Suzuki 2000 Grand Vitara SQ416, Руководство по обслуживанию

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YH4
GRAND
VITARA
ENGINE DIAGNOSIS (G16 / J20 ENGINES) 6-81
TROUBLESHOOTING (DTC P0400)
STEP ACTION YES NO
1 Was “ENGINE DIAG. FLOW TABLE” performed? Go to Step 2. Go to “ENGINE
DIAG. FLOW
TABLE”.
2 Is there DTC P0403 (EGR circuit malfunction)? Go to DTC P0403
Diag. Flow Table. Go to Step 3.
3 Do you have SUZUKI scan tool? Go to Step 4. Go to Step 6.
4 EGR Valve Operation Check:
1) With ignition switch OFF, install SUZUKI scan tool.
2) Check EGR system referring to Section 6E1.
Is it in good condition? Go to Step 5. Go to Step 6.
5 MAP Sensor Check:
1) Check MAP sensor for performance referring to
Section 6E1.
Is check result satisfactory?
Intermittent trouble
or faulty ECM
(PCM). Check for
intermittent refer-
ring to “Intermittent
and Poor Connec-
tion” in Section 0A. Repair or replace.
6 EGR Valve Power Supply Circuit Check:
1) With ignition switch OFF, disconnect EGR valve
coupler.
2) With ignition switch ON, check voltage between
C04-2 and ground, C04-5 and ground.
Is each voltage 10 – 14 V?
Go to Step 7. Faulty “Bl / B” wire.
7 EGR Valve Stepper Motor Coil Circuit Check:
1) With ignition switch OFF, connect EGR valve coupler
and disconnect ECM (PCM) couplers.
2) Check resistance between C51-3-4 and C51-2-13,
C51-2-14, C51-2-15, C51-2-16.
Is each resistance 20 – 24 at 20
_
C, 68
_
F?
Go to Step 8. Faulty “Lg”, “Lg / W”,
“Lg / R”, “Lg / Y” wire
or EGR valve.
8 MAP Sensor Check:
1) Check MAP sensor for performance referring to
Section 6E1.
Is check result satisfactory?
EGR passage
clogged or EGR
valve malfunction.
If all above are OK,
intermittent trouble
or faulty ECM
(PCM).
Check for intermit-
tent referring to
“Intermittent and
Poor Connection” in
Section 0A. Repair or replace.