service MERCEDES-BENZ SPRINTER 2006 Service Manual

TEST ACTION APPLICABILITY
4 Turn the ignition off.
NOTE: Check connectors - Clean/repair as necessary.
Disconnect the Automatic Temperature Control (ATC) C1 harness connector.
Disconnect the Evaporator Temperature Sensor harness connector.
Measure the resistance of the Evaporator Temperature Sensor Signal circuit between
the Automatic Temperature Control (ATC) C1 harness connector and the Evaporator
Temperature Sensor harness connector.
Is the resistance below 5.0 ohms?All
Ye s!Go To 5
No!Repair the Evaporator Temperature Sensor Signal circuit for an
open.
Perform BODY VERIFICATION TEST - VER 1.
5 Turn the ignition off.
NOTE: Check connectors - Clean/repair as necessary.
Disconnect the Automatic Temperature Control (ATC) C1 harness connector.
Disconnect the Evaporator Temperature Sensor harness connector.
Measure the resistance of the Sensor Ground circuit between the Automatic
Temperature Control (ATC) C1 harness connector and the Evaporator Temperature
Sensor harness connector.
Is the resistance below 5.0 ohms?All
Ye s!Replace the Evaporator Temperature 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.
157
HEATING & A/C
EVAP TEMP SENSOR HIGH OR OPEN (ACTIVE) ÐContinued

Symptom:
EVAP TEMP SENSOR SHORTED LOW (ACTIVE)
POSSIBLE CAUSES
EVAPORATOR TEMPERATURE SENSOR
EVAP TEMP SENSOR SIGNAL CIRCUIT SHORTED TO GROUND
EVAP TEMP SENSOR SIGNAL CIRCUIT SHORTED TO GROUND CIRCUIT
EVAP TEMP SENSOR SIGNAL CIRCUIT SHORTED TO SENSOR GROUND CIRCUIT
AUTOMATIC TEMPERATURE CONTROL (ATC)
TEST ACTION APPLICABILITY
1 Turn the ignition off.
Disconnect the Evaporator Temperature Sensor harness connector.
Turn the ignition on.
With the DRBIIIt, record and erase Automatic Temperature Control DTCs.
Turn the ignition off, wait 5 seconds, then turn the ignition on.
With the DRBIIIt, read the Automatic Temperature Control DTCs.
Does the DRBIIItdisplay: EVAP TEMP SENSOR HIGH OR OPEN?All
Ye s!Replace the Evaporator Temperature Sensor in accordance with
the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
No!Go To 2
2 Turn the ignition off.
Disconnect the Automatic Temperature Control (ATC) C1 harness connector.
Measure the resistance between ground and the Evaporator Temperature Sensor
Signal circuit.
Is the resistance below 10k ohms?All
Ye s!Repair the Evaporator Temperature Sensor Signal circuit for a
short to ground.
Perform BODY VERIFICATION TEST - VER 1.
No!Go To 3
3 Turn the ignition off.
Disconnect the Automatic Temperature Control (ATC) C1 harness connector.
Measure the resistance between the Evaporator Temperature Sensor Signal circuit
and the Ground circuit.
Is the resistance below 10k ohms?All
Ye s!Repair the Evaporator Temperature Sensor Signal circuit for a
short to the Ground circuit.
Perform BODY VERIFICATION TEST - VER 1.
No!Go To 4
158
HEATING & A/C

TEST ACTION APPLICABILITY
4 Turn the ignition off.
Disconnect the Automatic Temperature Control (ATC) C1 harness connector.
Disconnect the Evaporator Temperature Sensor harness connector.
Measure the resistance between the Evaporator Temperature Sensor Signal circuit
and the Sensor Ground circuit.
Is the resistance below 10k ohms?All
Ye s!Repair the Evaporator 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.
159
HEATING & A/C
EVAP TEMP SENSOR SHORTED LOW (ACTIVE) ÐContinued

TEST ACTION APPLICABILITY
2 Turn the ignition off.
Using a voltmeter, connect one end to the CAN circuit that previously measured
above 3.0 volts, and the other end to ground.
NOTE: Refer to the wiring diagrams in the service information to help
determine which modules are connected to the CAN Bus.
NOTE: Wait one minute, after turning the ignition off, before disconnecting
the module.
Disconnect a module that is connected to the CAN bus.
Turn the ignition on.
Monitor and note the voltmeter reading.
Repeat this procedure until either the voltage reading drops below 3.0 volts or all
modules that are connected to the CAN Bus are disconnected and the voltage reading
remains above 3.0 volts. Then, proceed to the conclusion question.
What is the outcome?All
> 3.0 volts w/all modules disconnected
Repair the CAN C Bus (+) circuit or the CAN C Bus (-) circuit for
a short to voltage.
Perform BODY VERIFICATION TEST - VER 1.
< 3.0 volts after disconnecting a module
Replace the module that caused the voltage reading to drop after
disconnecting it.
Perform BODY VERIFICATION TEST - VER 1.
3 Turn the ignition off.
Disconnect the Instrument Cluster harness connectors.
Disconnect the negative battery cable.
Measure the resistance between ground and the CAN C Bus (+) circuit.
Measure the resistance between ground and the CAN C Bus (-) circuit.
Is the resistance below 50.0 ohms on either circuit?All
Ye s!Go To 4
No!Go To 5
4 Turn the ignition off.
Disconnect the negative battery cable.
Using an ohmmeter, connect one end to the CAN Bus circuit that previously
measured below 50.0 ohms and the other end to ground.
NOTE: Refer to the wiring diagrams in the service information to help
determine which modules are connected to the CAN Bus.
Disconnect a module that is connected to the CAN Bus.
Monitor and note the ohmmeter reading.
Repeat this procedure until either the resistance reading goes above 50.0 ohms or all
modules that are connected to the CAN Bus are disconnected and the resistance
reading remains below 50.0 ohms. Then, proceed to the conclusion question.
What is the outcome?All
< 50.0 ohms w/all modules disconnected
Repair the CAN C Bus (+) circuit or the CAN C Bus (-) circuit for
a short to ground.
Perform BODY VERIFICATION TEST - VER 1.
>50.0 ohms after disconnecting a module
Replace the module that caused the resistance reading to increase
after disconnecting it.
Perform BODY VERIFICATION TEST - VER 1.
161
HEATING & A/C
NO COMMUNICATION BUS (ACTIVE) ÐContinued

TEST ACTION APPLICABILITY
5 Turn the ignition off.
Disconnect the negative battery cable.
NOTE: Refer to the wiring diagrams in the service information to help
determine which modules are connected to the CAN Bus.
Disconnect all of the modules that are connected to the CAN Bus.
Measure the resistance between the CAN C Bus (+) circuit and the CAN C Bus (-)
circuit at any disconnected module's harness connector.
Is the resistance below 10k ohms?All
Ye s!Repair the CAN C Bus (+) circuit for a short to the CAN C Bus (-)
circuit.
Perform BODY VERIFICATION TEST - VER 1.
No!Go To 6
6 Turn the ignition off.
Reconnect the Engine Control Module harness connectors.
While back probing, measure the resistance of the CAN C Bus (+) circuit and the
CAN C Bus (-) circuit at the ECM harness connector.
Is the resistance 120.0   2.0 ohms?All
Ye s!Replace the Sentry Key Remote Entry Module in accordance with
the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
No!Replace the Engine Control Module in accordance with the
Service Information.
Perform BODY VERIFICATION TEST - VER 1.
162
HEATING & A/C
NO COMMUNICATION BUS (ACTIVE) ÐContinued

TEST ACTION APPLICABILITY
4 Turn the ignition off.
Disconnect the Engine Control Module harness connectors.
Check all of the engine control module's power circuits for a short or open condition.
Check all of the engine control module'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 Engine Control Module harness connectors.
Measure the resistance between the CAN C Bus (+) circuit and the CAN C Bus (-)
circuit in the Engine Control Module harness connector.
Is the resistance 57 to 63 ohms?All
Ye s!Replace the Engine Control Module 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.
164
HEATING & A/C
NO COMMUNICATION WITH ECM (ACTIVE) ÐContinued

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.
166
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.
167
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

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