Mazda 626 Station Wagon, Workshop Manual

Page: 171 / 577

TROUBLESHOOTING
— IAC valve air passage
— Open or short circuit between IAC
valve connector terminals and PCM
connector terminals 83 and 20 (for
GF4A-EL models)/54 (except for
GF4A-EL models)
3. Warm up the engine to normal operating
temperature and run it at idle.
4. Select the PID/DATA MONITOR AND RECORD
function on the NGS display.
5. Select the following PIDs.
Except for wagon ATX
• A/C SW
• IACV
• PSPSW
• RPM
For wagon ATX
• ACCS
• IAC
• PSP
• RPM
6. Turn the electrical loads on and verify that the
engine speed is within the specification.
• If not as specified, carry out the following.
— A/C switch inspection
— PSP switch inspection
— IAC valve inspection
Note
Excludes temporary idle speed drop just after
the loads are turned on.
Specification
Load
condition
ldle-up speed (rpm)*1
MTX
ATX
N,P
position
D range
E/L ON*2
550— 750 550—750 550—750
A/CON*3
550—750 550—750 550—750
P/S ON*4 550—750 550—750 550—750
*
2
-
* 3:
*4 -
electrical loads (E/L) are turned on.
Equal load with
• Headlight
• Fan switch (3rd or higher)
• Cooling fan
A/C switch and fan switch are turned ON.
Steering wheel turned fully.
Pressure Regulator Control Inspection
Warning
• Fuel line spills and leakage are dangerous.
Fuel can ignite and cause serious injuries
or death and damage. Fuel can also irritate
skin and eyes. To prevent this, always
complete the “BEFORE REPAIR
PROCEDURE”. (See Section F)
1. Install the fuel pressure gauge.
2. Measure the fuel pressure under the following
conditions.
• If the fuel pressure is not within the
specification, carry out either Inspection 1 or
Inspection 2 as required.
Specification
Fuel pressure ( kPa { kgf/cm2 , psi })
Idling
210—260
{2.1—2.6,
30—36}
210—260
{2.1—2.6,
30—36}
260—310
{2.6—3.2,
37—46}
During 60
sec. of hot
start*
260—310
{2.6—3.2,
37—46}
After 60 sec.
of hot start*
210—260
{2.1—2.6,
30—36}
Judging Normal
Not normal
(Perform
Inspection
V
Not normal
(Perform
Inspection
2)
* Engine coolant temperature is above 90 °C {194 °F}
and intake air temperature is above 90 °C {194 °F}
Inspection 1
1. Connect the SSTs (NGS) to DLC.
PROGRAM CARD
NGS SET
F1-150