TCM T8 / P0725 71
Symptom: Gearbox warning lamp lights in MIU.
Message appears in display.
Limited shifting function.
Engine Speed. Bus Data Unreliable
Fault symptom
Gearbox warning lamp lights in MIU.
Message appears in display.
Limited shifting function.
On-board diagnosis
Type of diagnosis:
Enable criteria:
| Input shaft speed exceeds 500 rpm. |
| No bus communication fault with engine management system. |
| "Limp home" function not active. |
Fault criteria:
| Incorrect engine speed signal from engine management system for more than 4 s. |
System reaction to a fault:
OK report:
| Engine speed signal valid for more than 5 min. |
Diagnostic help
If engine management system self-diagnostics detects a fault on the crankshaft position sensor, the speed signal on the bus becomes invalid. When the engine management system approves the speed signal, the correct value is transmitted on the bus. When P0725 71 is generated in TCM, DTC P0335/P0336/P0337/P0339 is stored in the engine management system.
Follow the fault tracing procedure for the DTC in question in the engine management system.
