Chrysler PT Cruiser. Manual — part 189
Symptom:
*CHECKING THE SPEED CONTROL OPERATION
POSSIBLE CAUSES
BRAKE SWITCH SIGNAL
ECM DTC(S) PRESENT
ENGINE CONTROL MODULE
SPEED CONTROL SWITCH
VSS SIGNAL
INTERMITTENT CONDITION
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, read the ECM DTCs.
Are there any ECM DTCs present?
All
Yes
→ Refer to symptom list for problems related to the ECM DTC.
Perform SPEED CONTROL VERIFICATION - VER-4.
No
→ Go To 2
2
Start the engine.
With the DRBIII
t, read the S/C SWITCH VOLTS.
Observe the S/C Switch volts on the DRBIII
t while pressing and holding the S/C
Switch lever in each position separately.
NOTE: Pressing the cruise lever to each of its positions should result in the
following voltages: ON/OFF 0.60 - 1.15v, COAST/SET 3.17 - 3.57v, ACC/RES
3.89 - 4.19v, CANCEL 1.60 - 2.00v, Switch lever at rest 4.33 - 4.80v.
Does each switch position produce the correct voltage?
All
Yes
→ Go To 3
No
→ Refer to symptom list for problems related to the S/C Switch.
Perform SPEED CONTROL VERIFICATION - VER-4.
3
Test drive the vehicle above 60 km/h (35 MPH).
Attempt to Set the Speed Control.
Does the Speed Control function properly?
All
Yes
→ Test Complete.
No
→ Go To 4
4
Turn the ignition on.
With the DRBIII
t in Sensors, read Vehicle Speed.
Have an assistant drive the vehicle while you are observing the Vehicle Speed on the
DRBIII
t.
While observing vehicle speed on the DRBIII
t, note any rapid changes (signal
dropouts) in the reading that do not correspond with actual vehicle speed.
Is the DRBIII
t displaying an accurate vehicle speed?
All
Yes
→ Go To 5
No
→ Refer to symptom list for problems related to the Vehicle Speed
Sensor.
Perform SPEED CONTROL VERIFICATION - VER-4.
236
DRIVEABILITY - DIESEL
TEST
ACTION
APPLICABILITY
5
Turn the ignition on.
With the DRBIII
t in Inputs/Outputs, read the Primary and Secondary brake switch
states while pressing and releasing the Brake Pedal several times.
Did the DRBIII
t indicate the correct brake pedal state when pressing and releasing
the Brake Pedal?
All
Yes
→ Go To 6
No
→ Refer to symptom list for problems related to Brake Switch
Signal.
Perform SPEED CONTROL VERIFICATION - VER-4.
6
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 (TSB) that may apply.
Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or
partially broken wires.
Visually inspect the related wiring harness connectors. Look for broken, bent, pushed
out, or corroded terminals.
Were any of the above conditions present?
All
Yes
→ Repair as necessary.
Perform SPEED CONTROL VERIFICATION - VER-4.
No
→ Replace and program the Engine Control Module in accordance
with the Service Information.
Perform SPEED CONTROL VERIFICATION - VER-4.
237
DRIVEABILITY - DIESEL
*CHECKING THE SPEED CONTROL OPERATION —
Continued
Symptom:
*CHECKING THE VEHICLE SPEED SIGNAL
POSSIBLE CAUSES
ENGINE CONTROL MODULE
VSS DTCS PRESENT
SENSOR REFERENCE VOLTAGE B CIRCUIT SHORTED TO GROUND
SENSOR REFERENCE VOLTAGE B CIRCUIT SHORTED TO VOLTAGE
SPEEDOMETER PINION AND DRIVE TEETH DAMAGED
VEHICLE SPEED SENSOR SIGNAL CIRCUIT SHORTED TO GROUND
VEHICLE SPEED SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE
SENSOR REFERENCE VOLTAGE B CIRCUIT SHORTED TO SENSOR GROUND
VEHICLE SPEED SENSOR SIGNAL CIRCUIT SHORTED TO SENSOR GROUND
SENSOR REFERENCE VOLTAGE B CIRCUIT OPEN
VEHICLE SPEED SENSOR SIGNAL CIRCUIT OPEN
ECM - SENSOR GROUND CIRCUIT OPEN
SENSOR GROUND CIRCUIT OPEN
VEHICLE SPEED SENSOR
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRB, select Engine, then Sensors.
While an assistant is test driving the vehicle, note the Vehicle Speed reading on the
DRB.
While reading the VSS Signal, note any rapid changes (signal drop-outs) that do not
correspond with actual vehicle speed.
Does the DRB display an accurate vehicle speed reading?
All
Yes
→ Test Complete.
No
→ Go To 2
2
Turn the ignition on.
With the DRB, read ECM DTCs.
Are any VSS DTCs present?
All
Yes
→ Refer to symptom list for problems related to VSS DTCs.
Perform ROAD TEST VERIFICATION - VER-2.
No
→ Go To 3
238
DRIVEABILITY - DIESEL
TEST
ACTION
APPLICABILITY
3
Turn the ignition off.
Remove the Vehicle Speed Sensor.
Inspect the Speedometer Pinion and drive teeth on the Output Shaft (located in the
transmission).
Inspect the VSS for metal debris and damage to the Sensor and connector.
Are both components OK?
All
Yes
→ Go To 4
No
→ Repair or replace the Speedometer Pinion or internal components
as necessary in accordance with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
4
Turn the ignition off.
Disconnect the Vehicle Speed Sensor harness connector.
Turn the ignition on.
Measure the voltage of the Vehicle Speed Sensor Signal circuit.
Choose the following voltage range that the signal circuit measured in.
All
Below 4.5 volts
Between 4.5 and 5.5 volts
Above 5.5 volts
5
Turn the ignition off.
Disconnect the ECM harness connectors.
Disconnect the Vehicle Speed Sensor harness connector.
Measure the resistance of the Vehicle Speed Sensor Signal circuit.
Is the resistance below 10.0 ohms?
All
Yes
→ Go To 6
No
→ Repair the Vehicle Speed Sensor Signal circuit for an open.
Perform ROAD TEST VERIFICATION - VER-2.
6
Turn the ignition off.
Disconnect the ECM harness connectors.
Disconnect the Vehicle Speed Sensor harness connector.
Measure the resistance between ground and the Vehicle Speed Sensor Signal circuit.
Is the resistance above 1000 ohms?
All
Yes
→ Go To 7
No
→ Repair the Vehicle Speed Sensor Signal circuit for a short to
ground.
Perform ROAD TEST VERIFICATION - VER-2.
239
DRIVEABILITY - DIESEL
*CHECKING THE VEHICLE SPEED SIGNAL —
Continued
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