VERIFICATION
HINT: After carrying out the repair check that the fault has been remedied.
Scheme 10
Scheme 11
- Ignition off, wait for at least 1 minute
- Disconnect the battery negative lead
- Reinstall the connectors, components etc.
- Connect the battery negative lead.
- Switch on the ignition. Wait 10 seconds. Read diagnostic trouble codes by clicking the VCT2000 symbol. If the fault is intermittent, the fault has been remedied.
Is the fault intermittent?
- YES VERIFIED: Troubleshooting has been completed.
- NO Refer to «INFORMATION»(ref-466773-S37463510052012042500000)
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.
CHECKING THE COMPONENT
- Disconnect any connection from the socket for the tow hitch connector
- Ignition off, wait for at least 1 minute
- Break the power supply to the trailer module (TRM) by disconnecting the battery negative lead. Wait 10 seconds
- Connect the battery negative lead. CAUTION: Do not touch the terminal pins in the trailer module (TRM). There is a risk of static discharge which could damage the control module. Download new software and reprogram the trailer module (TRM). If the fault remains after reprogramming, replace the trailer module (TRM). Other information see «SIGNAL SPECIFICATION»(ref-466643-S26754525212012042500000) For further information about cable routing and terminals, see the wiring diagram see «BATTERY DISCONNECTING AND CONNECTING»(ref-466644-S02084484912012042500000) see «TRAILER MODULE (TRM)»(ref-466926-S31713013162012042500000)
- Continue Refer to «VERIFICATION»(ref-466773-S26307204872012042500000)
HINT: After carrying out the repair check that the fault has been remedied.
- Ignition off, wait for at least 1 minute
- Disconnect the battery negative lead
- Reinstall the connectors, components etc.
- Connect the battery negative lead.
- Switch on the ignition. Wait 10 seconds. Read diagnostic trouble codes by clicking the VCT2000 symbol. If the fault is intermittent, the fault has been remedied.
Is the fault intermittent?
- YES VERIFIED: Troubleshooting has been completed.
- NO Refer to «INFORMATION»(ref-466773-S03423966152012042500000)
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.
HINT: After carrying out the repair check that the fault has been remedied.
- Ignition off, wait for at least 1 minute
- Disconnect the battery negative lead
- Reinstall the connectors, components etc.
- Connect the battery negative lead.
- Switch on the ignition. Wait 10 seconds. Read diagnostic trouble codes by clicking the VCT2000 symbol. If the fault is intermittent, the fault has been remedied.
Is the fault intermittent?
- YES VERIFIED: Troubleshooting has been completed.
- NO Refer to «INFORMATION»(ref-466773-S34692674142012042500000)
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.
HINT: After carrying out the repair check that the fault has been remedied.
- Ignition off, wait for at least 1 minute
- Disconnect the battery negative lead
- Reinstall the connectors, components etc.
- Connect the battery negative lead.
- Switch on the ignition. Wait 10 seconds. Read diagnostic trouble codes by clicking the VCT2000 symbol. If the fault is intermittent, the fault has been remedied.
Is the fault intermittent?
- YES VERIFIED: Troubleshooting has been completed.
- NO Refer to «INFORMATION»(ref-466773-S28396489822012042500000)
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.
HINT: After carrying out the repair check that the fault has been remedied.
- Ignition off, wait for at least 1 minute
- Disconnect the battery negative lead
- Reinstall the connectors, components etc.
- Connect the battery negative lead.
- Switch on the ignition. Wait 10 seconds. Read diagnostic trouble codes by clicking the VCT2000 symbol. If the fault is intermittent, the fault has been remedied.
Is the fault intermittent?
- YES VERIFIED: Troubleshooting has been completed.
- NO Refer to «INFORMATION»(ref-466773-S26936743582012042500000)
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.
HINT: After carrying out the repair check that the fault has been remedied.
- Ignition off, wait for at least 1 minute
- Disconnect the battery negative lead
- Reinstall the connectors, components etc.
- Connect the battery negative lead.
- Switch on the ignition. Wait 10 seconds. Read diagnostic trouble codes by clicking the VCT2000 symbol. If the fault is intermittent, the fault has been remedied.
Is the fault intermittent?
- YES VERIFIED: Troubleshooting has been completed.
- NO Refer to «INFORMATION»(ref-466773-S08684346262012042500000)
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.
HINT: After carrying out the repair check that the fault has been remedied.
- Ignition off, wait for at least 1 minute
- Disconnect the battery negative lead
- Reinstall the connectors, components etc.
- Connect the battery negative lead.
- Switch on the ignition. Wait 10 seconds. Read diagnostic trouble codes by clicking the VCT2000 symbol. If the fault is intermittent, the fault has been remedied.
Is the fault intermittent?
- YES VERIFIED: Troubleshooting has been completed.
- NO Refer to «INFORMATION»(ref-466773-S10517634092012042500000)
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.
HINT: After carrying out the repair check that the fault has been remedied.
- Ignition off, wait for at least 1 minute
- Disconnect the battery negative lead
- Reinstall the connectors, components etc.
- Connect the battery negative lead.
- Switch on the ignition. Wait 10 seconds. Read diagnostic trouble codes by clicking the VCT2000 symbol. If the fault is intermittent, the fault has been remedied.
Is the fault intermittent?
- YES VERIFIED: Troubleshooting has been completed.
- NO Refer to «INFORMATION»(ref-466773-S21857081212012042500000)
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.
HINT: After carrying out the repair check that the fault has been remedied.
- Ignition off, wait for at least 1 minute
- Disconnect the battery negative lead
- Reinstall the connectors, components etc.
- Connect the battery negative lead.
- Switch on the ignition. Wait 10 seconds. Read diagnostic trouble codes by clicking the VCT2000 symbol. If the fault is intermittent, the fault has been remedied.
Is the fault intermittent?
- YES VERIFIED: Troubleshooting has been completed.
- NO Refer to «INFORMATION»(ref-466773-S12713184032012042500000)
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.
HINT: After carrying out the repair check that the fault has been remedied.
- Ignition off, wait for at least 1 minute
- Disconnect the battery negative lead
- Reinstall the connectors, components etc.
- Connect the battery negative lead.
- Switch on the ignition. Wait 10 seconds. Read diagnostic trouble codes by clicking the VCT2000 symbol. If the fault is intermittent, the fault has been remedied.
Is the fault intermittent?
- YES VERIFIED: Troubleshooting has been completed.
- NO Refer to «INFORMATION»(ref-466773-S25518155472012042500000)
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.
HINT: After carrying out the repair check that the fault has been remedied.
- Ignition off, wait for at least 1 minute
- Disconnect the battery negative lead
- Reinstall the connectors, components etc.
- Connect the battery negative lead.
- Switch on the ignition. Wait 10 seconds.
- Depress the brake pedal 10 times. Wait for 1 second between each time. Read diagnostic trouble codes by clicking the VCT2000 symbol. If the fault is intermittent, the fault has been remedied.
Is the fault intermittent?
- YES VERIFIED: Troubleshooting has been completed.
- NO Refer to «INFORMATION»(ref-466773-S24911285492012042500000)
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.
HINT: After carrying out the repair check that the fault has been remedied.
- Ignition off, wait for at least 1 minute
- Disconnect the battery negative lead
- Reinstall the connectors, components etc.
- Connect the battery negative lead.
- Switch on the ignition. Wait 10 seconds. Read diagnostic trouble codes by clicking the VCT2000 symbol. If the fault is intermittent, the fault has been remedied.
Is the fault intermittent?
- YES VERIFIED: Troubleshooting has been completed.
- NO Refer to «INFORMATION»(ref-466773-S27413624912012042500000)
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.
HINT: After carrying out the repair check that the fault has been remedied.
- Ignition off, wait for at least 1 minute
- Disconnect the battery negative lead
- Reinstall the connectors, components etc.
- Connect the battery negative lead.
- Switch on the ignition. Wait 10 seconds. Read diagnostic trouble codes by clicking the VCT2000 symbol. If the fault is intermittent, the fault has been remedied.
Is the fault intermittent?
- YES VERIFIED: Troubleshooting has been completed.
- NO Refer to «INFORMATION»(ref-466773-S11939886772012042500000)
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.
HINT: After carrying out the repair check that the fault has been remedied.
- Ignition off, wait for at least 1 minute
- Disconnect the battery negative lead
- Reinstall the connectors, components etc.
- Connect the battery negative lead.
- Switch on the ignition. Wait 10 seconds. Read diagnostic trouble codes by clicking the VCT2000 symbol. If the fault is intermittent, the fault has been remedied.
Is the fault intermittent?
- YES VERIFIED: Troubleshooting has been completed.
- NO Refer to «INFORMATION»(ref-466773-S42087741782012042500000)
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.
HINT: After carrying out the repair check that the fault has been remedied.
- Ignition off, wait for at least 1 minute
- Disconnect the battery negative lead
- Reinstall the connectors, components etc.
- Connect the battery negative lead.
- Switch on the ignition. Wait 10 seconds. Read diagnostic trouble codes by clicking the VCT2000 symbol. If the fault is intermittent, the fault has been remedied.
Is the fault intermittent?
- YES VERIFIED: Troubleshooting has been completed.
- NO Refer to «INFORMATION»(ref-466773-S07508990412012042500000)
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.
HINT: After carrying out the repair check that the fault has been remedied.
- Ignition off, wait for at least 1 minute
- Disconnect the battery negative lead
- Reinstall the connectors, components etc.
- Connect the battery negative lead.
- Switch on the ignition. Wait 10 seconds. Read diagnostic trouble codes by clicking the VCT2000 symbol. If the fault is intermittent, the fault has been remedied.
Is the fault intermittent?
- YES VERIFIED: Troubleshooting has been completed.
- NO Refer to «INFORMATION»(ref-466773-S29163856592012042500000)
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.
HINT: After carrying out the repair check that the fault has been remedied.
- Ignition off, wait for at least 1 minute
- Disconnect the battery negative lead
- Reinstall the connectors, components etc.
- Connect the battery negative lead.
- Switch on the ignition. Wait 10 seconds. Read diagnostic trouble codes by clicking the VCT2000 symbol. If the fault is intermittent, the fault has been remedied.
Is the fault intermittent?
- YES VERIFIED: Troubleshooting has been completed.
- NO Refer to «INFORMATION»(ref-466773-S25460897492012042500000)
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.
TAKING READING ON CABLES IN THE CAN NETWORK (LS-CAN)
- Ignition off
- Disconnect the battery negative lead. NOTE: see «BATTERY DISCONNECTING AND CONNECTING»(ref-466644-S02084484912012042500000)
- Remove the central electronic module (CEM)
- Connect the breakout box to the cable harness for the central electronic module (CEM). Do not connect the central electronic module (CEM). HINT: Where a breakout box cannot be used, take readings from the rear of the affected connectors if possible. This prevents terminal pins and socket housings being damaged. Disconnect the CAN network to make it easier to locate a fault. A suitable point to disconnect the network is at the central electronic module (CEM). Fault-tracing therefore starts from the central electronic module (CEM). Take resistance readings across the following terminals. Various readings must be taken due to the structure of the network. Twist the cable harness and work the connectors during each measurement to identify any intermittent short-circuits. NOTE: The following resistance readings only measure the main arteries in the low speed sector of the controller area network (CAN), not the junctions that exist for some control modules. If an open-circuit is suspected in a cable, or a short-circuit is suspected in one of its junctions, the connector at the control module for this junction must be disconnected and the reading taken from there. Take the following readings Between terminals #F15 (#15) and #F30 (#30). Check the resistance. The resistance must be approximately 120 ohms. Between terminal #F15 (#15) and a terminal for supply voltage, and between terminal #F15 (#15) and a terminal for ground. Check the resistance. The resistance must be infinite or very high in both cases (higher than 1 Mohms) Between terminal #F30 (#30) and a terminal for supply voltage, and between terminal #F30 (#30) and a terminal for ground. Check the resistance. The resistance must be infinite or very high in both cases (higher than 1 Mohms). Between terminals #B8 (#8) and #B9 (#9). Check the resistance. The resistance must be approximately 120 ohms. Between terminal #B8 (#8) and a terminal for supply voltage, and between terminal #B8 (#8) and a terminal for ground. Check the resistance. The resistance must be infinite or very high in both cases (higher than 1 Mohms) Between terminal #B9 (#9) and a terminal for supply voltage, and between terminal #B9 (#9) and a terminal for ground. Check the resistance. The resistance must be infinite or very high in both cases (higher than 1 Mohms). Between terminals #B24 (#24) and #B25 (#25). Check the resistance. The resistance will be approximately 37 kohms. The resistance must not be 0 ohms! NOTE: The reading will only be obtained if a phone module (PHM) is installed. If a carphone is not installed, the resistance should be infinite. Between terminal #B24 (#24) and a terminal for supply voltage, and between terminal #B24 (#24) and a terminal for ground. Check the resistance. The resistance must be infinite or very high in both cases (higher than 1 Mohms) Between terminal #B25 (#25) and a terminal for supply voltage, and between terminal #B25 (#25) and a terminal for ground. Check the resistance. The resistance must be infinite or very high in both cases (higher than 1 Mohms). Between terminals #G16 (#16) and #G32 (#32). Check the resistance. The resistance will be approximately 37 kohms. The resistance must not be 0 ohms! NOTE: The reading will only be obtained if a combustion preheater module (CPM) is installed. If the engine coolant heater is not installed, the resistance must be infinite. Between terminal #G16 (#16) and a terminal for supply voltage, and between terminal #G16 (#16) and a terminal for ground. Check the resistance. The resistance must be infinite or very high in both cases (higher than 1 Mohms) Between terminal #G32 (#32) and a terminal for supply voltage, and between terminal #G32 (#32) and a terminal for ground. Check the resistance. The resistance must be infinite or very high in both cases (higher than 1 Mohms). HINT: If a fault is found, try to disconnect the junction with the fault at a point further forward. Disconnect any connector/control module immediately before the measurement point and take the reading again. Try to locate the fault in this way. Remedy as necessary. Other information see «CONNECTING THE BREAKOUT BOX (2005-2007)»(ref-466603-S07791358282012042500000) see «SIGNAL DESCRIPTION CENTRAL ELECTRONIC MODULE (CEM)»(ref-466605-S19084002022012042500000) see «CHECKING WIRING AND TERMINALS»(ref-466589-S38415998382012042500000)
Was a fault detected?
- YES Refer to «VERIFICATION»(ref-466773-S37771401002012042500000)
- NO Refer to «CHECKING THE TRAFFIC LOAD ON THE CAN CABLES»(ref-466773-S11513078492012042500000)
Scheme 12
- Connect the central electronic module (CEM) to the breakout box
- Connect the battery. see «BATTERY DISCONNECTING AND CONNECTING»(ref-466644-S02084484912012042500000)
- Ignition on. NOTE: When the adapter cable harness and the central electronic module (CEM) have been connected, there is access to both sides of the CAN network (both LS-CAN and HS-CAN). There will also be traffic on both networks. Be careful to check the terminals between which the readings are to be taken so that the intended reading is not taken on the wrong network. Faults in the CAN network may be due to a control module sending faulty messages that disrupt "normal" communication. When messages are sent incorrectly, this results in a considerable increase in the amount of traffic on the CAN network. Check the load by measuring the average voltage value on the CAN cables in relation to ground. Check as follows: Measure the voltage between terminal #B9 (#9) (LS-CAN-L) and ground. The voltage must be approximately 2.3 V Measure the voltage between terminal #B8 (#8) (LS-CAN-H) and ground. The voltage must be approximately 2.8 V.
Is the value OK?
- YES Refer to «INFORMATION»(ref-466773-S41525604782012042500000)
- NO Refer to «IDENTIFYING A CONTROL MODULE IN THE CAN NETWORK»(ref-466773-S06532859692012042500000)
IDENTIFYING A CONTROL MODULE IN THE CAN NETWORK
If the load on the CAN network is too high, this may be due to a control module transmitting faulty messages on the CAN network. This is called a disruptive control module. The fault may also be due to an intermittent short-circuit to supply voltage or ground in one of the CAN cables. This results in the control modules on the CAN network starting to send faulty messages. An intermittent short-circuit may occur without a diagnostic trouble code (DTC) being stored by any of the control modules.
Note. It is not necessarily the control module(s) that stored the diagnostic trouble code (DTC) that is communicating faultily. Faulty messages can come from any control module in the same section of the CAN network. However, faulty communication in one network cannot affect the communication on the other network. In other words, faulty communication on the LS-CAN cannot disrupt communication on the HS-CAN and vice versa.
Check the communication/load on the CAN network by measuring the voltage between terminals #B8 (#8) and #B9 (#9). The average voltage must be approximately 0.5 V (0.4-0.6 V). If there is a fault in the communication, the voltage reading will be approximately 0.7 V or higher.
In order to identify which control module is communicating incorrectly, cut the power supply to one control module at a time. Check the voltage in the CAN cables again. The easiest way to cut the power supply is to remove the fuse(s) for the relevant control module. Continue until the voltage between the CAN cables drops to approximately 0.5 V.
HINT: When the suspected control module has been identified, connect and disconnect the supply voltage to the control module a number of times to verify that the fault appears and disappears. Switch off the ignition between each check.
Note. Do not cut the power to the central electronic module (CEM) unless it is the last control module left to check.
A control module that is communicating incorrectly must be replaced. Remedy as necessary.
Note. Following a fault involving control modules that disrupt communication, other control modules may be placed in Limp-Home mode (i. e. they work but with limited functionality) even after switching the ignition off and on a number of times. To remedy this, disconnect and reconnect the battery negative terminal to restore the control modules to normal function.
Remedy as necessary.
- Continue Refer to «VERIFICATION»(ref-466773-S37771401002012042500000)
Verification shows that the fault is no longer present. The diagnostic trouble code (DTC) was probably caused by an intermittent fault.
Fault-tracing for this diagnostic trouble code (DTC) is not followed by a verification.
You can view the information again or exit fault-tracing for this diagnostic trouble code (DTC).
HINT: Once a fault has been repaired, conduct a verification to check that the fault has been remedied.
- Reinstall the connectors, components etc.
- Ignition on
- Erase diagnostic trouble codes by clicking the VCT2000 symbol
- Start the car. Allow the car to run for 10 minutes. Read off diagnostic trouble codes (DTCs).
Does the diagnostic trouble code (DTC) for faulty communication return?
- YES VERIFIED: Troubleshooting has been completed.
- NO Refer to «INFORMATION»(ref-466773-S26896662752012042500000)
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.
- Ignition off
- Disconnect the battery negative lead. NOTE: see «BATTERY DISCONNECTING AND CONNECTING»(ref-466644-S02084484912012042500000)
- Remove the central electronic module (CEM)
- Connect the breakout box to the cable harness for the central electronic module (CEM). Do not connect the central electronic module (CEM). HINT: Where a breakout box cannot be used, take readings from the rear of the affected connectors if possible. This prevents terminal pins and socket housings being damaged. Disconnect the CAN network to make it easier to locate a fault. A suitable point to disconnect the network is at the central electronic module (CEM). Fault-tracing therefore starts from the central electronic module (CEM). Take resistance readings across the following terminals. Various readings must be taken due to the structure of the network. Twist the cable harness and work the connectors during each measurement to identify any intermittent short-circuits. NOTE: The following resistance readings only measure the main arteries in the low speed sector of the controller area network (CAN), not the junctions that exist for some control modules. If an open-circuit is suspected in a cable, or a short-circuit is suspected in one of its junctions, the connector at the control module for this junction must be disconnected and the reading taken from there. Take the following readings Between terminals #F15 (#15) and #F30 (#30). Check the resistance. The resistance must be approximately 120 ohms. Between terminal #F15 (#15) and a terminal for supply voltage, and between terminal #F15 (#15) and a terminal for ground. Check the resistance. The resistance must be infinite or very high in both cases (higher than 1 Mohms) Between terminal #F30 (#30) and a terminal for supply voltage, and between terminal #F30 (#30) and a terminal for ground. Check the resistance. The resistance must be infinite or very high in both cases (higher than 1 Mohms). Between terminals #B8 (#8) and #B9 (#9). Check the resistance. The resistance must be approximately 120 ohms. Between terminal #B8 (#8) and a terminal for supply voltage, and between terminal #B8 (#8) and a terminal for ground. Check the resistance. The resistance must be infinite or very high in both cases (higher than 1 Mohms) Between terminal #B9 (#9) and a terminal for supply voltage, and between terminal #B9 (#9) and a terminal for ground. Check the resistance. The resistance must be infinite or very high in both cases (higher than 1 Mohms). Between terminals #B24 (#24) and #B25 (#25). Check the resistance. The resistance will be approximately 37 kohms. The resistance must not be 0 ohms! NOTE: The reading will only be obtained if a phone module (PHM) is installed. If a carphone is not installed, the resistance should be infinite. Between terminal #B24 (#24) and a terminal for supply voltage, and between terminal #B24 (#24) and a terminal for ground. Check the resistance. The resistance must be infinite or very high in both cases (higher than 1 Mohms) Between terminal #B25 (#25) and a terminal for supply voltage, and between terminal #B25 (#25) and a terminal for ground. Check the resistance. The resistance must be infinite or very high in both cases (higher than 1 Mohms). Between terminals #G16 (#16) and #G32 (#32). Check the resistance. The resistance will be approximately 37 kohms. The resistance must not be 0 ohms! NOTE: The reading will only be obtained if a combustion preheater module (CPM) is installed. If the engine coolant heater is not installed, the resistance must be infinite. Between terminal #G16 (#16) and a terminal for supply voltage, and between terminal #G16 (#16) and a terminal for ground. Check the resistance. The resistance must be infinite or very high in both cases (higher than 1 Mohms) Between terminal #G32 (#32) and a terminal for supply voltage, and between terminal #G32 (#32) and a terminal for ground. Check the resistance. The resistance must be infinite or very high in both cases (higher than 1 Mohms). HINT: If a fault is found, try to disconnect the junction with the fault at a point further forward. Disconnect any connector/control module immediately before the measurement point and take the reading again. Try to locate the fault in this way. Remedy as necessary. Other information see «CONNECTING THE BREAKOUT BOX (2008-2011)»(ref-466603-S24918498562012042500000) see «SIGNAL DESCRIPTION CENTRAL ELECTRONIC MODULE (CEM)»(ref-466605-S14017567442012042500000) see «CHECKING WIRING AND TERMINALS»(ref-466589-S38415998382012042500000)
Was a fault detected?
- YES Refer to «VERIFICATION»(ref-466773-S02683207042012042500000)
- NO Refer to «CHECKING THE TRAFFIC LOAD ON THE CAN CABLES»(ref-466773-S16954200212012042500000)
CHECKING THE TRAFFIC LOAD ON THE CAN CABLES
- Connect the central electronic module (CEM) to the breakout box
- Connect the battery. see «BATTERY DISCONNECTING AND CONNECTING»(ref-466644-S02084484912012042500000)
- Ignition on. NOTE: When the adapter cable harness and the central electronic module (CEM) have been connected, there is access to both sides of the CAN network (both LS-CAN and HS-CAN). There will also be traffic on both networks. Be careful to check the terminals between which the readings are to be taken so that the intended reading is not taken on the wrong network. Faults in the CAN network may be due to a control module sending faulty messages that disrupt "normal" communication. When messages are sent incorrectly, this results in a considerable increase in the amount of traffic on the CAN network. Check the load by measuring the average voltage value on the CAN cables in relation to ground. Check as follows: Measure the voltage between terminal #B9 (#9) (LS-CAN-L) and ground. The voltage must be approximately 2.3 V Measure the voltage between terminal #B8 (#8) (LS-CAN-H) and ground. The voltage must be approximately 2.8 V.
Is the value OK?
- YES Refer to «INFORMATION»(ref-466773-S29152340402012042500000)
- NO Refer to «IDENTIFYING A CONTROL MODULE IN THE CAN NETWORK»(ref-466773-S02854945822012042500000)
If the load on the CAN network is too high, this may be due to a control module transmitting faulty messages on the CAN network. This is called a disruptive control module. The fault may also be due to an intermittent short-circuit to supply voltage or ground in one of the CAN cables. This results in the control modules on the CAN network starting to send faulty messages. An intermittent short-circuit may occur without a diagnostic trouble code (DTC) being stored by any of the control modules.
Note. It is not necessarily the control module(s) that stored the diagnostic trouble code (DTC) that is communicating faultily. Faulty messages can come from any control module in the same section of the CAN network. However, faulty communication in one network cannot affect the communication on the other network. In other words, faulty communication on the LS-CAN cannot disrupt communication on the HS-CAN and vice versa.
Check the communication/load on the CAN network by measuring the voltage between terminals #B8 (#8) and #B9 (#9). The average voltage must be approximately 0.5 V (0.4-0.6 V). If there is a fault in the communication, the voltage reading will be approximately 0.7 V or higher.
In order to identify which control module is communicating incorrectly, cut the power supply to one control module at a time. Check the voltage in the CAN cables again. The easiest way to cut the power supply is to remove the fuse(s) for the relevant control module. Continue until the voltage between the CAN cables drops to approximately 0.5 V.
HINT: When the suspected control module has been identified, connect and disconnect the supply voltage to the control module a number of times to verify that the fault appears and disappears. Switch off the ignition between each check.
Note. Do not cut the power to the central electronic module (CEM) unless it is the last control module left to check.
A control module that is communicating incorrectly must be replaced. Remedy as necessary.
Note. Following a fault involving control modules that disrupt communication, other control modules may be placed in Limp-Home mode (i. e. they work but with limited functionality) even after switching the ignition off and on a number of times. To remedy this, disconnect and reconnect the battery negative terminal to restore the control modules to normal function.
Remedy as necessary.
- Continue Refer to «VERIFICATION»(ref-466773-S02683207042012042500000)
Verification shows that the fault is no longer present. The diagnostic trouble code (DTC) was probably caused by an intermittent fault.
Fault-tracing for this diagnostic trouble code (DTC) is not followed by a verification.
You can view the information again or exit fault-tracing for this diagnostic trouble code (DTC).
HINT: Once a fault has been repaired, conduct a verification to check that the fault has been remedied.
- Reinstall the connectors, components etc.
- Ignition on
- Erase diagnostic trouble codes by clicking the VCT2000 symbol
- Start the car. Allow the car to run for 10 minutes. Read off diagnostic trouble codes (DTCs).
Does the diagnostic trouble code (DTC) for faulty communication return?
- YES VERIFIED: Troubleshooting has been completed.
- NO Refer to «INFORMATION»(ref-466773-S30357705722012042500000)
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.
HINT: After carrying out the repair check that the fault has been remedied.
- Ignition off, wait for at least 1 minute
- Disconnect the battery negative lead
- Reinstall the connectors, components etc.
- Connect the battery negative lead.
- Switch on the ignition. Wait 10 seconds. Read diagnostic trouble codes by clicking the VCT2000 symbol. If the fault is intermittent, the fault has been remedied.
Is the fault intermittent?
- YES VERIFIED: Troubleshooting has been completed.
- NO Refer to «INFORMATION»(ref-466773-S03496391992012042500000)
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.