C0020:71
Anti-Lock Control - Hybrid
Pinpoint Test J: DTCs C0020:13 and 71
Refer to Wiring Diagram Set 42, Vehicle Dynamic Systems for schematic and connector information Electrical Diagrams.
Normal Operation
The ABS module uses an internal solid state switch to operate the ABS pump motor. When the engine speed is above 700 rpm or the vehicle speed is at approximately 7 km/h (4 mph), the ABS module tests the ABS pump motor by activating it for 30 milliseconds. While the pump motor is being activated, the ABS module monitors the voltage drop across the ABS pump motor solid state switch and the amount of current the ABS pump motor draws through the solid state switch. If the voltage drop is too high or if the ABS pump motor is drawing too much current, the ABS module sets a DTC. After 30 milliseconds have passed, the ABS module stops applying voltage to the pump motor and observe the voltage that the spinning ABS pump motor is generating. The voltage generated by the motor indicates how fast the motor is spinning. A voltage that is too low indicates that the motor is not spinning freely and a DTC sets.
Fused battery voltage from Battery Junction Box (BJB) fuse 9 (50A) along circuit SBB09 (RD) is used by the ABS module to power the ABS pump motor. The ABS module provides ground for the ABS pump motor from GD120 (BK/GN). Insufficient power or ground along from these circuits causes multiple DTCs to set.
- DTC C0020:13 (ABS Pump Motor Control: Circuit Open)- If the voltage supplied to the ABS module is less than 10 volts, if there is an open or high resistance on the ABS pump motor circuit between the ABS module and the Hydraulic Control Unit (HCU), or if the ABS module is faulted internally, this DTC sets.
- DTC C0020:71 (ABS Pump Motor Control: Circuit Actuator Stuck)- If the ABS module detects that the ABS pump motor is not rotating, when it is commanded to run, this DTC sets.
This pinpoint test is intended to diagnose the following:
- Fuse(s)
- Wiring, terminals or connectors
- HCU (Hydraulic Control Unit)
- ABS module
PINPOINT TEST J : DTCs C0020:13 AND 71
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
J1 VERIFY ALL WIRING CONNECTIONS
- Ignition OFF.
- Disconnect: ABS Module C155.
- Using a good light source, inspect each connector terminal for any corrosion.
- Inspect both connectors for any pushed-out pins.
Refer to Wiring Diagram Set 5 for schematic and connector information Electrical Diagrams.
- Using a suitable mating terminal, check each female terminal for deformed or enlarged contacts by comparing the mating terminal's fit between each of the following pins:
- C155-1
- C155-16
- Refer to Wiring Diagram Set 5 for schematic and connector information Electrical Diagrams.
Is each terminal free of corrosion, pushed-out pins or spread terminals?
Yes
GO to J2.
No
REPAIR the affected terminal(s). CLEAR the DTCs. REPEAT the self-test.
J2 CHECK THE PUMP MOTOR (PMP_MTR) ACTIVE COMMAND
- Connect: ABS Module C135.
- Connect the scan tool.
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: DataLogger- ABS Module.
- Toggle the PMP_MTR active command ON.
Does the ABS pump motor run for approximately 2 seconds?
Yes
TOGGLE the PMP_MTR active command OFF. CLEAR the DTCs. DRIVE the vehicle at speeds greater than 20 km/h (12 mph). RETRIEVE the DTCs. If DTC C0020:13 or 71 is retrieved, GO to J5. For all other ABS module DTCs, GO to the ABS Module DTC Chart Anti-Lock Control.
No
TOGGLE the ABS module pump motor OFF active command. GO to J3.
J3 CHECK THE PUMP MOTOR VOLTAGE SUPPLY TO THE ABS MODULE
- Ignition OFF.
- Disconnect: ABS Module C155.
- Ignition ON.
- Measure the voltage between ABS module C155-1, circuit SBB09 (RD), harness side and ground.
Is the voltage greater than 10 volts?
Yes
GO to J4.
No
VERIFY that BJB (Battery Junction Box) fuse 9 (50A) is OK. If OK, REPAIR circuit SBB09 (RD). If the fuse is not OK, REFER to the Wiring Diagrams to identify the cause of the circuit short Electrical Diagrams. CLEAR the DTCs and REPEAT the self-test.
J4 CHECK THE ABS MODULE GROUND CIRCUIT FOR AN OPEN
- Ignition OFF.
- Measure the resistance between ABS module C155-16, circuit GD120 (BK/GN), harness side and ground.
Is the resistance less than 5 ohms?
Yes
GO to J5.
No
REPAIR circuit GD120 (BK/GN). CLEAR the DTCs. REPEAT the self-test.
J5 CHECK FOR CORRECT ABS MODULE OPERATION
- Disconnect: ABS Module C155 (if not previously disconnected).
- Check ABS module C135 for:
- corrosion.
- pushed-out pins.
- spread terminals.
- Connect: ABS Module C155.
- Make sure the connector is seated correctly, then operate the system and verify the concern is still present.
Is the concern still present?
Yes
INSTALL a new ABS module. REFER to Anti-Lock Brake System (ABS) Module . TEST the system for normal operation. CLEAR the DTCs. DRIVE the vehicle at speeds greater than 20 km/h (12 mph). REPEAT the self-test. If DTC C0020:13 or 71 returns, INSTALL a new HCU (Hydraulic Control Unit). REFER to Hydraulic Control Unit (HCU) - Hybrid .
No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.