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

id0102t5213000

Outline

System malfunction location

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

Fail-safe

•  Not applicable

Possible cause

•  Blow-by heater relay malfunction

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

•  F10 15 A fuse malfunction

•  Blow-by heater connector or terminal malfunction

•  Short to ground in blow-by heater monitor circuit

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

•  PCM connector or terminal malfunction

•  Short to power supply in blow-by heater relay control circuit

•  Open circuit in blow-by heater monitor circuit

•  Open circuit in blow-by heater power supply circuit

•  Blow-by heater malfunction

•  PCM malfunction

System malfunction location	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
Fail-safe	• Not applicable
Possible cause	• Blow-by heater relay malfunction • Short to ground or open circuit in blow-by heater relay power supply circuit • F10 15 A fuse malfunction • Blow-by heater connector or terminal malfunction • Short to ground in blow-by heater monitor circuit • Short to ground in blow-by heater power supply circuit • PCM connector or terminal malfunction • Short to power supply in blow-by heater relay control circuit • Open circuit in blow-by heater monitor circuit • Open circuit in blow-by heater power supply circuit • 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

•  Record the freeze frame data/snapshot data.

Note

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

—

Go to the next step.

2

VERIFY RELATED REPAIR INFORMATION OR SERVICE INFORMATION AVAILABILITY

•  Verify related Service Bulletins, on-line repair information, or Service Information availability.

•  Is any related Information available?

Yes

Perform repair or diagnosis according to the available information.

•  If the vehicle is not repaired, go to the next step.

No

Go to the next step.

3

INSPECT BLOW-BY HEATER RELAY FOR MALFUNCTION

•  Switch the ignition OFF.

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

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

•  Is the blow-by heater relay normal?

Yes

Go to the next step.

No

Repair or replace the malfunctioning location and perform the repair completion verification.

4

INSPECT F10 15 A FUSE

•  Remove the F10 15 A Fuse.

•  Inspect the F10 15 A Fuse.

•  Is the fuse normal?

Yes

Reinstall the F10 15 A Fuse, then go to the next step.

No

Replace the F10 15 A Fuse and perform the repair completion verification.

5

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

•  Inspect the applicable circuit for a short to ground or open circuit.
(See CIRCUIT INSPECTION.)

•  Is the circuit normal?

Yes

Go to the next step.

No

Repair or replace the malfunctioning location and perform the repair completion verification.

6

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

•  Inspect the applicable circuit for a short to power supply.
(See CIRCUIT INSPECTION.)

•  Is the circuit normal?

Yes

Go to the next step.

No

Repair or replace the malfunctioning location and perform the repair completion verification.

7

INSPECT PCM CONTROL CIRCUIT FOR SHORT TO POWER SUPPLY

•  Inspect the applicable circuit for a short to power supply.
(See CIRCUIT INSPECTION.)

•  Is the circuit normal?

Yes

Go to the next step.

No

Repair or replace the malfunctioning location and perform the repair completion verification.

8

INSPECT BLOW-BY HEATER MONITOR CIRCUIT FOR SHORT TO GROUND

•  Inspect the applicable circuit for a short to ground.
(See CIRCUIT INSPECTION.)

•  Is the circuit normal?

Yes

Go to the next step.

No

Repair or replace the malfunctioning location and perform the repair completion verification.

9

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

•  Inspect the applicable circuit for a short to ground.
(See CIRCUIT INSPECTION.)

•  Is the circuit normal?

Yes

Go to the next step.

No

Repair or replace the malfunctioning location and perform the repair completion verification.

10

INSPECT PCM CONNECTOR FOR MALFUNCTION

•  Inspect the applicable connector and terminal.
(See CONNECTOR INSPECTION.)

•  Are the connector and terminal normal?

Yes

Go to the next step.

No

Repair or replace the malfunctioning location and perform the repair completion verification.

11

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

•  Inspect the applicable circuit for a short to power supply.
(See CIRCUIT INSPECTION.)

•  Is the circuit normal?

Yes

Go to the next step.

No

Repair or replace the malfunctioning location and perform the repair completion verification.

12

INSPECT BLOW-BY HEATER POWER SUPPLY CIRCUIT AND MONITOR CIRCUIT FOR OPEN CIRCUIT

•  Inspect the applicable circuit for open circuit.
(See CIRCUIT INSPECTION.)

•  Is the circuit normal?

Yes

Go to the next step.

No

Repair or replace the malfunctioning location and perform the repair completion verification.

13

INSPECT BLOW-BY HEATER FOR MALFUNCTION

•  Inspect the applicable part.
(See BLOW-BY HEATER INSPECTION [SKYACTIV-D 1.8].)

•  Is the part normal?

Yes

Go to the next step.

No

Repair or replace the malfunctioning location and perform the repair completion verification.

(See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)

Repair completion verification 1

VERIFY THAT VEHICLE IS REPAIRED

•  Install/connect the part removed/disconnected during the troubleshooting procedure.

•  Clear the DTC recorded in the memory.
(See CLEARING DTC.)

•  Replicate the vehicle conditions at the time the DTC was detected using the following procedure.

―  Perform the KOEO or KOER self-test.
(See DTC INSPECTION.)

•  Perform the DTC inspection for the PCM.
(See DTC INSPECTION.)

•  Is the same Pending DTC present?

Yes

Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error.

(See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [(E)].)

If the CAN communication is normal, perform the diagnosis from Step 1.

•  If the malfunction recurs, replace the PCM, then go to the next step.
(See PCM REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)

No

Go to the next step.

Repair completion verification 2

VERIFY IF OTHER DTCs DISPLAYED

•  Perform the DTC inspection.
(See DTC INSPECTION.)

•  Are any other DTCs displayed?

Yes

Repair the malfunctioning location according to the applicable DTC troubleshooting.

No

DTC troubleshooting completed.

Step	Inspection	Results	Action
1	RECORD VEHICLE STATUS WHEN DTC WAS DETECTED TO UTILIZE WITH REPEATABILITY VERIFICATION • Record the freeze frame data/snapshot data. Note • Recording can be facilitated using the screen capture function of the PC.	—	Go to the next step.
2	VERIFY RELATED REPAIR INFORMATION OR SERVICE INFORMATION AVAILABILITY • Verify related Service Bulletins, on-line repair information, or Service Information availability. • Is any related Information available?	Yes	Perform repair or diagnosis according to the available information. • If the vehicle is not repaired, go to the next step.
2		No	Go to the next step.
3	INSPECT BLOW-BY HEATER RELAY FOR MALFUNCTION • Switch the ignition OFF. • Remove the blow-by heater relay. (See RELAY LOCATION [(E)].) • Inspect the blow-by heater relay. (See RELAY INSPECTION.) • Is the blow-by heater relay normal?	Yes	Go to the next step.
3		No	Repair or replace the malfunctioning location and perform the repair completion verification.
4	INSPECT F10 15 A FUSE • Remove the F10 15 A Fuse. • Inspect the F10 15 A Fuse. • Is the fuse normal?	Yes	Reinstall the F10 15 A Fuse, then go to the next step.
4		No	Replace the F10 15 A Fuse and perform the repair completion verification.
5	INSPECT BLOW-BY HEATER RELAY POWER SUPPLY CIRCUIT FOR SHORT TO GROUND OR OPEN CIRCUIT • Inspect the applicable circuit for a short to ground or open circuit. (See CIRCUIT INSPECTION.) • Is the circuit normal?	Yes	Go to the next step.
5		No	Repair or replace the malfunctioning location and perform the repair completion verification.
6	INSPECT BLOW-BY HEATER CONTROL CIRCUIT FOR SHORT TO POWER SUPPLY • Inspect the applicable circuit for a short to power supply. (See CIRCUIT INSPECTION.) • Is the circuit normal?	Yes	Go to the next step.
6		No	Repair or replace the malfunctioning location and perform the repair completion verification.
7	INSPECT PCM CONTROL CIRCUIT FOR SHORT TO POWER SUPPLY • Inspect the applicable circuit for a short to power supply. (See CIRCUIT INSPECTION.) • Is the circuit normal?	Yes	Go to the next step.
7		No	Repair or replace the malfunctioning location and perform the repair completion verification.
8	INSPECT BLOW-BY HEATER MONITOR CIRCUIT FOR SHORT TO GROUND • Inspect the applicable circuit for a short to ground. (See CIRCUIT INSPECTION.) • Is the circuit normal?	Yes	Go to the next step.
8		No	Repair or replace the malfunctioning location and perform the repair completion verification.
9	INSPECT BLOW-BY HEATER POWER SUPPLY CIRCUIT FOR SHORT TO GROUND • Inspect the applicable circuit for a short to ground. (See CIRCUIT INSPECTION.) • Is the circuit normal?	Yes	Go to the next step.
9		No	Repair or replace the malfunctioning location and perform the repair completion verification.
10	INSPECT PCM CONNECTOR FOR MALFUNCTION • Inspect the applicable connector and terminal. (See CONNECTOR INSPECTION.) • Are the connector and terminal normal?	Yes	Go to the next step.
10		No	Repair or replace the malfunctioning location and perform the repair completion verification.
11	INSPECT BLOW-BY HEATER RELAY CONTROL CIRCUIT FOR SHORT TO POWER SUPPLY • Inspect the applicable circuit for a short to power supply. (See CIRCUIT INSPECTION.) • Is the circuit normal?	Yes	Go to the next step.
11		No	Repair or replace the malfunctioning location and perform the repair completion verification.
12	INSPECT BLOW-BY HEATER POWER SUPPLY CIRCUIT AND MONITOR CIRCUIT FOR OPEN CIRCUIT • Inspect the applicable circuit for open circuit. (See CIRCUIT INSPECTION.) • Is the circuit normal?	Yes	Go to the next step.
12		No	Repair or replace the malfunctioning location and perform the repair completion verification.
13	INSPECT BLOW-BY HEATER FOR MALFUNCTION • Inspect the applicable part. (See BLOW-BY HEATER INSPECTION [SKYACTIV-D 1.8].) • Is the part normal?	Yes	Go to the next step.
13		No	Repair or replace the malfunctioning location and perform the repair completion verification. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)
Repair completion verification 1	VERIFY THAT VEHICLE IS REPAIRED • Install/connect the part removed/disconnected during the troubleshooting procedure. • Clear the DTC recorded in the memory. (See CLEARING DTC.) • Replicate the vehicle conditions at the time the DTC was detected using the following procedure. ― Perform the KOEO or KOER self-test. (See DTC INSPECTION.) • Perform the DTC inspection for the PCM. (See DTC INSPECTION.) • Is the same Pending DTC present?	Yes	Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error. (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [(E)].) If the CAN communication is normal, perform the diagnosis from Step 1. • If the malfunction recurs, replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)
Repair completion verification 1		No	Go to the next step.
Repair completion verification 2	VERIFY IF OTHER DTCs DISPLAYED • Perform the DTC inspection. (See DTC INSPECTION.) • Are any other DTCs displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting.
Repair completion verification 2		No	DTC troubleshooting completed.