Mazda 626 - Noise Occurs at Idle When Vehicle Is Stopped in D, S, L Ranges or in R Position; No Engine Braking in Hold Mode; Transaxle Overheats

TROUBLESHOOTING
NO.21 NOISE OCCURS AT IDLE WHEN VEHICLE IS STOPPED IN D, S, L RANGES, OR IN R POSITION
21 Noise occurs at idle when vehicle is stopped in D, S, L ranges, or in R position
DESCRIPTION
• Transaxle is noisy in driving ranges when vehicle is 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.
N0.22 NO ENGINE BRAKING IN HOLD MODE
22 No engine braking in hold mode
DESCRIPTION
• Engine speed drops to idle but vehicle coasts when accelerator pedal is released during cruising at
medium to high speeds.
• Engine speed drops to idle but vehicle coasts when accelerator pedal is released when in L range at low
vehicle speed.
POSSIBLE
CAUSE
1 .Clutch slippage, burned (low and reverse brake)
• Line pressure low • TP sensor malfunction
• Vehicle speed sensor malfunction • Control valve body malfunction
• Input/turbine speed sensor malfunction
2. HOLD switch ON not judged by PCM (short, or open circuit, poor operation)
• HOLD switch signal malfunction
Diagnostic procedure
STEP
INSPECTION
ACTION
1 Do following symptoms concurrently occur?
Engine flares up or slips during acceleration.
Engine flares up or slips when shifting.
Yes Go to symptom troubleshooting NO. 14 “Engine flares up
or slips when upshifting or downshifting” or No.15 “Engine
flares up or slips when accelerating vehicle”.
No Repeat basic inspection and repair or replace any
defective parts according to inspection result.
(See K2-136 BASIC INSPECTION)
N0.23 TRANSAXLE OVERHEATS
23 Transaxle overheats
DESCRIPTION
• Burnt smell is emitted from transaxle.
• Smoke is emitted from transaxle.
POSSIBLE
CAUSE
• The malfunction is restricted to hindrance of coolant at the oil cooler. In addition, overheating of the
transaxle may be caused by a malfunction of the transaxle fluid temperature sensor.
1. Burned (TCC)
• Control valve body malfunction • Accelerator cable misadjustment
2. Oil cooler malfunction (Foreign material mixed with ATF)
3.Transaxle fluid temperature sensor malfunction
4. Excessive amount of ATF
5.Torque converter malfunction
Diagnostic procedure
STEP INSPECTION
ACTION
1
Inspect for bent, damage, corrosion or kinks of oil
cooler pipes.
Are oil cooler pipes okay?
Yes Go to next step.
No Replace any defective parts.
2
Perform the stall test.
(See K2-22 MECHANICAL SYSTEM TEST, Stall
Test.)
Is stall speed okay?
Yes Go to next step.
No Repair or replace any defective parts.
3 Check the value at the following PID using the
NGS tester.
(See F1-25 PCM INSPECTION.)
• TPV
Is PID value okay?
Yes Go to next step.
No
Repair or replace any defective parts.
K2-152