DTC P053B:00 [PCM (SKYACTIV-D 2.2)]

id0102j5213000

DTC P053B:00

Blow-by heater relay control circuit low input

DETECTION CONDITION

•  With the following conditions met, the blow-by heater power supply voltage is continuously lower than the specification for 5 s.

―  Battery positive voltage: 8 V or more

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

―  Blow-by heater relay controlled on

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

•  Blow-by heater relay malfunction

•  Short to ground or open circuit in blow-by heater relay power supply circuit

―  Short to ground in wiring harness between main relay terminal C and blow-by heater relay terminal D

―  Short to ground in wiring harness between main relay terminal C and blow-by heater relay terminal A

―  ENGINE3 15 A fuse malfunction

―  Open circuit in wiring harness between main relay terminal C and blow-by heater relay terminal D

―  Open circuit in wiring harness between main relay terminal C and blow-by heater relay terminal A

•  Blow-by heater connector or terminal malfunction

•  Short to ground in wiring harness between the following terminals:

―  Blow-by heater relay terminal C and blow-by heater terminal A

―  Blow-by heater relay terminal C and PCM terminal 2D

•  PCM connector or terminal malfunction

•  Short to power supply in wiring harness between blow-by heater relay terminal E and PCM terminal 2C

•  Open circuit in wiring harness between the following terminals:

―  Blow-by heater relay terminal C and PCM terminal 2D

―  Blow-by heater relay terminal E and PCM terminal 2C

•  Blow-by heater malfunction

•  PCM malfunction

DTC P053B:00	Blow-by heater relay control circuit low input
DETECTION CONDITION	• With the following conditions met, the blow-by heater power supply voltage is continuously lower than the specification for 5 s. ― Battery positive voltage: 8 V or more ― 0.5 s have elapsed after ignition is switched ON (engine off or on) ― Blow-by heater relay controlled on 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	• Blow-by heater relay malfunction • Short to ground or open circuit in blow-by heater relay power supply circuit ― Short to ground in wiring harness between main relay terminal C and blow-by heater relay terminal D ― Short to ground in wiring harness between main relay terminal C and blow-by heater relay terminal A ― ENGINE3 15 A fuse malfunction ― Open circuit in wiring harness between main relay terminal C and blow-by heater relay terminal D ― Open circuit in wiring harness between main relay terminal C and blow-by heater relay terminal A • Blow-by heater connector or terminal malfunction • Short to ground in wiring harness between the following terminals: ― Blow-by heater relay terminal C and blow-by heater terminal A ― Blow-by heater relay terminal C and PCM terminal 2D • PCM connector or terminal malfunction • Short to power supply in wiring harness between blow-by heater relay terminal E and PCM terminal 2C • Open circuit in wiring harness between the following terminals: ― Blow-by heater relay terminal C and PCM terminal 2D ― Blow-by heater relay terminal E and PCM terminal 2C • Blow-by heater 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

INSPECT BLOW-BY HEATER RELAY FOR MALFUNCTION

•  Switch the ignition OFF.

•  Remove the blow-by heater relay.
(See RELAY LOCATION.)

•  Inspect the blow-by heater relay.
(See RELAY INSPECTION.)

•  Is the blow-by heater relay normal?

Yes

Go to the next step.

No

Replace the blow-by heater relay, then go to Step 10.

3

INSPECT BLOW-BY HEATER RELAY POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT OR SHORT TO GROUND

•  Verify that the blow-by heater relay is removed.

•  Switch the ignition ON (engine off).

Note

•  Another DTC may be stored by the PCM detecting an open circuit.

•  Measure the voltage at the following terminals (vehicle wiring harness side).

―  Blow-by heater relay terminal D

―  Blow-by heater relay terminal A

•  Is the voltage B+?

Yes

Go to the next step.

No

Inspect the ENGINE3 15 A fuse.

If the fuse is blown:

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

―  Main relay terminal C and blow-by heater relay terminal D

―  Main relay terminal C and blow-by heater 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 ground 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 ground.

•  Replace the fuse.

If the fuse is damaged:

•  Replace the fuse.

If the fuse is normal:

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

―  Main relay terminal C and blow-by heater relay terminal D

―  Main relay terminal C and blow-by heater 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 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 10.

4

INSPECT BLOW-BY HEATER CONNECTOR CONDITION

•  Switch the ignition OFF.

•  Disconnect the blow-by heater 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 10.

5

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 10.

6

INSPECT BLOW-BY HEATER MONITOR CIRCUIT FOR SHORT TO GROUND

•  Verify that the blow-by heater relay is removed.

•  Verify that the blow-by heater connector is disconnected.

•  Inspect for continuity between blow-by heater relay terminal C (vehicle wiring harness side) and body ground.

•  Is there continuity?

Yes

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

•  Blow-by heater relay terminal C and blow-by heater terminal A

•  Blow-by heater relay terminal C and PCM terminal 2D

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 ground 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 ground.

Go to Step 10.

No

Go to the next step.

7

INSPECT BLOW-BY HEATER RELAY CONTROL CIRCUIT FOR SHORT TO POWER SUPPLY

•  Verify that the blow-by heater relay is removed.

•  Verify that the blow-by heater connector and the PCM connector are disconnected.

•  Switch the ignition ON (engine off).

Note

•  Another DTC may be stored by the PCM detecting an open circuit.

•  Measure the voltage at blow-by heater 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 blow-by heater relay terminal E and PCM terminal 2C.

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 10.

8

INSPECT BLOW-BY HEATER RELAY CIRCUIT FOR OPEN CIRCUIT

•  Verify that the blow-by heater relay is removed.

•  Verify that the blow-by heater 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).

―  Blow-by heater relay terminal C and PCM terminal 2D

―  Blow-by heater relay terminal E and PCM terminal 2C

•  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.

•  Blow-by heater relay terminal C and PCM terminal 2D

•  Blow-by heater relay terminal E and PCM terminal 2C

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 10.

9

INSPECT BLOW-BY HEATER

•  Inspect the blow-by heater.
(See BLOW-BY HEATER INSPECTION [SKYACTIV-D 2.2].)

•  Is the blow-by heater normal?

Yes

Go to the next step.

No

Replace the blow-by heater, then go to the next step.

(See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [SKYACTIV-D 2.2].)

10

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 P053B: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.

11

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	INSPECT BLOW-BY HEATER RELAY FOR MALFUNCTION • Switch the ignition OFF. • Remove the blow-by heater relay. (See RELAY LOCATION.) • Inspect the blow-by heater relay. (See RELAY INSPECTION.) • Is the blow-by heater relay normal?	Yes	Go to the next step.
2		No	Replace the blow-by heater relay, then go to Step 10.
3	INSPECT BLOW-BY HEATER RELAY POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT OR SHORT TO GROUND • Verify that the blow-by heater relay is removed. • Switch the ignition ON (engine off). Note • Another DTC may be stored by the PCM detecting an open circuit. • Measure the voltage at the following terminals (vehicle wiring harness side). ― Blow-by heater relay terminal D ― Blow-by heater relay terminal A • Is the voltage B+?	Yes	Go to the next step.
3		No	Inspect the ENGINE3 15 A fuse. If the fuse is blown: • Refer to the wiring diagram and verify if there is a common connector between the following terminals. ― Main relay terminal C and blow-by heater relay terminal D ― Main relay terminal C and blow-by heater 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 ground 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 ground. • Replace the fuse. If the fuse is damaged: • Replace the fuse. If the fuse is normal: • Refer to the wiring diagram and verify if there is a common connector between the following terminals. ― Main relay terminal C and blow-by heater relay terminal D ― Main relay terminal C and blow-by heater 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 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 10.
4	INSPECT BLOW-BY HEATER CONNECTOR CONDITION • Switch the ignition OFF. • Disconnect the blow-by heater 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 10.
5	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.
5		No	Repair or replace the connector, then go to Step 10.
6	INSPECT BLOW-BY HEATER MONITOR CIRCUIT FOR SHORT TO GROUND • Verify that the blow-by heater relay is removed. • Verify that the blow-by heater connector is disconnected. • Inspect for continuity between blow-by heater relay terminal C (vehicle wiring harness side) and body ground. • Is there continuity?	Yes	Refer to the wiring diagram and verify if there is a common connector between the following terminals. • Blow-by heater relay terminal C and blow-by heater terminal A • Blow-by heater relay terminal C and PCM terminal 2D 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 ground 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 ground. Go to Step 10.
6		No	Go to the next step.
7	INSPECT BLOW-BY HEATER RELAY CONTROL CIRCUIT FOR SHORT TO POWER SUPPLY • Verify that the blow-by heater relay is removed. • Verify that the blow-by heater connector and the PCM connector are disconnected. • Switch the ignition ON (engine off). Note • Another DTC may be stored by the PCM detecting an open circuit. • Measure the voltage at blow-by heater 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 blow-by heater relay terminal E and PCM terminal 2C. 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 10.
8	INSPECT BLOW-BY HEATER RELAY CIRCUIT FOR OPEN CIRCUIT • Verify that the blow-by heater relay is removed. • Verify that the blow-by heater 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). ― Blow-by heater relay terminal C and PCM terminal 2D ― Blow-by heater relay terminal E and PCM terminal 2C • Is there continuity?	Yes	Go to the next step.
8		No	Refer to the wiring diagram and verify if there is a common connector between the following terminals. • Blow-by heater relay terminal C and PCM terminal 2D • Blow-by heater relay terminal E and PCM terminal 2C 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 10.
9	INSPECT BLOW-BY HEATER • Inspect the blow-by heater. (See BLOW-BY HEATER INSPECTION [SKYACTIV-D 2.2].) • Is the blow-by heater normal?	Yes	Go to the next step.
9		No	Replace the blow-by heater, then go to the next step. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [SKYACTIV-D 2.2].)
10	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 P053B: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].)
10		No	Go to the next step.
11	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)].)
11		No	DTC troubleshooting completed.