Mazda CX 7. Manual — part 251
SYMPTOM TROUBLESHOOTING [AW6A-EL, AW6AX-EL]
05-03–23
05-03
NO.18 EXCESSIVE SHIFT SHOCK IS GIVEN WHEN UPSHIFTING AND DOWNSHIFTING[AW6A-EL, AW6AX-
EL]
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NO.19 EXCESSIVE SHIFT SHOCK ON TORQUE CONVERTER CLUTCH (TCC)[AW6A-EL, AW6AX-EL]
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NO.20 NOISE OCCURS AT IDLE WHEN VEHICLE IS STOPPED IN ALL POSITIONS/RANGES[AW6A-EL,
AW6AX-EL]
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Diagnostic procedure
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18
Excessive shift shock is given when upshifting and downshifting
DESCRIPTION
• Excessive shift shock is felt when depressing the accelerator pedal at upshifting.
• During cruising, excessive shift shock is felt when depressing accelerator pedal at downshifting.
POSSIBLE
CAUSE
• Shift shock may worsen when the fail-safe is operating. The shift shock may worsen if the accelerator
pedal position sensor, APP sensor, input/turbine speed sensor, or VSS signal malfunctions.
— Clutch slippage, burnt (C1 clutch, C2 clutch, C3 clutch, B1 brake)
• Line pressure low, high
• Incorrect accelerator opening signal
• VSS malfunction
• Input/turbine speed sensor malfunction
• TFT sensor malfunction
• Shift solenoid C malfunction
• Shift solenoid D malfunction
• Shift solenoid E malfunction
• Line pressure control solenoid malfunction
• TCC control solenoid malfunction
• Shift solenoid F malfunction
• Body GND and sensor GND malfunction
• Control valve body malfunction
— Poor hydraulic operation (Malfunction in range change)
19
Excessive shift shock on torque converter clutch (TCC)
DESCRIPTION
• Strong shock is felt when the TCC is engaged.
POSSIBLE
CAUSE
• The troubleshooting flow is the same as No.16 “JUDDER UPON TORQUE CONVERTER CLUTCH
(TCC) OPERATION”.
20
Noise occurs at idle when vehicle is stopped in all positions/ranges
DESCRIPTION
• Transaxle is noisy in all positions and ranges when the vehicle is idling.
POSSIBLE
CAUSE
• The malfunction is in the pressure solenoid or oil pump which causes a high-pitched noise to be emitted
from the transaxle at idle.
Note
• If a noise is emitted during shifting only, the malfunction is in the C1 clutch, C2 clutch, C3 clutch
or B1 brake.
• If a noise is emitted during shifting at certain gears only or during deceleration only, it is gear
noise.
• Before following the troubleshooting steps, make sure that the Automatic Transaxle On-Board
Diagnostic and Automatic Transaxle Basic Inspection are conducted. (See 05-03-3 BASIC
INSPECTION[AW6A-EL, AW6AX-EL].)
STEP
INSPECTION
ACTION
1
• Inspect engine condition.
• Is there any engine concern (e.g. Rough
idle)?
Yes
Go to appropriate symptom troubleshooting.
(See 01-03-5 ENGINE SYMPTOM
TROUBLESHOOTING[L3 WITH TC].)
No
Replace basic inspection and repair or replace any
malfunctioning parts according to the inspection result
2
• Verify test results.
— If normal, return to the diagnostic index to service any additional symptoms.
— If 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.
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SYMPTOM TROUBLESHOOTING [AW6A-EL, AW6AX-EL]
05-03–24
NO.21 NOISE OCCURS AT IDLE WHEN VEHICLE IS STOPPED IN D RANGE, OR IN R POSITION[AW6A-EL,
AW6AX-EL]
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NO.22 NO ENGINE BRAKING IN 1GR POSITION OF M RANGE[AW6A-EL, AW6AX-EL]
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Diagnostic procedure
End Of Sie
21
Noise occurs at idle when vehicle is stopped in D range, or in R position
DESCRIPTION
• Transaxle is noisy in driving ranges when vehicle idling.
POSSIBLE
CAUSE
• Although the malfunction is basically the same as No.20 “NOISE OCCURS AT IDLE WHEN VEHICLE
IS STOPPED IN ALL POSITIONS/RANGES”, other causes may include selector lever position disparity
or TR switch position disparity.
22
No engine braking in 1GR position of M range
DESCRIPTION
• Engine speed drops to idle but the vehicle coasts when the accelerator pedal is released during
cruising at medium to high speeds.
• Engine speed drops to idle but the vehicle coasts when accelerator pedal is released when in M range
(1GR) at low vehicle speed.
POSSIBLE
CAUSE
• Clutch slippage, burnt (B2 brake)
— Line pressure low
• VSS malfunction
• Input/turbine speed sensor malfunction
• Shift solenoid A or B malfunction
• Sensor GND malfunction
• 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. (See 05-03-3 BASIC
INSPECTION[AW6A-EL, AW6AX-EL].)
STEP
INSPECTION
ACTION
1
• Do the following symptoms occur
concurrently?
— Engine flares up or slips during
acceleration
— Engine flares up or slips when shifting
Yes
Go to No.14 “ENGINE FLARES UP OR SLIPS WHEN
UPSHIFTING OR DOWNSHIFTING”, or No.15 “ENGINE
FLARES UP OR SLIPS WHEN ACCELERATING
VEHICLE”.
No
Go to the next step.
2
• Stop the engine.
• Inspect following solenoids.
(See 05-17-20 SOLENOID VALVE
INSPECTION[AW6A-EL, AW6AX-EL].)
— Shift solenoid A
— Shift solenoid B
• Are the normal?
Yes
Inspect the ATF condition.
• If a large amount of metal specks are found, replace the
transaxle.
(See 05-17-29 AUTOMATIC TRANSAXLE REMOVAL/
INSTALLATION[AW6A-EL, AW6AX-EL].)
• If a large amount of metal specks are not found, replace
the control valve body.
(See 05-17-38 CONTROL VALVE BODY REMOVAL/
INSTALLATION[AW6A-EL, AW6AX-EL].)
No
Replace the control valve body.
(See 05-17-38 CONTROL VALVE BODY REMOVAL/
INSTALLATION[AW6A-EL, AW6AX-EL].)
3
• Verify test results.
— If normal, return to the diagnostic index to service any additional symptoms.
— If 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.
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SYMPTOM TROUBLESHOOTING [AW6A-EL, AW6AX-EL]
05-03–25
05-03
NO.23 TRANSAXLE OVERHEATS[AW6A-EL, AW6AX-EL]
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Diagnostic procedure
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23
TRANSAXLE OVERHEATS
DESCRIPTION
• Burnt smell emitted from transaxle.
• Smoke emitted from transaxle.
POSSIBLE
CAUSE
• The malfunction is restricted to the hindrance of coolant at the oil cooler. In addition, overheating of the
transaxle may be caused by a malfunction of the TFT sensor.
— Line pressure low
• ATF level low
• Incorrect accelerator opening signal
— Oil cooler malfunction (Foreign material mixed in with ATF)
— TFT sensor malfunction
— Excessive amount of ATF
Note
• Before following the troubleshooting steps, make sure that the Automatic Transaxle On-Board
Diagnostic and Automatic Transaxle Basic Inspection are conducted. (See 05-03-3 BASIC
INSPECTION[AW6A-EL, AW6AX-EL].)
STEP
INSPECTION
ACTION
1
• Is the line pressure normal?
(See 05-17-3 MECHANICAL SYSTEM
TEST[AW6A-EL, AW6AX-EL].)
Yes
Go to the next step.
No
Repair or replace any malfunctioning parts according to the
inspection results.
2
• Is stall speed normal?
(See 05-17-3 MECHANICAL SYSTEM
TEST[AW6A-EL, AW6AX-EL].)
Yes
Go to the next step.
No
Repair or replace any malfunctioning parts according to the
inspection results.
3
• Inspect the TFT sensor and related wiring
harness: vibration, intermittent open/short
circuit
(See 05-17-12 TRANSAXLE FLUID
TEMPERATURE (TFT) SENSOR
INSPECTION[AW6A-EL, AW6AX-EL].)
• Is it normal?
Yes
Go to the next step.
No
Repair or replace part if necessary.
4
• Inspect the line pressure control solenoid.
(See 05-17-20 SOLENOID VALVE
INSPECTION[AW6A-EL, AW6AX-EL].)
• Is it normal?
Yes
Go to the next step.
No
Replace the control valve body.
(See 05-17-38 CONTROL VALVE BODY REMOVAL/
INSTALLATION[AW6A-EL, AW6AX-EL].)
5
• Inspect for bending, damage, corrosion or
kinks of the oil cooler pipes.
• Are oil cooler pipes normal?
Yes
Replace the transaxle.
(See 05-17-29 AUTOMATIC TRANSAXLE REMOVAL/
INSTALLATION[AW6A-EL, AW6AX-EL].)
No
Replace any malfunctioning parts.
6
• Verify test results.
— If normal, return to the diagnostic index to service any additional symptoms.
— If 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.
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SYMPTOM TROUBLESHOOTING [AW6A-EL, AW6AX-EL]
05-03–26
NO.24 ENGINE STALLS WHEN SHIFTED TO D RANGE, OR IN R POSITION[AW6A-EL, AW6AX-EL]
id050310802900
Diagnostic procedure
End Of Sie
NO.25 ENGINE STALLS WHEN DRIVING AT SLOW SPEED OR STOPPING[AW6A-EL, AW6AX-EL]
id050310803000
Diagnostic procedure
End Of Sie
24
Engine stalls when shifted to D range, or in R position
DESCRIPTION
• Engine stalls when shifting from N or P position to D range or R position at idle.
POSSIBLE
CAUSE
• The malfunction is on the engine control side (e.g. electronic controlled throttle system). Otherwise, the
malfunction is in the input/turbine speed sensor (engine sometimes starts) or the TCC circuit (engine
always stalls).
Note
• Before following the troubleshooting steps, make sure that the Automatic Transaxle On-Board
Diagnostic and Automatic Transaxle Basic Inspection are conducted. (See 05-03-3 BASIC
INSPECTION[AW6A-EL, AW6AX-EL].)
STEP
INSPECTION
ACTION
1
• Go to symptom troubleshooting No.5
“ENGINE STALLS-AFTER START/AT IDLE”.
(See 01-03-23 NO.5 ENGINE STALLS-
AFTER START/AT IDLE[L3 WITH TC].)
• Is the engine control system normal?
Yes
Go to the next step.
No
Repair or replace any malfunctioning parts according to the
inspection results.
2
• Remove the torque converter.
(See 05-17-46 TORQUE CONVERTER
REMOVAL/INSTALLATION[AW6A-EL,
AW6AX-EL].)
• Inspect the torque converter.
• Is the torque converter normal?
Yes
Inspect for bending, damage, corrosion or kinks of the oil
cooler pipes.
• If normal, replace the control valve body.
(See 05-17-38 CONTROL VALVE BODY REMOVAL/
INSTALLATION[AW6A-EL, AW6AX-EL].)
• If problem remains, replace the transaxle.
(See 05-17-29 AUTOMATIC TRANSAXLE REMOVAL/
INSTALLATION[AW6A-EL, AW6AX-EL].)
No
Replace the torque converter.
3
• Verify test results.
— If normal, return to the diagnostic index to service any additional symptoms.
— If 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.
25
Engine stalls when driving at slow speeds or stopping
DESCRIPTION
• Engine stalls when the brake pedal is depressed while driving at low speed or stopping.
POSSIBLE
CAUSE
• The malfunction is in the engine control system (e.g. Fuel injection control, electronic controlled throttle
system)
Note
• Before following the troubleshooting steps, make sure that the Automatic Transaxle On-Board
Diagnostic and Automatic Transaxle Basic Inspection are conducted. (See 05-03-3 BASIC
INSPECTION[AW6A-EL, AW6AX-EL].)
STEP
INSPECTION
ACTION
1
• Go to symptom troubleshooting No.10 “LOW
IDLE/STALLS DURING DECELERATION”.
(See 01-03-39 NO.10 LOW IDLE/STALLS
DURING DECELERATION[L3 WITH TC].)
• Is the engine control system normal?
Yes
Go to No.24 “ENGINE STALLS WHEN SHIFTED TO D
RANGE, OR IN R POSITION”.
No
Repair or replace any malfunctioning parts according to the
inspection results.
2
• Verify test results.
— If normal, return to the diagnostic index to service any additional symptoms.
— If 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.
1871-1U-06B(05-03).fm 26 ページ 2006年3月15日 水曜日 午前11時19分
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