Chrysler Town, Dodge Caravan. Manual — part 826
TEST
ACTION
APPLICABILITY
2
Turn the ignition off.
Disconnect the A/C - Heater Control Module C1 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 A/C - Heater Control Module in accordance with the
Service Information.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 3
3
Turn the ignition off.
Disconnect the A/C - Heater Control Module C1 harness connector.
Open the glove box door. Disconnect the glove box door roller latch from each side of
the glove box. Roll the glove box downward toward the floor.
Disconnect the in-line C202 harness connector.
Measure the resistance of the Evaporator Temperature Sensor Signal circuit between
the A/C - Heater Control Module C1 harness connector and the in-line C202 harness
connector.
Is the resistance below 5.0 ohms?
All
Yes
→ Go To 4
No
→ Repair the Evaporator Temperature Sensor Signal circuit be-
tween the A/C - Heater Control Module C1 harness connector and
the in-line C202 harness connector (HVAC side) for an open.
Perform BODY VERIFICATION TEST - VER 1.
540
HEATING & A/C
EVAPORATOR TEMPERATURE SENSOR CIRCUIT OPEN (ACTIVE) -
MTC —
Continued
TEST
ACTION
APPLICABILITY
4
Turn the ignition off.
Disconnect the A/C - Heater Control Module C1 harness connector.
Open the glove box door. Disconnect the glove box door roller latch from each side of
the glove box. Roll the glove box downward toward the floor.
Disconnect the in-line C202 harness connector.
Measure the resistance of the Sensor Ground circuit between the A/C - Heater
Control Module C1 harness connector and the in-line C202 harness connector.
Is the resistance below 5.0 ohms?
All
Yes
→ Check the wiring harness between the in-line C202 harness
connector (plenum side) and the Evaporator Temperature Sensor
for an open. Repair as necessary. If Ok, replace the Evaporator
Temperature Sensor in accordance with the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Repair the Sensor Ground circuit between the A/C - Heater
Control Module C1 harness connector and the in-line C202
harness connector (HVAC side) for an open.
Perform BODY VERIFICATION TEST - VER 1.
541
HEATING & A/C
EVAPORATOR TEMPERATURE SENSOR CIRCUIT OPEN (ACTIVE) -
MTC —
Continued
Symptom:
EVAPORATOR TEMPERATURE SENSOR CIRCUIT SHORT (AC-
TIVE) - MTC
When Monitored and Set Condition:
EVAPORATOR TEMPERATURE SENSOR CIRCUIT SHORT (ACTIVE) - MTC
When Monitored:
With the ignition on.
Set Condition:
This DTC will set if the A/C - Heater Control Module sees abnormally low
voltage on the Evaporator Temperature Sensor Signal circuit.
POSSIBLE CAUSES
EVAPORATOR TEMPERATURE SENSOR
EVAPORATOR TEMPERATURE SENSOR SIGNAL CIRCUIT SHORT TO GROUND
EVAPORATOR TEMPERATURE SENSOR SIGNAL CIRCUIT SHORT TO SENSOR GROUND CIR-
CUIT
A/C - HEATER CONTROL MODULE
TEST
ACTION
APPLICABILITY
1
Turn the ignition off.
Open the glove box door. Disconnect the glove box door roller latch from each side of
the glove box. Roll the glove box downward toward the floor.
Disconnect the in-line C202 harness connector.
Turn the ignition on.
With the DRBIII
t in Sensor Display, read the Evaporator Temperature Sensor
voltage.
Does the DRBIII
t display: 5.0 volts or greater?
All
Yes
→ Check the Evap Temp Sensor Signal circuit between the in-line
C202 harness connector (plenum side) and the Evap Temp Sensor
for a short to ground. Repair as necessary. If Ok, replace the
Evaporator Temperature Sensor in accordance with the Service
Info.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 2
542
HEATING & A/C
TEST
ACTION
APPLICABILITY
2
Turn the ignition off.
Disconnect the A/C - Heater Control Module C1 harness connector.
Open the glove box door. Disconnect the glove box door roller latch from each side of
the glove box. Roll the glove box downward toward the floor.
Disconnect the in-line C202 harness connector.
Measure the resistance between ground and the Evaporator Temperature Sensor
Signal circuit (HVAC side).
Is the resistance above 10K ohms?
All
Yes
→ Go To 3
No
→ Repair the Evaporator Temperature Sensor Signal circuit be-
tween the A/C - Heater Control Module C1 harness connector and
the in-line C202 harness connector (HVAC side) for a short to
ground.
Perform BODY VERIFICATION TEST - VER 1.
3
Turn the ignition off.
Disconnect the A/C - Heater Control Module C1 harness connector.
Open the glove box door. Disconnect the glove box door roller latch from each side of
the glove box. Roll the glove box downward toward the floor.
Disconnect the in-line C202 harness connector.
Measure the resistance between the Evaporator Temperature Sensor Signal circuit
and the Sensor Ground circuit (HVAC side).
Is the resistance above 10K ohms?
All
Yes
→ Replace the A/C - Heater Control Module in accordance with the
Service Information.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Repair the Evaporator Temperature Sensor Signal circuit be-
tween the A/C - Heater Control Module C1 harness connector and
the in-line C202 harness connector (HVAC side) for a short to
Sensor Ground.
Perform BODY VERIFICATION TEST - VER 1.
543
HEATING & A/C
EVAPORATOR TEMPERATURE SENSOR CIRCUIT SHORT (ACTIVE) -
MTC —
Continued
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