Surges While Cruising; Lack Of Power; Poor Fuel Economy (Symptom) - Mazda B-Series 1997 Workshop Manual

SYMPTOM TROUBLESHOOTING
K
1
7 SURGES WHILE CRUISING
1
Momentary minor irregularity in engine output at steady vehicle speed
I
DESCRIP-
1
[TROUBLESHOOTING HINTS]
O Vehicle speed sensor malfunction
O Control valve bodv malfunction
STEP
-
- -
1
!
INSPECTION
Is resistance of vehicle speed sensor at
powertrain control moclule (PCM) OK?
r e r m .
1
Spec.
1
Condition]
33-58 190-250 Constant
(Ign: OFF)
Note:
58 terminal: Vehicle speed sensor
33 terminal: Ground
Yes
No
ACTION
Go to next step
Check vehicle speed sensor and wiring
page K-68
Is control pressure OK?
page K-91
Repair or replace parts as necessary
(Refer to Control Pressure Test Diagnostic Charts on
page K-92.)
6BUOKX-272
Yes
LACK OF POWER
- - -
Performance poor under load (i.e., power down when climbing hills)
Replace PCM
page K-89
[TROUBLESHOOTING HINTS]
Inspect parts; repair, adjust, or replace malfunctioning parts as necessary
O Torque converter worn
O Powertrain burnt (forward clutch)
G Y
page K-121
ET
page K-135
POOR FUEL ECONOMY
- - - -
a
Fuel economy unsat~sfactory
DESCRIP-
TION
[TROUBLESHOOTING HINTS]
lnspect parts and wiring; repair, or replace malfunctioning parts as necessary
O Torque converter clutch solenoid worn
MKl161-D 6BUOKX-438