Mazda CX-7 2007 Workshop Manual page 996

SYMPTOM TROUBLESHOOTING [AW6A-EL, AW6AX-EL]
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NO.10 FREQUENT SHIFTING[AW6A-EL, AW6AX-EL]
10 Frequent shifting
• Downshifting occurs suddenly even when accelerator pedal is depressed slightly in D range.
DESCRIPTION
• The malfunctioning circuit is basically the same as No.9 "ABNORMAL SHIFTING". However, a
POSSIBLE malfunction of the input signal to the accelerator pedal position sensor, APP sensor, input/turbine speed
CAUSE sensor, VSS (including the sensor GND, sensor wiring harness and connector), or clutch slippage
(clutch stuck, low pressure in line) may also be the cause.
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NO.11 SHIFT POINT IS HIGH OR LOW[AW6A-EL, AW6AX-EL]
11 Shift point is high or low
• Shift point considerably different from automatic shift diagram.
• Shift delays when accelerating.
DESCRIPTION
• Shift occurs quickly when accelerating and engine speed does not increase.
• If the transaxle does not shift abnormally, there is a malfunction of the input signal to the APP sensor,
POSSIBLE input/turbine speed sensor, or VSS.
• If the engine speed is high or low, regardless of normal shifting, inspect the tachometer.
CAUSE
• Verify that the output signals of the accelerator pedal position sensor and APP sensor change linearly.
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NO.12 TORQUE CONVERTER CLUTCH (TCC) NON-OPERATION[AW6A-EL, AW6AX-EL]
12 Torque converter clutch (TCC) non-operation
• TCC does not operate when vehicle reaches TCC operation range.
DESCRIPTION
• Basically, TCC does not operate when the fail-safe is operating. Verify the DTC at first. If the TCC
operates when driving at high speeds only, the malfunction (improper adjustment) is in the M range
switch circuit or TR switch circuit.
Caution
• If the TCC is stuck, inspect it. In addition, inspect the oil cooler for foreign particles which
• TCC slippage, burnt
— Line pressure low
• Incorrect accelerator opening signal
• Input/turbine speed sensor malfunction
• VSS malfunction
POSSIBLE
• Output solenoid valve system malfunction (Sticking)
CAUSE
• TCC control solenoid malfunction
• Control valve body system malfunction (Poor operation, sticking)
• TCC hydraulic pressure system malfunction
• Accelerator pedal position sensor malfunction (Not operating linearly)
• Input/turbine speed sensor or VSS malfunction
• Operation of fail-safe function.
— Short to power or GND at TCC control solenoid related circuit.
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].)
Diagnostic procedure
STEP
• With the ignition switch at the ON position.
1
• Does the gear position indicator light
indication correspond to the selector lever
position?
• Disconnect the TCM.
2
• Is the resistance between the TCM ground
terminal A9 and the body GND less than 5.0
ohms?
05-03–18
may have mixed in with the ATF.
INSPECTION
Yes Go to the next step.
No Go to No.27 "GEAR POSITION INDICATOR LIGHT DOES
NOT ILLUMINATE IN M RANGE", or No.28 "GEAR
POSITION INDICATOR LIGHT ILLUMINATES IN D RANGE
OR P, N, R POSITIONS".
Yes Go to the next step.
No Repair open ground circuit.
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