Mazda 2002 6 - Page 173

CONTROL SYSTEM
F–48–10
*
1
: MTX models
*
2
: ATX models
*
3
: LF, L8 engine models
*
4
: L3 engine models
*
5
: MTX, without ABS models
*
6
: Immobilizer system equipped
*
7
: Immobilizer system not equipped
Inspection Using An Oscilloscope (Reference)
IGT1, IGT2 control signals
PCM terminals
• IGT1(No.1 and No.4): 1A(+)—1D(–)
• IGT2(No.2 and No.3): 1B(+)—1C(–)
Oscilloscope setting
• 4 V/DIV (Y), 0.01 ms/DIV (X), DC range
Vehicle condition
• Idle after warm up (engine speed approx. 650
rpm [MTX] or 700 rpm [ATX], no load, P/S off, A/C
off)
Generator output voltage signal
PCM terminals
• 1AA(+)—2AC(–)
Oscilloscope setting
• 2 V/DIV (Y), 2 ms/DIV (X), DC range
Vehicle condition
• Idle after warm up (engine speed approx. 650
rpm [MTX] or 700 rpm [ATX], no load, P/S off, A/C
off)
HO2S (front) signal
PCM terminals
• 1AB(+)—2H(–)
Oscilloscope setting
• 0.1 V/DIV (Y), 400 ms/DIV (X), DC range
Vehicle condition
• Idle after warm up (engine speed approx. 650
rpm [MTX], 700 rpm [ATX], no load, P/S off, A/C
off)
4AD Fuel injection (#3) Fuel injector No.3
• Inspect using the wave profile.
(See F–48–10 Inspection Using An
Oscilloscope (Reference).)
• Inspect fuel injector
No.3
(See F–31 FUEL
INJECTOR
INSPECTION)
• Inspect related
harness
Terminal Signal Connected to Test condition
Voltage
(V)
Action
0 V
A6A3940W003
0 V
A6A3940W004
0 V
A6A3940W005