heating MERCEDES-BENZ SPRINTER 2006 Workshop Manual

TEST ACTION APPLICABILITY
4 Turn the ignition off.
Disconnect the Instrument Cluster harness connectors.
Check all of the instrument cluster's power circuits for a short or open condition.
Check all of the instrument cluster's ground circuits for an open condition.
Were any problems found?All
Ye s!Repair the power/ground circuit(s) as necessary.
Perform BODY VERIFICATION TEST - VER 1.
No!Go To 5
5 Turn the ignition off.
Disconnect the Instrument Cluster harness connectors.
Measure the resistance between the CAN C Bus (+) circuit and the CAN C Bus (-)
circuit in the Instrument Cluster harness connector.
Is the resistance 57 to 63 ohms?All
Ye s!Replace the Instrument Cluster in accordance with the Service
Information.
Perform BODY VERIFICATION TEST - VER 1.
No!Repair the CAN C Bus (+)/CAN C Bus (-) circuit(s) for an open.
Perform BODY VERIFICATION TEST - VER 1.
6 Turn the ignition off.
Disconnect the Automatic Temperature Control (ATC) C1 harness connector.
Measure the resistance between the CAN C Bus (+) circuit and the CAN C Bus (-)
circuit in the Automatic Temperature Control (ATC) C1 harness connector.
Is the resistance 57 to 63 ohms?All
Ye s!Replace the Automatic Temperature Control in accordance with
the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
No!Repair the CAN C Bus (+)/CAN C Bus (-) circuit(s) for an open.
Perform BODY VERIFICATION TEST - VER 1.
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HEATING & A/C
NO COMMUNICATION WITH IC (ACTIVE) ÐContinued

Symptom:
RECIRC AIR SOLENOID CONTROL HIGH OR OPEN (ACTIVE)
POSSIBLE CAUSES
RECIRCULATED AIR SOLENOID VALVE
RECIRCULATED AIR SOLENOID VALVE CONTROL CIRCUIT SHORTED TO VOLTAGE
AUTOMATIC TEMPERATURE CONTROL (ATC)
RECIRCULATED AIR SOLENOID VALVE CONTROL CIRCUIT OPEN
GROUND CIRCUIT OPEN
AUTOMATIC TEMPERATURE CONTROL (ATC)
TEST ACTION APPLICABILITY
1 Turn the ignition on.
Press the Air Recirculation switch off.
Turn the ignition off.
NOTE: Check connectors - Clean/repair as necessary.
Disconnect the Recirculated Air Solenoid Valve harness connector.
Connect a 12-volt test light between the Recirculated Air Solenoid Valve Control
circuit and the Ground circuit in the Recirculated Air Solenoid harness connector.
Turn the ignition on. The test light should operate as follows:
With the Air Recirculation switch off, the test light should not illuminate.
Press the Air Recirculation switch on. The test light should illuminate brightly.
Does the test light function as specified?All
Yes, Light Only Illuminates w/Recirc On
Replace the Recirculated Air Solenoid Valve in accordance with
the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
No, Light Illuminates w/Recirc Off
Go To 2
No, Light Will Not Illuminate
Go To 3
2 Turn the ignition off.
NOTE: Check connectors - Clean/repair as necessary.
Disconnect the Recirculated Air Solenoid Valve harness connector.
Disconnect the Automatic Temperature Control (ATC) C1 harness connector.
Turn the ignition on.
Measure the voltage of the Recirculated Air Solenoid Valve Control circuit.
Is the voltage above 0.2 volts?All
Ye s!Repair the Recirculated Air Solenoid Valve Control circuit for a
short to voltage.
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.
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HEATING & A/C

TEST ACTION APPLICABILITY
3 Turn the ignition off.
NOTE: Check connectors - Clean/repair as necessary.
Disconnect the Automatic Temperature Control (ATC) C1 harness connector.
Disconnect the Recirculated Air Solenoid Valve harness connector.
Measure the resistance of the Recirculated Air Solenoid Valve Control circuit
between the Automatic Temperature Control (ATC) C1 harness connector and the
Recirculated Air Solenoid Valve harness connector.
Is the resistance below 5.0 ohms?All
Ye s!Go To 4
No!Repair the Recirculated Air Solenoid Valve Control circuit for an
open.
Perform BODY VERIFICATION TEST - VER 1.
4 Turn the ignition off.
NOTE: Check connectors - Clean/repair as necessary.
Disconnect the Recirculated Air Solenoid Valve harness connector.
Measure the resistance between ground and the Ground circuit.
Is the resistance below 5.0 ohms?All
Ye s!Replace the Automatic Temperature Control (ATC) in accordance
with the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
No!Repair the Ground circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
168
HEATING & A/C
RECIRC AIR SOLENOID CONTROL HIGH OR OPEN (ACTIVE) ÐContinued

Symptom:
RECIRC AIR SOLENOID CONTROL SHORTED LOW (ACTIVE)
POSSIBLE CAUSES
RECIRCULATED AIR SOLENOID VALVE CONTROL CIRCUIT SHORTED TO GROUND
RECIRCULATED AIR SOLENOID VALVE CONTROL CIRCUIT SHORTED TO GROUND CIRCUIT
RECIRCULATED AIR SOLENOID VALVE CONTROL CIRCUIT SHORTED TO SENSOR GROUND
CIRCUIT
AUTOMATIC TEMPERATURE CONTROL (ATC)
RECIRCULATED AIR SOLENOID VALVE
TEST ACTION APPLICABILITY
1 Turn the ignition off.
Disconnect the Recirculated Air Solenoid Valve harness connector.
Disconnect the Automatic Temperature Control (ATC) C1 harness connector.
Measure the resistance between ground and the Recirculated Air Solenoid Valve
Control circuit.
Is the resistance below 10k ohms?All
Ye s!Repair the Recirculated Air Solenoid Valve Control circuit for a
short to ground.
Perform BODY VERIFICATION TEST - VER 1.
No!Go To 2
2 Turn the ignition off.
Disconnect the Recirculated Air Solenoid Valve harness connector.
Disconnect the Automatic Temperature Control (ATC) C1 harness connector.
Measure the resistance between the Recirculated Air Solenoid Valve Control circuit
and the Ground circuit in the Automatic Temperature Control C1 harness connector.
Is the resistance below 10k ohms?All
Ye s!Repair the Recirculated Air Solenoid Valve Control circuit for a
short to the Ground circuit.
Perform BODY VERIFICATION TEST - VER 1.
No!Go To 3
3 Turn the ignition off.
Disconnect the Recirculated Air Solenoid Valve harness connector.
Disconnect the Automatic Temperature Control (ATC) C1 harness connector.
Measure the resistance between the Recirculated Air Solenoid Valve Control circuit
and the Sensor Ground circuit in the Automatic Temperature Control C1 harness
connector.
Is the resistance below 10k ohms?All
Ye s!Repair the Recirculated Air Solenoid Valve Control circuit for a
short to the Sensor Ground circuit.
Perform BODY VERIFICATION TEST - VER 1.
No!Go To 4
169
HEATING & A/C

TEST ACTION APPLICABILITY
4 Turn the ignition off.
NOTE: Check connectors - Clean/repair as necessary.
Reconnect the Automatic Temperature Control (ATC) C1 harness connector.
Disconnect the Recirculated Air Solenoid Valve harness connector.
Turn the ignition on.
Press the Air Recirculation switch off.
Turn the ignition off.
Connect a 12-volt test light between the Recirculated Air Solenoid Valve Control
circuit and the Ground circuit in the Recirculated Air Solenoid harness connector.
Turn the ignition on. The test light should operate as follows:
With the Air Recirculation switch off, the test light should not illuminate.
Press the Air Recirculation switch on. The test light should illuminate brightly.
Does the test light function as specified?All
Ye s!Replace the Recirculated Air Solenoid Valve in accordance with
the Service Information.
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.
170
HEATING & A/C
RECIRC AIR SOLENOID CONTROL SHORTED LOW (ACTIVE) ÐContinued

Symptom:
REFRIG PRESS SENSOR HIGH OR OPEN (ACTIVE)
POSSIBLE CAUSES
5 VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE
REFRIGERANT PRESSURE SENSOR FEEDBACK CIRCUIT SHORTED TO VOLTAGE
5 VOLT SUPPLY CKT SHORTED TO REFRIGERANT PRESSURE SENSOR FEEDBACK CKT
AUTOMATIC TEMPERATURE CONTROL (ATC)
5 VOLT SUPPLY CIRCUIT OPEN
REFRIGERANT PRESSURE SENSOR FEEDBACK CIRCUIT OPEN
SENSOR GROUND CIRCUIT OPEN
REFRIGERANT PRESSURE SENSOR
TEST ACTION APPLICABILITY
1 Turn the ignition off.
NOTE: Check connectors - Clean/repair as necessary.
Disconnect the Automatic Temperature Control (ATC) C1 harness connector.
Turn the ignition on.
Measure the voltage of the 5 Volt Supply circuit.
Is the voltage above 0.2 volts?All
Ye s!Repair the 5 Volt Supply 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.
Disconnect the Automatic Temperature Control (ATC) C1 harness connector.
Turn the ignition on.
Measure the voltage of the Refrigerant Pressure Sensor Feedback circuit.
Is the voltage above 0.2 volts?All
Ye s!Repair the Refrigerant Pressure Sensor Feedback circuit for a
short to voltage.
Perform BODY VERIFICATION TEST - VER 1.
No!Go To 3
3 Turn the ignition off.
NOTE: Check connectors - Clean/repair as necessary.
Disconnect the Refrigerant Pressure Sensor harness connector.
Disconnect the Automatic Temperature Control (ATC) C1 harness connector.
Measure the resistance between the 5 Volt Supply circuit and the Refrigerant
Pressure Sensor Feedback circuit.
Is the resistance below 10k ohms?All
Ye s!Repair the 5 Volt Supply circuit for a short to the Refrigerant
Pressure Sensor Feedback circuit.
Perform BODY VERIFICATION TEST - VER 1.
No!Go To 4
171
HEATING & A/C

TEST ACTION APPLICABILITY
4 Turn the ignition off.
NOTE: Check connectors - Clean/repair as necessary.
Reconnect the Automatic Temperature Control (ATC) C1 harness connector.
Turn the ignition on.
While back probing, measure the voltage between the 5 Volt Supply circuit and
ground.
While back probing, measure the voltage between the Refrigerant Pressure Sensor
Feedback circuit and ground.
Is the voltage above 5.3 volts on either circuit?All
Ye s!Replace the Automatic Temperature Control (ATC) in accordance
with the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
No!Go To 5
5 Turn the ignition off.
NOTE: Check connectors - Clean/repair as necessary.
Disconnect the Refrigerant Pressure Sensor harness connector.
Disconnect the Automatic Temperature Control (ATC) C1 harness connector.
Measure the resistance of the 5 Volt Supply circuit between the Automatic Temper-
ature Control (ATC) C1 harness connector and the Refrigerant Pressure Sensor
harness connector.
Is the resistance below 5.0 ohms?All
Ye s!Go To 6
No!Repair the 5 Volt Supply circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
6 Turn the ignition off.
NOTE: Check connectors - Clean/repair as necessary.
Disconnect the Refrigerant Pressure Sensor harness connector.
Disconnect the Automatic Temperature Control (ATC) C1 harness connector.
Measure the resistance of the Refrigerant Pressure Sensor Feedback circuit between
the Automatic Temperature Control (ATC) C1 harness connector and the Refrigerant
Pressure Sensor harness connector.
Is the resistance below 5.0 ohms?All
Ye s!Go To 7
No!Repair the Refrigerant Pressure Sensor Feedback circuit for an
open.
Perform BODY VERIFICATION TEST - VER 1.
7 Turn the ignition off.
NOTE: Check connectors - Clean/repair as necessary.
Disconnect the Refrigerant Pressure Sensor harness connector.
Disconnect the Automatic Temperature Control (ATC) C1 harness connector.
Measure the resistance of the Sensor Ground circuit between the Automatic
Temperature Control (ATC) C1 harness connector and the Refrigerant Pressure
Sensor harness connector.
Is the resistance below 5.0 ohms?All
Ye s!Replace the Refrigerant Pressure Sensor in accordance with the
Service Information.
Perform BODY VERIFICATION TEST - VER 1.
No!Repair the Sensor Ground circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
172
HEATING & A/C
REFRIG PRESS SENSOR HIGH OR OPEN (ACTIVE) ÐContinued

Symptom:
REFRIG PRESS SENSOR SHORTED LOW (ACTIVE)
POSSIBLE CAUSES
REFRIGERANT PRESSURE SENSOR
5 VOLT SUPPLY CIRCUIT SHORTED TO GROUND
5 VOLT SUPPLY CIRCUIT SHORTED TO GROUND CIRCUIT
5 VOLT SUPPLY CIRCUIT SHORTED TO SENSOR GROUND CIRCUIT
REFRIGERANT PRESSURE SENSOR FEEDBACK CIRCUIT SHORTED TO GROUND
REFRIGERANT PRESSURE SENSOR FEEDBACK CIRCUIT SHORTED TO GROUND CIRCUIT
REFRIGERANT PRESSURE SENSOR FEEDBACK CIRCUIT SHORTED TO SENSOR GROUND
CIRCUIT
AUTOMATIC TEMPERATURE CONTROL (ATC)
TEST ACTION APPLICABILITY
1 Turn the ignition off.
Disconnect the Refrigerant Pressure Sensor harness connector.
NOTE: All of the following criteria must be met in order to successfully run
the ATC Function Test.
Place the shift lever in Park.
Turn the ignition on.
With the DRBIIIt, record and erase ATC DTC's.
Start the engine. Allow the engine to reach normal operating temperature.
Set the blower to high speed.
Press the Air Conditioning switch On.
With the DRBIIIt, verify that the ambient temperature is above 59ÉF (15ÉC), the
refrigerant pressure is between 29 and 348 PSI (2 and 24 bar), the evaporator
temperature is above 36.5ÉF (2.5ÉC), and the coolant temperature is above 158ÉF
(70ÉC).
With the DRBIIItin Automatic Temperature Control (ATC), select System Tests and
select ATC Function Test. When the ATC Function Test is complete, proceed as
follows:
With the DRBIIIt, read the active ATC DTCs.
Does the DRBIIItdisplay: REFRIG PRESS SENSOR SHORTED LOW?All
Ye s!Go To 2
No!Replace the Refrigerant Pressure Sensor in accordance with the
Service Information.
Perform BODY VERIFICATION TEST - VER 1.
2 Turn the ignition off.
Disconnect the Automatic Temperature Control (ATC) C1 harness connector.
Measure the resistance between ground and the 5 Volt Supply circuit.
Is the resistance below 10k ohms?All
Ye s!Repair the 5 Volt Supply circuit for a short to ground.
Perform BODY VERIFICATION TEST - VER 1.
No!Go To 3
173
HEATING & A/C

TEST ACTION APPLICABILITY
3 Turn the ignition off.
Disconnect the Automatic Temperature Control (ATC) C1 harness connector.
Measure the resistance between the 5 Volt Supply circuit and the Ground circuit.
Is the resistance below 10k ohms?All
Ye s!Repair the 5 Volt Supply circuit for a short to the Ground circuit.
Perform BODY VERIFICATION TEST - VER 1.
No!Go To 4
4 Turn the ignition off.
Disconnect the Refrigerant Pressure Sensor harness connector.
Disconnect the Automatic Temperature Control (ATC) C1 harness connector.
Measure the resistance between the 5 Volt Supply circuit and the Sensor Ground
circuit.
Is the resistance below 10k ohms?All
Ye s!Repair the 5 Volt Supply circuit for a short to the Sensor Ground
circuit.
Perform BODY VERIFICATION TEST - VER 1.
No!Go To 5
5 Turn the ignition off.
Disconnect the Automatic Temperature Control (ATC) C1 harness connector.
Measure the resistance between ground and the Refrigerant Pressure Sensor
Feedback circuit.
Is the resistance below 10k ohms?All
Ye s!Repair the Refrigerant Pressure Sensor Feedback circuit for a
short to ground.
Perform BODY VERIFICATION TEST - VER 1.
No!Go To 6
6 Turn the ignition off.
Disconnect the Automatic Temperature Control (ATC) C1 harness connector.
Measure the resistance between the Refrigerant Pressure Sensor Feedback circuit
and the Ground circuit.
Is the resistance below 10k ohms?All
Ye s!Repair the Refrigerant Pressure Sensor Feedback circuit for a
short to the Ground circuit.
Perform BODY VERIFICATION TEST - VER 1.
No!Go To 7
7 Turn the ignition off.
Disconnect the Refrigerant Pressure Sensor harness connector.
Disconnect the Automatic Temperature Control (ATC) C1 harness connector.
Measure the resistance between the Refrigerant Pressure Sensor Feedback circuit
and the Sensor Ground circuit.
Is the resistance below 10k ohms?All
Ye s!Repair the Refrigerant Pressure Sensor Feedback 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.
174
HEATING & A/C
REFRIG PRESS SENSOR SHORTED LOW (ACTIVE) ÐContinued

Symptom:
WATER CYCLE VALVE CONTROL HIGH OR OPEN (ACTIVE)
POSSIBLE CAUSES
WATER CYCLE VALVE
WATER CYCLE VALVE CONTROL CIRCUIT SHORTED TO VOLTAGE
AUTOMATIC TEMPERATURE CONTROL (ATC)
WATER CYCLE VALVE CONTROL CIRCUIT OPEN
GROUND CIRCUIT OPEN
AUTOMATIC TEMPERATURE CONTROL (ATC)
TEST ACTION APPLICABILITY
1 Turn the ignition off.
Press the Residual Engine Heat Utilization (REST) switch off.
NOTE: Check connectors - Clean/repair as necessary.
Disconnect the Water Cycle Valve harness connector.
Connect a 12-volt test light between the Water Cycle Valve Control circuit and the
Ground circuit in the Water Cycle Valve harness connector. The test light should
operate as follows:
With the Residual Engine Heat Utilization (REST) switch off, the test light should
not illuminate.
Press the Residual Engine Heat Utilization (REST) switch on.
With the Blend control set to Full Cold, the test light should illuminate brightly and
continuously.
With the Blend control set to one position below the half Cold/Hot setting, the test
light should illuminate brightly and blink at a slow continuous rate.
With the Blend control set to the half Cold/Hot setting or above, the test light should
be off.
Does the test light operate as specified?All
Ye s!Replace the Water Cycle Valve in accordance with the Service
Information.
Perform BODY VERIFICATION TEST - VER 1.
No, Light Illuminates With REST Off.
Go To 2
No, Light Will Not Illuminate
Go To 3
No, Light Won't Correspond To Blend
Go To 3
175
HEATING & A/C