WIS Document: 4873

| | P1790 Kickdown switch, short circuit to ground Fault symptoms No downshifting when accelerating quickly. Conditions Short circuit to ground while throttle position is less than 70%% for at least 2 seconds. Diagnostic help The status of the kick-down switch can be read with the diagnostic tool. Select "READ ON/OFF". Select "KICK-DOWN SWITCH". When the accelerator pedal is fully depressed, i.e. kick-down, ON will be displayed, otherwise OFF. Diagnostic procedure 1 Check the control module signal input | - | Unplug the kickdown switch connector. | - | Connect the diagnostic tool. | - | Turn the ignition to the ON position. | - | Select "READ ON/OFF". | - | Select "KICK-DOWN SWITCH". Read off the diagnostic tool with | • | connector pin 1 open "OFF" | • | connector pin 1 connected to a good grounding point "ON" Is the diagnostic tool reading correct? | yes Continue with step 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 kickdown switch ground connection | - | Turn the ignition to the ON position. | - | Connect a test lamp between connector pins 1 and 2. The lamp should light up. Is the lamp alight? | yes Adjust or, if necessary, replace the kickdown switch and continue with step 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.