Chrysler Town, Dodge Caravan. Manual — part 563
TEST
ACTION
APPLICABILITY
8
Turn the ignition on.
With the DRBIII
t, monitor the TP Sensor voltage.
Slowly open the throttle from the idle position to the wide open throttle position.
Does voltage start at approximately 0.8 of a volt and go above 3.5 volts with a smooth
transition?
All
Yes
→ Repair as necessary
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→ Replace the Throttle Position Sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
60
DRIVEABILITY - SBEC
P0123-THROTTLE POSITION SENSOR VOLTAGE HIGH —
Continued
Symptom:
P0125-CLOSED LOOP TEMP NOT REACHED
When Monitored and Set Condition:
P0125-CLOSED LOOP TEMP NOT REACHED
When Monitored:
With battery voltage greater than 10.4 volts, after engine is started.
Set Condition:
The engine temperature does not go above 15°C (60°F). Failure time
depends on start-up coolant temperature and ambient temperature. (i.e. 2 minutes for a
start temp of 10°C (50°F) or up to 10 mintues for a vehicle with a start-up temp of -28°C
(20°F). Two trips are required to set this DTC.
POSSIBLE CAUSES
LOW COOLANT LEVEL
THERMOSTAT OPERATION
ENGINE COOLANT TEMPERATURE SENSOR
TEST
ACTION
APPLICABILITY
1
NOTE: If a Engine Coolant Temperature (ECT) DTC is set along with this
code, diagnose the ECT DTC first.
NOTE: Inspect the ECT terminals and related PCM terminals. Ensure the
terminals are free from corrosion and damage.
NOTE: The best way to diagnose this DTC is to allow the vehicle to sit
overnight outside in order to have a totally cold soaked engine.
Note: Extremely cold outside ambient temperatures may have caused this
DTC to set.
WARNING: Never open the cooling system when the engine is hot. The
system is under pressure. Extreme burns or scalding may result. Allow the
engine to cool before opening the cooling system.
Check the coolant system to make sure that the coolant is in good condition and at
the proper level.
Is the coolant level and condition OK?
All
Yes
→ Go To 2
No
→ Inspect the vehicle for a coolant leak and add the necessary
amount of coolant.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
61
DRIVEABILITY - SBEC
TEST
ACTION
APPLICABILITY
2
Note: This test works best if performed on a cold engine (cold soak)
Turn the ignition on.
With the DRBIII
t, read the Eng Coolant Tmp Deg value. If the engine was allowed
to sit overnight (cold soak), the temperature value should be a sensible value that is
somewhere close to the ambient temperature.
Note: If engine coolant temperature is above 82°C (180°F), allow the engine
to cool until 65°C (150°F) is reached.
Start the Engine.
Using the appropriate service information, determine the proper opening tempera-
ture of the thermostat.
Did the thermostat open at the proper temperature?
All
Yes
→ Go To 3
No
→ Replace the thermostat.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
3
Turn the ignition on.
With the DRBIII
t, read the Eng Coolant Tmp Deg value. If the engine was allowed
to sit overnight (cold soak), the temperature value should be a sensible value that is
somewhere close to the ambient temperature.
Note: If engine coolant temperature is above 82°C (180°F), allow the engine
to cool until 65°C (150°F) is reached.
Start the Engine.
During engine warm-up monitor the Eng Coolant Tmp Deg value. The temp deg
value change should be a smooth transition from start up to normal operating temp
82°C (180°F) . Also monitor the actual coolant temperature with a thermometer.
NOTE: As the engine warms up to operating temperature, the actual coolant
temperature (thermometer reading) and the Eng Coolant Tmp Deg in the
DRB values should stay relatively close to each other.
Does the actual coolant temperature and the reading on the DRBIII
t remain
relatively the same with a
All
Yes
→ Test Complete.
No
→ Replace the Engine Coolant Temperature Sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
62
DRIVEABILITY - SBEC
P0125-CLOSED LOOP TEMP NOT REACHED —
Continued
Symptom List:
P0131-1/1 O2 SENSOR SHORTED TO GROUND
P0137-1/2 O2 SENSOR SHORTED TO GROUND
Test Note:
All symptoms listed above are diagnosed using the same tests.
The title for the tests will be P0131-1/1 O2 SENSOR SHORTED
TO GROUND.
When Monitored and Set Condition:
P0131-1/1 O2 SENSOR SHORTED TO GROUND
When Monitored:
At engine shutdown O2 Heater Diagnostics test. Then at subsequent
cold start. Cold start is defined as engine coolant below 37°C (100°F), ambient/battery
sensor reading within 6.6°C (44°F), and engine coolant temperature above 63°C (146°F) on
the previous key off.
Set Condition:
The oxygen sensor signal voltage is below 0.078 volts for 5 seconds after
starting engine.
P0137-1/2 O2 SENSOR SHORTED TO GROUND
When Monitored:
Engine running for 119 seconds. Coolant temperature above 80°C
(176°F). Vehicle speed greater than 40 mph. Two trip fault.
Set Condition:
The oxygen sensor signal voltage is below 0.078 volts for 61 seconds after
starting engine.
POSSIBLE CAUSES
O2 SENSOR BELOW 0.08 VOLTS
O2 SENSOR OPERATION
O2 SENSOR SIGNAL CIRCUIT SHORTED TO GROUND
O2 SENSOR SIGNAL CIRCUIT SHORTED TO SENSOR GROUND CIRCUIT
O2 SENSOR SIGNAL SHORTED TO HEATER CONTROL/GROUND CIRCUIT
PCM
TEST
ACTION
APPLICABILITY
1
Start the engine.
Allow the engine to reach normal operating temperature.
With the DRBIII
t, read the O2 Sensor voltage.
Is the voltage below 0.08?
All
Yes
→ Go To 2
No
→ Refer to the INTERMITTENT CONDITION symptom in the
Driveability category.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
63
DRIVEABILITY - SBEC
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