Mercedes-Benz Sprinter / Dodge Sprinter. Manual — part 39
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 Circulation Pump harness connector.
Measure the resistance of the Circulation Pump Control circuit between the
Automatic Temperature Control (ATC) C1 harness connector and the Circulation
Pump harness connector.
Is the resistance below 5.0 ohms?
All
Yes
→ Go To 4
No
→ Repair the Circulation Pump 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 Circulation Pump harness connector.
Measure the resistance between ground and the Ground circuit.
Is the resistance below 5.0 ohms?
All
Yes
→ 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.
153
HEATING & A/C
CIRC PUMP CONTROL HIGH OR OPEN (ACTIVE) —
Continued
Symptom:
CIRC PUMP CONTROL SHORTED LOW (ACTIVE)
POSSIBLE CAUSES
CIRCULATION PUMP CONTROL CIRCUIT SHORTED TO GROUND
CIRCULATION PUMP CONTROL CIRCUIT SHORTED TO GROUND CIRCUIT
CIRCULATION PUMP CONTROL CIRCUIT SHORTED TO SENSOR GROUND CIRCUIT
CIRCULATION PUMP
AUTOMATIC TEMPERATURE CONTROL (ATC)
TEST
ACTION
APPLICABILITY
1
Turn the ignition off.
Disconnect the Circulation Pump harness connector.
Disconnect the Automatic Temperature Control (ATC) C1 harness connector.
Measure the resistance between ground and the Circulation Pump Control circuit.
Is the resistance below 10k ohms?
All
Yes
→ Repair the Circulation Pump Control circuit for a short to ground.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 2
2
Turn the ignition off.
Disconnect the Circulation Pump harness connector.
Disconnect the Automatic Temperature Control (ATC) C1 harness connector.
Measure the resistance between the Circulation Pump Control circuit and the
Ground circuit in the Automatic Temperature Control C1 harness connector.
Is the resistance below 10k ohms?
All
Yes
→ Repair the Circulation Pump 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 Circulation Pump harness connector.
Disconnect the Automatic Temperature Control (ATC) C1 harness connector.
Measure the resistance between the Circulation Pump 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 Circulation Pump Control circuit for a short to the
Sensor Ground circuit.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 4
154
HEATING & A/C
TEST
ACTION
APPLICABILITY
4
Turn the ignition off.
Disconnect the Circulation Pump harness connector.
Connect a fused jumper wire between the Battery (+) and Circulation Pump cavity 2.
Connect a jumper wire between ground and Circulation Pump cavity 1.
Does the Circulation Pump run?
All
Yes
→ Replace the Automatic Temperature Control (ATC) in accordance
with the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Replace the Circulation Pump in accordance with the Service
Information.
Perform BODY VERIFICATION TEST - VER 1.
155
HEATING & A/C
CIRC PUMP CONTROL SHORTED LOW (ACTIVE) —
Continued
Symptom:
EVAP TEMP SENSOR HIGH OR OPEN (ACTIVE)
POSSIBLE CAUSES
EVAPORATOR TEMPERATURE SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE
AUTOMATIC TEMPERATURE CONTROL (ATC)
AUTOMATIC TEMPERATURE CONTROL (ATC)
EVAPORATOR TEMPERATURE SENSOR SIGNAL CIRCUIT OPEN
SENSOR GROUND CIRCUIT OPEN
EVAPORATOR TEMPERATURE SENSOR
TEST
ACTION
APPLICABILITY
1
Turn the ignition off.
NOTE: Check connectors - Clean/repair as necessary.
Disconnect the Evaporator Temperature Sensor harness connector.
Turn the ignition on.
While back probing, measure the voltage between the Evaporator Temperature
Sensor Signal circuit and the Sensor Ground circuit.
Is the voltage above 5.3 volts?
All
Yes
→ Go To 2
No
→ Go To 3
2
Turn the ignition off.
NOTE: Check connectors - Clean/repair as necessary.
Disconnect the Evaporator Temperature Sensor harness connector.
Disconnect the Automatic Temperature Control (ATC) C1 harness connector.
Turn the ignition on.
Measure the voltage of the Evaporator Temperature Sensor Signal circuit.
Is the voltage above 0.2 volts?
All
Yes
→ Repair the Evaporator Temperature Sensor Signal 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.
3
Turn the ignition off.
NOTE: Check connectors - Clean/repair as necessary.
Disconnect the Evaporator Temperature Sensor harness connector.
Turn the ignition on.
While back probing, measure the voltage between the Evaporator Temperature
Sensor Signal circuit and Senor Ground circuit in the Automatic Temperature
Control (ATC) C1 harness connector.
Is the voltage above 4.5 volts?
All
Yes
→ Go To 4
No
→ Replace the Automatic Temperature Control (ATC) in accordance
with the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
156
HEATING & A/C
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