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

BME050301030212

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 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, the 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 slippage, burnt

  • 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 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 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 harness
  • Poor connection of connector
  • Solenoid valve stuck

5. HOLD switch malfunction
6. Control valve body malfunction

  Note

  • Before following the troubleshooting steps, make sure that the Automatic Transaxle On-Board Diagnostic and Automatic Transaxle Basic Inspection are conducted.

Diagnostic procedure

STEP | INSPECTION | ACTION
--- | --- | ---
1 | With the ignition switch at the ON position, does the HOLD indicator light indication correspond to the HOLD switch operation? | Yes | Go to the next step.
No | Go to No.26 "HOLD INDICATOR LIGHT DOES NOT ILLUMINATE WHEN HOLD SWITCH IS TURNED TO ON.", No.27 "HOLD INDICATOR LIGHT ILLUMINATE WHEN HOLD SWITCH IS NOT TURNED TO ON."
2 | Inspect the value at the following PCM PIDs using the WDS or equivalent. (See PCM INSPECTION [L3].) • TFT • TFTV Are the PID values normal? | Yes | Go to the next step.
No | Repair or replace any malfunctioning parts.
3 | Inspect the value at the following PCM PIDs using the WDS or equivalent. (See PCM INSPECTION [L3].) • SSA/SS1 • SSB/SS2 • SSC/SS3 Are the PID values normal? | Yes | Overhaul the control valve body and repair or replace any malfunctioning parts. (See ATX workshop manual (FN4A-EL).) If any problem remains, overhaul the transaxle and repair or replace any malfunctioning parts. (See ATX workshop manual (FN4A-EL).)
No | Go to the next step.
4 | Disconnect the PCM connector. Is the resistance between the ground terminal at the PCM connector and the body ground less than 5.0 ohms? | Yes | Inspect the value at the following PCM PIDs using the WDS or equivalent. (See PCM INSPECTION [L3].) • TR • TSS • VSS Repair or replace any malfunctioning parts.
No | Repair open ground circuit. Reconnect the PCM.