Brake System Control Module Outputs
Vacuum pump control circuits are used to activate and control the electric vacuum pump to provide the required amount of vacuum to the ACU. Diagnostics on these control circuits include general electrical faults such as short to ground or open circuit (general electrical fault).
VACUUM PUMP CONTROL CIRCUITS CHECK OPERATION
| DTCs | P258B, P258A, P25EE |
| Monitor Execution | Continuous |
| Monitor Sequence | None |
| Monitoring Duration | 100 msec |
VACUUM PUMP CONTROL CIRCUIT A RANGE/PERFORMANCE (P258B) ENTRY CONDITIONS
| Entry Conditions | Minimum | Maximum |
| Ignition State | On |
VACUUM PUMP CONTROL CIRCUIT A RANGE/PERFORMANCE (P258B) CHECK MALFUNCTION THRESHOLDS
| Vacuum pump monitoring line voltage out of range with relay commanded open, outside of 1.3V to 5.0V, or if monitoring line voltage is < 250mV with relay commanded closed for 1 sec. |
VACUUM PUMP CONTROL CIRCUIT A OPEN (P258A) ENTRY CONDITIONS
| Entry Conditions | Minimum | Maximum |
| Ignitions State | On | |
| Vacuum Pump Relay Line State | Open |
VACUUM PUMP CONTROL CIRCUIT A OPEN (P258A) CHECK MALFUNCTION THRESHOLDS
| Vacuum pump monitoring line voltage out of range with relay commanded open, outside of 1.3V to 5.0V for 100msec. |
VACUUM PUMP CONTROL CIRCUIT B OPEN (P25EE) ENTRY CONDITIONS
| Entry Conditions | Minimum | Maximum |
| Ignitions State | On | |
| Vacuum Pump Relay Line State | Closed |
VACUUM PUMP CONTROL CIRCUIT B OPEN (P25EE) CHECK MALFUNCTION THRESHOLDS
| Vacuum pump monitoring line voltage < 250mV for 1 second. |
ABS Pump Motor Control Circuits are used to diagnose the function of the electric pump-motor that provides hydraulic pressure to the brake system in certain operation modes (ABS, Traction Control), as well as certain failure modes (loss of vacuum pump, or loss of vacuum). These diagnostics include general circuit checks such as short to ground/battery, circuit open, actuator stuck (motor stuck)
ABS PUMP MOTOR CONTROL CIRCUIT CHECK OPERATION
| DTCs | C052E, C052D, C052C, C052B |
| Monitor Execution | Continuous |
| Monitor Sequence | None |
| Monitoring Duration | 100 msec |
ABS PUMP MOTOR CONTROL CIRCUIT SHORT TO GROUND (C052E) ENTRY CONDITIONS
| Entry Conditions | Minimum | Maximum |
| Motor Commanded On time | 1ms | |
| Other DTC's Set concurrently | C0021, OR C0566, OR C0567, OR C0568, OR C0569 | - |
ABS PUMP MOTOR CONTROL CIRCUIT SHORT TO GROUND (C052E) CHECK MALFUNCTION THRESHOLDS
| Voltage drop across solid state pump switch is > 0.4V, measured 3 times after a motor reset. Motor reset will occur if voltage drop persists for 220 ms. |
ABS PUMP MOTOR CONTROL CIRCUIT HIGH (C052D) ENTRY CONDITIONS
| Entry Conditions | Minimum | Maximum |
| Time elapsed since module powerup | > 1.8 sec | |
| Motor Commanded Off time | 1ms | |
| Other DTC's Set concurrently | C0021, OR C0566, OR C0567, OR C0568, OR C0569 | |
| No overvoltage or undervoltage faults set (C0564, C0565) |
ABS PUMP MOTOR CONTROL CIRCUIT HIGH (C052D) CHECK MALFUNCTION THRESHOLDS
| Voltage at pump motor too high when the pump motor is deactivated (> 0.93 V) for 3 seconds. |
ABS PUMP MOTOR CONTROL CIRCUIT OPEN (C052C) ENTRY CONDITIONS
| Entry Conditions | Minimum | Maximum |
| Battery Voltage Applied | > 9 Volts | |
| Motor Commanded Off/On Time | 1ms | |
| Other DTC's Set Concurrently | C0021, OR C0566, OR C0567, OR C0568, OR C0569 |
ABS PUMP MOTOR CONTROL RANGE/PERFORMANCE (C052B) CHECK MALFUNCTION THRESHOLDS
| Voltage is outside of expected range when pump motor is on or off. If pump motor is off, voltage below 6 V for 1.8 sec will trigger fault, if pump motor is ON, voltage below 7.3V for 1.8 sec will trigger. |
ABS PUMP MOTOR CONTROL RANGE/PERFORMANCE (C052B) ENTRY CONDITIONS
| Entry Conditions | Minimum | Maximum |
| Ignition State | On | |
| Other DTC's Set concurrently | C0021, OR C0566, OR C0567, OR C0568, OR C0569 |
ABS PUMP MOTOR CONTROL CIRCUIT OPEN (C052C) CHECK MALFUNCTION THRESHOLDS
| Voltage at pump after the end of a pump motor activation < 930mV for 1.8 sec. |
Brake Booster Solenoid -The diagnostics for this solenoid include general circuit faults such as short to ground/power and open circuit detections, as well as a range/performance diagnostic.
BRAKE BOOSTER SOLENOID CHECK OPERATION
| DTCs | C0569, C0567, C0568 |
| Monitor Execution | Continuous |
| Monitor Sequence | None |
| Monitoring Duration | 100 msec |
BRAKE BOOSTER SOLENOID CIRCUIT PERFORMANCE (C0569) ENTRY CONDITIONS
| Entry Conditions | Minimum | Maximum |
| Ignition state | On | |
| Brake Booster State | Not Commanded | |
| Booster low side driver state | Commanded on for > 2msec | |
| Other DTC's Set concurrently | C052E, OR C052D, OR C052C, or C052B - ABS pump motor faults |
BRAKE BOOSTER SOLENOID CIRCUIT PERFORMANCE (C0569) CHECK MALFUNCTION THRESHOLDS
| Voltage drop across low side of solenoid > 2 volts with high side driver commanded off for 80 msec. |
| Booster current with test pulse < 160mA with high side driver commanded ON for 80msec. |
| Supply voltage < 3.0V with high side driver state commanded ON for 80 msec |
BRAKE BOOSTER SOLENOID CIRCUIT LOW (C0567) ENTRY CONDITIONS
| Entry Conditions | Minimum | Maximum |
| Ignition State | On | |
| Booster high-side driver state | Commanded OFF | |
| Booster low-side driver state | Commanded OFF | |
| Other DTC's Set concurrently | C052E, OR C052D, OR C052C, or C052B - ABS pump motor faults |
BRAKE BOOSTER SOLENOID CIRCUIT LOW (C0567) CHECK MALFUNCTION THRESHOLDS
| Supply voltage < 3.0V for 380 msec |
BRAKE BOOSTER SOLENOID CIRCUIT HIGH (C0568) ENTRY CONDITIONS
| Entry Conditions | Minimum | Maximum |
| Booster high-side driver state | Commanded OFF | |
| Booster low-side driver state | Commanded OFF | |
| Other DTC's Set concurrently | C052E, OR C052D, OR C052C, OR C052B - ABS pump motor faults |
BRAKE BOOSTER SOLENOID CIRCUIT HIGH (C0568) CHECK MALFUNCTION THRESHOLDS
| Supply voltage > 3.0V for 80 msec |
Traction Control System Valves - are used to control the application of high pressure fluid to each wheel, and are used during traction control events, including ABS.
TRACTION CONTROL SYSTEM CONTROL CHANNEL A/B VALVE 1/2 CHECK OPERATION
| DTCs | C0001, C0002, C0003, C0004 |
| Monitor Execution | Continuous |
| Monitor Sequence | None |
| Monitoring Duration | 100 msec |
TRACTION CONTROL SYSTEM CONTROL CHANNEL A/B VALVE 1/2 ENTRY CONDITIONS
| Entry Conditions | Minimum | Maximum |
| Ignition State | On | |
| Other DTC's Set concurrently | C0021, OR C0566, OR C0567, OR C0568, OR C0569 |
TRACTION CONTROL SYSTEM CONTROL CHANNEL A/B VALVE 1/2 CHECK MALFUNCTION THRESHOLDS
| The ECU will provide a passive test pulse while the valve is not actuated by the control system. The ECU then checks the voltage drop across the low side driver during the valve actuation. If that voltage drop is less than 2.0V for 80msec, fault is detected. |