Hyundai Elantra: Dual Clutch Transmission Control System / Inhibitor Switch
Description and operation
| •
| The inhibitor switch is installed on top of transmission, and is connected to the shift lever through shift cable. |
| •
| Inhibitor switch signals (S1, S2, S3, S4) are transmitted to the TCM according to the driver's shift lever control. 
|
Specifications
Item
|
Specification
|
Power supply
| 12V
|
Output type
| Combination of output signals
|
|
P
|
Pst (P - R)
|
R
|
Nst (R - N)
|
N
|
N-D
|
D
|
Signal "1"
| 12V
| 12V
| 0
| 0
| 0
| 0
| 0
|
Signal "2"
| 0
| 12V
| 12V
| 12V
| 0
| 0
| 0
|
Signal "3"
| 0
| 0
| 0
| 12V
| 12V
| 12V
| 0
|
Signal "4"
| 0
| 0
| 0
| 0
| 0
| 12V
| 12V
|
Components and components location
1. Inhibitor switch
| 2. Manual control lever
|
Troubleshooting
| Fault Diagnosis for Symptom |
Major Symptom
|
Expected Cause
|
Items to Check and Measures
|
Shift lever not operating
Gear not marked on cluster
Shock occurs while shifting lever Warning lamp ON
Engine OFF while vehicle is parked
| Inhibitor switch circuit abnormal
Inhibitor switch function abnormal
| Check the inspection FLOW and replace the inhibitor switch
|
Inhibitor switch "N" setting faulty
| Adjust "N" setting using "N" setting jig (refer to automatic transmission system - "inhibitor switch")
|
Shift cable separation faulty
| Adjust shift cable separation (refer to automatic transmission system - "inhibitor switch")
|
Poor ground condition on reversing light circuit
| Check the ground condition on reversing light and retighten it
|
Inhibitor switch vehicle side circuit abnormal
| Check the connection of junction box power terminal, fuse (TCU2) terminal and replace the junction box or adjust the gap
|
Check inside the inhibitor switch connector for foreign substance and whether terminal is bent
|
Poor ground condition on inhibitor switch wire
| Check the ground condition of wire and retighten it
|
Poor inhibitor unit (disconnection/short-circuit)
| Replace inhibitor switch (refer to inhibitor switch inspection)
|
Repair procedures
| •
| Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. |
|
Inspection flow
Items to check
| 2. | Inspect whether N setting matches. | –
| Adjust N setting (refer to automatic transmission system - "inhibitor switch") |
|
| 3. | Inspect shift cable separation. | –
| Adjust shift cable separation (refer to automatic transmission system - "shift cable") |
|
| 4. | Inspect whether connector is connected. | –
| Inspect connector thoroughly for looseness, poor connection, bending, corrosion, contamination, deformation, or damage. |
| –
| Turn ignition key "ON" and engine "OFF" and measure the power supplied to inhibitor switch circuit and voltage between ground. Specification : approx. 12 V |
|
| –
| Fix the pin wiring when connector pin wiring is faulty (refer to ETM - "wiring repair"). |
|
| 5. | Inspect ground condition on reversing light circuit. | –
| Check the ground location of reversing light (refer to ETM - "harness location map"). |
| –
| Reattach reversing light if ground condition is faulty. |
|
| 6. | Inspect wiring connection on junction box power terminal and fuse lamp. | –
| Check whether fuse holder is separated and holder is holding the fuse tight. 
|
| –
| Attach tester fuse to check if it is connected appropriately. 
|
| –
| Check whether fuse capacity is appropriate for each circuit. |
| –
| Check if fuse is damaged. |
| –
| Check pulling of fuse fixing wiring, inflow of foreign substance, and arrangement condition of terminal. |
| –
| Relocate the terminal that has been pulled and inspect using the method explained above. |
| –
| When problem is not solved, refer to the circuit diagram wiring repair instructions to fix or replace the terminal. |
|
| 7. | Inspect inhibitor switch signal. | –
| Turn ignition key "ON" and engine "OFF". |
| –
| Measure the voltage between each terminal and chassis ground when shifting lever to "P, R, N, D" range. Specified value: refer to specification "signal code" table |
|
|
| 1. | Make sure vehicle does not roll before setting shift lever to "N" position. |
| 2. | Turn ignition switch OFF and disconnect the battery negative (-) terminal. |
| 3. | Remove the air cleaner assembly and air duct. (Refer to Engine Mechnical System - "Air cleaner") |
| 4. | Disconnect the inhibitor switch connector (B). 
|
| 5. | Loosen the shift cable mounting nut (A). 
|
| 6. | Loosen the manual lever mounting nut (A) and inhibitor swtich mounting bolts (B) and then remove the inhibitor switch (C). 
|
| 1. | Check that the shift lever is placed in the "N" position. |
| 2. | Lightly tighten the inhibitor switch mounting bolts after installing the inhibitor switch (A). 
|
| 3. | Lightly tighten the manual control lever mounting nut (B) after installing the manual control lever (A). 
|
| 4. | Align the hole in the manual control lever with the "N" position hole of the inhibitor switch and then insert the inhibitor switch guide pin (SST No. : 09480 - A3800) (A) in the matched hole. 
|
| 5. | Tighten the nut (A), bolts (B) with the specified torque. Tightening torque : (A) 17.7 - 24.5 N.m (1.8 - 2.5 kgf.m, 13.0 - 18.1 lb-ft) (B) 9.8 - 11.8 N.m (1.0 - 1.2 kgf.m, 7.2 - 8.7 lb-ft) |
|
| 6. | Lightly tighten the nut (A) after connected the shift cable in the manual control lever. |
| 7. | Push shift cable lightly to "F" direction shown to eliminate free play of shift cable. |
| 8. | Tighten the nut (A) with the specified torque. Tightening torque : 9.8 - 13.7 N.m (1.0 - 1.4 kgf.m, 7.2 - 10.1 lb-ft) |
|
| 9. | Connect the inhibitor switch connector (A). 
|
| 10. | Remove the inhibitor switch guide pin (SST No. : 09480-A3800) from the hole. 
|
| 11. | Install the air cleaner and air duct. (Refer to Engine Mechanical System - "Air Cleaner") | •
| Check that operating surely at each range of the inhibitor switch corresponding to each position of shift lever. |
|
|
Description and operation
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Shift Lever.png)
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