Mazda MX-6 1998, Workshop Manual

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TROUBLESHOOTING [GF4A-EL]
STEP INSPECTION ACTION
5 Check the voltage at the following terminals of
powertrain control module
c r 0 1 -40B POWERTRAIN CONTROL
MODULE (PCM) INSPECTION [KL]
• Throttle position sensor signal
• Transaxle fluid temperature sensor signal
• Vehicle speedometer sensor signal
• Transaxle range switch signal (D, 2,1
ranges and R position)
Is terminal voltage okay?
Yes Perform symptom troubleshooting
No Repair or replace any defective parts
AUTOMATIC TRANSAXLE SYMPTOM TROUBLESHOOTING [GF4A-EL]
W6U501W09
Diagnosis Index
• U se th e c h a rt b e lo w to v e rify th e s y m p to m s of th e tro u b le in o rd e r to d ia g n o s e th e a p p ro p ria te area.
No. TROUBLESHOOTING ITEM DESCRIPTION
1 Vehicle does not move in D, 2 ,1 ranges, or in R
position Vehicle does not move when accelerator pedal depressed.
2 Vehicle moves in N position
Vehicle creeps in N position.
Vehicle creeps if brake pedal is not depressed in N position.
3 Vehicle moves in P position, or parking gear does
not disengage when P disengaged Vehicle rolls when on a downward slope and tires do not
lock in P position.
Tires are locked when P disengaged, vehicle does not move
in D, 2, 1 ranges, and R position when accelerator pedal is
depressed, and engine remains in stall condition.
4 Excessive creep
Vehicle accelerates in D, 2, 1 ranges, and R position without
depressing accelerator pedal not depressed.
5 No creep at all
Vehicle does not move in D, 2, 1 ranges, or R position when
idling on a flat paved road.
6
Low maximum speed and poor acceleration Vehicle acceleration is poor at start.
Delayed acceleration when accelerator is depressed while
driving.
7 No shift
Single shift range only.
Sometimes shifts correctly.
8
Does not shift to fourth gear
Vehicle does not upshift from 3GR to 4GR even though
vehicle speed increased.
Vehicle does not shift to 4GR even though accelerator pedal
released D range at 60 km/h {37 mph}.
9
Abnormal
shift
Shifts incorrectly (incorrect shift pattern).
10
Frequent shifting
Downshifting occurs immediately even when accelerator
pedal is depressed slightly in D, 2, 1 ranges (O/D OFF
switch OFF).
11
Shift point high or low
Shift point considerably different from automatic shift
diagram.
Shifts delayed when accelerating.
Shifts occur quickly when accelerating and engine speed
does not increase.
12
Torque converter clutch (TCC) non-operation
TCC
does not operate when vehicle reaches
TCC
operation
range.
13 No kickdown Does not downshift when accelerator pedal is fully
depressed when within kickdown range.
14
Engine flares up or slips when upshifting or
downshifting
When accelerator pedal is depressed for driveaway, engine
speed increases but vehicle speed increases slowly.
When accelerator depressed while driving, engine speed
increases but vehicle does not.
15
Engine flares up or slips when accelerating vehicle
Engine flares up when accelerator pedal is depressed for
upshifting.
Engine flares up suddenly when accelerator pedal is
depressed for downshifting.
0 5 -0 1 B-21