Pinpoint Test J: DTCs C1095 and C1096
Anti-Lock Control - Traction Control and Stability Assist
Pinpoint Tests
Pinpoint Test J: DTCs C1095 and C1096
Refer to Wiring Diagram Set 42, Vehicle Dynamic Systems for schematic and connector information Diagrams By Number.
Normal Operation
Fused battery voltage for hydraulic pump motor operation is supplied to the ABS module by BJB fuse 33 (40A) along circuit SBB33 (RD). Ground is provided to the ABS module along circuit GD121 (BK/YE).
When the ignition key is turned to the ON position, the ABS module commands the Hydraulic Control Unit (HCU) pump on for 100 ms (±6 ms) and is then commanded off. After 6 ms, the ABS module will read the voltage that is being generated by the HCU pump. If the voltage indicates the motor is spinning at less than 500 rpm, there may be a locked motor. If this condition is detected 4 times, DTC C1095 is set. The pump motor is checked for an open circuit 2 seconds after the most recent successful pump motor off command. If the pump motor feedback remains greater than 0.75 volt for more than 50 ms (±6 ms) after these conditions have been met, DTC C1096 is set.
- DTC C1095 (ABS Hydraulic Pump Motor Circuit Failure) - If a short to voltage or ground is detected, if a locked up pump motor is detected or if there is an internal failure of the ABS module, DTC C1095 will be set.
- DTC C1096 (ABS Hydraulic Pump Motor Circuit Open) - If a short to voltage, a short to ground or an open is detected, if a locked up pump motor is detected or if there is an internal failure of the ABS module, DTC C1096 will be set.
This pinpoint test is intended to diagnose the following:
- Fuse
- Wiring, terminals or connectors
- Hydraulic pump motor
- ABS module
PINPOINT TEST J: DTCs C1095 AND C1096
NOTICE: Use the Flex Probe Kit for all test connections to prevent damage to the wiring terminals. Do not use standard multi-meter probes.
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J1 CHECK THE ABS PUMP MOTOR
- Ignition ON.
- Is the ABS pump motor running all the time?
Yes
INSTALL a new ABS module and HCU. REFER to Anti-Lock Brake System (ABS) Module Service and Repair and Hydraulic Control Unit (HCU) Service and Repair. Using the scan tool, CARRY OUT the IVD Initialization sequence. CLEAR the DTCs. REPEAT the self-test.
No
GO to J2.
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J2 CHECK FOR ABS MODULE DTCs
- Connect the scan tool.
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: Self Test - Clear All CMDTCs.
- Enter the following diagnostic mode on the scan tool: Self Test - ABS Module.
- Retrieve and record all ABS module DTCs.
- Does DTC C1095 or C1096 return?
Yes
If DTC C1095 is retrieved, GO to J4.
If DTC C1096 is retrieved, INSTALL a new ABS module. REFER to Anti-Lock Brake System (ABS) Module Service and Repair. Using the scan tool, CARRY OUT the IVD Initialization sequence. CLEAR the DTCs. CARRY OUT the self-test with the brake pedal not applied.
If DTC C1096 returns, INSTALL a new HCU. REFER to Hydraulic Control Unit (HCU) Service and Repair.
No
GO to J3.
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J3 CHECK FOR RETURNING ABS MODULE DTCs
- Test drive the vehicle at speeds greater than 32 km/h (20 mph) and carry out at least one ABS stop.
- Connect the scan tool.
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: Self Test - ABS Module .
- Retrieve and record the ABS module DTCs.
- Are any DTCs present?
Yes
If DTC C1096 is retrieved, GO to J6.
If DTC C1095 is retrieved, INSTALL a new HCU. REFER to Hydraulic Control Unit (HCU) Service and Repair. CLEAR the DTCs. REPEAT the self-test.
For all other ABS module DTCs, GO to the ABS Module DTC Chart. Anti-Lock Control - Traction Control and Stability Assist
No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. CARRY OUT the self-test with the brake pedal not applied.
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J4 CHECK THE VOLTAGE TO THE ABS MODULE
- Ignition OFF.
- Disconnect: ABS Module C155.
- Ignition ON.
- Measure the voltage between ABS module C155-31, circuit SBB33 (RD), harness side and ground.
- Is the voltage greater than 10 volts?
Yes
GO to J5.
No
VERIFY BJB fuse 33 (40A) is OK. If OK, REPAIR SBB33 (RD). If not OK, REFER to the Wiring Diagrams to identify possible causes of the circuit short Diagrams By Number. CLEAR the DTCs.
REPEAT the self-test.
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J5 CHECK THE ABS MODULE GROUND CIRCUITS FOR AN OPEN
- Ignition OFF.
- Measure the resistance between ground and:
- ABS module C155-16, circuit GD121 (BK/YE), harness side.
- ABS module C155-45, circuit GD121 (BK/YE), harness side.
- Are the resistances less than 5 ohms?
Yes
GO to J6.
No
REPAIR circuit GD121 (BK/YE). CLEAR the DTCs. REPEAT the self-test.
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J6 CHECK FOR CORRECT ABS MODULE OPERATION
- Check ABS module C155 for:
- corrosion.
- pushed-out pins.
- spread terminals.
- Connect: ABS Module C155.
- Make sure the connector is fully seated and locked, 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 Service and Repair. Using the scan tool, CARRY OUT the IVD Initialization sequence. CLEAR the DTCs. CARRY OUT the self-test with the brake pedal not applied.
No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector or a malfunctioning charging system. CLEAR the DTCs. CARRY OUT the self-test with the brake pedal not applied.
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