Chrysler Town, Dodge Caravan. Manual — part 771
TEST
ACTION
APPLICABILITY
3
WARNING: DO NOT OPERATE THE DCHA IN AN ENCLOSED AREA SUCH
AS A GARAGE THAT DOES NOT HAVE EXHAUST VENTILATION FACILI-
TIES. ALWAYS VENT THE DCHA’s EXHAUST WHEN OPERATING THE
DCHA. FAILURE TO FOLLOW THESE INSTRUCTIONS MAY RESULT IN
PERSONAL INJURY OR DEATH.
Turn the ignition on.
With the DRBIII
t, check for FCM and HVAC DTCs.
Does the DRBIII
t display any FCM or HVAC DTCs?
All
Yes
→ For FCM DTCs, return to the symptom list and choose the
symptom(s). Also, refer to Ignition, Power, Accessory category for
related symptom(s). For HVAC DTCs, refer to Heater & A/C for
related symptom(s).
Perform CABIN HEATER VERIFICATION TEST - VER 1.
No
→ Go To 4
4
WARNING: DO NOT OPERATE THE DCHA IN AN ENCLOSED AREA SUCH
AS A GARAGE THAT DOES NOT HAVE EXHAUST VENTILATION FACILI-
TIES. ALWAYS VENT THE DCHA’s EXHAUST WHEN OPERATING THE
DCHA. FAILURE TO FOLLOW THESE INSTRUCTIONS MAY RESULT IN
PERSONAL INJURY OR DEATH.
Start the engine.
Allow the engine to idle.
Turn the A/C - Heater Control Module’s Power switch on.
Turn the Blower control to the high speed position.
CAUTION: Do not activate the Diesel Cabin Heater Test with the engine off.
Failure to follow these instructions may result in internal damage to the
DCHA Heater Module.
NOTE: Do not disconnect the vehicle’s battery or the DCHA’s main power
supply while the DCHA is in operation or in run-down mode. Failure to
follow these instructions may result in excess emissions from the DCHA
during heater operation.
With the DRBIII
t in HVAC, Systems Tests, select Diesel Cabin Heater Test and press
#1.
With the DRBIII
t in HVAC, Systems Tests, Diesel Cabin Heater Test, read the Cabin
Heater Status.
Does the Status display: On?
All
Yes
→ Replace the FCM in accordance with the Service Information.
Perform CABIN HEATER VERIFICATION TEST - VER 1.
No
→ Replace the A/C - Heater Control Module in accordance with the
Service Information.
Perform CABIN HEATER VERIFICATION TEST - VER 1.
320
CABIN HEATER
*CABIN HEATER INOPERABLE FROM A/C - HEATER MODULE (MTC) —
Continued
Symptom:
*CABIN HEATER INOPERABLE FROM AUTO TEMP CONTROL
(ATC)
POSSIBLE CAUSES
DCHA ACTIVATION CRITERIA NOT MET
NO PCI BUS COMMUNICATION WITH FCM/ATC
FCM OR ATC DTCS PRESENT
FCM FAULT
AUTO TEMP CONTROL FAULT
TEST
ACTION
APPLICABILITY
1
WARNING: DO NOT OPERATE THE DCHA IN AN ENCLOSED AREA SUCH
AS A GARAGE THAT DOES NOT HAVE EXHAUST VENTILATION FACILI-
TIES. ALWAYS VENT THE DCHA’s EXHAUST WHEN OPERATING THE
DCHA. FAILURE TO FOLLOW THESE INSTRUCTIONS MAY RESULT IN
PERSONAL INJURY OR DEATH.
CAUTION: DO NOT PERFORM THIS TEST UNLESS DIRECTED HERE BY
THE CABIN HEATER PRE-TEST. ALWAYS PERFORM THE CABIN HEATER
PRE-TEST PRIOR TO PERFORMING ANY OTHER CABIN HEATER TEST
FOR THE RESULT TO BE VALID.
Verify that all of the following criteria was met during the attempt to activate the
DCHA from the Auto Temp Control.
The VIN indicates that the vehicle has a diesel engine.
The vehicle’s odometer read more than 5 miles.
The engine’s speed was above 500 rpm.
The engine’s coolant temperature was below 66°C (151°F).
The vehicle’s fuel tank had more than 1/8 of a tank of fuel.
The Auto Temp Control’s Power switch was on.
The Driver temperature control was set above 22°C (72°F).
Was all criteria met during the attempt to activate the DCHA from the Auto Temp
Control?
All
Yes
→ Go To 2
No
→ Attempt to activate the DCHA when all of the operating criteria
are met.
Perform CABIN HEATER VERIFICATION TEST - VER 1.
2
WARNING: DO NOT OPERATE THE DCHA IN AN ENCLOSED AREA SUCH
AS A GARAGE THAT DOES NOT HAVE EXHAUST VENTILATION FACILI-
TIES. ALWAYS VENT THE DCHA’s EXHAUST WHEN OPERATING THE
DCHA. FAILURE TO FOLLOW THESE INSTRUCTIONS MAY RESULT IN
PERSONAL INJURY OR DEATH.
Turn the ignition on.
With the DRBIII
t, attempt to communicate with the FCM and the ATC.
Was the DRBIII
t able to communicate with the FCM and the ATC?
All
Yes
→ Go To 3
No
→ Refer to Communication for the related symptom(s)
Perform CABIN HEATER VERIFICATION TEST - VER 1.
321
CABIN HEATER
TEST
ACTION
APPLICABILITY
3
WARNING: DO NOT OPERATE THE DCHA IN AN ENCLOSED AREA SUCH
AS A GARAGE THAT DOES NOT HAVE EXHAUST VENTILATION FACILI-
TIES. ALWAYS VENT THE DCHA’s EXHAUST WHEN OPERATING THE
DCHA. FAILURE TO FOLLOW THESE INSTRUCTIONS MAY RESULT IN
PERSONAL INJURY OR DEATH.
Turn the ignition on.
With the DRBIII
t, check for FCM and ATC DTCs.
Does the DRBIII
t display any FCM or ATC DTCs?
All
Yes
→ For FCM DTCs, return to the symptom list and choose the
symptom(s). Also, refer to Ignition, Power, Accessory category for
related symptom(s). For ATC DTCs, refer to Automatic Tempera-
ture Control for related symptom(s).
Perform CABIN HEATER VERIFICATION TEST - VER 1.
No
→ Go To 4
322
CABIN HEATER
*CABIN HEATER INOPERABLE FROM AUTO TEMP CONTROL (ATC) —
Continued
TEST
ACTION
APPLICABILITY
4
WARNING: DO NOT OPERATE THE DCHA IN AN ENCLOSED AREA SUCH
AS A GARAGE THAT DOES NOT HAVE EXHAUST VENTILATION FACILI-
TIES. ALWAYS VENT THE DCHA’s EXHAUST WHEN OPERATING THE
DCHA. FAILURE TO FOLLOW THESE INSTRUCTIONS MAY RESULT IN
PERSONAL INJURY OR DEATH.
NOTE: The AC Cooldown Test is actuated with the DRBIII
t. The test checks
A/C system performance based on evaporator temperature sensor input. It
also forces the ATC to initiate a Cabin Heater Activation request when the
vehicle is equipped with a DCHA.
NOTE: The A/C related portion of this test will not run if ambient temp is
below 12°C (53°F). However, the forced Cabin Heater activation will occur
even if the A/C portion of this test fails to initiate because test criteria was
not met.
NOTE: The A/C related portion of this test will pass if evap temp drops 6.7°C
(20°F) within 2 minutes of starting this test.
NOTE: Only A/C related messages display on the DRBIII
t after running this
test. These messages will clear after paging back out of this test. Therefore,
it is important to note all of the test messages before doing so.
NOTE: Running this test will cause the DELAY & Snowflake VF segments on
the ATC to flash for 162 seconds. If the A/C related portion of this test fails,
the DELAY & Snowflake VF segments will continue to flash until the vehicle
is driven more than 3 miles.
Start the engine.
Press the ATC’s Power switch on.
Turn the Front Blower control to the high speed position.
CAUTION: Do not activate the A/C Cooldown Test with the engine off.
Failure to follow these instructions may result in internal damage to the
DCHA Heater Module.
NOTE: Do not disconnect the vehicle’s battery or the DCHA’s main power
supply while the DCHA is in operation or in run-down mode. Failure to
follow these instructions may result in excess emissions from the DCHA
during heater operation.
NOTE: Before actuating the AC Cooldown Test, verify that the A/C compres-
sor is not running, If the compressor is running, turn the A/C off and allow
the evaporator to warm up before proceeding with the test.
NOTE: The DCHA will operate for approximately 7 minutes. 3 minutes to
run and 4 minutes to purge.
With the DRBIII
t in ATC, Systems Tests, perform the AC Cooldown Test. Then,
select Page Back, Page Back, Monitor Display, and PCI Bus Info ATC.
View the
9RG DCHA Req9 monitor.
Does the Rg DCHA Req monitor display ON?
All
Yes
→ Replace the FCM in accordance with the Service Information.
Perform CABIN HEATER VERIFICATION TEST - VER 1.
No
→ Replace the Auto Temp Control in accordance with the Service
Information.
Perform CABIN HEATER VERIFICATION TEST - VER 1.
323
CABIN HEATER
*CABIN HEATER INOPERABLE FROM AUTO TEMP CONTROL (ATC) —
Continued
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