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NO.8 DOES NOT SHIFT TO FOURTH GEAR (4GR) [FN4A-EL]

id0503a1808200

8 | Does not shift to fourth gear (4GR)
DESCRIPTION | • Vehicle does not upshift from 3GR to 4GR even though vehicle speed increased. • Vehicle does not shift to 4GR even though accelerator pedal is released in D range at 60 km/h {37 mph}.
POSSIBLE CAUSE | • Basically, TCC does not operate when fail-safe is operating. Verify the DTCs first. If the TCC operates when driving at high speeds only, malfunction (improper adjustment) is in the HOLD switch circuit or 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, burned • Line pressure low • TP sensor malfunction • Engine coolant temperature sensor malfunction • Vehicle speed sensor malfunction • Input/turbine speed sensor malfunction • Sensor GND malfunction 2. Transaxle fluid temperature sensor malfunction • Short or open circuit in wiring • Poor connection of connector • Sensor malfunction 3. TR switch malfunction • Short or open circuit in wiring • Poor connection of connector • Sensor malfunction • Selector lever adjustment incorrect • TR switch adjustment incorrect 4. Shift solenoid A, shift solenoid B, shift solenoid D valve malfunction • Short or open circuit in wiring • Poor connection of connector • Solenoid valve stuck 5. HOLD switch 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.

Diagnostic procedure

STEP | INSPECTION | ACTION
--- | --- | ---
1 | • With indicator switch at ON, does HOLD indicator light indication correspond to HOLD switch operation? | Yes | Go to next step.
No | Go to No.26 "HOLD INDICATOR LIGHT DOES NOT ILLUMINATE WHEN HOLD SWITCH IS TURNED ON", No.27 "HOLD INDICATOR LIGHT ILLUMINATES WHEN HOLD SWITCH IS NOT TURNED ON."
2 | • Check the value at the following PID using the WDS or equivalent. (See PCM INSPECTION [WITHOUT WU-TWC].) (See PCM INSPECTION [WITH WU-TWC].) - TFT - TFTV • Is PID value normal? | Yes | Go to next step.
No | Repair or replace any defective parts.
3 | • Check the value at the following PIDs using the WDS or equivalent. (See PCM INSPECTION [WITHOUT WU-TWC].) (See PCM INSPECTION [WITH WU-TWC].) - SSA/SS1 - SSB/SS2 • Are PID values normal? | Yes | Overhaul control valve body and repair or replace any defective parts. (See ATX workshop manual (FN4A-EL) [1623-10-98E].) If problem remains, overhaul transaxle and repair or replace any defective parts. (See ATX workshop manual (FN4A-EL) [1623-10-98E].)
No | Go to next step.
4 | • Disconnect PCM. • Is resistance between ground terminal at PCM connector and body ground less than 5.0 ohms? | Yes | Check the value at the following PIDs using the WDS or equivalent. (See PCM INSPECTION [WITHOUT WU-TWC].) (See PCM INSPECTION [WITH WU-TWC].) • TR • TSS • VSS Repair or replace any defective parts.
No | Repair open ground circuit. Reconnect PCM.
5 | • Verify test results. - If normal, return to diagnostic index to service any additional symptoms. - If malfunction remains, inspect related Service Information and perform repair or diagnosis. • If vehicle repaired, troubleshooting completed. • If vehicle not repaired or additional diagnostic information not available, replace PCM.