Lan System: Overview Infiniti QX56 I

System Description

CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle multiplex communication line with high data communication speed and excellent error detection ability. Many electronic control units are equipped onto a vehicle, and each control unit shares information and links with other control units during operation (not independent). In CAN communication, control units are connected with 2 communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring. Each control unit transmits/receives data but selectively reads required data only.

CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle multiplex communication line with high data communication speed and excellent error detection ability. Many electronic control units are equipped onto a vehicle, and each control unit shares information and links with other control units during operation (not independent). In CAN communication, control units are connected with 2 communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring. Each control unit transmits/receives data but selectively reads required data only.

Scheme 179

Scheme 180

Scheme 181

Scheme 182

Scheme 183

Scheme 184

Scheme 185

Scheme 186

1. When there are no indications of "AUTO DRIVE POS.", "BCM", "HVAC" or "IPDM E/R" on "SELECT SYSTEM" display of CONSULT-II, print the "SELECT SYSTEM".
2. Print all the data of "SELF-DIAG RESULTS" for "ENGINE", "A/T", "AUTO DRIVE POS.", "BCM", "HVAC", "ABS" and "IPDM E/R" displayed on CONSULT-II.
3. Print all the data of "CAN DIAG SUPPORT MNTR" for "ENGINE", "A/T", "AUTO DRIVE POS.", "BCM", "HVAC", "ABS" and "IPDM E/R" displayed on CONSULT-II.
4. Attach the printed sheet of "SELECT SYSTEM", "SELF-DIAG RESULTS" and "CAN DIAG SUPPORT MNTR" onto the check sheet. Refer to " «CHECK SHEET»(ref-230070-S23676839792006042700000) ".
5. Based on the indications of "SELECT SYSTEM" and the results of "CAN DIAG SUPPORT MNTR", put marks "v" onto the items with "No indication", "NG" or "UNKWN" in the check sheet table. Refer to " «CHECK SHEET»(ref-230070-S23676839792006042700000) ". NOTE: If "NG" is displayed on "INITIAL DIAG (Initial diagnosis)" as "CAN DIAG SUPPORT MNTR" for the diagnosed control unit, replace the control unit. The "CAN DIAG SUPPORT MNTR" items, which are not in check sheet table, are not related to diagnostic procedure on service manual. So it is not necessary to check the status of the "CAN DIAG SUPPORT MNTR" items not in check sheet table.
6. Check CAN communication line of the navigation system. Refer to " «CAN COMMUNICATION LINE CHECK»(ref-230071-S22933290422006042700000) ".
7. Attach the CAN DIAG SUPPORT MONITOR check sheet onto the check sheet. Refer to " «CHECK SHEET»(ref-230070-S23676839792006042700000) ".
8. Mark the "NG" or "UNKWN" item of the check sheet table with "v" from the result of CAN DIAG SUPPORT MONITOR check sheet. Refer to " «CHECK SHEET»(ref-230070-S23676839792006042700000) ". NOTE: If "NG" is displayed on "CAN COMM" as "CAN DIAG SUPPORT MONITOR" for the diagnosed control unit, replace the control unit. Refer to " «CAN COMMUNICATION LINE CHECK»(ref-230071-S22933290422006042700000) ".
9. According to the check sheet results (example), start inspection. Refer to " «CHECK SHEET RESULTS (EXAMPLE)»(ref-230070-S31300777022006042700000) ".

CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle multiplex communication line with high data communication speed and excellent error detection ability. Many electronic control units are equipped onto a vehicle, and each control unit shares information and links with other control units during operation (not independent). In CAN communication, control units are connected with 2 communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring. Each control unit transmits/receives data but selectively reads required data only.

Scheme 187

Scheme 188

Scheme 189

Scheme 190

Scheme 191

Scheme 192

Scheme 193

1. When there are no indications of "AUTO DRIVE POS.", "BCM", "HVAC" or "IPDM E/R" on "SELECT SYSTEM" display of CONSULT-II, print the "SELECT SYSTEM".
2. Print all the data of "SELF-DIAG RESULTS" for "ENGINE", "A/T", "ICC", "AUTO DRIVE POS.", "BCM", "HVAC", "ABS" and "IPDM E/R" displayed on CONSULT-II.
3. Print all the data of "CAN DIAG SUPPORT MNTR" for "ENGINE", "A/T", "ICC", "AUTO DRIVE POS.", "BCM", "HVAC", "ABS" and "IPDM E/R" displayed on CONSULT-II.
4. Attach the printed sheet of "SELECT SYSTEM", "SELF-DIAG RESULTS" and "CAN DIAG SUPPORT MNTR" onto the check sheet. Refer to " «CHECK SHEET»(ref-230070-S34350530102006042700000) ".
5. Based on the indications of "SELECT SYSTEM" and the results of "CAN DIAG SUPPORT MNTR", put marks "v" onto the items with "No indication", "NG" or "UNKWN" in the check sheet table. Refer to " «CHECK SHEET»(ref-230070-S34350530102006042700000) ". NOTE: If "NG" is displayed on "INITIAL DIAG (Initial diagnosis)" as "CAN DIAG SUPPORT MNTR" for the diagnosed control unit, replace the control unit. The "CAN DIAG SUPPORT MNTR" items, which are not in check sheet table, are not related to diagnostic procedure on service manual. So it is not necessary to check the status of the "CAN DIAG SUPPORT MNTR" items not in check sheet table.
6. Check CAN communication line of the navigation system. Refer to " «CAN COMMUNICATION LINE CHECK»(ref-230071-S22933290422006042700000) ".
7. Attach the CAN DIAG SUPPORT MONITOR check sheet onto the check sheet. Refer to " «CHECK SHEET»(ref-230070-S34350530102006042700000) ".
8. Mark the "NG" or "UNKWN" item of the check sheet table with "v" from the result of CAN DIAG SUPPORT MONITOR check sheet. Refer to " «CHECK SHEET»(ref-230070-S34350530102006042700000) ". NOTE: If "NG" is displayed on "CAN COMM" as "CAN DIAG SUPPORT MONITOR" for the diagnosed control unit, replace the control unit. Refer to " «CAN COMMUNICATION LINE CHECK»(ref-230071-S22933290422006042700000) ".
9. According to the check sheet results (example), start inspection. Refer to " «CHECK SHEET RESULTS (EXAMPLE)»(ref-230070-S15066222032006042700000) ".

CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle multiplex communication line with high data communication speed and excellent error detection ability. Many electronic control units are equipped onto a vehicle, and each control unit shares information and links with other control units during operation (not independent). In CAN communication, control units are connected with 2 communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring. Each control unit transmits/receives data but selectively reads required data only.

Scheme 194

Scheme 195

Scheme 196

Scheme 197

Scheme 198

Scheme 199

Scheme 200

Scheme 201

Scheme 202

1. When there are no indications of "AUTO DRIVE POS.", "BCM", "HVAC", "ALL MODE AWD/4WD" or "IPDM E/R" on "SELECT SYSTEM" display of CONSULT-II, print the "SELECT SYSTEM".
2. Print all the data of "SELF-DIAG RESULTS" for "ENGINE", "A/T", "AUTO DRIVE POS.", "BCM", "HVAC", "ALL MODE AWD/4WD", "ABS" and "IPDM E/R" displayed on CONSULT-II.
3. Print all the data of "CAN DIAG SUPPORT MNTR" for "ENGINE", "A/T", "AUTO DRIVE POS.", "BCM", "HVAC", "ALL MODE AWD/4WD", "ABS" and "IPDM E/R" displayed on CONSULT-II.
4. Attach the printed sheet of "SELECT SYSTEM", "SELF-DIAG RESULTS" and "CAN DIAG SUPPORT MNTR" onto the check sheet. Refer to " «CHECK SHEET»(ref-230070-S15069518542006042700000) ".
5. Based on the indications of "SELECT SYSTEM" and the results of "CAN DIAG SUPPORT MNTR", puts a check mark onto the items with "No indication", "NG" or "UNKWN" in the check sheet table. Refer to " «CHECK SHEET»(ref-230070-S15069518542006042700000) ". CAUTION: "ALL MODE AWD/4WD" puts a check mark on the check sheet when "Present" is "UNKWN" and "Past" is "0". NOTE: If "NG" is displayed on "INITIAL DIAG (Initial diagnosis)" as "CAN DIAG SUPPORT MNTR" for the diagnosed control unit, replace the control unit. The "CAN DIAG SUPPORT MNTR" items, which are not in check sheet table, are not related to diagnostic procedure on service manual. So it is not necessary to check the status of the "CAN DIAG SUPPORT MNTR" items not in check sheet table.
6. Check CAN communication line of the navigation system. Refer to " «CAN COMMUNICATION LINE CHECK»(ref-230071-S22933290422006042700000) ".
7. Attach the CAN DIAG SUPPORT MONITOR check sheet onto the check sheet. Refer to " «CHECK SHEET»(ref-230070-S15069518542006042700000) ".
8. Mark the "NG" or "UNKWN" item of the check sheet table with "v" from the result of CAN DIAG SUPPORT MONITOR check sheet. Refer to " «CHECK SHEET»(ref-230070-S15069518542006042700000) ". NOTE: If "NG" is displayed on "CAN COMM" as "CAN DIAG SUPPORT MONITOR" for the diagnosed control unit, replace the control unit. Refer to " «CAN COMMUNICATION LINE CHECK»(ref-230071-S22933290422006042700000) ".
9. According to the check sheet results (example), start inspection. Refer to " «CHECK SHEET RESULTS (EXAMPLE)»(ref-230070-S02736738912006042700000) ".

CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle multiplex communication line with high data communication speed and excellent error detection ability. Many electronic control units are equipped onto a vehicle, and each control unit shares information and links with other control units during operation (not independent). In CAN communication, control units are connected with 2 communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring. Each control unit transmits/receives data but selectively reads required data only.

Scheme 203

Scheme 204

Scheme 205

Scheme 206

Scheme 207

Scheme 208

Scheme 209

Scheme 210

Scheme 211

1. When there are no indications of "AUTO DRIVE POS.", "BCM", "HVAC", "ALL MODE AWD/4WD" or "IPDM E/R" on "SELECT SYSTEM" display of CONSULT-II, print the "SELECT SYSTEM".
2. Print all the data of "SELF-DIAG RESULTS" for "ENGINE", "A/T", "ICC", "AUTO DRIVE POS.", "BCM", "HVAC", "ALL MODE AWD/4WD", "ABS" and "IPDM E/R" displayed on CONSULT-II.
3. Print all the data of "CAN DIAG SUPPORT MNTR" for "ENGINE", "A/T", "ICC", "AUTO DRIVE POS.", "BCM", "HVAC", "ALL MODE AWD/4WD", "ABS" and "IPDM E/R" displayed on CONSULT-II.
4. Attach the printed sheet of "SELECT SYSTEM", "SELF-DIAG RESULTS" and "CAN DIAG SUPPORT MNTR" onto the check sheet. Refer to " «CHECK SHEET»(ref-230070-S31110238642006042700000) ".
5. Based on the indications of "SELECT SYSTEM" and the results of "CAN DIAG SUPPORT MNTR", puts a check mark onto the items with "No indication", "NG" or "UNKWN" in the check sheet table. Refer to " «CHECK SHEET»(ref-230070-S31110238642006042700000) ". CAUTION: "ALL MODE AWD/4WD" puts a check mark on the check sheet when "Present" is "UNKWN" and "Past" is "0". NOTE: If "NG" is displayed on "INITIAL DIAG (Initial diagnosis)" as "CAN DIAG SUPPORT MNTR" for the diagnosed control unit, replace the control unit. The "CAN DIAG SUPPORT MNTR" items, which are not in check sheet table, are not related to diagnostic procedure on service manual. So it is not necessary to check the status of the "CAN DIAG SUPPORT MNTR" items not in check sheet table.
6. Check CAN communication line of the navigation system. Refer to " «CAN COMMUNICATION LINE CHECK»(ref-230071-S22933290422006042700000) ".
7. Attach the CAN DIAG SUPPORT MONITOR check sheet onto the check sheet. Refer to " «CHECK SHEET»(ref-230070-S31110238642006042700000) ".
8. Mark the "NG" or "UNKWN" item of the check sheet table with "v" from the result of CAN DIAG SUPPORT MONITOR check sheet. Refer to " «CHECK SHEET»(ref-230070-S31110238642006042700000) ". NOTE: If "NG" is displayed on "CAN COMM" as "CAN DIAG SUPPORT MONITOR" for the diagnosed control unit, replace the control unit. Refer to " «CAN COMMUNICATION LINE CHECK»(ref-230071-S22933290422006042700000) ".
9. According to the check sheet results (example), start inspection. Refer to " «CHECK SHEET RESULTS (EXAMPLE)»(ref-230070-S23583652502006042700000) ".