For 1990-2009 cars

# Information on Seki Automatic Transaxle Shift Concerns

Subject: | Information on Seki Automatic Transaxle Shift Concerns

Models: | 1987-92 Chevrolet Sprint

| 1987-92 Pontiac Firefly

| 1993-97 GEO Metro

This information provides additional diagnostics to aid in diagnosing shift concerns on the Seki automatic transaxle and identifies the most common failure types resulting in any of the following shift complaints:

• | 3rd gear start

• | No up-shift

• | 1st gear only

• | No 2nd gear

The most common failure types are the Vehicle Speed Sensor (VSS) in the transaxle, shift solenoids, valve body or related wiring.

Important: During Preliminary inspection, note any installed aftermarket accessories and beware that certain aftermarket accessories or improper installation techniques may also cause these symptoms.

To help isolate if the fault is the external wiring or within the transaxle, perform the following procedure:

1. Disconnect the electrical connector on the transaxle (connector is located beside the battery).
2. Road test and manually shift the transaxle.

• | If transaxle shifts properly, suspect the transaxle external wiring and verify electrical connections

• | If transaxle does not shift properly, suspect an internal mechanical failure such as a valve body or other failed internal component

The most common "external" type failures for the following conditions are:

#### No Up-Shift / 1st Gear Only

Check VSS in the transaxle.

#### 3rd Gear Start

• | Check shift solenoids and TPS for proper operation and readings.

• | Verify wiring from PCM to ATCM (Automatic Transmission Control Module).

• | If all checks good the VSS in the transaxle may be the cause.