Dodge Sprinter. Manual — part 398
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 Cabin Heater or Heater Booster harness connector.
Measure the resistance of the Cabin Heater Control circuit between the Automatic
Temperature Control (ATC) C1 harness connector and the Cabin Heater or Heater
Booster harness connector (as applicable).
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 Cabin Heater Control circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
149
HEATING & A/C
CABIN HEATER CONTROL HIGH OR OPEN (ACTIVE) —
Continued
Symptom:
CABIN HEATER CONTROL SHORTED LOW (ACTIVE)
POSSIBLE CAUSES
CABIN HEATER OR HEATER BOOSTER CONTROL UNIT
CABIN HEATER CONTROL CIRCUIT SHORTED TO GROUND
CABIN HEATER CONTROL CIRCUIT SHORTED TO GROUND CIRCUIT
CABIN HEATER CONTROL CIRCUIT SHORTED TO SENSOR GROUND CIRCUIT
AUTOMATIC TEMPERATURE CONTROL (ATC)
TEST
ACTION
APPLICABILITY
1
Turn the ignition off.
Disconnect the Cabin Heater or Heater Booster 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 DRBIII
t, 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 DRBIII
t, verify that the ambient temperature is above 59°F (15°C), the
refrigerant pressure is between 29 and 348 PSI (2 and 24 bar), the evaporator
temperature is above 36.5°F (2.5°C), and the coolant temperature is above 158°F
(70°C).
With the DRBIII
t in Automatic Temperature Control (ATC), select System Tests and
select ATC Function Test. When the ATC Function Test is complete, proceed as
follows:
With the DRBIII
t, read the active ATC DTCs.
Does the DRBIII
t display: CABIN HEATER CONTROL SHORTED LOW?
All
Yes
→ Go To 2
No
→ Replace the Cabin Heater Assembly or the Heater Booster assem-
bly in accordance with the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
2
Turn the ignition off.
Disconnect the Cabin Heater or Heater Booster harness connector.
Disconnect the Automatic Temperature Control (ATC) C1 harness connector.
Measure the resistance between ground and the Cabin Heater Control circuit.
Is the resistance below 30k ohms?
All
Yes
→ Repair the Cabin Heater Control circuit for a short to ground.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 3
150
HEATING & A/C
TEST
ACTION
APPLICABILITY
3
Turn the ignition off.
Disconnect the Cabin Heater or Heater Booster harness connector.
Disconnect the Automatic Temperature Control (ATC) C1 harness connector.
Measure the resistance between the Cabin Heater Control circuit and the Ground
circuit in the Automatic Temperature Control (ATC) C1 harness connector.
Is the resistance below 30k ohms?
All
Yes
→ Repair the Cabin Heater Control 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 Cabin Heater or Heater Booster harness connector.
Disconnect the Automatic Temperature Control (ATC) C1 harness connector.
Measure the resistance between the Cabin Heater Control circuit and the Sensor
Ground circuit in the Automatic Temperature Control (ATC) C1 harness connector.
Is the resistance below 30k ohms?
All
Yes
→ Repair the Cabin Heater Control 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.
151
HEATING & A/C
CABIN HEATER CONTROL SHORTED LOW (ACTIVE) —
Continued
Symptom:
CIRC PUMP CONTROL HIGH OR OPEN (ACTIVE)
POSSIBLE CAUSES
CIRCULATION PUMP
CIRCULATION PUMP CONTROL CIRCUIT SHORTED TO VOLTAGE
AUTOMATIC TEMPERATURE CONTROL (ATC)
CIRCULATION PUMP 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 Circulation Pump harness connector.
Connect a 12-volt test light between the Circulation Pump Control circuit and the
Ground circuit in the Circulation Pump 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. The test light should
illuminate brightly.
Does the test light function as specified?
All
Yes, Light Only Illuminates With REST On
Replace the Circulation Pump in accordance with the Service
Information.
Perform BODY VERIFICATION TEST - VER 1.
No, Light Illuminates With REST Off
No, Light Will Not Illuminate
2
Turn the ignition off.
NOTE: Check connectors - Clean/repair as necessary.
Disconnect the Circulation Pump harness connector.
Disconnect the Automatic Temperature Control (ATC) C1 harness connector.
Turn the ignition on.
Measure the voltage of the Circulation Pump Control circuit.
Is the voltage above 0.2 volts?
All
Yes
→ Repair the Circulation Pump 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.
152
HEATING & A/C
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