DTC P0073:00 [PCM (SKYACTIV-D 2.2)]

id0102j5146000

DTC P0073:00

Ambient temperature sensor circuit high input

DETECTION CONDITION

•  The ambient temperature sensor voltage exceeds 4.9 V for a continuous 5 s.

Diagnostic support note

•  This is a continuous monitor (other).

•  The check engine light does not illuminate.

•  FREEZE FRAME DATA/Snapshot data is available.

•  DTC is stored in the PCM memory.

FAIL-SAFE FUNCTION

•  Not applicable

POSSIBLE CAUSE

•  Ambient temperature sensor connector or terminal malfunction

•  Ambient temperature sensor malfunction

•  PCM connector or terminal malfunction

•  Short to power supply in wiring harness between ambient temperature sensor terminal A and PCM terminal 2AX

•  Open circuit in wiring harness between the following terminals:

―  Ambient temperature sensor terminal A and PCM terminal 2AX

―  Ambient temperature sensor terminal B and PCM terminal 2AY

•  PCM malfunction

DTC P0073:00	Ambient temperature sensor circuit high input
DETECTION CONDITION	• The ambient temperature sensor voltage exceeds 4.9 V for a continuous 5 s. Diagnostic support note • This is a continuous monitor (other). • The check engine light does not illuminate. • FREEZE FRAME DATA/Snapshot data is available. • DTC is stored in the PCM memory.
FAIL-SAFE FUNCTION	• Not applicable
POSSIBLE CAUSE	• Ambient temperature sensor connector or terminal malfunction • Ambient temperature sensor malfunction • PCM connector or terminal malfunction • Short to power supply in wiring harness between ambient temperature sensor terminal A and PCM terminal 2AX • Open circuit in wiring harness between the following terminals: ― Ambient temperature sensor terminal A and PCM terminal 2AX ― Ambient temperature sensor terminal B and PCM terminal 2AY • PCM malfunction

Diagnostic Procedure

Step

Inspection

Results

Action

1

INSPECT AMBIENT TEMPERATURE SENSOR CONNECTOR CONDITION

•  Switch the ignition OFF.

•  Disconnect the ambient temperature sensor connector.

•  Inspect the connector engagement and connection condition, and inspect the terminals for damage, deformation, corrosion, or disconnection.

•  Is the connector normal?

Yes

Go to the next step.

No

Repair or replace the connector, then go to Step 6.

2

INSPECT PCM CONNECTOR CONDITION

•  Disconnect the PCM connector.

•  Inspect the connector engagement and connection condition, and inspect the terminals for damage, deformation, corrosion, or disconnection.

•  Is the connector normal?

Yes

Go to the next step.

No

Repair or replace the connector, then go to Step 6.

3

INSPECT AMBIENT TEMPERATURE SENSOR SIGNAL CIRCUIT FOR SHORT TO POWER SUPPLY

•  Verify that the ambient temperature sensor connector and the PCM connector are disconnected.

•  Switch the ignition ON (engine off).

•  Measure the voltage at ambient temperature sensor terminal A (vehicle wiring harness side).

•  Is the voltage 0 V?

Yes

Go to the next step.

No

Refer to the wiring diagram and verify if there is a common connector between ambient temperature sensor terminal A and PCM terminal 2AX.

If there is a common connector:

•  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for short to power supply to determine the malfunctioning location.

•  Repair or replace the malfunctioning location.

If there is no common connector:

•  Repair or replace the wiring harness which is shorted to the power supply.

Go to Step 6.

4

INSPECT AMBIENT TEMPERATURE SENSOR CIRCUIT FOR OPEN CIRCUIT

•  Verify that the ambient temperature sensor connector and the PCM connector are disconnected.

•  Switch the ignition OFF.

•  Inspect the wiring harness for continuity between the following terminals (vehicle wiring harness side).

―  Ambient temperature sensor terminal A and PCM terminal 2AX

―  Ambient temperature sensor terminal B and PCM terminal 2AY

•  Is there continuity?

Yes

Go to the next step.

No

Refer to the wiring diagram and verify if there is a common connector between the following terminals.

•  Ambient temperature sensor terminal A and PCM terminal 2AX

•  Ambient temperature sensor terminal B and PCM terminal 2AY

If there is a common connector:

―  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for an open circuit to determine the malfunctioning location.

―  Repair or replace the malfunctioning location.

If there is no common connector:

―  Repair or replace the wiring harness which has an open circuit.

Go to Step 6.

5

INSPECT AMBIENT TEMPERATURE SENSOR

•  Inspect the ambient temperature sensor.
(See AMBIENT TEMPERATURE SENSOR INSPECTION

•  Is the ambient temperature sensor normal?

Yes

Go to the next step.

No

Replace the ambient temperature sensor, then go to the next step.

(See AMBIENT TEMPERATURE SENSOR REMOVAL/INSTALLATION

6

VERIFY THAT REPAIRS HAVE BEEN COMPLETED

•  Reconnect all the disconnected connectors.

•  Refer to the [MEMORY CLEARING PROCEDURE] and clear the DTC.
(See CLEARING DTC [PCM (SKYACTIV-D 2.2)])

•  Perform the KOEO or KOER self-test.
(See KOEO/KOER SELF TEST [PCM (SKYACTIV-D 2.2)])

•  Has DTC P0073:00 been recorded?

Yes

Repeat the inspection from Step 1.

•  If the malfunction recurs, replace the PCM, then go to the next step.
(See PCM REMOVAL/INSTALLATION [SKYACTIV-D 2.2])

No

Go to the next step.

7

VERIFY OTHER DTCs

•  Has any other DTC or pending code been stored?

Yes

Repair the malfunctioning location according to the applicable DTC troubleshooting.

(See DTC TABLE [PCM (SKYACTIV-D 2.2)])

No

DTC troubleshooting completed.

Step	Inspection	Results	Action
1	INSPECT AMBIENT TEMPERATURE SENSOR CONNECTOR CONDITION • Switch the ignition OFF. • Disconnect the ambient temperature sensor connector. • Inspect the connector engagement and connection condition, and inspect the terminals for damage, deformation, corrosion, or disconnection. • Is the connector normal?	Yes	Go to the next step.
1		No	Repair or replace the connector, then go to Step 6.
2	INSPECT PCM CONNECTOR CONDITION • Disconnect the PCM connector. • Inspect the connector engagement and connection condition, and inspect the terminals for damage, deformation, corrosion, or disconnection. • Is the connector normal?	Yes	Go to the next step.
2		No	Repair or replace the connector, then go to Step 6.
3	INSPECT AMBIENT TEMPERATURE SENSOR SIGNAL CIRCUIT FOR SHORT TO POWER SUPPLY • Verify that the ambient temperature sensor connector and the PCM connector are disconnected. • Switch the ignition ON (engine off). • Measure the voltage at ambient temperature sensor terminal A (vehicle wiring harness side). • Is the voltage 0 V?	Yes	Go to the next step.
3		No	Refer to the wiring diagram and verify if there is a common connector between ambient temperature sensor terminal A and PCM terminal 2AX. If there is a common connector: • Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for short to power supply to determine the malfunctioning location. • Repair or replace the malfunctioning location. If there is no common connector: • Repair or replace the wiring harness which is shorted to the power supply. Go to Step 6.
4	INSPECT AMBIENT TEMPERATURE SENSOR CIRCUIT FOR OPEN CIRCUIT • Verify that the ambient temperature sensor connector and the PCM connector are disconnected. • Switch the ignition OFF. • Inspect the wiring harness for continuity between the following terminals (vehicle wiring harness side). ― Ambient temperature sensor terminal A and PCM terminal 2AX ― Ambient temperature sensor terminal B and PCM terminal 2AY • Is there continuity?	Yes	Go to the next step.
4		No	Refer to the wiring diagram and verify if there is a common connector between the following terminals. • Ambient temperature sensor terminal A and PCM terminal 2AX • Ambient temperature sensor terminal B and PCM terminal 2AY If there is a common connector: ― Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for an open circuit to determine the malfunctioning location. ― Repair or replace the malfunctioning location. If there is no common connector: ― Repair or replace the wiring harness which has an open circuit. Go to Step 6.
5	INSPECT AMBIENT TEMPERATURE SENSOR • Inspect the ambient temperature sensor. (See AMBIENT TEMPERATURE SENSOR INSPECTION • Is the ambient temperature sensor normal?	Yes	Go to the next step.
5		No	Replace the ambient temperature sensor, then go to the next step. (See AMBIENT TEMPERATURE SENSOR REMOVAL/INSTALLATION
6	VERIFY THAT REPAIRS HAVE BEEN COMPLETED • Reconnect all the disconnected connectors. • Refer to the [MEMORY CLEARING PROCEDURE] and clear the DTC. (See CLEARING DTC [PCM (SKYACTIV-D 2.2)]) • Perform the KOEO or KOER self-test. (See KOEO/KOER SELF TEST [PCM (SKYACTIV-D 2.2)]) • Has DTC P0073:00 been recorded?	Yes	Repeat the inspection from Step 1. • If the malfunction recurs, replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [SKYACTIV-D 2.2])
6		No	Go to the next step.
7	VERIFY OTHER DTCs • Has any other DTC or pending code been stored?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting. (See DTC TABLE [PCM (SKYACTIV-D 2.2)])
7		No	DTC troubleshooting completed.