Chrysler Pacifica. Manual — part 153
TEST
ACTION
APPLICABILITY
7
Turn the ignition off.
Disconnect the ATC C2 harness connector.
Disconnect the Rear Booster Fan Rear Control Switch harness connector.
Measure the resistance of the Rear Fan Sense Return circuit between the ATC C2
harness connector and the Rear Booster Fan Rear Control Switch harness connector.
Is the resistance below 5.0 ohms?
All
Yes
→ Go To 8
No
→ Repair the Rear Fan Sense Return circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
8
Turn the ignition off.
Reconnect all previously disconnected components.
Connect DRBIII
t X10 Scope Probe CH7061 to the DRBIIIt.
Select the following from the DRBIII
t menu: PEP Module Tools; Lab Scope; Live
Data; and Lab Scope.
Select the following Lab Scope settings:
Set the time to 10ms/Div.
Set the voltage range to +10.0v.
Set the Offset to 2.00v.
Set the Probe to X10.
Start the engine.
Press the ATC’s PWR switch on.
Press the REAR fan mode switch on, so that it is in manual mode. The word
9REAR9
should display on the ATC display panel. The word
9AUTO9 should not be displayed.
Turn the Rear Booster Fan Rear Control Switch to the AUTO position.
Using the X10 Scope Probe, back probe the Rear Fan Sense circuit in the Rear
Booster Fan Rear Control Switch harness connector.
Slowly turn the Rear Booster Fan Rear Control through each of the 12 switch
positions (Auto, Off, & Spds 1 - 10) while observing the DRBIII
t display. The voltage
should increase gradually from approx. 0.06 to 4.9 volts with no spikes or signal drop
out.
Was any loss of signal observed while rotating the switch?
All
Yes
→ Replace the Rear Booster Fan Rear Control Switch in accordance
with the Service Information.
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.
609
HEATING & A/C
REAR FAN POT OPEN (ACTIVE) - ATC —
Continued
Symptom:
REAR FAN POT SHORTED (ACTIVE) - ATC
When Monitored and Set Condition:
REAR FAN POT SHORTED (ACTIVE) - ATC
When Monitored:
With the ignition on and the IOD fuse installed.
Set Condition:
This DTC will set if the Rear Fan Sense input is below 3 A/D counts (0.059
volts).
POSSIBLE CAUSES
REAR FAN SENSE SUPPLY CIRCUIT SHORTED TO GROUND
REAR FAN SENSE SUPPLY CIRCUIT SHORTED TO REAR FAN SENSE RETURN CIRCUIT
REAR FAN SENSE SUPPLY CIRCUIT OPEN
REAR FAN SENSE CIRCUIT SHORTED TO GROUND
REAR FAN SENSE CIRCUIT SHORTED TO REAR FAN SENSE RETURN CIRCUIT
REAR BOOSTER FAN REAR CONTROL SWITCH
AUTOMATIC TEMPERATURE CONTROL (ATC)
TEST
ACTION
APPLICABILITY
1
Turn the ignition off.
Disconnect the ATC C1 harness connector.
Disconnect the Rear Booster Fan Rear Control Switch harness connector.
Measure the resistance between ground and the Rear Fan Sense Supply circuit.
Is the resistance above 100K ohms?
All
Yes
→ Go To 2
No
→ Repair the Rear Fan Sense Supply circuit for a short to ground.
Perform BODY VERIFICATION TEST - VER 1.
2
Turn the ignition off.
Disconnect the ATC C1 harness connector.
Disconnect the ATC C2 harness connector.
Disconnect the Rear Booster Fan Rear Control Switch harness connector.
Measure the resistance between the Rear Fan Sense Supply circuit and the Rear Fan
Sense Return circuit.
Is the resistance above 100K ohms?
All
Yes
→ Go To 3
No
→ Repair the Rear Fan Sense Supply circuit for a short to the Rear
Fan Sense Return circuit.
Perform BODY VERIFICATION TEST - VER 1.
610
HEATING & A/C
TEST
ACTION
APPLICABILITY
3
Turn the ignition off.
Disconnect the ATC C1 harness connector.
Disconnect the Rear Booster Fan Rear Control Switch harness connector.
Measure the resistance of the Rear Fan Sense Supply circuit between the ATC C1
harness connector and the Rear Booster Fan Rear Control Switch harness connector.
Is the resistance below 5.0 ohms?
All
Yes
→ Go To 4
No
→ Repair the Rear Fan Sense Supply circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
4
Turn the ignition off.
Disconnect the ATC C1 harness connector.
Disconnect the Rear Booster Fan Rear Control Switch harness connector.
Measure the resistance between ground and the Rear Fan Sense circuit.
Is the resistance above 100K ohms?
All
Yes
→ Go To 5
No
→ Repair the Rear Fan Sense circuit for a short to ground.
Perform BODY VERIFICATION TEST - VER 1.
5
Turn the ignition off.
Disconnect the ATC C1 harness connector.
Disconnect the ATC C2 harness connector.
Disconnect the Rear Booster Fan Rear Control Switch harness connector.
Measure the resistance between the Rear Fan Sense circuit and the Rear Fan Sense
Return circuit.
Is the resistance above 100K ohms?
All
Yes
→ Go To 6
No
→ Repair the Rear Fan Sense circuit for a short to the Rear Fan
Sense Return circuit.
Perform BODY VERIFICATION TEST - VER 1.
6
Turn the ignition off.
Reconnect the ATC C1 & C2 harness connectors.
Disconnect the Rear Booster Fan Rear Control Switch harness connector.
Turn the ignition on.
With the DRBIII
t, read active ATC DTCs.
Does the DRBIII
t display: Rear Fan Pot Shorted?
All
Yes
→ Replace the Automatic Temperature Control (ATC) in accordance
with the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Replace the Rear Booster Fan Rear Control Switch in accordance
with the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
611
HEATING & A/C
REAR FAN POT SHORTED (ACTIVE) - ATC —
Continued
Symptom:
RECIRC DOOR TRAVEL TOO SMALL (ACTIVE) - ATC
When Monitored and Set Condition:
RECIRC DOOR TRAVEL TOO SMALL (ACTIVE) - ATC
When Monitored:
With the ignition on and IOD fuse installed.
Set Condition:
The Automatic Temperature Control (ATC) monitors the door’s range of
travel during system initialization. If the measured range is less than expected, the DTC
will set.
POSSIBLE CAUSES
RECIRC DOOR NOT RESPONDING DTC SET
AUTOMATIC TEMPERATURE CONTROL (ATC)
OBSTRUCTED RECIRC DOOR
RECIRCULATION DOOR ACTUATOR
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, read the active ATC DTCs.
Does the DRBIII
t display: RECIRC DOOR NOT RESPONDING?
All
Yes
→ Return to the Heating & A/C symptom list and choose the
symptom.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 2
2
Turn the ignition off.
Disconnect the Recirculation Door Actuator harness connector.
Connect a 12-volt Test Light between the Recirculation Door Actuator harness
connector cavities.
Turn the ignition on.
While monitoring the test light, press the RECIRC mode switch from off to on.
NOTE: Observe test light for approximately 30 seconds.
Does the test light start to flash and stay flashing?
All
Yes
→ Go To 3
No
→ Replace the Automatic Temperature Control (ATC) in accordance
with the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
612
HEATING & A/C
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