Dodge Sprinter. Manual — part 396
TEST
ACTION
APPLICABILITY
4
Turn the ignition off.
NOTE: Check connectors - Clean/repair as necessary.
Reconnect the Automatic Temperature Control (ATC) C1 harness connector.
Install a substitute relay in place of the A/C Auxiliary Fan Relay.
Turn the ignition on.
With the DRBIII
t, erase Automatic Temperature Control DTCs.
Turn the ignition off, wait 5 seconds, then turn the ignition on.
With the DRBIII
t, read Automatic Temperature Control DTCs.
Does the DRBIII
t display: AUX FAN RELAY CONTROL HIGH OR OPEN?
All
Yes
→ Replace the Automatic Temperature Control (ATC) in accordance
with the Service Information. Reinstall the original A/C Auxiliary
Fan Relay.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Replace the original A/C Auxiliary Fan Relay in accordance with
the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
141
HEATING & A/C
AUX FAN RELAY CONTROL HIGH OR OPEN (ACTIVE) —
Continued
Symptom:
AUX FAN RELAY CONTROL SHORTED LOW (ACTIVE)
POSSIBLE CAUSES
A/C AUXILIARY FAN RELAY
A/C AUXILIARY FAN RELAY HIGH SIDE CONTROL CIRCUIT SHORTED TO GROUND
A/C AUXILIARY FAN RELAY HIGH SIDE CONTROL CIRCUIT SHORTED TO GROUND CIRCUIT
AUTOMATIC TEMPERATURE CONTROL (ATC)
A/C AUXILIARY FAN RELAY HIGH SIDE CONTROL CKT SHORTED TO SENSOR GROUND CKT
TEST
ACTION
APPLICABILITY
1
Turn the ignition off.
Install a substitute relay in place of the A/C Auxiliary Fan Relay.
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: AUX FAN RELAY CONTROL SHORTED LOW?
All
Yes
→ Go To 2
No
→ Replace the original A/C Auxiliary Fan Relay in accordance with
the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
2
Turn the ignition off.
Remove the substitute A/C Auxiliary Fan Relay from the relay center.
Disconnect the Automatic Temperature Control (ATC) C1 harness connector.
Measure the resistance between ground and the A/C Auxiliary Fan Relay High Side
Control circuit.
Is the resistance below 10K ohms?
All
Yes
→ Repair the A/C Auxiliary Fan Relay High Side Control circuit for
a short to ground. Reinstall the original A/C Auxiliary Fan Relay.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 3
142
HEATING & A/C
TEST
ACTION
APPLICABILITY
3
Turn the ignition off.
Remove the A/C Auxiliary Fan Relay from the relay center.
Disconnect the Automatic Temperature Control (ATC) C1 harness connector.
Measure the resistance between the A/C Auxiliary Fan Relay High Side Control
circuit and the Ground circuit in the Automatic Temperature Control (ATC) C1
harness connector.
Is the resistance below 10K ohms?
All
Yes
→ Repair the A/C Auxiliary Fan Relay High Side Control circuit for
a short to the Ground circuit.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 4
4
Turn the ignition off.
Remove the A/C Auxiliary Fan Relay from the relay center.
Disconnect the Automatic Temperature Control (ATC) C1 harness connector.
Measure the resistance between the A/C Auxiliary Fan Relay High Side Control
circuit and the Sensor Ground circuit in the Automatic Temperature Control (ATC)
C1 harness connector.
Is the resistance below 10K ohms?
All
Yes
→ Repair the A/C Auxiliary Fan Relay High Side 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.
143
HEATING & A/C
AUX FAN RELAY CONTROL SHORTED LOW (ACTIVE) —
Continued
Symptom:
BLOWER STAGE 1 HIGH OR OPEN (ACTIVE)
POSSIBLE CAUSES
BLOWER MOTOR
BLOWER MOTOR DRIVER CIRCUIT(S) SHORTED TO VOLTAGE
BLOWER MOTOR DRIVER CIRCUIT(S) OPEN
BLOWER MOTOR RESISTOR BLOCK
AUTOMATIC TEMPERATURE CONTROL (ATC)
TEST
ACTION
APPLICABILITY
1
Turn the ignition off.
NOTE: Check connectors - Clean/repair as necessary.
Disconnect the Blower Motor harness connector.
Connect a fused jumper wire between Battery (+) and Blower Motor cavity 1.
Connect a jumper wire between ground and Blower Motor cavity 2.
Does the Blower Motor run at full speed?
All
Yes
→ Go To 2
No
→ Replace the Blower Motor in accordance with the Service Infor-
mation.
Perform BODY VERIFICATION TEST - VER 1.
2
Turn the ignition off.
NOTE: Check connectors - Clean/repair as necessary.
Disconnect the Blower Motor Resistor Block harness connector.
Disconnect the Blower Motor harness connector.
Disconnect the Automatic Temperature Control (ATC) C2 harness connector.
Turn the ignition on.
Measure the voltage of each of the Blower Motor Driver circuits (Low, M1, M2, High).
Is the voltage above 0.2 volts on any of the circuits?
All
Yes
→ Repair each circuit with voltage above 0.2 volts 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 Automatic Temperature Control (ATC) C2 harness connector.
Disconnect the Blower Motor Resistor Block harness connector.
Disconnect the Blower Motor harness connector.
Measure the resistance of the Blower Motor Driver circuits (Low, M1, M2, High)
between the Automatic Temperature Control (ATC) C2 harness connector and the
Blower Motor Resistor Block harness connector.
Measure the resistance of the Blower Motor High Driver circuit between the
Automatic Temperature Control (ATC) C2 harness connector and the Blower Motor
harness connector.
Is the resistance below 5.0 ohms on each of the circuits?
All
Yes
→ Go To 4
No
→ Repair each circuit with a resistance above 5.0 ohms for an open.
Perform BODY VERIFICATION TEST - VER 1.
144
HEATING & A/C
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