TCM T8 / P0828 01
Read the instructions below then
start the fault diagnostic procedure.
Symptom: No Sentronic function.
Selector lever locked in position P or N.
Sentronic Circuit, Short to B+
Fault symptom
No Sentronic function.
Selector lever locked in position P or N.
On-board diagnosis
Type of diagnosis:
Enable criteria:
| Engine running and not in limp home mode. |
| System voltage should be 9 - 16 V. |
Fault criteria:
| Input voltage exceeds 6.7 +/- 0.8 V for more than 30 s. |
System reaction to a fault:
| Manual shifting not permitted. |
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 in lead connected between SLM and TCM. |
| ____________________________________ |
| If this DTC is stored, DTC P1802 02 or P1802 05 should also be stored in SLM. Otherwise, it is an indication that SLM is not communicating on the I-bus. |
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| If the selector lever is moved to position M, SLM transmits a bus message. TCM is then open to up or downshifting. If the driver shifts manually, voltage is sent from pin 7 on SLM to pin 8 (A) on TCM. This is done through an analogue voltage signal sent by SLM on its own lead directly to TCM in accordance with the following: |
| • | Hold Gear voltage between 0.5 V - 1.4 V |
| • | Shift Gear -UP, (+) voltage between 1.4 V - 1.79 V |
| • | Shift Gear-DOWN (-) voltage between 2.7 V - 3.5 V |
| (These voltage levels can be measured when all contacts are engaged.) |
Functions in the diagnostic tool related to the fault:
| • | Selector Position Sentronic |
| • | Selector Position Sentronic Up |
| • | Selector Position Sentronic Down |
