Chrysler Crossfire. Manual — part 90

CAB SYSTEM UNDERVOLTAGE

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BRAKES - ABS ELECTRICAL DIAGNOSTICS

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CAB SYSTEM UNDERVOLTAGE (CONTINUED)

When Monitored and Set Condition

•

When Monitored: Ignition on. The Controller Antilock Brake (CAB) monitors the Fused B(+) circuit voltage
above 10 km/h (6 MPH) every 7 milliseconds for proper system voltage.

•

Set Condition: If the voltage is below 9.5 volts, the Diagnostic Trouble Code (DTC) is set.

POSSIBLE CAUSES

BATTERY VOLTAGE LOW

FUSED B(+) CIRCUIT OPEN

CONTROLLER ANTILOCK BRAKE

For a complete Brake Assist System (BAS) Circuit Diagram (Refer to 5 - BRAKES/ELECTRICAL - SCHEMATICS
AND DIAGRAMS).

Diagnostic Test

1.

WITH THE DRB III

T

, READ DTCs

Turn the ignition on.

With the DRB III

T

, erase DTCs.

Turn the ignition off.

Turn the ignition on.

Start the engine.

Drive the vehicle above 16 km/h (10 MPH) for at least 20 seconds.

Stop the vehicle.

With the DRB III

T

, read DTCs.

Does the DRB III

T

display a System Undervoltage DTC?

Yes

>> Go to 2

No

>> The condition that caused this DTC to set is currently not

present. Inspect the related wiring harness for a possible intermittent condition.

2.

MEASURE THE BATTERY VOLTAGE

Start the engine.

Measure the battery voltage with the engine running.

Is the battery voltage below 10 volts?

Yes

>> Refer to the appropriate service information for charging

system testing and repair.

Perform ABS VERIFICATION TEST.

No

>> Go to 3

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BRAKES - ABS ELECTRICAL DIAGNOSTICS

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CAB SYSTEM UNDERVOLTAGE (CONTINUED)

3.

MEASURE THE VOLTAGE OF THE FUSED B(+) CIRCUIT

Turn the ignition off.

Disconnect the CAB harness connector.

Note: Check connectors - Clean/repair as necessary.
Turn the ignition on.

Measure the voltage of the Fused B(+) circuit at cavity 45 of the CAB
harness connector.

Is the voltage above 10 volts?

Yes

>> Go to 4

No

>> Repair the Fused B(+) circuit for an open.

Perform ABS VERIFICATION TEST.

4.

MEASURE THE VOLTAGE OF THE FUSED B(+) CIRCUIT

With the ignition on.

Measure the voltage of the Fused B(+) circuit at cavity 47 of the CAB
harness connector.

Is the voltage above 10 volts?

Yes

>> Replace the Controller Antilock Brake. (Refer to 8 - ELEC-

TRICAL/ELECTRONIC CONTROL MODULES/CONTROL-
LER ANTILOCK BRAKE - REMOVAL).

Perform ABS VERIFICATION TEST.

No

>> Repair the Fused B(+) circuit for an open.

Perform ABS VERIFICATION TEST.

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BRAKES - ABS ELECTRICAL DIAGNOSTICS

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CAB SYSTEM OVERVOLTAGE

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BRAKES - ABS ELECTRICAL DIAGNOSTICS

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