Chrysler PT Cruiser. Manual — part 182

TEST

ACTION

APPLICABILITY

8

Turn the ignition off.
Disconnect the APP Sensor harness connector.
Disconnect the ECM harness connectors.
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 APP Sensor Ground circuit.
Is the voltage above 1.0 volt?

All

Yes

→ Repair the App Sensor Ground circuit for a short to voltage.

Perform ROAD TEST VERIFICATION - VER-2.

No

→ Go To 9

9

Turn the ignition off.
Disconnect the APP Sensor harness connector.
Disconnect the ECM harness connectors.
Measure the resistance of the Sensor Ground circuit between the APP Sensor and the
ECM.
Is the resistance below 10.0 ohms?

All

Yes

→ Go To 10

No

→ Repair the APP Sensor Ground circuit for an open.

Perform ROAD TEST VERIFICATION - VER-2.

10

Turn the ignition off.
Disconnect the APP Sensor harness connector.
Using a 12-volt test light connected to 12-volts, check the Sensor Ground circuit of
the appropriate potentiometer.
Does the test light illuminate brightly?

All

Yes

→ Replace the Accelerator Pedal Position Sensor.

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.

11

Turn the ignition off.
Disconnect the APP Sensor harness connector.
Disconnect the ECM harness connectors.
Measure the resistance of the APP Sensor Signal circuit.
Is the resistance below 10.0 ohms?

All

Yes

→ Go To 12

No

→ Repair the APP Sensor Signal circuit for an open

Perform ROAD TEST VERIFICATION - VER-2.

12

Turn the ignition off.
Disconnect the APP Sensor harness connector.
Disconnect the ECM harness connectors.
Measure the resistance between ground and the APP Sensor Signal circuit.
Is the resistance below 1000 ohms?

All

Yes

→ Repair the APP Sensor Signal circuit for a short to ground.

Perform ROAD TEST VERIFICATION - VER-2.

No

→ Go To 13

208

DRIVEABILITY - DIESEL

P2120-ACC PEDAL POSITION SENSOR 1 CKT PLAUSIBILITY WITH
BRAKE SWITCH —

Continued

TEST

ACTION

APPLICABILITY

13

Turn the ignition off.
Disconnect the APP Sensor harness connector.
Disconnect the ECM harness connectors.
Measure the resistance between the APP Sensor Signal circuit and the Sensor
Ground circuit at the APP Sensor harness connector.
Is the resistance below 1000 ohms?

All

Yes

→ Repair the APP Sensor Signal and Sensor Ground circuits for a

short together.
Perform ROAD TEST VERIFICATION - VER-2.

No

→ Go To 14

14

Turn the ignition off.
Disconnect the APP Sensor harness connector.
Disconnect the ECM harness connectors.
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 APP Sensor Signal circuit.
Is the voltage above 1.0 volt?

All

Yes

→ Repair the APP Sensor Signal circuit for a short to voltage.

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.

15

Turn the ignition off.
Disconnect the APP Sensor harness connector.
Disconnect the ECM harness connectors.
Measure the resistance of the Accelerator Pedal Position Sensor 1 5-volt Supply
(Sensor Reference Voltage A on Sensor 2) circuit.
Is the resistance below 10.0 ohms?

All

Yes

→ Go To 16

No

→ Repair the Accelerator Pedal Position Sensor 1 5-Volt Supply

(Sensor Reference Voltage A on Sensor 2) circuit for an open.
Perform ROAD TEST VERIFICATION - VER-2.

16

Turn the ignition off.
Disconnect the APP Sensor harness connector.
Disconnect the ECM harness connectors.
Measure the resistance between the Accelerator Pedal Position Sensor 1 5-Volt
Supply (Sensor Reference Voltage A on Sensor 2) circuit and both Sensor Ground
circuits in the APP Sensor harness connector.
Is the resistance above 1000 ohms?

All

Yes

→ Go To 17

No

→ Repair the 5-Volt Supply (Sensor Reference Voltage A on Sensor 2)

circuit for a short to the Sensor Ground circuit.
Perform ROAD TEST VERIFICATION - VER-2.

209

DRIVEABILITY - DIESEL

P2120-ACC PEDAL POSITION SENSOR 1 CKT PLAUSIBILITY WITH
BRAKE SWITCH —

Continued

TEST

ACTION

APPLICABILITY

17

Turn the ignition off.
Disconnect the APP Sensor harness connector.
Disconnect the ECM harness connectors.
Measure the resistance between ground and the Accelerator Pedal Position Sensor 1
5-Volt Supply (Sensor Reference Voltage A on Sensor 2) circuit.
Is the resistance below 1000 ohms?

All

Yes

→ Repair the Accelerator Pedal Position Sensor 1 5-Volt Supply

(Sensor Reference Voltage A on Sensor 2) circuit for a short to
ground.
Perform ROAD TEST VERIFICATION - VER-2.

No

→ Go To 18

18

Turn the ignition off.
Disconnect the APP Sensor harness connector.
Disconnect the ECM harness connectors.
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 Accelerator Pedal Position Sensor 1 5-Volt Supply (Sensor
Reference Voltage A on Sensor 2) circuit in the ECM harness connector.
Is the voltage above 1.0 volt?

All

Yes

→ Repair the Accelerator Pedal Position Sensor 1 5-Volt Supply

(Sensor Reference Voltage A on Sensor 2) circuit for a short to
voltage.
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.

210

DRIVEABILITY - DIESEL

P2120-ACC PEDAL POSITION SENSOR 1 CKT PLAUSIBILITY WITH
BRAKE SWITCH —

Continued

Symptom:

*A/C INOPERATIVE

POSSIBLE CAUSES

A/C LOW PRESSURE SIGNAL CIRCUIT OPEN

A/C HIGH PRESSURE SWITCH OPEN

CHECK FOR ECM DTCS

FUSED B+ CIRCUIT OPEN

A/C COMPRESSOR CLUTCH RELAY

A/C LOW PRESSURE SWITCH OPEN

A/C COMPRESSOR CLUTCH RELAY OUTPUT CIRCUIT SHORTED TO GROUND

A/C HIGH PRESSURE SIGNAL CIRCUIT OPEN

A/C COMPRESSOR CLUTCH RELAY OUTPUT CIRCUIT OPEN

A/C REQUEST SIGNAL CIRCUIT OPEN

A/C COMPRESSOR CLUTCH GROUND CIRCUIT OPEN

A/C-HEATER CONTROL SWITCH

A/C CLUTCH

ECM - PRESSURE SIGNAL OPEN

TEST

ACTION

APPLICABILITY

1

NOTE: Ensure that the refrigerant system is properly charged. Refer to the
appropriate Service Information.
With the DRBIII

t, check for ECM DTCs.

Are any A/C related DTCs present?

All

Yes

→ Return to the symptom list and choose the symptom(s).

Perform ROAD TEST VERIFICATION - VER-2.

No

→ Go To 2

2

Turn the ignition on.
With the DRBIII

t, actuate the A/C Compressor Clutch Relay.

Observe the A/C Compressor Clutch during actuation.
Is the A/C Compressor Clutch clicking?

All

Yes

→ Go To 3

No

→ Go To 9

211

DRIVEABILITY - DIESEL