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NO.24 NO ENGINE BRAKING IN 1GR POSITION OF M RANGE

BHE050301026W29

24 | No engine braking in 1GR position of M range
DESCRIPTION | • Engine speed drops to idle but vehicle coasts when accelerator pedal is released when in 1GR of M range at low vehicle speed.
POSSIBLE CAUSE | • Clutch slippage (low and reverse brake) – In the event of clutch slippage, a DTC (incorrect gear ratio) is output. • Input/output signal malfunction – M range switch (short or open circuit, poor connection) – Shift solenoid F • Control valve body malfunction (improper operation, stuck) – Hydraulic circuit clogging (Shift solenoid F) Note • Before following the troubleshooting steps, make sure that the Automatic Transmission On-Board Diagnostic and Automatic Transmission Basic Inspection are conducted. (See BASIC INSPECTION.)

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 symptom troubleshooting NO.16 "ENGINE FLARES UP OR SLIPS WHEN UPSHIFTING OR DOWNSHIFTING" or No.17 "ENGINE FLARES UP OR SLIPS WHEN ACCELERATING VEHICLE".
No | Repeat the basic inspection and repair or replace any malfunctioning parts according to the inspection result. (See BASIC INSPECTION.)
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 Bulletins and/or On-line Repair Information and perform repair or diagnosis. – If the vehicle is repaired, troubleshooting completed. – If the vehicle is not repaired or additional diagnostic information is not available, replace the TCM. (See TCM REMOVAL/INSTALLATION.)