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Home >> Volvo >> 2001 >> V70 XC AWD L5-2.4L Turbo VIN 58 B5244T3 >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> Manufacturer Code Charts >> CEM Codes (Central Electronic Module) >> CEM-1A5F >> Communication with ABS Control Unit. No Signal. Permanent Fault >> Signal Missing. Permanent Fault

Signal Missing. Permanent Fault






Signal missing. Permanent fault

Checking the power supply





Checking the power supply and ground terminals for the control module. Permanent fault

Checking the power supply and ground terminals
Check the ABS control module connector for contact resistance and oxidation according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Check fuse 11/9 in the fusebox in the passenger compartment.

Note! If the fuse is blown, check the circuit after the fuse for a short-circuit to ground before replacing the fuse. Then replace the fuse.

For further information about the circuit after the fuse, refer to the appropriate wiring diagram.
Check the power supply cable between fuse 11/9 and the control module for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Also check the wiring between control module terminals #A8 and #A24 and ground terminal 31/95. Check for contact resistance and oxidation according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault. Check for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Remedy as necessary.

Other information:
- To connect the breakout box, see Connecting the ABS breakout box Pinout Values and Diagnostic Parameters
- For information about signals, see Signal specification, ABS control module Signal Specification.





Was a fault detected?

Yes - Fault Found

No - No Fault Found

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FAULT FOUND - Verification

No Fault Found - Checking the connectors

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Checking the connectors
Check connector 54/3R and connector in anti-lock braking system (ABS) for contact resistance and oxidation as described in Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault. Check especially for any damage.
Check the voltage supply to the anti-lock braking system (ABS) via fuse 11B/11, fuse 11B/12, fuse 11C/9 and the main fuse 11A/3.

Hint: If cause of fault is found, install components, connect connectors etc. If cause of fault is not found, do not install ABS control unit.

Additional information:
- To access connector in anti-lock braking system (ABS), see
- To access connector 54/3R, see Service Handbook, Section 3, Wiring Diagram. (See figure as well.)









Is there a fault?

Yes - Verification

No - Checking the bus wire

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Checking the bus wire




- Disconnect the anti-lock braking system (ABS) from the bus wire, that is, disconnect connector from control unit.
Check resistance on connector between 10 and 11 (or 19 and 20).

Note! Be careful not to damage the connector when testing directly.

Hint: Connect the test box only to the connector, not to the control unit. This helps to find out where a fault might be on the bus wire.

Note! To maintain the correct values the battery should be disconnected when measuring resistance.

Additional information:
- If the vehicle has a switch button with the text "DSTC" on the centre console, 19 and 20 apply instead of 10 and 11.
- The resistance should be approximately 120 Ohms. If another value is displayed there may be an open circuit on the bus wire.
- To connect the test box to the ABS control unit, see Connecting the ABS breakout box Pinout Values and Diagnostic Parameters
- To disconnect the battery, see Battery, disconnecting Battery Disconnecting





Does the measuring instrument show a resistance of approximately 120 Ohms?

Yes - Replacement of ABS control unit

No - Checking for an open circuit

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Checking for an open circuit





Open-circuit in Control area network bus. High speed network. Permanent fault

Checking the high speed network
The fault source on the bus cable may be a long way from where the check is carried out. Therefore start the check at one end of the cable and work through the bus system methodically until the fault is found.

Other information
- To access the bus cable see the relevant wiring diagram.
Check the bus cable for open-circuits according to: Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault Remember that the CAN network is only a communication network. There are no fuses, contact breakers or sensors on the CAN bus.

Hint: If the fault is detected before all the following cables have been examined, the following cables need not be checked.

Hint: If possible, measure from the rear of the affected connectors so that they are not damaged.

The following cables and connectors must be examined to localize the open-circuit:

Cable between:
- Electronic throttle module (ETM) terminal #4 and Engine control module (ECM) terminal #55A.
To connect the breakout box to the Electronic throttle module (ETM), see: Connecting the breakout box, B5244T5, B5254T2 Connecting the Breakout Box
To connect the breakout box to the Engine control module (ECM), see: Connecting the breakout box, B5244T5, B5254T2 Connecting the Breakout Box
- Electronic throttle module (ETM) terminal #3 and Engine control module (ECM) terminal #37A.
To connect the breakout box to the Electronic throttle module (ETM), see: Connecting the breakout box, B5244T5, B5254T2 Connecting the Breakout Box
To connect the breakout box to the Engine control module (ECM), see: Connecting the breakout box, B5244T5, B5254T2 Connecting the Breakout Box
Note! Applies only to automatic transmissions.

Engine control module (ECM) #1B and transmission control module (TCM) terminal #1B.
To connect the breakout box to the Engine control module (ECM), see: Connecting the breakout box, B5244T5, B5254T2 Connecting the Breakout Box
To connect the breakout box to the Transmission control module (TCM) (AW), see: Connecting breakout box, Transmission control module (TCM) Connecting Breakout Box, Transmission Control Module (TCM)
To connect the breakout box to the Transmission control module (TCM) (GM), see:
Note! Applies only to automatic transmissions.

Engine control module (ECM) terminal #13B and transmission control module (TCM) and terminal #13B.
To connect the breakout box to the Engine control module (ECM), see: Connecting the breakout box, B5244T5, B5254T2 Connecting the Breakout Box
To connect the breakout box to the Transmission control module (TCM) (AW), see: Connecting breakout box, Transmission control module (TCM) Connecting Breakout Box, Transmission Control Module (TCM)
To connect the breakout box to the Transmission control module (TCM) (GM), see:
Note! Applies only to automatic transmissions.

Transmission control module (TCM) terminal #2B and Anti-lock brake system module (ABS) terminal #10 (or terminal #20 if the vehicle has a button with the text "DSTC" on the centre console).
To connect the breakout box to the Transmission control module (TCM) (AW), see: Connecting breakout box, Transmission control module (TCM) Connecting Breakout Box, Transmission Control Module (TCM)
To connect the breakout box to the Transmission control module (TCM) (GM), see:
To connect the breakout box to the Anti-lock brake system module (ABS), see: Connecting the ABS breakout box Pinout Values and Diagnostic Parameters
Note! Applies only to automatic transmissions.

Transmission control module (TCM) terminal #14B and Anti-lock brake system module (ABS) terminal #11 (or terminal #19 if the vehicle has a button with the text "DSTC" on the centre console).
To connect the breakout box to the Transmission control module (TCM) (AW), see: Connecting breakout box, Transmission control module (TCM) Connecting Breakout Box, Transmission Control Module (TCM)
To connect the breakout box to the Transmission control module (TCM) (GM), see:
To connect the breakout box to the Anti-lock brake system module (ABS), see: Connecting the ABS breakout box Pinout Values and Diagnostic Parameters
Note! Applies only to manual transmissions.

There is no transmission control module (TCM) in manual transmission vehicles. The following cables must therefore be examined in this case:
Engine control module (ECM) terminal #1B and Anti-lock brake system module (ABS) terminal #10 (or terminal #20 if the vehicle has a button with the text "DSTC" on the centre console).
Engine control module (ECM) terminal #13B and Anti-lock brake system module (ABS) terminal #11 (or terminal #19 if the vehicle has a button with the text "DSTC" on the centre console).
To connect the breakout box to the Engine control module (ECM), see: Connecting the breakout box, B5244T5, B5254T2 Connecting the Breakout Box
To connect the breakout box to the Anti-lock brake system module (ABS), see: Connecting the ABS breakout box Pinout Values and Diagnostic Parameters
- Central electronic module (CEM) terminal #18B and Anti-lock brake system module (ABS) terminal #10 (or terminal #20 if the vehicle has a button with the text "DSTC" on the centre console) and intermediate connector 54/3R.
For connecting breakout box to Central Electronic Module (CEM): Connecting the breakout box Connecting the Breakout Box, Central Electronic Module (CEM)
To connect the breakout box to the Anti-lock brake system module (ABS), see: Connecting the ABS breakout box Pinout Values and Diagnostic Parameters
- Central electronic module (CEM) terminal #17B and Anti-lock brake system module (ABS) terminal #11 (or terminal #19 if the vehicle has a button with the text "DSTC" on the centre console) and intermediate connector 54/3R.
For connecting breakout box to Central Electronic Module (CEM): Connecting the breakout box Connecting the Breakout Box, Central Electronic Module (CEM)
To connect the breakout box to the Anti-lock brake system module (ABS), see: Connecting the ABS breakout box Pinout Values and Diagnostic Parameters

Was a fault detected?

Yes - Fault Found

No - No Fault Found

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FAULT FOUND - Verification

No Fault Found - Replacement of ABS control unit

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Replacement of ABS control unit
Replace control unit as described in


Continue - Verification

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Verification




Verification

Verification

Hint: After the repair it is necessary to check that the fault has been rectified.




- Ignition off.
- Connect connectors, install components, etc.
- Ignition on. Wait for ten seconds.
Check that diagnostic trouble code status is showing Intermittent.





Does the diagnostic trouble code have the status Intermittent?

Yes - VERIFIED

No - VERIFICATION FAILED

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VERIFIED - Fault Found

VERIFICATION FAILED - Trouble-shooting information

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Trouble-shooting information




Information

Fault-tracing information
The fault should have been detected and remedied. As this is not the case fault-tracing has failed.
Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

Do you want to exit fault-tracing?

Yes - FAULT-TRACING FAILED

No - Attempt New Test

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FAULT-TRACING FAILED - No Fault Found

Attempt New Test - Checking the power supply

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