Chrysler PT Cruiser. Manual — part 156
TEST
ACTION
APPLICABILITY
8
Turn the ignition off.
Disconnect the Vehicle Speed Sensor harness connector.
Turn the ignition on.
Measure the voltage of the Sensor Reference Voltage B circuit.
Choose the voltage range in which the Sensor Reference Voltage B circuit measured.
All
Below 4.5 volts
Between 4.5 and 5.5 volts
Above 5.5 volts
9
Turn the ignition off.
Disconnect the ECM harness connectors.
Disconnect the Vehicle Speed Sensor harness connector.
Measure the resistance of the Sensor Reference Voltage B circuit.
Is the resistance below 10.0 ohms?
All
Yes
→ Go To 10
No
→ Repair the Sensor Reference Voltage B circuit for an open.
Perform ROAD TEST VERIFICATION - VER-2.
10
Turn the ignition off.
Disconnect the ECM harness connectors.
Disconnect the Vehicle Speed Sensor harness connector.
Measure the resistance between ground and the Sensor Reference Voltage B circuit.
Is the resistance above 1000 ohms?
All
Yes
→ Go To 11
No
→ Repair the Sensor Reference Voltage B circuit for a short to
ground.
Perform ROAD TEST VERIFICATION - VER-2.
11
Turn the ignition off.
Disconnect the Vehicle Speed Sensor harness connector.
Disconnect the ECM harness connectors.
Measure the resistance between the Sensor Reference Voltage B circuit and the
Sensor Ground circuit at the VSS harness connector.
Is the resistance above 1000 ohms?
All
Yes
→ Replace and program the ECM in accordance with the Service
Information.
Perform ROAD TEST VERIFICATION - VER-2.
No
→ Repair the Sensor Reference Voltage B circuit for a short to the
Sensor Ground circuit.
Perform ROAD TEST VERIFICATION - VER-2.
104
DRIVEABILITY - DIESEL
P0500-VEHICLE SPEED SENSOR FREQUENCY TOO HIGH —
Continued
TEST
ACTION
APPLICABILITY
12
Turn the ignition off.
Disconnect the ECM harness connectors.
Disconnect the Vehicle Speed Sensor harness connector.
Measure the resistance of the Vehicle Speed Sensor Ground circuit.
Is the resistance below 10.0 ohms?
All
Yes
→ Go To 13
No
→ Repair the Sensor Ground circuit for an open.
Perform ROAD TEST VERIFICATION - VER-2.
13
Turn the ignition off.
Disconnect the Vehicle Speed Sensor harness connector.
Turn the ignition on.
Measure the voltage between the Sensor Reference Voltage B circuit and Sensor
Ground circuit in the VSS harness connector.
Is the voltage above 4.5 volts?
All
Yes
→ Go To 14
No
→ Replace and program the Engine Control Module in accordance
with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
14
Block the rear wheels to prevent the vehicle from rolling backward as necessary and
lift the front wheels of the vehicle off the ground.
Using the Labscope function of the DRB, set the Range to ±20.0v, Offset to 4.00v,
Probe to x10, Coupling to DC, then the Time/Division to +10ms/Div.
Backprobe the VSS Signal circuit at the ECM with the Labscope probe.
Start the engine and place the transmission in first gear with the engine at idle .
NOTE: The speedometer should read approximately 8 km/h (5 MPH) at idle.
Compare the resulting Labscope pattern with the VSS graphic in the Charts and
Graphs section of this manual.
Is the Labscope pattern of this vehicle similar to the VSS graphic?
All
Yes
→ Replace and program the ECM in accordance with the Service
Information.
Perform ROAD TEST VERIFICATION - VER-2.
No
→ Replace the Vehicle Speed Sensor.
Perform ROAD TEST VERIFICATION - VER-2.
15
Turn the ignition off.
Disconnect the ECM harness connectors.
Disconnect the Vehicle Speed Sensor harness connector.
Remove the ASD Relay from the PDC.
Connect a jumper wire between cavity 30 and cavity 87 of the ASD Relay connector.
Turn the ignition on.
Measure the voltage of the Sensor Reference Voltage B circuit.
Is the voltage below 1.0 volt?
All
Yes
→ Replace and program the ECM in accordance with the Service
Information.
Perform ROAD TEST VERIFICATION - VER-2.
No
→ Repair the Sensor Reference Voltage B circuit for a short to
voltage.
Perform ROAD TEST VERIFICATION - VER-2.
105
DRIVEABILITY - DIESEL
P0500-VEHICLE SPEED SENSOR FREQUENCY TOO HIGH —
Continued
TEST
ACTION
APPLICABILITY
16
Turn the ignition off.
Disconnect the ECM harness connectors.
Disconnect the Vehicle Speed Sensor harness connector.
Remove the ASD Relay from the PDC.
Connect a jumper wire between cavity 30 and cavity 87 of the ASD Relay connector.
Turn the ignition on.
Measure the voltage of the Vehicle Speed Sensor Signal circuit.
Is the voltage below 1.0 volt?
All
Yes
→ Replace and program the ECM in accordance with the Service
Information.
Perform ROAD TEST VERIFICATION - VER-2.
No
→ Repair the Vehicle Speed Sensor Signal circuit for a short to
voltage.
Perform ROAD TEST VERIFICATION - VER-2.
106
DRIVEABILITY - DIESEL
P0500-VEHICLE SPEED SENSOR FREQUENCY TOO HIGH —
Continued
Symptom:
P0514-BATTERY TEMP SENSOR CIRCUIT SIGNAL VOLTAGE TOO
HIGH
When Monitored and Set Condition:
P0514-BATTERY TEMP SENSOR CIRCUIT SIGNAL VOLTAGE TOO HIGH
When Monitored:
With the ignition on.
Set Condition:
The ECM detects Battery Temperature Sensor Signal voltage above 4.87
volts.
POSSIBLE CAUSES
INTERMITTENT CONDITION
BATTERY TEMPERATURE SENSOR GROUND CIRCUIT OPEN
BATTERY TEMPERATURE SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE
BATTERY TEMPERATURE SENSOR
BATTERY TEMPERATURE SENSOR SIGNAL CIRCUIT OPEN
ENGINE CONTROL MODULE
TEST
ACTION
APPLICABILITY
1
NOTE: If the ECM detects and stores a DTC, the ECM also stores the
engine/vehicle operating conditions under which the DTC was set. Some of
these conditions are displayed on the DRB at the same time the DTC is
displayed.
NOTE: Before erasing stored DTCs, record these conditions. Attempting to
duplicate these conditions may assist when checking for an active DTC.
Turn the ignition on.
With the DRB, monitor the Battery Temperature Sensor voltage.
Is the voltage above 4.5 volts?
All
Yes
→ Go To 2
No
→ Go To 6
2
Turn the ignition off.
Disconnect the Battery Temperature Sensor harness connector.
Turn the ignition on.
Measure the voltage on the Battery Temperature Sensor Signal circuit.
Is the voltage above 5.5 volts?
All
Yes
→ Repair the Battery Temperature Sensor Signal circuit for a short
to voltage.
Perform ROAD TEST VERIFICATION - VER-2.
No
→ Go To 3
107
DRIVEABILITY - DIESEL
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