Chrysler PT Cruiser. Manual — part 305
TEST
ACTION
APPLICABILITY
5
WARNING: MAKE SURE THE ENGINE COOLING SYSTEM IS COOL BE-
FORE REMOVING THE PRESSURE CAP OR ANY HOSE. SEVERE PER-
SONAL INJURY MAY RESULT FROM ESCAPING HOT COOLANT. THE
COOLING SYSTEM IS PRESSURIZED WHEN HOT.
Turn the ignition on.
With the DRBIII
t, read and record the ECT Sensor Temperature value
Using the DRB Temperature Probe #CH7050, measure the engine coolant tempera-
ture.
Is the ECT Sensor value with 5°C (9°F) of the temperature probe reading?
All
Yes
→ Go To 6
No
→ Go To 7
6
Inspect the Temperature sensors for any physical damage.
Inspect the engine coolant. Ensure the coolant is at the proper level. Refer to the
Service Information COOLING.
Ensure the Temperature sensors are properly mounted.
Ensure the CMP and CKP sensors are mounted properly. Check the connectors for
any signs of damage.
WARNING: WHEN THE ENGINE IS OPERATING, DO NOT STAND IN A
DIRECT LINE WITH THE FAN. DO NOT PUT YOUR HANDS NEAR THE
PULLEYS, BELTS OR FAN. DO NOT WEAR LOOSE CLOTHING.
Refer to any Technical Service Bulletins (TSBs) that may apply.
With the engine running at normal operating temperature, monitor the Temperature
sensor parameters while wiggling the wire harness. Look for parameter values to
change.
Visually inspect the related wire harness. Look for any chafed, pierced, pinched,
partially broken wires and broken, bent, pushed out, or corroded terminals.
CAUTION: NEVER PROBE THE PCM HARNESS CONNECTORS. PROBING
THE PCM HARNESS CONNECTORS WILL DAMAGE THE PCM TERMI-
NALS RESULTING IN POOR TERMINAL TO PIN CONNECTION. INSTALL
MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS.
Inspect and clean all PCM, engine, and chassis grounds.
Were any problems found during the above inspections?
All
Yes
→ Repair as necessary
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→ Test Complete.
7
NOTE: Visually inspect both the component and the PCM connectors. Look
for damage, partially broken wires and backed out or corroded terminals
Turn the ignition off.
Disconnect the applicable Temperature Sensor harness connector.
Ignition on, engine not running.
Measure the voltage of the Signal circuit in the applicable Temperature Sensor
harness connector.
Is the voltage above 5.2 volts?
All
Yes
→ Repair the short to battery voltage in the Signal circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→ Go To 8
310
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P0128-THERMOSTAT RATIONALITY —
Continued
TEST
ACTION
APPLICABILITY
8
Turn the ignition off.
Disconnect the applicable Temperature Sensor harness connector.
Ignition on, engine not running.
With the DRBIII
t, read the Temperature Sensor voltage.
Is the voltage above 4.9 volts?
All
Yes
→ Go To 9
No
→ Go To 12
9
Turn the ignition off.
Disconnect the applicable Temperature Sensor harness connector.
Using a jumper wire, jumper across the Temperature Sensor harness connector.
Ignition on, engine not running.
With the DRBIII
t, read the Temperature voltage.
Is the voltage below 0.1 volt?
All
Yes
→ Replace the applicable Temperature Sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→ Go To 10
10
Turn the ignition off.
Disconnect the applicable Temperature Sensor harness connector.
Disconnect the PCM harness connector.
CAUTION: DO NOT PROBE THE PCM HARNESS CONNECTORS. PROBING
THE PCM HARNESS CONNECTORS WILL DAMAGE THE PCM TERMI-
NALS RESULTING IN POOR TERMINAL TO PIN CONNECTION. INSTALL
MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS.
Measure the resistance of the Signal circuit from the Temperature Sensor harness
connector to the appropriate terminal of special tool #8815.
Is the resistance below 5.0 ohms?
All
Yes
→ Go To 11
No
→ Repair the open in the Signal circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
11
Turn the ignition off.
Disconnect the applicable Temperature Sensor harness connector.
Disconnect the PCM harness connector.
CAUTION: DO NOT PROBE THE PCM HARNESS CONNECTORS. PROBING
THE PCM HARNESS CONNECTORS WILL DAMAGE THE PCM TERMI-
NALS RESULTING IN POOR TERMINAL TO PIN CONNECTION. INSTALL
MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS.
Measure the resistance of the Sensor ground circuit from the Ambient Air Temper-
ature Sensor harness connector to the appropriate terminal of special tool #8815.
Is the resistance below 5.0 ohms?
All
Yes
→ NOTE: Before continuing, check the PCM harness connector
terminals for corrosion, damage, or terminal push out. Repair as
necessary. Replace and program the Powertrain Control Module
in accordance with the Service Information.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→ Repair the open in the Sensor ground circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
311
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P0128-THERMOSTAT RATIONALITY —
Continued
TEST
ACTION
APPLICABILITY
12
Turn the ignition off.
Disconnect the applicable Temperature Sensor harness connector.
Disconnect the PCM harness connector.
Measure the resistance between ground and the Signal circuit in the Temperature
harness connector.
Is the resistance below 100 ohms?
All
Yes
→ Repair the short to ground in the Signal circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→ Go To 13
13
Turn the ignition off.
Disconnect the applicable Temperature Sensor harness connector.
Disconnect the PCM harness connector.
Measure the resistance between the Signal circuit and the Sensor ground circuit in
the Temperature Sensor harness connector.
Is the resistance below 100 ohms?
All
Yes
→ Repair the Sensor ground shorted to the Signal circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→ NOTE: Before continuing, check the PCM harness connector
terminals for corrosion, damage or terminal push out. Repair as
necessary. Replace and program the Powertrain Control Module
in accordance with the Service Information.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
312
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P0128-THERMOSTAT RATIONALITY —
Continued
Symptom:
P0129-BAROMETRIC PRESSURE OUT-OF-RANGE
When Monitored and Set Condition:
P0129-BAROMETRIC PRESSURE OUT-OF-RANGE
When Monitored:
With the ignition key on. Engine speed at less than 250 RPM.
Set Condition:
The PCM senses the voltage from the MAP sensor to be greater than 4.9
volts (2.4 volts for Turbo) or below 2.28 volts (1.2 volts for Turbo) for 400 milliseconds. Two
Trip Fault.
POSSIBLE CAUSES
IAC SIGNAL CIRCUIT LOW
IAC SIGNAL CIRCUIT HIGH
INTERMITTENT CONDITION
(K7) 5 VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE
(K7) 5 VOLT SUPPLY CIRCUIT SHORTED TO GROUND
MAP SENSOR INTERNAL OPEN
(K7) 5 VOLT SUPPLY CIRCUIT OPEN
(K1) MAP SIGNAL CIRCUIT OPEN
(K1) MAP SIGNAL CIRCUIT SHORTED TO GROUND
PCM (K7) 5 VOLT SUPPLY CIRCUIT
PCM (K1) MAP SIGNAL
TEST
ACTION
APPLICABILITY
1
NOTE: Refer to any TSBs that may apply to this DTC before proceeding.
Ignition on, engine not running.
With the DRBIII
t, read the MAP Sensor voltage.
Is the voltage greater than 4.9 volts (2.4 volts for turbo)?
All
Yes
→ Go To 3
No
→ Go To 2
2
Ignition on, engine not running.
With the DRBIII
t, read the MAP Sensor voltage.
Is the voltage below 2.28 volts (1.2 volts for Turbo)?
All
Yes
→ Go To 3
No
→ Go To 13
313
DRIVEABILITY - NGC
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