A/T - Delayed Shift Neutral to Drive/Neutral to Reverse

87mitsubishi03

SUBJECT:

KM 175 TRANSAXLE - DELAYED SHIFT - N-D OR N-R
NO. STB-87-21-006

DATE March, 1987

MODEL 1987 Galant
PURPOSE

This bulletin contains information on a delayed-shift condition that may occur in some Galant automatic transaxles and the recommended corrective action.

SYMPTOM

1. Delayed shift from "N" to "D" or "R" - 1.5 to 3 seconds.

2. Engine "flares", followed by harsh transmission engagement when shifted from "N" to "D" or "R".
3. No drive when shifted from "N" to "D".

CAUSE

The center of the relief spring hole in the valve body is misaligned, with the result that the steel ball which acts as a spring-loaded valve does not seat completely, causing fluid leakage past the ball.

FIGURE 1:

DIAGNOSIS

Positive diagnosis of this condition can be made by checking the reducing pressure. Fig. 1 shows the location of pressure tap. If reducing pressure vades considerably and is consistently below the recommended range of 48-71 psi in N fully warmed-up, then the valve is leaking.

Test the pressure first in N at Idle and then at 2500 rpm, then in "D" and "R" at idle and 2500 rpm. Record the pressure readings.
CORRECTIVE ACTION

Replace the valve body with Part No. MD726625

WARRANTY INFORMATION

Normal warranty procedures apply.