Chrysler PT Cruiser. Manual — part 184
TEST
ACTION
APPLICABILITY
4
Turn the ignition off.
Disconnect the A/C-Heater Control Switch harness connector.
Start the engine.
Is the A/C Compressor off?
All
Yes
→ Replace the A/C-Heater Control Switch.
Perform ROAD TEST VERIFICATION - VER-2.
No
→ Go To 5
5
Turn the ignition off.
Disconnect the A/C Low Pressure Switch harness connector.
Disconnect the A/C - Heater Control Switch harness connector.
Measure the resistance between ground and the A/C Request Signal circuit.
Is the resistance above 100 kohms?
All
Yes
→ Go To 6
No
→ Repair the A/C Request Signal circuit for a short to ground.
Perform ROAD TEST VERIFICATION - VER-2.
6
Turn the ignition off.
Disconnect the A/C Low Pressure Switch harness connector.
Start the engine.
Is the A/C Compressor off?
All
Yes
→ Replace the A/C Low Pressure Switch.
Perform ROAD TEST VERIFICATION - VER-2.
No
→ Go To 7
7
Turn the ignition off.
Disconnect the A/C Low Pressure Switch harness connector.
Disconnect the A/C High Pressure Switch harness connector.
Measure the resistance between ground and the A/C Low Pressure Signal circuit.
Is the resistance above 100 kohms?
All
Yes
→ Go To 8
No
→ Repair the A/C Low Pressure Signal circuit for a short to ground.
Perform ROAD TEST VERIFICATION - VER-2.
8
Turn the ignition off.
Disconnect the A/C High Pressure Switch harness connector.
Start the engine.
Is the A/C Compressor off?
All
Yes
→ Replace the A/C High Pressure Switch.
Perform ROAD TEST VERIFICATION - VER-2.
No
→ Go To 9
9
Turn the ignition off.
Disconnect the ECM harness connectors.
Disconnect the A/C High Pressure Switch harness connector.
Measure the resistance between ground and the A/C High Pressure Signal circuit.
Is the resistance above 1000 ohms?
All
Yes
→ Go To 10
No
→ Repair the A/C High Pressure Signal circuit for a short to ground.
Perform ROAD TEST VERIFICATION - VER-2.
216
DRIVEABILITY - DIESEL
*A/C OPERATES IN ALL MODE SWITCH POSITIONS —
Continued
TEST
ACTION
APPLICABILITY
10
Turn the ignition off.
Install a substitute relay in place of the A/C Compressor Clutch Relay.
Turn the ignition on.
With the DRBIII
t, actuate the A/C Compressor Clutch Relay.
Does the A/C Compressor Clutch cycle on and off?
All
Yes
→ Replace the A/C Compressor Clutch Relay.
Perform ROAD TEST VERIFICATION - VER-2.
No
→ Replace and program the Engine Control Module in accordance
with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
217
DRIVEABILITY - DIESEL
*A/C OPERATES IN ALL MODE SWITCH POSITIONS —
Continued
Symptom:
*CHECKING THE ACCELERATOR PEDAL POSITION SENSOR
CALIBRATION
POSSIBLE CAUSES
APP SENSOR 1
APP SENSOR 2
APP SENSOR IDLE VOLTAGE
APP SENSOR WIDE OPEN THROTTLE VOLTAGE
TEST
ACTION
APPLICABILITY
1
NOTE: The APP Sensor is a device that contains 2 separate potentiometer
type sensors. Each sensor has its own 5-volt supply circuit, sensor ground
circuit and signal circuit. The APP Sensor no longer incorporates a low-idle
switch.
NOTE: The APP Sensor 1 signal should always be 1.7 times the voltage of the
APP Sensor 2 signal.
NOTE: Ensure the accelerator pedal is free from any restriction or binding
before continuing.
Turn the ignition on.
With the DRB, read the APP Sensor 1 and APP Sensor 2 Volts with the accelerator
pedal in the at rest position.
Does the DRB display between 0.67 and 1.03 volt for sensor 1 and 0.39 and 0.60 volt
for sensor 2?
All
Yes
→ Go To 2
No
→ Replace the APP Sensor in accordance with the Service Informa-
tion.
Perform ROAD TEST VERIFICATION - VER-2.
2
Turn the ignition on.
While back probing, measure the voltage of the APP Sensor 1 Signal circuit at the
ECM.
Monitor the voltmeter while slowly pressing the accelerator pedal completely down.
Did the voltage increase smoothly with pedal travel?
All
Yes
→ Go To 3
No
→ Replace the Accelerator Pedal Position Sensor in accordance with
the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
3
Turn the ignition on.
While back probing, measure the voltage of the APP Sensor 2 Signal circuit at the
ECM.
Monitor the voltmeter while slowly pressing the accelerator pedal completely down.
Did the voltage increase smoothly with pedal travel?
All
Yes
→ Go To 4
No
→ Replace the Accelerator Pedal Position Sensor in accordance with
the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
218
DRIVEABILITY - DIESEL
TEST
ACTION
APPLICABILITY
4
Turn the ignition on.
Fully depress the accelerator pedal.
With the DRB, read the voltage for APP Sensor 1 and APP Sensor 2.
Does the DRB display between 3.79 and 4.55 volts for sensor 1 and 2.23 and 2.67 volts
for sensor 2?
All
Yes
→ Test Complete.
No
→ Replace the APP Sensor.
Perform ROAD TEST VERIFICATION - VER-2.
219
DRIVEABILITY - DIESEL
*CHECKING THE ACCELERATOR PEDAL POSITION SENSOR CALI-
BRATION —
Continued
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