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P1817

Symptom: CHECK GEARBOX indicator lamp on. The system's emergency operation program has been activated. No input shaft speed data results in rough shifting and imperfect operation of the lock-up function.

P1817

Input shaft speed sensor, no input to transmission control module

Fault symptom

CHECK GEARBOX indicator lamp on. The system's emergency operation program has been activated. No input shaft speed data results in rough shifting and imperfect operation of the lock-up function.

Condition

No signal from the inductive sensor and car speed exceeds 4 km/h (2.5 mph).

Diagnostic help

A transmission input shaft speed reading can be obtained with the diagnostics instrument. Select "READ FUNCTIONS". Select "INPUT RPM". Compare the diagnostics instrument reading with that of the tachometer.

Check the wiring

Intermittent faults may occur as a result of temporary short circuits and breaks in the wiring. Jiggle the leads at several places and in different directions to reveal any faults in the wiring harness, including connectors. Observe the multimeter, test lamp or ISAT scan tool while carrying out this check.

Diagnostic procedure

1 Check the input shaft speed sensor's connection to ground



Unplug the input shaft speed sensor's connector (mounted on the transmission) and connect a test lamp to the connector pin with the green (GN) lead and to battery positive (B+).

Did the test lamp light up?

yes

Continue with point 3.


no

Continue with point 2.


2 Check the input shaft speed sensor's connection to ground (contd.)


Unplug connector H16-3 (located behind the battery) and connect a test lamp to pin 13 of the female connector and to battery positive (B+).

Did the test lamp light up?

yes

Repair or replace the wiring (including connectors) between the input shaft speed sensor's connector (the pin with the green (GN) lead) and pin 13 of female connector H16-3. Then proceed to point 6.


no

Check and, if necessary, repair or replace the wiring between pin 13 of female connector H16-3 and pin 31 of the transmission control module. If the wiring is OK, proceed to point 6.


3 Check the transmission control module's signal input


Take a resistance reading across the pins of the connector. The resistance should be about 2.2 Kohms.

Is the resistance correct?

yes

Continue with point 5.


no

Continue with point 4.


4 Check the transmission control module's signal input (contd.)


Unplug connector H16-3 (16-pin connector located behind the battery) and take a resistance reading across pins 13 and 5 of the female connector. The resistance should be about 2.2 Kohms.

Is the resistance correct?

yes

Repair or replace the wiring (including connectors) between the input shaft speed sensor's connector (pin with yellow/black (YE/BK) lead - female connector pin marked 22) and pin 5 of male connector H16-3. Proceed to point 6.


no

Check and, if necessary, repair or replace the wiring between pin 5 of female connector H16-3 and pin 12 of the transmission control module. If the wiring is OK, proceed to point 6.


5 Check the input shaft speed sensor





- Make a visual check of the sensor's mounting and general condition - dirtiness, etc.

- Check the connector for moisture and corrosion.

- Check the mounting of the sensor on the transmission.

- Dismantle the sensor and check that its tip is not soiled by metal filings, shavings, etc.


Any visible defects?

yes

Clean the connector and brush away any metal shavings, etc. Fit the sensor correctly, see and continue with point 6.


no

Change the input shaft speed sensor, see , and continue with step 6.


6 Final check


Clear the diagnostic trouble code, drive the car on test at varying engine loads and speeds for 5 minutes and obtain readouts of any diagnostic trouble codes that are generated.

Does the diagnostic trouble code recur?

yes

Continue with .


no

The remedial action taken was correct.