Hyundai Creta: Automatic Transaxle Control System / Inhibitor Switch

Description and operation

Description
The inhibitor switch mounted on the upper of transaxle and connected with shifter lever.
The inhibitor switch has four points of contact and it makes the signals (S1, S2, S3, S4).
The inhibitor switch signals delivered at the TCM according to control of the shift lever positions (P, R, N, D) and it is used to control of the gear setting.

Specifications

Specifications
▷ Type: Combination of output signals from 4 terminals
Power supply (V)
12
Output type
Combination of output signals

Signal Code Table

P
P-R
R
R-N
N
N-D
D
S1
12V
12V
0
0
0
0
0
S2
0
12V
12V
12V
0
0
0
S3
0
0
0
12V
12V
12V
0
S4
0
0
0
0
0
12V
12V

Schematic diagrams

Circuit Diagram

Troubleshooting

Fault Diagnosis
Fault Diagnosis for Symptom
Major Symptom
Expected Cause
Items to Check and Measures
Shift lever inoperable
Faulty shift cable tension
Adjust shift cable tension
(refer to "Automatic Transaxle System – Inhibitor Switch")
Faulty shift cable assembly/connection
Check manual control valve assembly and re-assemble if necessary.
Faulty shift cable bracket installation
Check cable installation on the shift lever assembly and repair if necessary.
Shock when shifting to and from D/R

Motor run-up when shifting to and from D/R
Faulty inhibitor switch "N" setting
Use the "N" setting jig and adjust the "N" setting.
(refer to "Automatic Transaxle System – Inhibitor Switch")
Faulty oil pressure in the valve body.
Replace valve body assembly or inspect/replace transaxle assembly
Faulty engine start

Current gear not indicated in the Cluster

Warning Lamp ON

Engine stall while stopped

Creeping not possible

Auto parking release disabled
Faulty CAN terminating resistance/circuit
Check PCU/battery management system module.
Check PCU wiring connector connection.
Faulty power supply (IG.1) to inhibitor switch circuit
Check for gap on the junction box power terminal in the engine compartment and fuse (TCU2) connection. Repair terminal or exchange junction box if necessary.
Faulty inhibitor switch circuit fuse
Check fuse and junction box terminal, and repair.
Faulty inhibitor switch wiring connector
Check for foreign substance in the wiring connector, and check for gap on the terminal.
Check sealing on unused pin, and check for corrosion on the terminal.
Faulty reverse lamp circuit
Check reverse lamp ground, and reassemble if necessary.
Faulty inhibitor switch wiring ground
Check wiring ground, and reassemble if necessary.
Faulty inhibitor switch circuit (unused code)
Inspect in accordance with the inspection flow, then replace inhibitor switch if necessary.
Faulty inhibitor switch operation (faulty mid-range)
Inspect in accordance with the inspection flow, then replace inhibitor switch if necessary.

Repair procedures

Inspection
Inspection flow of the inhibitor switch

Items to check
1.
Inspect DTC code.
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. 12V
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
Removal
1.
Make sure vehicle does not roll before setting shift lever to "N" position.
2.
Disconnect the negative (-) battery cable.
3.
Remove the air cleaner assembly and air duct.
(Refer to Engine Mechanical System - "Air cleaner")
4.
Remove the battery and battery tray.
(Refer to Engine Electrical System - "Battery")
5.
Disconnect the inhibitor switch connector (A).
6.
Remove the shift cable mounting nut (B).

7.
Remove the manual control lever (B) and the washer after removing a nut (A).

8.
Remove the inhibitor switch (A) after removing the bolts (2ea).

Installation
1.
Check that the shift lever is placed in the "N" position.
2.
Lightly tighten the bolts (A) after installing the inhibitor switch (B).

3.
Lightly tighten the nut (A) after installing the manual control lever (B).

4.
Align the hole (A) in the manual control lever with the "N" position hole (B) of the inhibitor switch and then insert the inhibitor switch guide pin (SST No.: 09480-A3800).

5.
Tighten the nut (A) and 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 (B) after connected the shift cable (C) in the manual control lever (D).
7.
Push shift cable (C) lightly to "F" direction shown to eliminate free play of shift cable.
8.
Tighten the nut (B) with the specified torque.
Tightening torque :
9.8 ~ 14.7 N.m (1.0 ~ 1.5 kgf.m, 7.2 ~ 10.8 lb-ft)

9.
Remove the inhibitor switch guide pin (SST No.: 09480-A3800) from the hole.
10.
Connect the inhibitor switch connector (A).

11.
Install the battery and battery tray.
(Refer to Engine Electrical System - "Battery")
12.
Install the air cleaner assembly and air duct.
(Refer to Engine Mechanical System - "Air cleaner")
13.
Connect the battery negative (-) cable.
14.
Check that operating surely at each range of the inhibitor switch corresponding to each position of shift lever.
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