DTC 124

EAH. Code 1-2-4

1-2-4 Short-circuit to ground in mode selector circuit

DTC information






Conditions for DTC The driving mode selector allows the driver to select from three modes: Winter (W), Economy (E) and Sport (S). The mode selector has two signal wires, MS1 and MS2, and a ground wire. The choice between W, E and S modes is made through the connection of either one or the other, or both signal wires to ground (the signal goes low). Note that MS1 and MS2 signal wires are grounded simultaneously only when the W button is depressed.

battery voltage
ground (U low)

If the TCM registers that the signal is low (low voltage) in both signal wires simultaneously for at least 30 seconds, the DTC 1-2-4 is set.

NOTE: It follows that this DTC can be set if the W button is depressed for more than 30 seconds.

Substitution value

The transmission will only operate in driving mode Economy (E).


Defect cause

- Short circuit to ground in the signal wiring
- The W button has been depressed for more than 30 seconds.
- Defective mode selector.

Fault symptom
- The gear box operates in driving mode E regardless of the position selected on the driving mode selector.

- Fault-tracing starts with EAH1.







EAH1

Checking driving mode selector






- Ignition ON.
- Set gearshift selector to position P.

Check that all positions of the driving mode selector are operative by using Diagnostic Test Mode 2. Diagnostic Test Mode 2

If all positions are OK:
- Intermittent fault. Fault-tracing as per EAH5.

If not all the positions are operative:
- Checking the driving mode selector controls EAH2.



EAH2

Checking the driving mode selector controls

- Ignition OFF
- Remove driving mode selector from the center console as per AA1.

Check that the controls for the selector operate smoothly and do not stick down. Take special care that the W button does not stick down in the depressed position and operates smoothly without catching.

Shake the driving mode selector and check there are no loose parts in the switches.

If driving mode selector is OK
- Checking driving mode selector resistance EAH3.

If the driving mode selector is defective or the controls do not operate smoothly without sticking:
- Try a new driving mode selector module as per AA1-AA2.



EAH3

Checking the driving mode selector's resistance






- Ignition OFF
- Disconnect the driving mode selector

Connect an ohmmeter between the driving mode selector's connector terminals:
- 3 and 5 with the mode selector in position E
- 2 and 5 with the mode selector in position S
- 2 and 3 with the W button up.

The ohmmeter should read infinite resistance for all readings.

If reading is OK:
- Checking signal wiring MS1 EAH4.

If any reading is incorrect:
- Try a new driving mode selector module as per AA1- AA2.



EAH4

Checking signal wiring (MS1)






- Ignition OFF
- Disconnect TCM
- Driving mode selector disconnected.

Connect an ohmmeter between the driving mode selector connector terminal 3 and 5 (TCM side).

The ohmmeter should read infinite resistance.

If reading is OK:
- Check the cable between the driving mode selector connector terminal 2 and the TCM #B16 for short circuit to ground as per FA3. FA. Checking Wiring and Connections

If reading is incorrect:
- Check the cable between the driving mode selector connector terminal 3 and the TCM #B17 for short circuit to ground as per FA3. FA. Checking Wiring and Connections



EAH5

Intermittent Fault.

Checking wiring and connections





- Check W button does not stick down in the depressed position and operates smoothly without catching. Correct faults if any.

- Check the cable between the driving mode selector connector terminal 3 and the TCM #B17 for intermittent short circuit to ground as per FA3. FA. Checking Wiring and Connections

- Check the cable between the driving mode selector connector terminal 2 and the TCM #B16 for intermittent short circuit to ground as per FA3.