DTC P0647:00 [PCM (SKYACTIV-D 2.2)]

id0102j5587800

DTC P0647:00

A/C relay circuit high input

DETECTION CONDITION

•  When all of the following conditions are met, a condition whereby the A/C relay control circuit current is the specification or more continues for 5 s.

―  Battery positive voltage: 9—16 V

―  0.5 s have elapsed after ignition is switched ON (engine off or on)

―  During A/C relay on control

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

•  Stops the G-vectoring control (GVC).

•  Limits the engine transaxle total control.

•  Inhibits the A/C control.

POSSIBLE CAUSE

•  Front body control module (FBCM) detects DTC

•  A/C relay malfunction

•  Front body control module (FBCM) connector or terminal malfunction

•  Short to power supply in wiring harness between front body control module (FBCM) terminal 1C and A/C relay terminal A

•  PCM connector or terminal malfunction

•  Short to power supply in wiring harness between A/C relay terminal E and PCM terminal 2BA

•  Front body control module (FBCM) malfunction

•  PCM malfunction

DTC P0647:00	A/C relay circuit high input
DETECTION CONDITION	• When all of the following conditions are met, a condition whereby the A/C relay control circuit current is the specification or more continues for 5 s. ― Battery positive voltage: 9—16 V ― 0.5 s have elapsed after ignition is switched ON (engine off or on) ― During A/C relay on control 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	• Stops the G-vectoring control (GVC). • Limits the engine transaxle total control. • Inhibits the A/C control.
POSSIBLE CAUSE	• Front body control module (FBCM) detects DTC • A/C relay malfunction • Front body control module (FBCM) connector or terminal malfunction • Short to power supply in wiring harness between front body control module (FBCM) terminal 1C and A/C relay terminal A • PCM connector or terminal malfunction • Short to power supply in wiring harness between A/C relay terminal E and PCM terminal 2BA • Front body control module (FBCM) malfunction • PCM malfunction

Diagnostic Procedure

Step

Inspection

Results

Action

1

RECORD VEHICLE STATUS WHEN DTC WAS DETECTED TO UTILIZE WITH REPEATABILITY VERIFICATION

Note

•  Recording can be facilitated using the screen capture function of the PC.

•  Record the freeze frame data/snap shot data.

—

Go to the next step.

2

VERIFY FRONT BODY CONTROL MODULE (FBCM) DTCs

•  Perform the DTC inspection for the front body control module (FBCM) using the M-MDS.
(See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-D 2.2)].)

•  Is a DTC displayed?

Yes

Repair the malfunctioning location according to the applicable DTC troubleshooting.

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

No

Go to the next step.

3

INSPECT A/C RELAY FOR MALFUNCTION

•  Switch the ignition OFF.

•  Remove the A/C relay.

•  Inspect the A/C relay.
(See RELAY INSPECTION.)

•  Is the A/C relay normal?

Yes

Go to the next step.

No

Replace the A/C relay, then go to Step 9.

4

INSPECT FRONT BODY CONTROL MODULE (FBCM) CONNECTOR CONDITION

•  Disconnect the front body control module (FBCM) 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 9.

5

INSPECT A/C RELAY CIRCUIT FOR SHORT TO POWER SUPPLY

•  Verify that the A/C relay has been removed.

•  Verify that the front body control module (FBCM) connector is disconnected.

•  Switch the ignition ON (engine off).

•  Measure the voltage at A/C relay 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 front body control module (FBCM) terminal 1C and A/C relay terminal A.

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 9.

6

INSPECT PCM CONNECTOR CONDITION

•  Switch the ignition OFF.

•  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 9.

7

INSPECT A/C RELAY CIRCUIT FOR SHORT TO POWER SUPPLY

•  Verify that the A/C relay has been removed.

•  Verify that the front body control module (FBCM) connector and PCM connector are disconnected.

•  Switch the ignition ON (engine off).

•  Measure the voltage at A/C relay terminal E (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 A/C relay terminal E and PCM terminal 2BA.

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 9.

8

INSPECT FRONT BODY CONTROL MODULE (FBCM)

•  Inspect front body control module (FBCM).
(See FRONT BODY CONTROL MODULE (FBCM) INSPECTION.)

•  Is the front body control module (FBCM) normal?

Yes

Go to the next step.

No

Replace the front body control module (FBCM), then go to the next step.

(See FRONT BODY CONTROL MODULE (FBCM) REMOVAL/INSTALLATION.)

9

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)].)

•  Start the engine.

•  Switch the A/C between ON/OFF.

•  Display the DTCs using the M-MDS.
(See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-D 2.2)].)

•  Has DTC P0647:00 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.

10

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	RECORD VEHICLE STATUS WHEN DTC WAS DETECTED TO UTILIZE WITH REPEATABILITY VERIFICATION Note • Recording can be facilitated using the screen capture function of the PC. • Record the freeze frame data/snap shot data.	—	Go to the next step.
2	VERIFY FRONT BODY CONTROL MODULE (FBCM) DTCs • Perform the DTC inspection for the front body control module (FBCM) using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-D 2.2)].) • Is a DTC displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting. (See DTC TABLE [PCM (SKYACTIV-D 2.2)].)
2		No	Go to the next step.
3	INSPECT A/C RELAY FOR MALFUNCTION • Switch the ignition OFF. • Remove the A/C relay. • Inspect the A/C relay. (See RELAY INSPECTION.) • Is the A/C relay normal?	Yes	Go to the next step.
3		No	Replace the A/C relay, then go to Step 9.
4	INSPECT FRONT BODY CONTROL MODULE (FBCM) CONNECTOR CONDITION • Disconnect the front body control module (FBCM) 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.
4		No	Repair or replace the connector, then go to Step 9.
5	INSPECT A/C RELAY CIRCUIT FOR SHORT TO POWER SUPPLY • Verify that the A/C relay has been removed. • Verify that the front body control module (FBCM) connector is disconnected. • Switch the ignition ON (engine off). • Measure the voltage at A/C relay terminal A (vehicle wiring harness side). • Is the voltage 0 V?	Yes	Go to the next step.
5		No	Refer to the wiring diagram and verify if there is a common connector between front body control module (FBCM) terminal 1C and A/C relay terminal A. 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 9.
6	INSPECT PCM CONNECTOR CONDITION • Switch the ignition OFF. • 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.
6		No	Repair or replace the connector, then go to Step 9.
7	INSPECT A/C RELAY CIRCUIT FOR SHORT TO POWER SUPPLY • Verify that the A/C relay has been removed. • Verify that the front body control module (FBCM) connector and PCM connector are disconnected. • Switch the ignition ON (engine off). • Measure the voltage at A/C relay terminal E (vehicle wiring harness side). • Is the voltage 0 V?	Yes	Go to the next step.
7		No	Refer to the wiring diagram and verify if there is a common connector between A/C relay terminal E and PCM terminal 2BA. 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 9.
8	INSPECT FRONT BODY CONTROL MODULE (FBCM) • Inspect front body control module (FBCM). (See FRONT BODY CONTROL MODULE (FBCM) INSPECTION.) • Is the front body control module (FBCM) normal?	Yes	Go to the next step.
8		No	Replace the front body control module (FBCM), then go to the next step. (See FRONT BODY CONTROL MODULE (FBCM) REMOVAL/INSTALLATION.)
9	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)].) • Start the engine. • Switch the A/C between ON/OFF. • Display the DTCs using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-D 2.2)].) • Has DTC P0647:00 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].)
9		No	Go to the next step.
10	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)].)
10		No	DTC troubleshooting completed.