T8 / P1623 00
Read the instructions below then
start the fault diagnostic procedure.
Symptom: Fault indicator lamp (for further information see WIS Fault diagnosis, general)
Message appears in display.
Limp home
TCM Missing on BUS
Fault symptom
Fault indicator lamp (for further information see WIS Fault diagnosis, general)
Message appears in display.
Limp home
On-board diagnosis
Type of diagnosis:
Enable criteria:
| Ignition on for at least 3 s. |
| Battery voltage must be between 6 - 18 V. |
Fault criteria:
| No communication with TCM for 1.25 s. |
Dependent:
System reaction to a fault:
| Torque limited to max. 170Nm. |
OK report:
| Fault criteria NOT fulfilled for 2 s. |
Fault handling:
| CHECK ENGINE off and any DTC are immediately cleared as soon as TCM no longer requests CHECK ENGINE. |
| (See section Fault handling III, "Other emission-related components and functions" for more information.) |
Checking the wiring harness
Move the wiring harness at several spots and in several directions to reveal intermittent breaks and short-circuits. Check switches, connectors and crimp connections for oxidation, retracted pins and pin clamping force.
Diagnostic help
Diagnosis regards:
| Electrical fault on bus leads or in the component. |
| Fault diagnosis for automatic transmission (TCM) should be carried out. |
Functions in the diagnostic tool related to the fault:
| Response test, under "All/Bus" menu. |
| Read / Reset Bus Configuration |
| Read / Clear Bus Off Counter |
