DTC C0020:01/C0020:13/C0020:16/C0020:49/C0020:71/C0020:98 [DSC HU/CM]

id040262846000

DTC

C0020:01

Pump motor

C0020:13

C0020:16

C0020:49

C0020:71

C0020:98

DETECTION CONDITION

•  RR outlet solenoid valve malfunction is detected.

FAIL-SAFE FUNCTION

•  Refer to “Fail-safe function table”. (See DTC TABLE [DSC HU/CM].)

POSSIBLE CAUSE

Without i-ELOOP

•  Fuse (ABS/DSCM 50A) malfunction

•  Open or short circuit in wiring harness between battery and DSC HU/CM terminal B

•  Open circuit in wiring harness between DSC HU/CM terminal AL and body ground

•  Poor connection at each connector

•  Pump motor malfunction

•  Pump motor is driven for long periods

With i-ELOOP

•  Fuse (ABS/DSCM 50A) malfunction

•  Short or open circuit in wiring harness between battery and DC-DC converter terminal 3A

•  Open or short circuit in wiring harness between DC-DC converter terminal 4A and DSC HU/CM terminal B

•  Open circuit in wiring harness between DSC HU/CM terminal AL and body ground

•  Poor connection at each connector

•  Pump motor malfunction

•  Pump motor is driven for long periods

Diagnostic Procedure

Without i-ELOOP

Step

Inspection

Action

1

INSPECT FUSE CONDITION

•  Is the fuse (ABS/DSCM 50A) normal?

Yes

Go to the next step.

No

•  If the fuse is blown:

―  Refer to the wiring diagram and verify whether or not there is a common connector between fuse and DSC HU/CM terminal B.

If there is a common connector:

•  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground.

•  Repair or replace the malfunctioning part.

If there is no common connector:

•  Repair or replace the wiring harness which has a short to ground.

•  Replace the fuse.

•  If the fuse is damaged:

―  Replace the fuse.

Go to Step5.

2

VERIFY PUMP MOTOR OPERATION

•  Using the M-MDS, perform the simulation inspection for pump motor.
(See SIMULATION INSPECTION [DSC HU/CM].)

•  Does the pump motor operate?

Yes

Go to Step5.

No

Go to the next step.

3

INSPECT PUMP MOTOR POWER SUPPLY CIRCUIT FOR OPEN OR SHORT TO GROUND CIRCUIT

•  Switch the ignition OFF.

•  Disconnect the DSC HU/CM connector.

•  Switch the ignition ON (engine off).

•  Measure the voltage between DSC HU/CM terminal B (wiring harness-side) and body ground.

•  Is the voltage 10 V or more?

Yes

Go to the next Step.

No

Refer to the wiring diagram and verify whether or not there is a common connector between battery and DSC HU/CM terminal B.

If there is a common connector:

•  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open or short circuit.

•  Repair or replace the malfunctioning part.

If there is no common connector:

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

Go to Step5.

4

INSPECT PUMP MOTOR GROUND CIRCUIT FOR OPEN CIRCUIT OR POOR GROUND

•  Switch the ignition OFF.

•  Disconnect the DSC HU/CM connector.

•  Measure the resistance between DSC HU/CM terminal AL (wiring harness-side) and body ground.

•  Is the resistance 0—1 ohm?

Yes

Go to the next step.

No

•  If the open circuit could be detected in the wiring harness:

―  Refer to the wiring diagram and verify whether or not there is a common connector between DSC HU/CM terminal AL and body ground.

If there is a common connector:

•  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit.

•  Repair or replace the malfunctioning part.

If there is no common connector:

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

―  Go to the next step.

•  If the resistance is out of specification:

―  Refer to the wiring diagram and verify whether or not there is a common connector between DSC HU/CM terminal AL and body ground.

If there is a common connector:

•  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a poor ground.

•  Repair or replace the malfunctioning part.

If there is no common connector:

•  Repair or replace the wiring harness which has a poor ground.

―  Go to the next step.

5

VERIFY DTC TROUBLESHOOTING COMPLETED

•  Reconnect all disconnected connectors.

•  Using the M-MDS, clear the DTC from the DSC HU/CM.
(See CLEARING DTC [DSC HU/CM].)

•  Using the M-MDS, perform the DSC HU/CM DTC inspection.
(See DTC INSPECTION [DSC HU/CM].)

•  Is the same DTC present?

Yes

Repeat the inspection from Step1.

If the malfunction recurs, replace the DSC HU/CM, then go to the next step.

(See DSC HU/CM REMOVAL/INSTALLATION [L.H.D.].)

(See DSC HU/CM REMOVAL/INSTALLATION [R.H.D.].)

No

Go to the next step.

6

VERIFY NO DTC IS PRESENT

•  Are any DTCs present?

Yes

Go to the applicable DTC inspection.

(See DTC TABLE [DSC HU/CM].)

No

DTC troubleshooting completed.

Step	Inspection	Action
1	INSPECT FUSE CONDITION • Is the fuse (ABS/DSCM 50A) normal?	Yes	Go to the next step.
No	• If the fuse is blown: ― Refer to the wiring diagram and verify whether or not there is a common connector between fuse and DSC HU/CM terminal B. If there is a common connector: • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has a short to ground. • Replace the fuse. • If the fuse is damaged: ― Replace the fuse. Go to Step5.
2	VERIFY PUMP MOTOR OPERATION • Using the M-MDS, perform the simulation inspection for pump motor. (See SIMULATION INSPECTION [DSC HU/CM].) • Does the pump motor operate?	Yes	Go to Step5.
No	Go to the next step.
3	INSPECT PUMP MOTOR POWER SUPPLY CIRCUIT FOR OPEN OR SHORT TO GROUND CIRCUIT • Switch the ignition OFF. • Disconnect the DSC HU/CM connector. • Switch the ignition ON (engine off). • Measure the voltage between DSC HU/CM terminal B (wiring harness-side) and body ground. • Is the voltage 10 V or more?	Yes	Go to the next Step.
No	Refer to the wiring diagram and verify whether or not there is a common connector between battery and DSC HU/CM terminal B. If there is a common connector: • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open or short circuit. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has an open or short circuit. Go to Step5.
4	INSPECT PUMP MOTOR GROUND CIRCUIT FOR OPEN CIRCUIT OR POOR GROUND • Switch the ignition OFF. • Disconnect the DSC HU/CM connector. • Measure the resistance between DSC HU/CM terminal AL (wiring harness-side) and body ground. • Is the resistance 0—1 ohm?	Yes	Go to the next step.
No	• If the open circuit could be detected in the wiring harness: ― Refer to the wiring diagram and verify whether or not there is a common connector between DSC HU/CM terminal AL and body ground. If there is a common connector: • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has an open circuit. ― Go to the next step. • If the resistance is out of specification: ― Refer to the wiring diagram and verify whether or not there is a common connector between DSC HU/CM terminal AL and body ground. If there is a common connector: • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a poor ground. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has a poor ground. ― Go to the next step.
5	VERIFY DTC TROUBLESHOOTING COMPLETED • Reconnect all disconnected connectors. • Using the M-MDS, clear the DTC from the DSC HU/CM. (See CLEARING DTC [DSC HU/CM].) • Using the M-MDS, perform the DSC HU/CM DTC inspection. (See DTC INSPECTION [DSC HU/CM].) • Is the same DTC present?	Yes	Repeat the inspection from Step1. If the malfunction recurs, replace the DSC HU/CM, then go to the next step. (See DSC HU/CM REMOVAL/INSTALLATION [L.H.D.].) (See DSC HU/CM REMOVAL/INSTALLATION [R.H.D.].)
No	Go to the next step.
6	VERIFY NO DTC IS PRESENT • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [DSC HU/CM].)
No	DTC troubleshooting completed.

With i-ELOOP

Step

Inspection

Action

1

INSPECT FUSE CONDITION

•  Is the fuse (ABS/DSCM 50A) normal?

Yes

Go to the next step.

No

•  If the fuse is blown:

―  Refer to the wiring diagram and verify whether or not there is a common connector between fuse and DSC HU/CM terminal B.

If there is a common connector:

•  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground.

•  Repair or replace the malfunctioning part.

If there is no common connector:

•  Repair or replace the wiring harness which has a short to ground.

•  Replace the fuse.

•  If the fuse is damaged:

―  Replace the fuse.

Go to Step5.

2

VERIFY PUMP MOTOR OPERATION

•  Using the M-MDS, perform the simulation inspection for pump motor.
(See SIMULATION INSPECTION [DSC HU/CM].)

•  Does the pump motor operate?

Yes

Go to Step5.

No

Go to the next step.

3

INSPECT PUMP MOTOR POWER SUPPLY CIRCUIT FOR OPEN OR SHORT TO GROUND CIRCUIT

•  Switch the ignition OFF.

•  Disconnect the DSC HU/CM connector.

•  Switch the ignition ON (engine off).

•  Measure the voltage between DSC HU/CM terminal B (wiring harness-side) and body ground.

•  Is the voltage 10 V or more?

Yes

Go to the next Step.

No

Refer to the wiring diagram and verify whether or not there is a common connector in the followings:

•  Battery—DC-DC converter terminal 3A

•  DC-DC converter terminal 4A—DSC HU/CM terminal B

If there is a common connector:

•  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open or short circuit.

•  Repair or replace the malfunctioning part.

If there is no common connector:

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

Go to Step5.

4

INSPECT PUMP MOTOR GROUND CIRCUIT FOR OPEN CIRCUIT OR POOR GROUND

•  Switch the ignition OFF.

•  Disconnect the DSC HU/CM connector.

•  Measure the resistance between DSC HU/CM terminal AL (wiring harness-side) and body ground.

•  Is the resistance 0—1 ohm?

Yes

Go to the next step.

No

•  If the open circuit could be detected in the wiring harness:

―  Refer to the wiring diagram and verify whether or not there is a common connector between DSC HU/CM terminal AL and body ground.

If there is a common connector:

•  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit.

•  Repair or replace the malfunctioning part.

If there is no common connector:

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

―  Go to the next step.

•  If the resistance is out of specification:

―  Refer to the wiring diagram and verify whether or not there is a common connector between DSC HU/CM terminal AL and body ground.

If there is a common connector:

•  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a poor ground.

•  Repair or replace the malfunctioning part.

If there is no common connector:

•  Repair or replace the wiring harness which has a poor ground.

―  Go to the next step.

5

VERIFY DTC TROUBLESHOOTING COMPLETED

•  Reconnect all disconnected connectors.

•  Using the M-MDS, clear the DTC from the DSC HU/CM.
(See CLEARING DTC [DSC HU/CM].)

•  Using the M-MDS, perform the DSC HU/CM DTC inspection.
(See DTC INSPECTION [DSC HU/CM].)

•  Is the same DTC present?

Yes

Repeat the inspection from Step1.

If the malfunction recurs, replace the DSC HU/CM, then go to the next step.

(See DSC HU/CM REMOVAL/INSTALLATION [L.H.D.].)

(See DSC HU/CM REMOVAL/INSTALLATION [R.H.D.].)

No

Go to the next step.

6

VERIFY NO DTC IS PRESENT

•  Are any DTCs present?

Yes

Go to the applicable DTC inspection.

(See DTC TABLE [DSC HU/CM].)

No

DTC troubleshooting completed.

DTC	C0020:01	Pump motor
	C0020:13
	C0020:16
	C0020:49
	C0020:71
	C0020:98
DETECTION CONDITION		• RR outlet solenoid valve malfunction is detected.
FAIL-SAFE FUNCTION		• Refer to “Fail-safe function table”. (See DTC TABLE [DSC HU/CM].)
POSSIBLE CAUSE		Without i-ELOOP • Fuse (ABS/DSCM 50A) malfunction • Open or short circuit in wiring harness between battery and DSC HU/CM terminal B • Open circuit in wiring harness between DSC HU/CM terminal AL and body ground • Poor connection at each connector • Pump motor malfunction • Pump motor is driven for long periods With i-ELOOP • Fuse (ABS/DSCM 50A) malfunction • Short or open circuit in wiring harness between battery and DC-DC converter terminal 3A • Open or short circuit in wiring harness between DC-DC converter terminal 4A and DSC HU/CM terminal B • Open circuit in wiring harness between DSC HU/CM terminal AL and body ground • Poor connection at each connector • Pump motor malfunction • Pump motor is driven for long periods