NO.22 NO ENGINE BRAKING IN 1GR POSITION OF M POSITION [FN4A-EL]

id050301825200

22

No engine braking in 1GR position of M position

DESCRIPTION

•  Engine speed drops to idle but vehicle coasts when the accelerator pedal is released when in M position (1GR) at low vehicle speed.

POSSIBLE CAUSE

1.  Clutch slippage, burnt (low and reverse brake)

•  Line pressure low

•  Shift solenoid C malfunction

•  Shift solenoid D malfunction

•  Shift solenoid E malfunction

•  Control valve body malfunction

•  Body GND malfunction

2.  Signal malfunction

•  APP sensor malfunction

•  Input/turbine speed sensor malfunction

•  ABS wheel-speed sensor malfunction

•  Sensor GND malfunction

3.  M position switch ON not judged by PCM (short, or open circuit, poor operation)

•  M position switch signal malfunction

Note

•  Before following troubleshooting steps, make sure that Automatic Transaxle On-Board Diagnostic and Automatic Transaxle Basic Inspection are conducted. (See ON-BOARD DIAGNOSTIC SYSTEM DTC INSPECTION [PCM (FN4A-EL)].) (See BASIC INSPECTION [FN4A-EL].)

Diagnostic procedure

STEP	INSPECTION		ACTION
1	Do the following symptoms concurrently occur? • Engine flares up or slips during acceleration. • Engine flares up or slips when shifting.	Yes	Go to the symptom troubleshooting “NO.14 ENGINE FLARES UP OR SLIPS WHEN UPSHIFTING OR DOWNSHIFTING” or “NO.15 ENGINE FLARES UP OR SLIPS WHEN ACCELERATING VEHICLE”. (See NO.14 ENGINE FLARES UP OR SLIPS WHEN UPSHIFTING OR DOWNSHIFTING [FN4A-EL].) (See NO.15 ENGINE FLARES UP OR SLIPS WHEN ACCELERATING VEHICLE [FN4A-EL].)
1		No	Repeat the “BASIC INSPECTION” and repair or replace any malfunctioning parts according to the inspection results. (See BASIC INSPECTION [FN4A-EL].)
2	• Verify the test results. ― If normal, return to the diagnostic index to service any additional symptoms. ― If the malfunction remains, inspect the related Service Information and perform repair or diagnosis. • If the vehicle is repaired, troubleshooting is completed. • If the vehicle is not repaired or additional diagnostic information is not available, replace the PCM. (See PCM REMOVAL/INSTALLATION [MZR 1.6].)