Chrysler Town and Country 2003 Owner's Manual page 1029

Verification Tests —
CABIN HEATER VERIFICATION TEST - VER 1
1. WARNING: DO NOT OPERATE THE DCHA IN AN ENCLOSED AREA SUCH AS A
GARAGE THAT DOES NOT HAVE EXHAUST VENTILATION FACILITIES. ALWAYS VENT
THE DCHA's EXHAUST WHEN OPERATING THE DCHA. FAILURE TO FOLLOW THESE
INSTRUCTIONS MAY RESULT IN PERSONAL INJURY OR DEATH.
2. WARNING: ALLOW THE DCHA ASSEMBLY TO COOL BEFORE PERFORMING A
COMPONENT INSPECTION/REPAIR/REPLACEMENT. FAILURE TO FOLLOW THESE
INSTRUCTIONS MAY RESULT IN PERSONAL INJURY.
3. NOTE: The DCHA Control will store up to three DTCs in its memory.
4. NOTE: If the DCHA Control detects a new fault in the DCHA system, one that is not
already stored in its memory, the DCHA Control will clear the oldest of the three stored
DTCs, and it will store the new fault's DTC.
5. NOTE: If the DCHA control detects a reoccurrence of a stored fault, the DCHA control
will overwrite that fault's DTC with the most recent occurrence.
6. Verify that the vehicle's battery is fully charged.
7. Verify that there is more than 1/8 of a tank of fuel in the vehicle's fuel tank. Add fuel, if necessary.
8. Verify that all DCHA coolant hoses and fuel lines are securely fastened to their respective
components.
9. Disconnect all jumper wires and reconnect all previously disconnected components and connectors.
10. If a heater installation/cooling system service was performed, purge the coolant circuit of air in
accordance with the Service Information.
11. Turn the ignition on.
12. On MTC, set the Blend control to the max cool position.
13. On ATC, set the Driver temperature control to LO (max cool).
14. Turn the ATC's or MTC's Power switch off.
15. Ensure that all accessories are turned off.
16. If a fuel system service requiring fuel to drain out of the DCHA fuel line was performed, prime
the DCHA Dosing Pump in accordance with the Service Information.
17. With the DRBIII , record and erase all DTCs from the Diesel Cabin Heater Assist (DCHA)
Control and the Front Control Module (FCM). Cycle the ignition off then on.
18. Start the engine.
19. Allow the engine to idle.
20. Turn the ATC's or MTC's Power switch on.
21. Turn the Blower control to the high speed position.
22. 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.
23. For MTC, perform Steps 24 through 29 and Steps 33 through 36 of this procedure. For ATC,
perform Steps 30 through 36 of this procedure.
24. CAUTION: For MTC, 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.
25. NOTE: For MTC, while performing the Diesel Cabin Heater Test, inspect the coolant
and fuel connections for leakage.
26. For MTC, with the DRBIII in HVAC, Systems Tests, select Diesel Cabin Heater Test and press
#1.
27. For MTC, set the Blend control to the max heat position. Allow the Diesel Cabin Heater Test to
run for five minutes. Upon completion of the test, proceed as follows:
28. For MTC, set the Blend control to the max cool position.
29. For MTC, press #2 on the DRBIII keyboard.
30. NOTE: For ATC, 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.
31. NOTE: For ATC, while performing the AC Cooldown Test, inspect the coolant and fuel
connections for leakage.
32. For ATC, with the DRBIII in ATC, Systems Tests, perform the A/C Cooldown Test. The DCHA
will operate for approximately 7 minutes. 3 minutes to run and 4 minutes to purge.
33. Turn the Blower control off.
34. Turn the ATC's or MTC's Power switch off.
35. Turn the ignition off, wait 5 seconds, then turn the ignition on.
36. Using the DRBIII , read the Cabin Heater and Active FCM DTCs.
Are any DTC's present or is the original condition still present?
Yes → Repair is not complete, refer to the appropriate symptom.
→ Repair is complete.
No
Continued
1005
VERIFICATION TESTS
APPLICABILITY
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