Pinpoint Test W: DTC C101A:1C, 62, 64 or C101B:1C
Anti-Lock Control - Hybrid
Pinpoint Test W: DTC C101A:1C, 62, 64 or C101B:1C
Refer to Wiring Diagram Set 42 (Fusion/Milan/MKZ, Fusion Hybrid, Milan Hybrid, MKZ Hybrid), Vehicle Dynamic Systems for schematic and connector information. Diagrams By Number
Normal Operation
The vacuum pressure sensor produces 2 signals used by the ABS module to check the integrity of the vacuum lines, hoses and fittings, and to measure the performance of the brake vacuum pump and brake booster. The ABS module provides a 5-volt reference voltage to the vacuum pressure sensor. The ABS module provides a signal return to the vacuum pressure sensor along circuit.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Vacuum pressure sensor
- ABS module
PINPOINT TEST W: C101A:1C, 62, 64 or C101B:1C
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
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W1 VERIFY ALL WIRING CONNECTIONS
- Ignition OFF.
- Disconnect: Vacuum Sensor C1603 .
- Disconnect: ABS Module C135 .
- 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 (Fusion/Milan/MKZ, Fusion Hybrid, Milan Hybrid, MKZ Hybrid) for schematic and connector information. Diagrams By Number
- 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:
- C135-6
- C135-25
- C135-28
- C135-30
- C1603-1
- C1603-2
- C1603-3
- C1603-4
- Refer to Wiring Diagram Set 5 (Fusion/Milan/MKZ, Fusion Hybrid, Milan Hybrid, MKZ Hybrid) for schematic and connector information. Diagrams By Number
- Is each terminal free of corrosion, pushed-out pins or spread terminals?
Yes
GO to W2.
No
REPAIR the affected terminal(s). CLEAR the DTCs. REPEAT the self-test.
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W2 CHECK THE DTCs FROM THE ABS MODULE SELF-TEST
- Review the DTCs recorded during Inspection and Verification.
- Are both DTCs C101A:1C and C101B:1C present?
Yes
GO to W9.
No
If DTC C101A:1C is present without DTC C101B:1C, GO to W3.
If DTC C101B:1C is present without DTC C101A:1C, GO to W6.
If DTC C101A:64 is present, GO to W13.
If only DTC C101A:62 is present, GO to W11.
For all other DTCs, GO to the ABS Module DTC Chart. ABS Module DTC Chart
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W3 CHECK THE SENSOR SIGNAL 1 RETURN CIRCUIT FOR A SHORT TO GROUND
- Measure the resistance between vacuum sensor C1603-4, circuit VCA38 (BN/VT), harness side and ground.
- Is the resistance greater than 10,000 ohms?
Yes
GO to W4.
No
REPAIR circuit VCA38 (BN/VT). CLEAR the DTCs. REPEAT the self-test.
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W4 CHECK THE SENSOR SIGNAL 1 RETURN CIRCUIT FOR A SHORT TO VOLTAGE
- Ignition ON.
- Measure the voltage between vacuum sensor C1603-4, circuit VCA38 (BN/VT), harness side and ground.
- Is any voltage present?
Yes
REPAIR circuit VCA38 (BN/VT). CLEAR the DTCs. REPEAT the self-test.
No
GO to W5.
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W5 CHECK THE SENSOR SIGNAL 1 RETURN CIRCUIT FOR AN OPEN
- Ignition OFF.
- Measure the resistance between vacuum sensor C1603-4, circuit VCA38 (BN/VT), harness side and ABS module C135-30, circuit VCA38 (BN/VT), harness side.
- Is the resistance less than 5 ohms?
Yes
GO to W9.
No
REPAIR circuit VCA38 (BN/VT). CLEAR the DTCs. REPEAT the self-test.
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W6 CHECK THE SENSOR SIGNAL 2 RETURN CIRCUIT FOR A SHORT TO GROUND
- Measure the resistance between vacuum sensor C1603-1, circuit VCA39 (BU/GN), harness side and ground.
- Is the resistance greater than 10,000 ohms?
Yes
GO to W7.
No
REPAIR circuit VCA39 (BU/GN). CLEAR the DTCs. REPEAT the self-test.
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W7 CHECK THE SENSOR SIGNAL 2 RETURN CIRCUIT FOR A SHORT TO VOLTAGE
- Ignition ON.
- Measure the voltage between vacuum sensor C1603-1, circuit VCA39 (BU/GN), harness side and ground.
- Is any voltage present?
Yes
REPAIR circuit VCA39 (BU/GN). CLEAR the DTCs. REPEAT the self-test.
No
GO to W8.
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W8 CHECK THE SENSOR SIGNAL 2 RETURN CIRCUIT FOR AN OPEN
- Ignition OFF.
- Measure the resistance between vacuum sensor C1603-1, circuit VCA39 (BU/GN), harness side and ABS module C135-25, circuit VCA39 (BU/GN), harness side.
- Is the resistance less than 5 ohms?
Yes
GO to W9.
No
REPAIR circuit VCA39 (BU/GN). CLEAR the DTCs. REPEAT the self-test.
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W9 CHECK THE SENSOR VOLTAGE SUPPLY CIRCUIT FOR A SHORT TO GROUND
- Measure the resistance between vacuum sensor C1603-3, circuit LCA37 (YE/OG), harness side and ground.
- Is the resistance greater than 10,000 ohms?
Yes
GO to W10.
No
REPAIR circuit LCA37 (YE/OG). CLEAR the DTCs. REPEAT the self-test.
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W10 CHECK THE SENSOR VOLTAGE SUPPLY AND GROUND CIRCUITS FOR A SHORT TO VOLTAGE
- Ignition ON.
- Measure the voltage between ground and:
- C1603-3, circuit LCA37 (YE/OG), harness side.
- C1603-2, circuit RCA37 (WH/BU), harness side.
- Is any voltage present?
Yes
REPAIR the affected circuit(s). CLEAR the DTCs. REPEAT the self-test.
No
GO to W11.
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W11 CHECK THE SENSOR VOLTAGE SUPPLY AND GROUND CIRCUITS FOR AN OPEN
- Ignition OFF.
- Measure the resistance between ABS module C135, harness side and vacuum sensor C1603, harness side as indicated in the following chart:
- Are the resistances less than 5 ohms?
Yes
If only DTC C101A:62 is present, GO to W12.
For all other DTCs, GO to W13.
No
REPAIR the affected circuit(s). CLEAR the DTCs. REPEAT the self-test.
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W12 CHECK BOTH SENSOR SIGNAL RETURN CIRCUITS FOR AN OPEN
- Measure the resistance between ABS module C135, harness side and vacuum sensor C1603, harness side as indicated in the following chart:
- Are the resistances less than 5 ohms?
Yes
GO to W13.
No
REPAIR the affected circuit(s). CLEAR the DTCs. REPEAT the self-test.
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W13 CHECK BOTH SENSOR SIGNAL RETURN CIRCUITS FOR A SHORT TOGETHER
- Measure the resistance between vacuum sensor C1603-1, circuit VCA39 (BU/GN), harness side and ABS module C1603-4, circuit VCA38 (BN/VT), harness side.
- Is the resistance greater than 10,000 ohms?
Yes
GO to W14.
No
REPAIR the affected circuit(s). CLEAR the DTCs. REPEAT the self-test.
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W14 CHECK ABS MODULE OUTPUT
- Connect: ABS Module C135 .
- Ignition ON.
- Measure the voltage between vacuum sensor C1603-3, circuit LCA37 (YE/OG) and ground.
- Is the voltage between 4.7 and 5.1 volts?
Yes
INSTALL a new vacuum sensor. REFER to Power Brake Actuation Service and Repair. CLEAR the DTCs. REPEAT the self-test.
No
INSTALL a new ABS module. REFER to Anti-Lock Brake System (ABS) Module - Hybrid Service and Repair. REPEAT the self-test.
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