For 1990-2009 cars

### Circuit Description

The shift solenoids are 2 identical, normally open electronic exhaust valves that control upshifts and downshifts in all forward gear ranges. These shift solenoids work together in a combination of ON and OFF sequences to control the line pressure and shift mechanisms, such as clutches and brakes.

Solenoid 1 controls the high or low of the line pressure, the flow to each clutch valve, by the operation type, ON/OFF. For example, if solenoid 2 is ON, the line pressure will be low, 599-799 kPa (87-116 psi). If solenoid 1 is OFF, the line pressure will be high, 1 599-1 799 kPa (232-261 psi). Solenoid 2 controls the oil flow to the clutch valve E or the lock-up clutch valve by the ON/OFF signal.

The transmission control module (TCM) monitors numerous inputs to determine the appropriate solenoid state combination and transaxle gear for the vehicle operating conditions.

### Conditions for Setting the DTC

• | The solenoid wiring is shorted to power.

• | No DTCs P1853 or P1855 are set.

### Action Taken When the DTC Sets

• | The malfunction indicator lamp (MIL) will illuminate.

• | The TCM will record operating conditions at the time the diagnostic fails. This information will be stored in the Failure Records buffer.

• | Adopt Emergency/Substitute mode and constant 4th gear.

### Conditions for Clearing the Hold Lamp/DTC

• | The MIL lamp will turn OFF when the malfunction has not occurred after 3 ignition cycles.

• | A history DTC will clear after 40 consecutive warm-up cycles without a fault.

• | Using a scan tool can clear history DTCs.

### Diagnostic Aids

When DTC P1854 sets, the possible cause of the fault could be solenoid 2.

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | Go to Diagnostic System Check - Vehicle
2 |

1. Install the scan tool.
2. Turn the ignition ON, with the engine OFF.
3. Select Actuating on the scan tool.
4. Actuate solenoid 2 ON/OFF.

Does the solenoid 2 change ON/OFF?

--

Go to Diagnostic Aids

Go to Step 3

3 |

1. Remove the oil pan.
2. Disconnect the wiring connector of solenoid 2.
3. Turn the ignition ON, with the engine OFF.
4. Measure the voltage of the solenoid 2 wiring connector terminal 1.

Is the voltage within the specified value?

11-14 V

Go to Step 4

Go to Step 5

4 | Repair the internal line, solenoid 2, for a short to power. Did you complete the repair? | -- | System OK | --
5 | Replace the solenoid 2. Did you complete the replacement? | -- | Go to Step 6 | --
6 | Check if any DTCs are set. Are there any DTCs displayed that have not been diagnosed? | -- | Go to Diagnostic Trouble Code (DTC) List - Vehicle | System OK