Chrysler PT Cruiser. Manual - part 134

TEST

ACTION

APPLICABILITY

Turn the ignition off.
Disconnect the MAF/Ambient Temperature 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 on the Ambient Air Temperature Sensor Signal circuit.
Is the voltage below 1.0 volt?

All

Yes

→ Go To 3

→ Repair the Ambient Air Temperature Sensor Signal circuit for a

short to voltage.
Perform ROAD TEST VERIFICATION - VER-2.

NOTE: Remove the jumper wire.

Turn the ignition off.
Disconnect the ECM harness connectors.
Disconnect the MAF/Ambient Air Temperature Sensor harness connector.
Measure the resistance of the Ambient Air Temperature Sensor Signal circuit.
Is the resistance below 10.0 ohms?

All

Yes

→ Go To 4

→ Repair the Ambient Air Temperature Sensor Signal circuit for an

open.
Perform ROAD TEST VERIFICATION - VER-2.

Turn the ignition off.
Disconnect the MAF/Ambient Air Temperature Sensor harness connector.
Disconnect the ECM harness connectors.
Measure the resistance of the Sensor Ground circuit between the ECM harness
connector and the MAF/Ambient Air Temperature Sensor harness connector.
Is the resistance below 10.0 ohms?

All

Yes

→ Go To 5

→ Repair the Ambient Air Temperature Sensor Ground circuit for an

open.
Perform ROAD TEST VERIFICATION - VER-2.

Turn the ignition off.
Disconnect the MAF/Ambient Air Temperature Sensor harness connector.
Connect a jumper wire between the Ambient Air Temperature Sensor Signal and the
Sensor Ground circuits in the MAF/Ambient Air Temperature Sensor harness
connector.
Turn the ignition on.
Monitor the DRB for ECM DTCs.
Does the DRB display P0070 AMBIENT AIR TEMP. SENSOR CIRCUIT SIGNAL
VOLTAGE TOO LOW?

All

Yes

→ Replace the MAF/Ambient Air Temperature Sensor.

Perform ROAD TEST VERIFICATION - VER-2.

→ Replace and program the Engine Control Module in accordance

with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.

DRIVEABILITY - DIESEL

P0070-AMBIENT AIR TEMPERATURE CIRCUIT SIGNAL VOLTAGE TOO
HIGH —

Continued

TEST

ACTION

APPLICABILITY

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.
NOTE: The conditions that set the DTC are not present at this time. The
following list may help in identifying the intermittent condition.
With the engine running at normal operating temperature, monitor the DRB
parameters related to the DTC while wiggling the wiring harness. Look for param-
eter values to change and/or a DTC to set.
Review the DTC When Monitored and Set Conditions. If possible, try to duplicate the
conditions under which the DTC was set.
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 ROAD TEST VERIFICATION - VER-2.

→ Test Complete.

DRIVEABILITY - DIESEL

P0070-AMBIENT AIR TEMPERATURE CIRCUIT SIGNAL VOLTAGE TOO
HIGH —

Continued

Symptom:

P0070-AMBIENT AIR TEMPERATURE CIRCUIT SIGNAL VOLTAGE
TOO LOW

When Monitored and Set Condition:

P0070-AMBIENT AIR TEMPERATURE CIRCUIT SIGNAL VOLTAGE TOO LOW

When Monitored:

With the ignition on.

Set Condition:

When the ECM detects voltage below 0.073 volt on the Ambient Air

Temperature Sensor Signal circuit.

POSSIBLE CAUSES

INTERMITTENT CONDITION

AMBIENT AIR TEMP SENSOR SIGNAL CIRCUIT SHORTED TO GROUND

AMBIENT AIR TEMP SENSOR SIGNAL CIRCUIT SHORTED TO SENSOR GROUND

MAF/AMBIENT AIR TEMPERATURE SENSOR

ENGINE CONTROL MODULE

TEST

ACTION

APPLICABILITY

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, erase ECM DTCs.
Turn the ignition off, then on.
With the DRBIII

t, read the ECM DTCs.

Did this DTC set again?

All

Yes

→ Go To 2

→ Go To 5

Turn the ignition off.
Disconnect the ECM harness connectors.
Disconnect the MAF/Ambient Air Temperature Sensor harness connector.
Measure the resistance between ground and the Ambient Air Temperature Sensor
Signal circuit.
Is the resistance above 1000 ohms?

All

Yes

→ Go To 3

→ Repair the Ambient Air Temperature Sensor Signal circuit for a

short to ground.
Perform ROAD TEST VERIFICATION - VER-2.

DRIVEABILITY - DIESEL

TEST

ACTION

APPLICABILITY

Turn the ignition off.
Disconnect the ECM harness connectors.
Disconnect the MAF/Ambient Air Temperature Sensor harness connector.
Measure the resistance between the Ambient Air Temperature Sensor Signal circuit
and the Sensor Ground circuit.
Is the resistance above 1000 ohms?

All

Yes

→ Go To 4

→ Repair the Ambient Air Temperature Sensor Signal circuit for a

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

Turn the ignition off.
Disconnect the MAF/Ambient Air Temperature Sensor harness connector.
Turn the ignition on.
Monitor the DRB for ECM DTCs.
Does the DRB display P0070 AMBIENT AIR TEMP SIGNAL VOLTAGE TOO HIGH?

All

Yes

→ Replace the MAF/Ambient Air Temperature Sensor.

Perform ROAD TEST VERIFICATION - VER-2.

→ Replace and program the Engine Control Module in accordance

with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.

All

Yes

→ Repair as necessary.

Perform ROAD TEST VERIFICATION - VER-2.

→ Test Complete.

DRIVEABILITY - DIESEL

P0070-AMBIENT AIR TEMPERATURE CIRCUIT SIGNAL VOLTAGE TOO
LOW —

Continued

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