Mazda 626 Station Wagon, Workshop Manual

Page: 296 / 577

ON-BOARD DIAGNOSTIC
STEP INSPECTION
ACTION
5 INSPECT LINE PRESSURE
• Start engine.
• Measure line pressure.
Specification
Idle: 334
— 470 kPa {3.4—4.8 kgf/cm2,
49 — 68 psi}
Stall: 1,158— 1,323 kPa {11.8—13.5 kgf/cm2,
168—191 psi}
• Is line pressure within specification?
(See K2-21 MECHANICAL SYSTEM TEST, Line
Pressure Test.)
Yes Go to next step.
No • All ranges: Replace oil pump or control valve body,
then go to Step 9.
(See K2-46 CONTROL VALVE BODY REMOVAL.)
(See K2-46 CONTROL VALVE BODY INSTALLATION.)
(See ATX Workshop Manual FN4A-EL [1623-10-98E].)
• Any ranges: Replace ATX, then go to Step 9.
(See K2-41 AUTOMATIC TRANSAXLE (ATX)
REMOVAL/INSTALLATION.)
6 INSPECT STALL SPEED
• Measure stall speed at D range.
Specification
2,350 — 2,650 rpm
• Is stall speed within specification?
(See K2-21 MECHANICAL SYSTEM TEST, Stall
Test.)
Yes Go to next step.
No Go to Step 8.
7 INSPECT TURBINE SPEED WHEN DRIVING
WITH VEHICLE SPEED 80 KM/H IN D RANGE
• Turn ignition key to OFF.
• Connect NGS tester to DLC.
• Start engine.
• Access VS, D SW, 4GR, TURBINE, THOP
and TURBINE PIDs using NGS tester.
• Drive vehicle while monitoring PIDs.
— VS PID: 80 km/h {49 mph}
— D SW PID: ON
— 4GR PID: ON
— THOP PID: 17%
• Is TURBINE PID okay?
TURBINE PID: Approx. 2,100 rpm
Yes Go to next step.
No Replace control valve body, then go to next step.
(See K2-46 CONTROL VALVE BODY REMOVAL.)
(See K2-46 CONTROL VALVE BODY INSTALLATION.)
8
CHECK OPERATION OF EACH VALVE AND
EACH SPRING
• Turn ignition key to OFF.
• Remove control valve body.
• Disassemble control valve body.
• Is each valve operation okay and is return
spring okay?
(See K2-46 CONTROL VALVE BODY
REMOVAL)
(See K2-46 CONTROL VALVE BODY
INSTALLATION.)
(See ATX Workshop Manual FN4A-EL
[1623-10-98E]-)
Yes Replace ATX, then go to next step
(See ATX Workshop Manual FN4A-EL.)
No
Repair or replace shift valve and return spring, then go to
next step.
(See K2-46 CONTROL VALVE BODY REMOVAL.)
(See K2-46 CONTROL VALVE BODY INSTALLATION.)
(See ATX Workshop Manual FN4A-EL [1623-10-98E].)
9
VERIFY TROUBLESHOOTING OF DTC P0734
COMPLETED
• Make sure to reconnect all disconnected
connectors.
• Clear DTC from memory using NGS tester.
• Start engine.
• Warm up ATX.
• Access ATFT, 4GR, D SW, RPM, TURBINE,
VS, and THOP PIDs using NGS tester.
• Drive vehicle under following condition for 15
seconds or more while monitoring PIDs.
— ATFT PID: 20 * C {68 * F} or above
— 4GR PID: ON
— D SW PID: ON
— RPM PID: 450 rpm or above
—
TURBINE PID: within 225-^1,988 rpm
— VS PID: 50 km/h {31 mph} or above.
— THOP PID: 0% .
• Is same DTC present?
Yes
Replace PCM, then go to next step.
(See Section F1.)
No Go to next step.
K 2-89