Chrysler Town, Dodge Caravan. Manual — part 744
TEST
ACTION
APPLICABILITY
3
Remove the Driver Blend Door Actuator. Rotate the blend door (door only). Note: This
should rotate approximately 45 degrees from stop to stop.
Does the blend door move smoothly in both directions?
All
Yes
→ Replace the Driver Blend Door Actuator.
With the DRBIII
t, reset the ATC after repair is complete.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Repair or replace the driver blend door as necessary.
With the DRBIII
t, reset the ATC after repair is complete.
Perform BODY VERIFICATION TEST - VER 1.
212
AUTOMATIC TEMPERATURE CONTROL
DRIVER BLEND DOOR TRAVEL TOO SMALL (ACTIVE) —
Continued
Symptom:
EEPROM CHECKSUM ERROR (ACTIVE)
When Monitored and Set Condition:
EEPROM CHECKSUM ERROR (ACTIVE)
When Monitored:
Ignition in RUN and IOD fuse installed after a battery disconnect.
Set Condition:
This DTC is set if the calculated check sum does not match the stored
value.
POSSIBLE CAUSES
ATC - EEPROM CHECKSUM ERROR
TEST
ACTION
APPLICABILITY
1
When this code is present, the ATC must be replaced.
View repair.
All
Repair
Replace the ATC.
With the DRBIII
t, reset the ATC after repair is complete.
Perform BODY VERIFICATION TEST - VER 1.
213
AUTOMATIC TEMPERATURE CONTROL
Symptom:
EVAP TEMP SENSOR OPEN (ACTIVE)
When Monitored and Set Condition:
EVAP TEMP SENSOR OPEN (ACTIVE)
When Monitored:
With the ignition on and the IOD fuse installed. Also, during the
Cooldown Test.
Set Condition:
This DTC is displayed if the ATC detects an abnormally high voltage on
the evaporator temperature sensor signal. Evap Temp Sensor Open is also displayed as a
Cooldown Test Message if the ATC detects an abnormally high voltage on the evaporator
temperature sensor signal during the Cooldown Test.
POSSIBLE CAUSES
EVAPORATOR TEMPERATURE SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE
EVAPORATOR TEMP SENSOR SIGNAL CKT SHORTED TO BLOWER MOTOR CONTROL CKT
EVAP TEMP SENSOR SIGNAL CKT SHORTED TO REAR BLOWER MOTOR CONTROL CKT
ATC
EVAPORATOR TEMPERATURE SENSOR SIGNAL CIRCUIT OPEN
SENSOR GROUND CIRCUIT OPEN
EVAPORATOR TEMPERATURE SENSOR
TEST
ACTION
APPLICABILITY
1
Turn the ignition off.
Disconnect the ATC C2 harness connector.
Turn the ignition on.
Measure the voltage of the Evaporator Temperature Sensor Signal circuit.
Is there any voltage present?
All
Yes
→ Repair the Evaporator Temperature Sensor Signal circuit for a
short to voltage.
With the DRBIII
t, reset the ATC after repair is complete.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 2
2
Turn the ignition off.
Disconnect the ATC C2 harness connector.
Measure the resistance between the Evaporator Temperature Sensor Signal circuit
and the Blower Motor Control circuit.
Is the resistance below 10K ohms?
All
Yes
→ Repair the Evaporator Temperature Sensor Signal circuit for a
short to the Blower Motor Control circuit.
With the DRBIII
t, reset the ATC after repair is complete.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 3
214
AUTOMATIC TEMPERATURE CONTROL
TEST
ACTION
APPLICABILITY
3
Turn the ignition off.
Disconnect the ATC C2 harness connector.
Measure the resistance between the Evaporator Temperature Sensor Signal circuit
and the Rear Blower Motor Control circuit.
Is the resistance below 10K ohms?
All
Yes
→ Repair the Evaporator Temperature Sensor Signal circuit for a
short to the Rear Blower Motor Control circuit.
With the DRBIII
t, reset the ATC after repair is complete.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 4
4
Turn the ignition off.
Disconnect the ATC C2 harness connector.
Measure the resistance between the Evaporator Temperature Sensor Signal circuit
and the Sensor Ground circuit. The approximate circuit resistance should be:
5,900 ohms @ 38°C (100°F).
6,600 ohms @ 35°C (95°F).
7,400 ohms @ 32°C (90°F).
8,300 ohms @ 29°C (85°F).
9,400 ohms @ 27°C (80°F).
10,600 ohms @ 24°C (75°F).
11,900 ohms @ 21°C (70°F).
13,500 ohms @ 18°C (65°F).
15,300 ohms @ 16°C (60°F).
17,500 ohms @ 13°C (55°F).
19,900 ohms @ 10°C (50°F).
22,800 ohms @ 7°C (45°F).
26,100 ohms @ 4°C (40°F).
30,000 ohms @ 2°C (35°F).
34,600 ohms @ -1°C (30°F).
Is the resistance within the specifications?
All
Yes
→ Replace the ATC in accordance with the Service Information.
With the DRBIII
t, reset the ATC after repair is complete.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 5
5
Turn the ignition off.
Disconnect the ATC C2 harness connector.
Disconnect the in-line C202 harness connector.
Measure the resistance of the Evaporator Temperature Sensor Signal circuit between
the ATC C2 harness connector and the in-line C202 harness connector.
Is the resistance below 5.0 ohms?
All
Yes
→ Go To 6
No
→ Repair the Evaporator Temperature Sensor Signal circuit be-
tween the ATC C2 harness connector and the in-line C202
harness connector (HVAC side) for an open.
With the DRBIII
t, reset the ATC after repair is complete.
Perform BODY VERIFICATION TEST - VER 1.
215
AUTOMATIC TEMPERATURE CONTROL
EVAP TEMP SENSOR OPEN (ACTIVE) —
Continued
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