Chrysler Town, Dodge Caravan. Manual — part 751
Symptom List:
PCI BUS SHORTED HIGH (ACTIVE)
PCI BUS SHORTED LOW (ACTIVE)
Test Note:
All symptoms listed above are diagnosed using the same tests.
The title for the tests will be PCI BUS SHORTED HIGH
(ACTIVE).
When Monitored and Set Condition:
PCI BUS SHORTED HIGH (ACTIVE)
When Monitored:
With the ignition on.
Set Condition:
This DTC is set if the ATC detects a short to voltage on the PCI Bus circuit.
PCI BUS SHORTED LOW (ACTIVE)
When Monitored:
With the ignition on.
Set Condition:
This DTC is set if the ATC detects a short to ground on the PCI Bus circuit.
POSSIBLE CAUSES
DTC CONDITION
TEST
ACTION
APPLICABILITY
1
NOTE: For this code to be active, the DRB will not be able to communicate
with any modules on the vehicle (except the PCM/ECM).
NOTE: If this code is set and active it will be necessary to replace the
Automatic Temperature Control Module for displaying a false DTC.
NOTE: If this code is NOT active do not perform this test.
If there are no possible causes remaining, view repair.
All
Repair
Replace the ATC.
With the DRBIII
t, reset the ATC after repair is complete.
Perform BODY VERIFICATION TEST - VER 1.
240
AUTOMATIC TEMPERATURE CONTROL
Symptom:
REAR BLEND DOOR NOT RESPONDING (ACTIVE)
When Monitored and Set Condition:
REAR BLEND DOOR NOT RESPONDING (ACTIVE)
When Monitored:
With the ignition on and the IOD fuse installed.
Set Condition:
This DTC is set if the ATC does not receive feedback pulses within 5
seconds of the drive voltage being applied.
POSSIBLE CAUSES
REAR BLEND DOOR DRIVER CIRCUIT (A) SHORTED TO GROUND
REAR BLEND DOOR DRIVER CIRCUIT (B) SHORTED TO GROUND
REAR BLEND DOOR DRIVER CIRCUITS (A) AND (B) SHORTED TOGETHER
REAR BLEND DOOR DRIVER CIRCUIT (A) OPEN
REAR BLEND DOOR DRIVER CIRCUIT (B) OPEN
ATC
REAR BLEND DOOR ACTUATOR
TEST
ACTION
APPLICABILITY
1
Turn the ignition off.
Disconnect the Rear Blend Door Actuator harness connector.
Disconnect the ATC C1 harness connector.
Measure the resistance between ground and the Rear Blend Door Driver (A) circuit.
Is the resistance above 100k ohms?
All
Yes
→ Go To 2
No
→ Repair the Rear Blend Door Driver (A) circuit for a short to
ground.
With the DRBIII
t, reset the ATC after repair is complete.
Perform BODY VERIFICATION TEST - VER 1.
2
Turn the ignition off.
Disconnect the Rear Blend Door Actuator harness connector.
Disconnect the ATC C1 harness connector.
Measure the resistance between ground and the Rear Blend Door Driver (B) circuit.
Is the resistance above 100k ohms?
All
Yes
→ Go To 3
No
→ Repair the Rear Blend Door Driver (B) circuit for a short to
ground.
With the DRBIII
t, reset the ATC after repair is complete.
Perform BODY VERIFICATION TEST - VER 1.
241
AUTOMATIC TEMPERATURE CONTROL
TEST
ACTION
APPLICABILITY
3
Turn the ignition off.
Disconnect the Rear Blend Door Actuator harness connector.
Disconnect the ATC C1 harness connectors.
Measure the resistance between the Rear Blend Door Driver (A) and (B) circuits.
Is the resistance above 100k ohms?
All
Yes
→ Go To 4
No
→ Repair the Rear Blend Door Driver (A) and (B) circuits for a short
together.
With the DRBIII
t, reset the ATC after repair is complete.
Perform BODY VERIFICATION TEST - VER 1.
4
Turn the ignition off.
Disconnect the Rear Blend Door Actuator harness connector.
Disconnect the ATC C1 harness connector.
Measure the resistance of the Rear Blend Door Driver (A) circuit.
Is the resistance below 5.0 ohms?
All
Yes
→ Go To 5
No
→ Repair the Rear Blend Door Driver (A) circuit for an open.
With the DRBIII
t, reset the ATC after repair is complete.
Perform BODY VERIFICATION TEST - VER 1.
5
Turn the ignition off.
Disconnect the Rear Blend Door Actuator harness connector.
Disconnect the ATC C1 harness connector.
Measure the resistance of the Rear Blend Door Driver (B) circuit.
Is the resistance below 5.0 ohms?
All
Yes
→ Go To 6
No
→ Repair the Rear Blend Door Driver (B) circuit for an open.
With the DRBIII
t, reset the ATC after repair is complete.
Perform BODY VERIFICATION TEST - VER 1.
6
Turn the ignition off.
Disconnect the ATC C1 harness connector.
Measure the resistance between the Rear Blend Door Driver (A) and (B) circuits.
Is the resistance between 26.0 and 46.0 ohms?
All
Yes
→ Replace the ATC.
With the DRBIII
t, reset the ATC after repair is complete.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 7
7
If there are no possible causes remaining, view repair.
All
Repair
Replace the Rear Blend Door Actuator.
With the DRBIII
t, reset the ATC after repair is complete.
Perform BODY VERIFICATION TEST - VER 1.
242
AUTOMATIC TEMPERATURE CONTROL
REAR BLEND DOOR NOT RESPONDING (ACTIVE) —
Continued
Symptom:
REAR BLEND DOOR TRAVEL TOO LARGE (ACTIVE)
When Monitored and Set Condition:
REAR BLEND DOOR TRAVEL TOO LARGE (ACTIVE)
When Monitored:
With the ignition on and the IOD fuse installed.
Set Condition:
This DTC is set when the ATC monitors the travel range during system
initialization and the measured range is greater than expected.
POSSIBLE CAUSES
CHECK THE ATC FOR DTCS
REAR BLEND DOOR ACTUATOR
REAR BLEND DOOR LINKAGE
ATC
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRB, read the active ATC DTC’s.
Is the REAR BLEND DOOR NOT RESPONDING DTC set?
All
Yes
→ Return to the symptom list and choose the symptom.
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.
Remove the Rear Blend Door Actuator.
By hand, attempt to rotate the Rear Blend Door Actuator in both directions.
Did the blend door actuator turn in either direction?
All
Yes
→ Replace the Rear Blend Door Actuator.
With the DRBIII
t, reset the ATC after repair is complete.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 3
3
Remove the Rear Blend Door Actuator. Rotate the blend door (door only). Note: This
should rotate approximately 45 degrees from stop to stop.
Inspect the blend door linkage for excessive wear or missing linkage.
Were any mechanical problems found?
All
Yes
→ Repair or replace the rear blend door/linkage as necessary.
With the DRBIII
t, reset the ATC after repair is complete.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Replace the ATC.
With the DRBIII
t, reset the ATC after repair is complete.
Perform BODY VERIFICATION TEST - VER 1.
243
AUTOMATIC TEMPERATURE CONTROL
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