Suzuki GRAND VITARA XL-7, Руководство по обслуживанию

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ENGINE DIAGNOSIS (RHZ ENGINE WITH SINGLE-CONNECTOR ECM) 6-35
TROUBLESHOOTING
STEP ACTION YES NO
1 Was “ENGINE DIAG. FLOW TABLE” performed? Go to Step 2. Go to “ENGINE DIAG.
FLOW TABLE”.
2 Check IAT Sensor and Its Circuit.
1) Connect scan tool with ignition switch OFF.
2) Turn ignition switch ON.
3) Check intake air temp. displayed on scan tool.
Is – 40
_
C (– 40
_
F) or 131
_
C (268
_
F) indicated?
Go to Step 3. Intermittent trouble.
Check for intermittent
referring to “Intermittent
and Poor Connection”
in Section 0A.
3 Check Wire Harness.
1) Disconnect MAF sensor (built-in IAT sensor)
connector with ignition switch OFF.
2) Check for proper connection to MAF sensor
(built-in IAT sensor) at “PPL / GRN” and “BRN” wire
terminals.
3) If OK, then with ignition switch ON, is voltage
applied to “PPL / GRN” wire terminal of harness
side about 5 V?
Go to Step 4. “PPL / GRN” wire open
or shorted to power, or
poor C51-11
connection.
If wire and connection
are OK, substitute a
known-good ECM and
recheck.
4 Does scan tool indicate – 40
_
C (– 40
_
F) at Step 2? Go to Step 6. Go to Step 5.
5 Check Wire Harness.
1) Disconnect MAF sensor connector.
2) Check intake air temp. displayed on scan tool.
Is – 40
_
C (– 40
_
F) indicated?
Replace MAP
sensor. “PPL / GRN” wire
shorted to ground.
If wire is OK, substitute
a known-good ECM
and recheck.
6 Check Wire Harness.
1) Using service wire, connect MAF sensor (built-in
IAT sensor) connector terminals. (between
“PPL / GRN” wire terminal and “BRN” wire terminal
of harness side)
2) Turn ignition switch ON and check intake air
temp. displayed on scan tool.
Is 131
_
C (268
_
F) indicated?
Replace MAF
sensor (built-in IAT
sensor). “BRN” wire open or
poor C51-22
connection.
If wire and connection
are OK, substitute a
known-good ECM
and recheck.