WIS Document: 4639

| | P1790 Kick-down switch, shorted to ground. Fault symptom No downshifting for fast acceleration Condition Shorting to ground at the same time as the throttle position is less than 70%% for at least 2 seconds. Diagnostic help A reading of the kickdown switch status can be obtained with the diagnostics instrument. Select "READ ON/OFF". Select "KICKDOWN SWITCH". With the accelerator fully depressed, i.e. in the kickdown position, the diagnostics instrument will show ON, otherwise OFF. Diagnostic procedure 1 Check the transmission control module's signal input | - | Unplug the kick-down switch connector. | - | Connect the Scan tool diagnostics instrument. | - | Turn the ignition switch to the ON position. | - | Select "READ ON/OFF". | - | Select ""KICKDOWN SWITCH". Read the diagnostics instrument with | • | connector pin 1 open "OFF" | • | connector pin 1 connected to a good grounding point "ON" Is the diagnostics instrument reading correct? | yes Continue with point 3. | no Rectify the lead (including connector) between the kickdown switch connector pin 1 and the control module pin 8 and continue with step 2. 2 Check the kick-down switch's connection to ground | - | Turn the ignition switch to the ON position. | - | Connect a test lamp to pins 1 and 2 of the connector. The lamp should light up. Did the test lamp light up? | yes Adjust or, if necessary, replace the kick-down switch and continue with point 3. | no Rectify the lead (including connector) between the kickdown switch connector pin 2 and grounding point G4, and continue with step 3. 3 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.