Mazda Mazda6 - No.21 Noise Occurs at Idle When Vehicle Is Stopped in D Range, or in R Position; No.22 no Engine Braking in 1 Gr Position of M Range

K2–198
TROUBLESHOOTING
NO.20 NOISE OCCURS AT IDLE WHEN VEHICLE IS STOPPED IN ALL POSITIONS/RANGES
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Diagnostic procedure
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NO.21 NOISE OCCURS AT IDLE WHEN VEHICLE IS STOPPED IN D RANGE, OR IN R POSITION
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NO.22 NO ENGINE BRAKING IN 1GR POSITION OF M RANGE
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Diagnostic procedure
20 Noise occurs at idle when vehicle is stopped in all positions/ranges
DESCRIPTION • Transaxle noisy in all positions and ranges when vehicle idling.
POSSIBLE
CAUSE
• Malfunction is in pressure solenoid or oil pump which causes a high-pitched noise to be emitted from
transaxle at idle.
Note
• If a noise is emitted during shifting only, malfunction is in shift solenoid A, B, or C.
• If a noise is emitted during shifting at certain gears only or during deceleration only, it is gear noise.
• Before following troubleshooting steps, make sure that Automatic Transaxle On-Board Diagnostic
and Automatic Transaxle Basic Inspection are conducted.
STEP INSPECTION ACTION
1 • Inspect engine condition.
• Is any engine concern (e.g. Rough idle)?
Yes Go to appropriate symptom troubleshooting.
(See F1–57 ENGINE SYMPTOM TROUBLESHOOTING.)
No Replace basic inspection and repair or replace any
defective parts according to inspection result.
2 • Verify test results.
— If okay, return to diagnostic index to service any additional symptoms.
— If malfunction remains, inspect related Service Informations and perform repair or diagnosis.
— If vehicle repaired, troubleshooting completed.
— If vehicle not repaired or additional diagnostic information not available, replace TCM.
21 Noise occurs at idle when vehicle is stopped in D range, or in R position
DESCRIPTION • Transaxle 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 be selector lever position disparity or TR switch position
disparity.
Note
• Before following troubleshooting steps, make sure that Automatic Transaxle On-Board Diagnostic
and Automatic Transaxle Basic Inspection are conducted.
22 No engine braking in 1GR position of M range
DESCRIPTION
• Engine speed drops to idle but vehicle coasts when accelerator pedal released during cruising at
medium to high speeds.
• Engine speed drops to idle but vehicle coasts when accelerator pedal released when in M range (1GR)
at low vehicle speed.
POSSIBLE
CAUSE
• Clutch slipped, burned (Reduction brake)
— Line pressure low
• Malfunction of VSS
• Malfunction of input/turbine speed sensor
• Malfunction of sensor ground
• Malfunction of control valve body
— M range switch on not judged by TCM (short, or open circuit, poor operation)
• Malfunction of M range switch signal
Note
• Before following troubleshooting steps, make sure that Automatic Transaxle On-Board Diagnostic
and Automatic Transaxle Basic Inspection are conducted.
STEP INSPECTION ACTION
1 • Inspect TR switch adjustment.
• Does TR switch adjusted properly?
• Select PNP PID.
• Is PNP PID reading okay when selecting
range?
Yes Go to next step.
No Adjust TR switch as necessary.
(See K2–83 TRANSAXLE RANGE (TR) SWITCH
ADJUSTMENT.)
Inspect TR switch.
Repair or replace any defective parts.