For 1990-2009 cars

### Circuit Description

The 1-2 shift solenoid valve controls fluid flow acting on the 1-2 shift valve. The solenoid is a normally open valve that along with the 2-3 shift solenoid, allows four different shifting combinations. The 1-2 shift solenoid is attached to the valve body inside the transaxle. The transaxle control module (TCM) switches ignition voltage to power the solenoid and commands the solenoid ON and OFF by providing a ground path through circuit 1222.

When a TCM detects a continuous open or short to ground in the 1-2 SS Valve, DTC P1842 sets. DTC 1842 is a type A DTC.

### Conditions for Setting the DTC

DTC P1842 will set if there is a continuous open or short to ground in the 1-2 shift solenoid valve circuit when:

• | Engine speed is greater than 500 rpm for 5 seconds

• | System voltage is between 8 and 18 volts

• | DTC P1831 or 1833 is not set

### Diagnostic Aids

Inspect the wiring at the TCM, the transaxle connector, the 1-2 SS shift solenoid 2-way connector, and all other circuit connecting points for the following conditions:

• | A bent terminal

• | A backed out terminal

• | A damaged terminal

• | Poor terminal tension

• | A chafed wire

• | A broken wire inside the insulation

• | Moisture intrusion

• | Corrosion

When diagnosing for an intermittent short or open condition, massage the wiring harness while watching the test equipment for a change.

#### Shift Solenoid State Table

Gear | 1-2 Shift Solenoid Valve | 2-3 Shift Solenoid Valve
--- | --- | ---
1st | ON | OFF
2nd | OFF | OFF
3rd | OFF | ON
4th | ON | ON

### DTC P1842