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SLM / P1802 05

Read the instructions below then start the fault diagnostic procedure.

Symptom: No Sentronic function. Selector lever locked in position P or N.

  P1802 05


Sentronic Circuit, Open/Short to B+.

Fault symptom

No Sentronic function.

Selector lever locked in position P or N.

On-board diagnosis

Type of diagnosis:

Continuous

Enable criteria:

Ignition ON.

Fault criteria:

Control module output voltage exceeds 4.8 V.

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.
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IMPORTANT
This diagnostic trouble code is also generated when the TCM's bus communication was/is faulty.
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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:

Test value:
Selector Position Sentronic
Selector Position Sentronic Up
Selector Position Sentronic Down
Shift Lever Sentronic