Menu +
Generic selectors
Exact matches only
Search in title
Search in content
Post Type Selectors

DTC C0020:11, C0020:12, C0020:13, C0020:49 OR C0020:71 [DSC HU/CM]

DTC C0020:11, C0020:12, C0020:13, C0020:49 OR C0020:71 [DSC HU/CM]

SM2335026

id040262003300



Outline

System malfunction location

Pump motor, pump relay
Detection condition
• C0020:11
― The motor relay signal does not correspond to the DSC HU/CM ON signal.
• C0020:12
― The motor monitor signal does not correspond to the DSC HU/CM OFF signal.
• C0020:13
― A condition is detected in which the motor relay voltage is less than the specification while the DSC HU/CM controls the pump relay at on.
• C0020:49
― The DSC HU/CM detects a pump motor drive circuit malfunction.
• C0020:71
― The DSC HU/CM detects a voltage decrease occurring in the pump motor after the pump motor operates.
Fail-safe
Refer to “DTC Table” and “Fail-safe Function Malfunction Contents Table”. (See DTC TABLE [DSC HU/CM (US)].)
Possible cause
• DSC HU/CM connector or terminals malfunction
• Short to ground or open circuit in DSC HU/CM power supply circuit
• Open circuit in DSC HU/CM ground circuit
• DSC HU/CM malfunction
― Pump motor stuck, open circuit, short circuit to ground, or short circuit to power supply
― Motor relay stuck, open circuit, short circuit to ground, or short circuit to power supply



Diagnostic Procedure

Step

Inspection

Results

Action
1
VERIFY PUMP MOTOR OPERATION
• Verify if the pump motor operates using the simulation item TCS_PUMP_MOTOR. (See SIMULATION INSPECTION.) (See SIMULATION TABLE [DSC HU/CM].)
• Does the pump motor operate?
Yes
Perform the repair completion verification.
No
Go to the next step.
2
INSPECT DSC HU/CM 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.
3
INSPECT DSC HU/CM POWER SUPPLY CIRCUIT FOR SHORT TO GROUND AND OPEN CIRCUIT
• Inspect the power supply circuit for an open circuit and 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.
4
INSPECT DSC HU/CM POWER SUPPLY 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.
5
INSPECT DSC HU/CM GROUND 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.
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.)
• Start the engine and drive the vehicle at 10 km/h {6.2 mph} or more.
• Perform the DTC inspection for the DSC HU/CM. (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 [(US)].)
If the CAN communication is normal, perform the diagnosis from Step 1.
• If the malfunction recurs, replace the DSC HU/CM, then go to the next step. (See DSC HU/CM REMOVAL/INSTALLATION [L.H.D. (US)].)
No
Go to the next step.
Repair completion verification 2
VERIFY IF OTHER DTCs DISPLAYED
• Perform the DTC inspection. (See DTC INSPECTION.)
• Are any DTCs displayed?
Yes
Repair the malfunctioning location according to the applicable DTC troubleshooting.
No
DTC troubleshooting completed.