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Brake Control Module (BCM) Diagnostic Trouble Codes: Overview Volvo V50 I рестайлинг

Anti-Lock/traction Control 1 illustration ~822 words

CHECKING THE OPERATION OF THE PUMP MOTOR

  1. Ignition off
  2. Check the connector on the brake control module (BCM). Check for contact resistance. Check for oxidation
  3. Reconnect the components, connectors, etc.
  4. Ignition on
  5. Activate the pump motor. Check that the pump motor starts and operates normally. If the pump motor starts and seems to operate normally, the cause of the fault was probably contact resistance and oxidation in the control module connector. Other information see «CONNECTING THE BREAKOUT BOX»(ref-466620-S12723038012012042500000) see «CHECKING WIRING AND TERMINALS»(/volvo/v50/i-2007-2012/remont/body-electrical/#electrical-general-diagnostics-and-tests)

Is the pump OK?

  1. YES OKAY: Troubleshooting has been completed.
  2. NO see «CHECKING THE WIRING AND COMPONENT»(ref-466742-S12018698652012042500000)

Scheme 13

Scheme 13
Scheme 13
  1. Ignition off. Check the circuit for the pump motor between brake control module (BCM) terminal #1 (#A1) and the fuse in the integrated relay/fusebox in the engine compartment. Check for an open-circuit. Check for a short-circuit to ground. Check the fuse for the brake system in the integrated relay / fusebox in the engine compartment. If the fuse is blown, check the cable between the fuse and brake control module (BCM) terminal #1 (#A1). Check for a short-circuit to ground. Then replace the fuse. Remedy as necessary. Other information see «CONNECTING THE BREAKOUT BOX»(ref-466620-S12723038012012042500000) see «HYDRAULIC UNIT BRAKE SYSTEM»(/volvo/v50/i-2007-2012/remont/anti-locktraction-control/#brake-control-system-removal-replacement-and-installation) see «CHECKING WIRING AND TERMINALS»(/volvo/v50/i-2007-2012/remont/body-electrical/#electrical-general-diagnostics-and-tests)

Was a fault detected?

  1. YES see «VERIFICATION»(ref-466742-S16260784552012042500000)
  2. NO see «INFORMATION»(ref-466742-S41806679442012042500000)
  1. Ignition off
  2. Check the connector on the brake control module (BCM). Check for contact resistance. Check for oxidation
  3. Reconnect the components, connectors, etc.
  4. Ignition on
  5. Activate the pump motor. Check that the pump motor starts and operates normally. If the pump motor starts and seems to operate normally, the cause of the fault was probably contact resistance and oxidation in the connector on the brake control module (BCM). Other information see «CONNECTING THE BREAKOUT BOX»(ref-466620-S12723038012012042500000) see «CHECKING WIRING AND TERMINALS»(/volvo/v50/i-2007-2012/remont/body-electrical/#electrical-general-diagnostics-and-tests)

Is the pump OK?

  1. YES OKAY: Troubleshooting has been completed.
  2. NO see «CHECKING THE WIRING AND COMPONENT»(ref-466742-S09408580842012042500000)
  1. Ignition off
  2. Check the connector on the brake control module (BCM). Check for contact resistance. Check for oxidation
  3. Reconnect the components, connectors, etc.
  4. Ignition on
  5. Activate the pump motor. Check that the pump motor starts and operates normally. If the pump motor starts and seems to operate normally, the cause of the fault was contact resistance and oxidation in the control module connector. Other information see «CONNECTING THE BREAKOUT BOX»(ref-466620-S12723038012012042500000) see «CHECKING WIRING AND TERMINALS»(/volvo/v50/i-2007-2012/remont/body-electrical/#electrical-general-diagnostics-and-tests)

Is the pump OK?

  1. YES OKAY: Troubleshooting has been completed.
  2. NO see «CHECKING THE WIRING AND COMPONENT»(ref-466742-S25425618502012042500000)

GENERAL INFORMATION

The diagnostic trouble code (DTC) is stored when the communication between the central electronic module (CEM) and the relevant control module has been interrupted. There can be a number of causes for interruptions in the communication

  1. Faulty signal configuration in the control module that stored the diagnostic trouble code (DTC). The fault can be due to a customer or workshop replacing a control module without downloading new software for the replacement
  2. Intermittent open-circuit in one or both CAN cables in part of the network
  3. Intermittent short-circuits between the CAN cables
  4. Intermittent short-circuits between one of the CAN cables and ground or supply voltage
  5. Internal fault in the control module that stored the diagnostic trouble code (DTC).

The fault can also be due to faulty software in a control module, a hardware problem in the CAN network (faulty cables) or a fault in a control module.

Note. If there is a diagnostic trouble code (DTC) for a communication fault in a control module, check whether diagnostic trouble codes (DTCs) have been stored in the central electronic module (CEM). The central electronic module (CEM) monitors the voltage level in the CAN cables and is the only control module that can directly store a diagnostic trouble code (DTC) for a short-circuit in one of the cables for ground or supply voltage. Do not replace the central electronic module (CEM) in the event of a CAN fault unless fault-tracing has indicated that the central electronic module (CEM) has an internal fault.

Corrective actions

  1. If this diagnostic trouble code (DTC) is the only communication diagnostic trouble code (DTC) stored in one of the control modules in the high speed network, try to remedy the fault by downloading new software for the control module that stored the diagnostic trouble code (DTC)
  2. Check the cables in the CAN network according to the following fault-tracing
  3. The control module should be replaced as a last resort.

Other information

  1. see «GENERAL INFORMATION ABOUT FAULT-TRACING IN THE CAN NETWORK»(ref-466603-S14975733402012042500000)
  2. To download software to the relevant control module, see Replacement parts catalogue/Software index or the Software manager.
  1. Continue see «VERIFICATION»(ref-466742-S06684178982012042500000)

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