C2111

C2111-SENSOR SUPPLY VOLTAGE CIRCUIT LOW








When Monitored:

With the ignition on

Set Condition:

When the Anti-Lock Brake Module indicates that the Brake Pressure Sensor Signal is within the low fault area





Diagnostic Test

1. CHECK FOR A DTC C2111-SENSOR SUPPLY VOLTAGE CIRCUIT LOW





NOTE: This DTC must be active for the results of this test to be valid.

Turn the ignition on.
With the scan tool read and record DTC's.
With the scan tool read and record Freeze Fame information.
With the scan tool erase DTC's.
Cycle the ignition from off to on.
With the scan tool read and record DTC's.

Does the scan tool display: C2111-SENSOR SUPPLY VOLTAGE CIRCUIT LOW?

Yes

- Go To 2

No

- Refer to the INTERMITTENT CONDITION diagnostic procedure. Testing and Inspection
- Perform ABS VERIFICATION TEST - VER 1. ABS Verification Test.

2. CHECK THE TERMINALS/CONNECTORS/WIRING HARNESS FOR DAMAGE





Check all related wiring for bruised chafed pierced or partially broken wires.
Check all related connectors for broken bent pushed out or corroded terminals.

Were any problems found?

Yes

- Repair as necessary
- Perform ABS VERIFICATION TEST VER 1. ABS Verification Test.

No

- Go To 3

3. CHECK THE VOLTAGE ON THE (B83) BRAKE PRESSURE SENSOR SUPPLY CIRCUIT





Turn the ignition off.
Disconnect the Brake Pressure Sensor harness connector.
Turn the ignition on.
Measure the voltage of the (B83) Brake Pressure Sensor Supply curcuit.

Is the voltage above 4 volts?

Yes

- Go To 7

No

- Go To 4

4. CHECK FOR A SHORT BETWEEN THE (B83) BRAKE PRESSURE SENSOR SUPPLY CIRCUIT AND THE (B84) BRAKE PRESSURE SENSOR SIGNAL CIRCUIT





Turn the ignition off.
Disconnect the Anti-Lock Brake Module harness connector.
Disconnect the Brake Pressure Sensor harness connector.
Measure the resistance between the (B83) Brake Pressure Sensor Supply and the (B84) Brake Pressure Sensor Signal circuit.

Is the resistance below 150 ohms?

Yes

- Repair the (B83) Brake Pressure Sensor Supply and (B84) Brake Pressure Sensor Signal circuits for a short together.
- Perform ABS VERIFICATION TEST VER 1. ABS Verification Test.

No

- Go To 5

5. CHECK FOR A SHORT BETWEEN THE (B83) BRAKE PRESSURE SENSOR SUPPLY CIRCUIT AND THE (B984) BRAKE PRESSURE SENSOR RETURN CIRCUIT





Turn the ignition off.
Disconnect the Anti-Lock Brake Module harness connector.
Disconnect the Brake Pressure Sensor harness connector.
Measure the resistance between the (B83) Brake Pressure Sensor Supply and the (B984) Brake Pressure Sensor Return circuit.

Is the resistance below 150 ohms?

Yes

- Repair the (B83) Brake Pressure Sensor Supply and (B984) Brake Pressure Sensor Return circuits for a short together.
- Perform ABS VERIFICATION TEST - VER 1. ABS Verification Test.

No

- Go To 6

6. CHECK THE (B83) BRAKE PRESSURE SENSOR SUPPLY CIRCUIT FOR SHORT TO GROUND





Turn the ignition off.
Disconnect the Anti-Lock Brake Module harness connector.
Disconnect the Brake Pressure Sensor harness connector.
Turn the ignition on.
Using a 12-volt test light connected to l2wolts check the (B83) Brake Pressure Sensor Supply circuit.

Does the test light illuminate brightly?

Yes

- Repair the (B83) Brake Pressure Sensor Supply circuit for a short to ground.
- Perform ABS VERIFICATION TEST VER 1. ABS Verification Test.

No

- Go To 7

7. CHECK THE (B83) BRAKE PRESSURE SENSOR SUPPLY CIRCUIT FOR SHORT TO VOLTAGE





Turn the ignition off.
Disconnect the Anti-Lock Brake Module harness connector.
Disconnect the Brake Pressure Sensor harness connector.
Turn the ignition on.
Using a 12-volt test light connected to ground check the (B83) Brake Pressure Sensor Supply circuit.

Does the test light illuminate brightly

Yes

- Repair the (B83) Brake Pressure Sensor Supply circuit for a short to voltage.
- Perform ABS VERIFICATION TEST - VER 1. ABS Verification Test.

No

- Go To 8

8. CHECK THE (B83) BRAKE PRESSURE SENSOR SUPPLY CIRCUIT FOR AN OPEN





Turn the ignition off.
Disconnect the Anti-Lock Brake Module harness connector.
Disconnect the Brake Pressure Sensor harness connector.
Connect a jumper wire between the (B83) Brake Pressure Sensor Supply circuit and ground.
Using a 12-volt test light connected to 12-volts check the (B83) Brake Pressure Sensor Supply circuit.

Does the test light illuminate brightly?

Yes

- Replace the Anti-Lock Brake Module.
- Perform ABS VERIFICATION TEST - VER 1. ABS Verification Test.

No

- Repair the (B83) Brake Pressure Sensor Supply circuit for an open.
- Perform ABS VERIFICATION TEST - VER 1. ABS Verification Test.