GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2007 🢒 Optra 🢒 Safety and Security 🢒 Supplemental Inflatable Restraints 🢒 DTC P1853

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 ground.
    • No DTCs P1854 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 by hydraulic control.
    • After the ignition is OFF/ON: 3rd gear by hydraulic control. P, R, and N also possible.

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 P1853 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. Record, then clear the DTCs.
  4. Select Actuating on the scan tool.
  5. Actuate solenoid 2 ON/OFF.

Does the solenoid 2 change ON/OFF?

--

Go to Diagnostic Aids

Go to Step 3

3
  1. Turn the ignition OFF.
  2. Disconnect the transaxle wiring connector.
  3. Measure the resistance between terminals 3 and 12 of the transaxle wiring connector.

Is the resistance within the specified values?

TFT 25°C (77°F)

26-34.5 ohms

Go to Step 7

Go to Step 4

4
  1. Remove the oil pan.
  2. Disconnect the wiring connector of solenoid 2.
  3. Measure the resistance between terminal 2 of solenoid 2 and ground.
  4. Measure the resistance between terminal 1 of solenoid 2 and ground.

Is the resistance within the specified value?

∞ohms

Go to Step 6

Go to Step 5

5

Repair the internal line, solenoid 2, for a short to ground.

Did you complete the repair?

--

System OK

--

6

Replace the solenoid 2.

Did you complete the replacement?

--

System OK

--

7
  1. Disconnect the transaxle wiring connector and transmission control module (TCM) connector.
  2. Measure the resistance between terminal 3 of the transaxle wiring connector and ground.
  3. Measure the resistance between terminal 13 of the transaxle wiring connector and ground.

Is the resistance within the specified value?

∞ohms

Go to Step 9

Go to Step 8

8

Repair the transaxle wiring harness for short to ground.

Did you complete the repair?

--

System OK

--

9

Replace the TCM. Refer to Transmission Control Module Replacement .

Did you complete the replacement?

--

Go to Step 10

--

10
  1. Clear the DTCs with a scan tool.
  2. Road test the vehicle.
  3. Observe the DTC information with a scan tool.

Are there any DTCs displayed that have not been diagnosed?

--

Go to Step 2

System OK