DTC C0020:01/C0020:1C/C0020:71 [ABS]

id0402a7877000

DTC

C0020:01, C0020:1C, C0020:71

Pump motor, motor relay

DETECTION CONDITION

•  C0020:01

―  ABS motor relay signal does not correspond to ABS HU/CM ON signal.

•  C0020:1C

―  ABS motor monitor signal does not correspond to ABS HU/CM OFF signal.

―  ABS motor monitor signal does not correspond to ABS HU/CM ON signal.

•  C0020:71

―  ABS HU/CM motor monitor ON signal is not input within specified time limit or more when motor signal is switched from ON to OFF by ABS HU/CM.

POSSIBLE CAUSE

•  ABS 40A fuse malfunction

•  Open or short circuit in ABS HU/CM internal motor relay, or stuck motor relay

•  Open or short circuit in ABS HU/CM internal pump motor, or frozen pump motor

•  Open circuit or short to ground in the wiring harness between the battery and ABS HU/CM terminal Y

•  Open circuit in the wiring harness between ABS HU/CM terminal B and body ground

•  Poor connection at connectors (female terminal)

Diagnostic procedure

STEP	INSPECTION		ACTION
1	INSPECT ABS FUSE CONDITION • Is the ABS fuse (ABS 40A) normal?	Yes	Go to the next step.
1		No	Replace the fuse, then go to Step 6.
2	VERIFY PUMP MOTOR OPERATION • Switch the ignition to off. • Connect the M-MDS to the DLC-2. • Switch the ignition to ON. • Access PMP_MTR active command modes using the M-MDS. • Does the pump motor operate?	Yes	Go to Step 6.
2		No	Go to the next step.
3	INSPECT MOTOR RELAY POWER SUPPLY FOR OPEN CIRCUIT • Switch the ignition to off. • Disconnect the ABS HU/CM connector. • Inspect for continuity between ABS HU/CM terminal Y and the positive battery terminal. • Is there continuity?	Yes	Go to the next step.
3		No	Repair or replace the wiring harness, then go to Step 6.
4	INSPECT MOTOR RELAY POWER SUPPLY FOR SHORT CIRCUIT • Inspect for continuity between ABS HU/CM terminal Y and body ground. • Is there continuity?	Yes	Repair or replace the wiring harness, then go to Step 6.
4		No	Go to the next step.
5	INSPECT PUMP MOTOR GROUND FOR OPEN CIRCUIT • Inspect for continuity between ABS HU/CM terminal B and body ground. • Is there continuity?	Yes	Go to the next step.
5		No	Repair or replace the wiring harness, then go to the next step.
6	VERIFY THAT THE SAME DTC IS NOT PRESENT • Reconnect all disconnected connectors. • Clear the DTCs from the memory. (See \nON-BOARD DIAGNOSIS [ABS].) • Start the engine and drive the vehicle at 10 km/h {6.2 mph} or more. • Are the same DTCs present?	Yes	Repeat the inspection from Step 1. If the malfunction recurs, replace the ABS CM, then go to the next step. (See \nABS HU/CM REMOVAL/INSTALLATION.)
6		No	Go to the next step.
7	VERIFY THAT NO OTHER DTCS ARE PRESENT • Are any other DTCs output?	Yes	Go to the applicable DTC inspection. (See \nON-BOARD DIAGNOSIS [ABS].)
7		No	DTC troubleshooting completed.

DTC	C0020:01, C0020:1C, C0020:71		Pump motor, motor relay
DETECTION CONDITION		• C0020:01 ― ABS motor relay signal does not correspond to ABS HU/CM ON signal. • C0020:1C ― ABS motor monitor signal does not correspond to ABS HU/CM OFF signal. ― ABS motor monitor signal does not correspond to ABS HU/CM ON signal. • C0020:71 ― ABS HU/CM motor monitor ON signal is not input within specified time limit or more when motor signal is switched from ON to OFF by ABS HU/CM.
POSSIBLE CAUSE		• ABS 40A fuse malfunction • Open or short circuit in ABS HU/CM internal motor relay, or stuck motor relay • Open or short circuit in ABS HU/CM internal pump motor, or frozen pump motor • Open circuit or short to ground in the wiring harness between the battery and ABS HU/CM terminal Y • Open circuit in the wiring harness between ABS HU/CM terminal B and body ground • Poor connection at connectors (female terminal)