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NO.19 EXCESSIVE SHIFT SHOCK FROM N TO D OR N TO R POSITION/RANGE

BHE050301026W24

19 | Excessive shift shock from N to D or N to R position/range
DESCRIPTION | • Strong shock felt when shifting from N to D or N to R position/range.
POSSIBLE CAUSE | • Idle speed high. • Poor hydraulic operation (range change malfunction) – Improper adjustment of TR switch • Poor tightening torque of engine mount, exhaust mount, PPF, and/or differential mount • Suspension looseness • Clutch burned • Line pressure low/high • Input/output signal malfunction (VSS, turbine sensor, TR switch, CAN communication signals (engine speed, throttle opening angle, engine torque), TFT sensor, pressure control solenoid, shift solenoids A and F) • Control valve body malfunction (improper operation of accumulator, stuck accumulator) – Hydraulic circuit clogging (Pressure control solenoid, shift solenoids A and F) – Control valve spool malfunction – Improper operation of accumulators (Low clutch solenoid, low and reverse clutch solenoid) • Improper TCM ground • Improper ground of GND return line at AT – If there is improper ground of GND return line, clutch pressure may decrease, causing clutch slippage. 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 | Perform the idle speed inspection. (See ENGINE TUNE-UP.) Is the idle speed normal? | Yes | Go to the next step.
No | Perform the engine symptom troubleshooting No.9 "FAST IDLE/RUNS ON". (See NO.9 FAST IDLE/RUNS ON.)
2 | Inspect the following installation conditions (poor tightening torque, looseness): • Engine mount • Transmission mount • PPF • Differential mount • Exhaust mount • Suspension Are they normal? | Yes | Go to the next step.
No | Retighten and install any malfunctioning parts correctly.
3 | Disconnect the TCM connector. Is the resistance between ground terminal 2M or 2Q at the TCM connector and body ground 5.0 ohms or less? | Yes | Go to the next step.
No | Repair open ground circuit.
4 | Is the resistance between terminal 2U at the TCM connector and terminal J at the solenoid valve wiring harness-side connector 5.0 ohms or less? | Yes | Go to the next step.
No | Repair open circuit.
5 | Inspect the following values: (See PCM INSPECTION.) (See TCM INSPECTION.) PCM PIDs (using WDS or equivalent): • APP1 • APP2 • TP_REL • VSS • RPM • ECT TCM terminal voltage: • 2G (turbine sensor) • 2K (VSS) • 1D (TR switch, P position) • 2B (TR switch, N position) • 2C (TR switch, R position) • 2E (TR switch, D position) Are the values normal? | Yes | Go to the next step.
No | Repair or replace any malfunctioning parts.
6 | Disconnect the solenoid valve connector. Measure the resistance between the following solenoid valve connector terminals. (See SOLENOID VALVE INSPECTION.) • Terminals E-J (shift solenoid A) • Terminals F-J (shift solenoid B) • Terminals H-J (shift solenoid C) • Terminals I-J (shift solenoid F) • Terminals G-J (TCC solenoid) Are the resistances normal? | Yes | Overhaul the control valve body and repair or replace any malfunctioning parts. (See AT Workshop Manual.) If the problem remains, overhaul the transmission and repair or replace any malfunctioning parts. (See AT Workshop Manual.)
No | Repair or replace malfunctioning parts.
7 | 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.)