Operation CHARM: Car repair manuals for everyone.
Hosted by mcallihan.com
Home >> Volvo >> 2001 >> S80 2.9 L6-2.9L VIN 94 B6294S >> 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 the ABS Control Module. Signal Missing. 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 Connecting the Breakout Box
- For information about signals, see Signal specification, ABS control module Signal Specification, ABS Control Module.





Was a fault detected?

Yes - FAULT FOUND

No - No Fault Found

------------------------

FAULT FOUND - Verification

No Fault Found - Checking connectors

-------------------------------------------------

Checking connectors
Check connector 54/3 and the connector in the ABS control module. Check for contact resistance and oxidation according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault. Remedy if necessary. Check for any damage.
Check the power supply to the ABS system via fuses 11B/19, 11B/14, 11C/9 and main fuse 11A/3.

Hint: If the fault cause is found, reinstall the components, connectors etc. If the fault cause is not found, do not reinstall the ABS control module.

Other information:
- To access the connector in the ABS control module, see Control module (ABS), replacing Control Module (ABS), Replacing









Was a fault detected?

Yes - Verification

No - Checking the bus cable

-------------------------------------------------

Checking the bus cable




- Disconnect the ABS control module from the bus cable, pull the connector out from the control module.
Measure resistance across terminals #10 and #11 (or #19 and #20).

Note! Take care that you measure directly at the connector so that it is not damaged.

Hint: Only connect a breakout box to the connector, not to the control module. In this way, the direction of any faults in the bus cable can be established.

Note! To obtain the correct value the battery must be disconnected during resistance measurement.

Other information:
- If the car has a switch on the center console with the letters "DSTC", terminals #19 and #20 apply instead of terminals #10 and #11
- The resistance should be approximately 120 Ohms. If another reading is given, there may be an open-circuit in the bus cable
- To connect the breakout box to the ABS control module, see Connecting the ABS breakout box Connecting the Breakout Box
- To disconnect the battery, see Battery, disconnecting Battery Disconnecting





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

Yes - Replacing ABS control module

No - Checking for an open-circuit

-------------------------------------------------

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
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, B5254T2 Connecting the Test Box
To connect the breakout box to the Engine control module (ECM), see: Connecting the breakout box, B5254T2 Connecting the Test 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, B5254T2 Connecting the Test Box
To connect the breakout box to the Engine control module (ECM), see: Connecting the breakout box, B5254T2 Connecting the Test 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, B5254T2 Connecting the Test 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: Connecting the breakout box, 4T65EV-GT Connecting the Breakout Box
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, B5254T2 Connecting the Test 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: Connecting the breakout box, 4T65EV-GT Connecting the Breakout Box
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: Connecting the breakout box, 4T65EV-GT Connecting the Breakout Box
To connect the breakout box to the Anti-lock brake system module (ABS), see: Connecting the ABS breakout box Connecting the Breakout Box
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: Connecting the breakout box, 4T65EV-GT Connecting the Breakout Box
To connect the breakout box to the Anti-lock brake system module (ABS), see: Connecting the ABS breakout box Connecting the Breakout Box
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, B5254T2 Connecting the Test Box
To connect the breakout box to the Anti-lock brake system module (ABS), see: Connecting the ABS breakout box Connecting the Breakout Box
- 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 Connecting the Breakout Box
- 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 Connecting the Breakout Box

Was a fault detected?

Yes - FAULT FOUND

No - No Fault Found

------------------------

FAULT FOUND - Verification

No Fault Found - Replacing ABS control module

-------------------------------------------------

Replacing ABS control module
Replace the control module according to Control module (ABS), replacing Control Module (ABS), Replacing

Continue - 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 - Verification completed

No - Fault-tracing information

-------------------------------------------------

Fault-tracing 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 - Exit Fault-Tracing

No - Attempt New Test

------------------------

Attempt New Test - Checking the power supply

-------------------------------------------------

pro multis · About Operation CHARM