Tiptronic -- Diagnostics: Wiring Porsche Cayenne I

Wiring diagram of shift solenoid valve (S2)

1 - Tiptronic control module

2 - Shift solenoid valve (S2)

15 - Pin (15)

I - Current flow

Scheme 11

Wiring diagram of shiftlock solenoid

1 - Tiptronic control module

2 - Shiftlock solenoid

29 - Pin (29)

I - Current flow

Scheme 12

1. Operating voltage (max.): up to 16.5 V
2. Current input (max.): 1.2 A (at 16.5 V)
3. Default internal resistance (at 20°C): 21.2 ± 0.7 ohms
4. Default internal resistance (at -40°C): 15.8 ohms

Note. Visual inspection: In the next troubleshooting section, please check first that the affected 'pins' on the Tiptronic control module plug connection and the 'pins' on the 'existing transmission wiring' plug connection are neither damaged nor corroded. Remove any soiling or corrosion/oxidation. Replace damaged parts/wires.

Note. Control unit replacement: Before replacing the 'Tiptronic control unit', the ground connections, power supply and plug connections on the control unit must be checked as OK. Please observe the coding of the control module. After the test drive, read out the fault memory with the 9588 Porsche System Tester II again. Additional causes of faults that could damage the 'Tiptronic control module' should be detected and remedied.

1. Troubleshooting only for fault type: 'Open circuit/short circuit to B+' NOTE: The P/N lock solenoid is protected by fuse '52' in the fuse carrier at the right of the dashboard. This fuse should be checked for continuity and replaced if not OK. TROUBLESHOOTING PROCEDURE OPEN CIRCUIT/SHORT CIRCUIT TO B+ Work instruction Display OK If not OK 1 Check for short circuit to B+ in the control line between Tiptronic control unit and 'shiftlock solenoid' and in the ground lines for 'shiftlock solenoid' and 'P/N lock solenoid': Measurement '1a' Ignition off Pull plug off the Tiptronic control module Ignition on Measure voltage between 'pin 29' and ground on Tiptronic control unit plug. < 0.3 V go to measurement '1b' Repair wiring harness to Tiptronic control unit. --> End Measurement '1b' Ignition off Remove plugs from 'P/N lock solenoid' and 'shiftlock solenoid' Ignition on Measure voltage at P/N lock solenoid between 'pin A2' and ground and between 'pin A4' of shiftlock solenoid plug and ground. < 0.3 V Go to Step 2 Repair ground line(s). --> End 2 Check for open circuit with both 'Tiptronic control unit' plug and 'shiftlock solenoid' and 'P/N lock solenoid' plug disconnected: Measurement '2a' Ignition off Measure resistance between 'pin 29' on Tiptronic control unit plug and 'pin A5' on shiftlock solenoid plug. < 5 ohms go to measurement '2b' Repair wiring harness to Tiptronic control unit. --> End Measurement '2b' Measure resistance between 'Pin A4' on shiftlock solenoid plug and ground. < 5 ohms go to measurement '2c' Repair ground line(s). ohms End Measurement '2c' Measure resistance between 'pin A2' on P/N lock solenoid plug and ground. < 5 ohms go to measurement '2d' Repair ground line(s). --> End Measurement '2d' Measure resistance between 'pin A1' on P/N lock solenoid plug and fuse '52' in fuse carrier at right of dashboard. < 5 ohms Go to Step 3 Replace fuse if faulty and repair the wire. --> End 3 Check for open circuit on 'shiftlock solenoid' and 'P/N lock solenoid': Measurement '3a' Measure resistance between 'pin A4' and 'pin A5' on shiftlock solenoid. 21.2 ± 0.7 ohms (at 20°C) go to measurement '3b' Replace shiftlock solenoid. Go to Step 11 Measurement '3b' Measure resistance between 'pin A1' and 'pin A2' on P/N lock solenoid. approx. 22 ohms (at 20 °C) Go to Step 4 Replace P/N lock solenoid. Go to Step 10 4 Check 'P/N lock solenoid' for mechanical functionality: Selector lever in position 'P' Remove plug from 'P/N lock solenoid' Ignition on (Keylock unlocked) Selector lever locked Using an auxiliary cable protected with a '5 amp' fuse, at 'P/N lock solenoid' briefly connect 'pin A1' to '12 V battery voltage (approx.)' and 'pin A2' to ground. A distinct click must be heard from the 'P/N lock solenoid'. Actuate locking button on selector lever and check if the lever can be moved to 'N'. Selector lever is free Go to Step 5 Selector lever is locked Go to Step 10 5 Check 'shiftlock solenoid' for mechanical functionality: Selector lever in position 'N' Remove plug from from shiftlock solenoid Ignition on (Keylock unlocked) Selector lever free Using an auxiliary cable protected with a '5 amp' fuse, at 'P/N lock solenoid' briefly connect 'pin A5' to '12 V battery voltage (approx.)' and 'pin A4' to ground. A distinct click must be heard from the 'shiftlock solenoid'. Actuate locking button on selector lever and check if the lever can be moved to 'R or D'. Selector lever is locked Go to Step 6 Selector lever is free Go to Step 11 6 Check signal inputs from stop light switch: Use the 9588 Porsche System Tester II in the menu 'Input signals' to select the menu item 'Stop light switch' Foot brake released Foot brake actuated The following information is displayed: 'Stop light switch off' Go to Step 7 The following information is displayed: 'Stop light switch on' Go to Step 9 Go to Step 7 7 Check stop light switch: Measurement '7a' Pull plug off stop light switch and measure resistance between 'pin A2' and 'pin A3' with foot brake actuated. < 5 ohms go to measurement '7b' Replace stop light switch. --> End Measurement '7b' Measure resistance without actuating foot brake. infinity ohms Go to Step 8 Replace stop light switch. --> End 8 Check lead from stop light switch and to Tiptronic control unit: Measure open circuit and short circuit to B+ of signal line and supply line from stop light switch to Tiptronic control unit 'pin 49'. Go to Step 12 Repair lead(s). --> End 9 Check mechanical selector lever lock (Keylock) Go to Step 12 Repair Keylock. --> End 10 Replace P/N lock solenoid --> End 11 Replace shiftlock solenoid --> End 12 Replace Tiptronic control module --> End
2. Troubleshooting only for fault type: 'Short circuit to ground' NOTE: The P/N lock solenoid is protected by fuse '52' in the fuse carrier at the right of the dashboard. This fuse should be checked for continuity and replaced if not OK. TROUBLESHOOTING PROCEDURE SHORT CIRCUIT TO GROUND Work instruction Display OK If not OK 1 Check for short circuit to ground of the control line between Tiptronic control unit and 'shiftlock solenoid' and of the voltage supply for 'shift-lock solenoid': Measurement '1a' Ignition off Pull plug off the Tiptronic control module Measure resistance between 'pin 29' and ground on Tiptronic control unit plug. 21.2 ± 0.7 ohms (at 20°C) go to measurement '1c' Pull plug off 'shiftlock solenoid' and repeat measurement. See measurement '1b' Measurement '1b' Remove plug from 'shift-lock solenoid' Measure resistance between 'pin 29' and ground on Tiptronic control unit plug. infinity ohms Go to Step 2 Repair wire. --> End Measurement '1c' Remove plug from 'P/N lock solenoid' Switch on ignition Measure voltage between 'pin A1' on disconnected plug of P/N lock solenoid and ground. 11.4 to 14.5 V Go to Step 2 Replace fuse if faulty and repair the wire. --> End 2 Check for short circuit in the coil of 'shiftlock solenoid' and 'P/N lock solenoid': Measurement '2a' Measure resistance between 'pin A4' and 'pin A5' on shiftlock solenoid. 21.2 ± 0.7 ohms (at 20°C) go to measurement '2b' Go to Step 10 Measurement '2b' Measure resistance between 'pin A1' and 'pin A2' on P/N lock solenoid. approx. 22 ohms (at 20 °C) Go to Step 3 Go to Step 9 3 Check 'P/N lock solenoid' for mechanical functionality: Selector lever in position 'P' Remove plug from 'P/N lock solenoid' Ignition on (Keylock unlocked) Selector lever locked Using an auxiliary cable protected with a '5 amp' fuse, at 'P/N lock solenoid' briefly connect 'pin A1' to '12 V battery voltage (approx.)' and 'pin A2' to ground. A distinct click must be heard from the 'P/N lock solenoid'. Actuate locking button on selector lever and check if the lever can be moved to 'N'. Selector lever is free Go to Step 4 Selector lever is locked Go to Step 9 4 Check 'shiftlock solenoid' for mechanical functionality: Selector lever in position 'N' Remove plug from shiftlock solenoid Ignition on (Keylock unlocked) Selector lever free Using an auxiliary cable protected with a '5 amp' fuse, at 'P/N lock solenoid' briefly connect 'pin A5' to '12 V battery voltage (approx.)' and 'pin A4' to ground. A distinct click must be heard from the 'shiftlock solenoid'. Actuate locking button on selector lever and check if the lever can be moved to 'R or D'. Selector lever is locked Go to Step 5 Selector lever is free Go to Step 10 5 Check signal inputs from stop light switch: Use the 9588 Porsche System Tester II in the menu 'Input signals' to select the menu item 'Stop light switch' Foot brake released Foot brake actuated The following information is displayed: 'Stop light switch off' Go to Step 6 The following information is displayed: 'Stop light switch on' Go to Step 8 6 Check stop light switch: Pull plug off stop light switch and measure resistance on 'pin A2' and 'pin A3' with foot brake actuated. < 5 ohms Replace stop light switch. --> End Measure resistance without actuating foot brake. infinity ohms Go to Step 7 Replace stop light switch. --> End 7 Check lead from stop light switch and to Tiptronic control unit: Measure short circuit to ground of signal line and supply line from stop light switch to Tiptronic control unit 'pin 49'. Go to Step 11 Repair wiring. --> End 8 Check mechanical selector lever lock (Keylock) Go to Step 11 Repair Keylock. --> End 9 Replace P/N lock solenoid --> End 10 Replace shiftlock solenoid --> End 11 Replace Tiptronic control module --> End