NO.8 DOES NOT SHIFT TO 4GR [FN4A-EL]

id050301808200

8

Does not shift to 4GR

DESCRIPTION

•  Vehicle does not upshift from 3GR to 4GR even though vehicle speed is increased.

•  Vehicle does not shift to 4GR even though the accelerator pedal is released in D position at 60 km/h {37 mph}.

POSSIBLE CAUSE

•  Basically, TCC does not operate when the fail-safe is operating. Verify the DTCs first. If the TCC operates when driving at high speeds only, malfunction (improper adjustment) is in the TR switch circuit.

Caution

•  If the TCC is stuck, inspect it. In addition, inspect the oil cooler for foreign particles which may have mixed in with the ATF.

1.  TCC piston slipped, burnt

•  Line pressure low

•  APP sensor malfunction

•  Input/turbine speed sensor malfunction

•  ABS wheel-speed sensor malfunction

•  ECT sensor malfunction

•  Sensor GND malfunction

2.  TFT sensor malfunction

•  Short or open circuit in wiring harness

•  Poor connection of connector

•  Sensor malfunction

3.  TR switch malfunction

•  Short or open circuit in wiring harness

•  Poor connection of connector

•  Sensor malfunction

•  Selector cable adjustment incorrect

•  TR switch adjustment incorrect

4.  Shift solenoid A, shift solenoid B, shift solenoid D valve malfunction

•  Short or open circuit in wiring harness

•  Poor connection of connector

•  Solenoid valve stuck

5.  M position switch (built-in selector lever component) malfunction

6.  Control valve body 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	Does the gear position indicator light indication correspond to the selector lever position with the ignition at the ON?	Yes	Go to the next step.
1		No	Perform the symptom troubleshooting “NO.27 GEAR POSITION INDICATOR LIGHT DOES NOT ILLUMINATE IN M POSITION” or “NO.28 GEAR POSITION INDICATOR LIGHT ILLUMINATES IN P, R, N AND D POSITION”. (See NO.27 GEAR POSITION INDICATOR LIGHT DOES NOT ILLUMINATE IN M POSITION [FN4A-EL].) (See NO.28 GEAR POSITION INDICATOR LIGHT ILLUMINATES IN P, R, N AND D POSITION [FN4A-EL].)
2	Inspect the following PID values using the M-MDS: (See ON-BOARD DIAGNOSTIC SYSTEM PID/DATA MONITOR INSPECTION [PCM (FN4A-EL)].) • TFT • TFTV Are the PID values normal?	Yes	Go to the next step.
2		No	Repair or replace any malfunctioning parts.
3	Inspect the following PID values using the M-MDS: (See ON-BOARD DIAGNOSTIC SYSTEM PID/DATA MONITOR INSPECTION [PCM (FN4A-EL)].) • SSA/SS1 • SSB/SS2 • SSD/SS4 Are the PID values normal?	Yes	Overhaul the control valve body and repair or replace any malfunctioning parts. If any problem remains: • Overhaul the transaxle and repair or replace any malfunctioning parts.
3		No	Go to the next step.
4	Disconnect the PCM connector. Measure the resistance between ground terminal at the PCM connector and body ground. Is the resistance less than 5.0 ohms?	Yes	Inspect the following PID values using the M-MDS: (See ON-BOARD DIAGNOSTIC SYSTEM PID/DATA MONITOR INSPECTION [PCM (FN4A-EL)].) • TR • TSS • VSS Repair or replace any malfunctioning parts.
4		No	Repair or replace the wiring harness for a possible open circuit.
5	• 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].)