Mercedes-Benz Sprinter / Dodge Sprinter. Service manual — part 43
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
Yes
→ 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
Yes
→ 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
Yes
→ 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
Yes
→ 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) —
Continued
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
Yes
→ 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
Yes
→ 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
Yes
→ 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
Yes
→ 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
Yes
→ 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
Yes
→ 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
Yes
→ 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) —
Continued
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