Repair the A/C Auxiliary Fan Relay High Side Control circuit for
an open.
Perform BODY VERIFICATION TEST - VER 1.
140
HEATING & A/C
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