DTC 212

EB. DTC 2-1-2
2-1-2 Short-circuit to supply in solenoid S2 circuit

Principle of operation

Solenoid S2 performs gearshifting in combination with solenoid S1. The solenoid operates when supplied with battery voltage from the TCM, which delivers an upshifting or downshifting signal depending on the speed of the car and the selected driving mode.

Fault description

A short-circuit has occurred at some point in the solenoid S2 circuit and the solenoid is energized permanently, preventing it from performing gearshifting. The emergency limp-home program is activated and the transmission operates only in 4th gear. The MIL on the panel lights.
Troubleshooting should indicate if the short-circuit is in the wiring or TCM.





Circuit description

The circuit consists of the TCM, a number of connectors and solenoid S2 in the transmission.





1
Testing solenoid S2 in test mode 4

- Move gear selector lever to position P.

Test solenoid S2 in test mode 4 use stethoscope to hear solenoid click more clearly. Displaying & Reading Trouble Codes

- If solenoid does not click, fault is permanent.
- If solenoid clicks, fault is occurring only intermittently under particular conditions, making it considerably more difficult to locate.





2
Measuring voltage with TCM disconnected

- Switch off ignition.
- Connect break-out box to wiring only.
- Switch on ignition.

Measure voltage across terminals # 9 (S2) and # 12 (SG).

- If instrument indicates 0 V, wiring is OK. Proceed to step 4.
- If instrument indicates battery voltage, short-circuit is between lead and other live lead. Proceed to step 3.





3
Measuring voltage with connector open

- Ignition still on and break-out box (BOB) connected as in previous step.
- Open connector E at transmission.

Repeat measurement across terminals # 9 (S2) and # 12 (SG).

- If instrument indicates battery voltage, fault is in wiring between connector E and TCM. Troubleshoot wiring and connections as described in Testing and Inspection. Component Tests and General Diagnostics

- if instrument indicates 0 V, fault is in harness between connector E and solenoid S2. Replace harness.

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4
Measuring voltage with TCM in circuit

- Switch off ignition.
- Connect break-out box between TCM and wiring.
- Select driving mode E and operate W button as per table below.
- Move gear selector lever to position D.
- Switch on ignition.





Measure voltage across terminals # 9 (82) and # 12 (SG).
If readings are OK, proceed to "5".

5
Conclusions

- Steps 2 and 4 correct - intermittent fault
- Step 2 incorrect - fault in wiring
- Step 2 correct and step 4 incorrect - fault in TCM

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