Mazda 6. Manual — part 220

TROUBLESHOOTING

K–121

K

Diagnostic procedure

End Of Sie

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.

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

F–45 PCM

INSPECTION

.)

• TFT

• TFTV

Is PID value okay?

Yes

Go to next step.

No

Repair or replace any defective parts.

3

Check the value at the following PIDs using the
NGS tester. (See

F–45 PCM INSPECTION

.)

• SSA/SS1

• SSB/SS2

• SSC/SS3

Are PID values okay?

Yes

Overhaul control valve body and repair or replace any
defective parts. If problem remains, overhaul transaxle and
repair or replace any defective parts. (See ATX workshop
manual (FN4A-EL) [1623-10-98E].) (See ATX workshop
manual supplement (FN4A-EL) [1746-1*-02C].)

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

F–45 PCM INSPECTION

.)

• TR

• TSS

• VSS

Repair or replace any defective parts.

No

Repair open ground circuit. Reconnect PCM.

K–122

TROUBLESHOOTING

NO.9 ABNORMAL SHIFTING

A6E568001030W13

Diagnostic procedure

End Of Sie

NO.10 FREQUENT SHIFTING

A6E568001030W14

End Of Sie

NO.11 SHIFT POINT IS HIGH OR LOW

A6E568001030W15

End Of Sie

9

Abnormal shifting

DESCRIPTION

• Shift incorrectly (incorrect shift pattern).

POSSIBLE

CAUSE

• There is a malfunction in the signal circuit which controls shifting (TP sensor, input/turbine speed

sensor, vehicle speed sensor), the control valve is stuck, the accumulator (forward or servo apply) is
stuck, or the clutch circuit is stuck.
1. Clutch slipped, burned

• Line pressure low

• Control valve body malfunction

• Shift solenoid D malfunction

• Shift solenoid E malfunction

• Shift solenoid A malfunction

• Shift solenoid B malfunction

• Shift solenoid C malfunction

• Body GND malfunction

• Accelerator cable misadjustment

2. Signal malfunction

• Vehicle speed sensor malfunction

• Sensor GND malfunction

• TP sensor malfunction or mis-adjustment

• Input/turbine speed sensor malfunction

3. TR switch malfunction

• Selector lever adjustment incorrect

• TR sensor adjustment incorrect

Note

• Before following troubleshooting steps, make sure that Automatic Transaxle On-Board Diagnostic

and Automatic Transaxle Basic Inspection are conducted.

STEP

INSPECTION

ACTION

1

Disconnect PCM Is resistance between ground
terminal at PCM connector and body ground
less than 5.0 ohms?

Yes

Go to next step.

No

Repair open ground circuit. Reconnect PCM.

2

Check the value at the following PIDs using the
WDS or equivalent. (See 3940 PCM
INSPECTION.)

• TP

• TSS

• VSS

Is PID value okay?

Yes

Overhaul control valve body and repair or replace any
defective parts. If problem remains, overhaul transaxle and
repair or replace any defective parts. (See ATX workshop
manual (FN4A-EL) [1623-10-98E].) (See ATX workshop
manual supplement (FN4A-EL) [1746-1*-02C].)

No

Repair or replace any defective parts.

10

Frequent shifting

DESCRIPTION

• Downshifting occurs immediately even when accelerator pedal is depressed slightly in D, S, L ranges

except HOLD mode.

POSSIBLE

CAUSE

• The circuit which is the cause is basically the same as No.9 “Abnormal shifting”. However, a malfunction

of the input signal to the TP sensor, input/turbine speed sensor, vehicle speed sensor (including the
sensor GND, sensor harness and connector), or clutch slippage (clutch stuck, low pressure in line) may
also be the cause.

11

Shift point is high or low

DESCRIPTION

• Shift point considerably different from automatic shift diagram.

• Shift delays when accelerating.

• Shift occurs quickly when accelerating and engine speed does not increase.

POSSIBLE

CAUSE

• If the transaxle does not shift abnormally, there is a malfunction of the input signal to the TP sensor,

input/turbine speed sensor, or vehicle speed sensor (including sensor GND).

• If the engine speed is high or low, regardless normal shifting, inspect the tachometer.

• Verify that the output signal of the TP sensor changes linearly.

TROUBLESHOOTING

K–123

K

NO.12 TORQUE CONVERTER CLUTCH (TCC) NON-OPERATION

A6E568001030W16

Diagnostic procedure

End Of Sie

NO.13 NO KICKDOWN

A6E568001030W17

12

Torque converter clutch (TCC) non-operation

DESCRIPTION

• TCC does not operate when vehicle reaches TCC operation range.

POSSIBLE

CAUSE

• Basically, the TCC does not operate when the fail-safe is operating. Verify the DTC first.

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 burned

(1) Input sensor system malfunction

• Transaxle fluid temperature sensor

• Vehicle speed sensor

• Input/turbine speed sensor

• Sensor GND

(2) Output solenoid valve system malfunction (Sticking)

• Shift solenoid E malfunction

• Shift solenoid A malfunction

(3) Control valve body malfunction system (Poor operation, stuck)

• TCC hydraulic pressure system

2. TP sensor malfunction (Not operating linear)
3. Input/turbine speed sensor or vehicle speed sensor malfunction
4. Brake switch malfunction (Always ON)
5. ECT sensor malfunction

Note

• Before following troubleshooting steps, make sure that Automatic Transaxle On-Board Diagnostic

and Automatic Transaxle Basic Inspection are conducted.

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 PIDs using the
WDS or equivalent. (See

F–45 PCM

INSPECTION

.)

• TP

• VSS

• TSS

Are PID values okay?

Yes

Go to next step.

No

Repair or replace any defective parts.

3

Disconnect PCM.
Is resistance between ground terminal at PCM
connector and body ground less than 5.0
ohms?

Yes

Go to next step.

No

Repair open ground circuit.

4

Check resistance between shift solenoid A and
E control circuit at PCM connector and control
valve body connector. Check resistance
between shift solenoid A and E circuit at PCM
connector and control valve body connector. Are
the resistances less than 5.0 ohms?

Yes

Go to next step.

No

Repair shift solenoid A or E control. Reconnect PCM.

5

Inspect shift solenoid A and E. (See

K–26

SOLENOID VALVE INSPECTION

.) Are the shift

solenoids operating properly?

Yes

Replace PCM.

No

Overhaul control valve body and repair or replace any
defective parts. If problem remains, overhaul transaxle and
repair or replace any defective parts.(See ATX workshop
manual (FN4A-EL) [1623-10-98E].) (See ATX workshop
manual supplement (FN4A-EL) [1746-1*-02C].)

13

No kickdown

DESCRIPTION

• Does not downshift when accelerator pedal is fully depressed within kickdown range.

POSSIBLE

CAUSE

• If transaxle does not downshift though shifting is normal, malfunction is in TP sensor circuit (including

sensor GND, sensor harness and connector).

K–124

TROUBLESHOOTING

End Of Sie

NO.14 ENGINE FLARES UP OR SLIPS WHEN UPSHIFTING OR DOWNSHIFTING

A6E568001030W18

Diagnostic procedure

End Of Sie

NO.15 ENGINE FLARES UP OR SLIPS WHEN ACCELERATING VEHICLE

A6E568001030W19

End Of Sie

14

Engine flares up or slips when upshifting or downshifting

DESCRIPTION

• When accelerator pedal is depressed for driveway, engine speed increases but vehicle speed increases

slowly.

• When accelerator pedal is depressed while driving, engine speed increases but vehicle does not.

POSSIBLE

CAUSE

• There is clutch slip because clutch is stuck or line pressure is low.

1. Clutch stuck, slippage (forward clutch, 3–4 clutch, 2–4 brake band, one-way clutch)

• Line pressure low

• Shift solenoid D malfunction

• Shift solenoid E malfunction

• Shift solenoid A malfunction

• Shift solenoid B malfunction

• Shift solenoid C malfunction

• Pressure control solenoid malfunction

• Body GND malfunction

• Accelerator cable misadjustment

• Control valve body malfunction

2. Signal malfunction

• Vehicle speed sensor malfunction

• Sensor GND malfunction

• TP sensor malfunction or mis-adjustment

• Input/turbine speed sensor malfunction

3. Poor operation of mechanical pressure

• Selector lever position disparity

• TR switch position disparity

Note

• Before following troubleshooting steps, make sure that Automatic Transaxle On-Board Diagnostic

and Automatic Transaxle Basic Inspection are conducted.

STEP

INSPECTION

ACTION

1

Is shift point okay?

Yes

Go to next step.

No

Go to No.9 "ABNORMAL SHIFTING"

2

Check the value at the following PID using the
WDS or equivalent. (See

F–45 PCM

INSPECTION

.)

• TP

Is PID value okay?

Yes

Go to next step.

No

Repair or replace any defective parts.

3

Disconnect PCM. Is resistance between ground
terminal at PCM connector and body ground
less than 5.0 ohms?

Yes

Go to next step.

No

Repair open ground circuit. Reconnect PCM.

4

Check LPS PID value.
Is LPS PID value okay?
(See

F–45 PCM INSPECTION

.)

Yes

Overhaul control valve body and repair or replace any
defective parts. If problem remains, overhaul transaxle and
repair or replace any defective parts. (See ATX workshop
manual (FN4A-EL) [1623-10-98E].) (See ATX workshop
manual supplement (FN4A-EL) [1746-1*-02C].)

No

Repair or replace any defective parts.

15

Engine flares up or slips when accelerating vehicle

DESCRIPTION

• Engine flares up when accelerator pedal is depressed for upshifting.

• Engine flares up suddenly when accelerator pedal is depressed for downshifting.

POSSIBLE

CAUSE

• The malfunction is basically the same as for No.14 "Engine flares up or slips when upshifting or

downshifting". If conditions for No.14 worsen, the malfunction will develop to No.15.