Suzuki Grand Vitara XL-7 Service Manual page 153

6-1-14 ENGINE DIAGNOSIS (RHZ ENGINE WITH TRIPLE-CONNECTOR ECM)
TROUBLESHOOTING
STEP
1 Was "ENGINE DIAG. FLOW TABLE" performed?
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?
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/RED" and
"BRN/BLU" wire terminals.
3) If OK, then with ignition switch ON, is voltage
applied to "PPL/RED" wire terminal of harness
side about 5 V?
4 Does scan tool indicate –40_C (–40_F) at Step 2?
5 Check Wire Harness.
1) Disconnect MAF sensor connector.
2) Check intake air temp. displayed on scan tool.
Is –40_C (–40_F) indicated?
6 Check Wire Harness.
1) Using service wire, connect MAF sensor (built-in
IAT sensor) connector terminals. (between
"PPL/RED" wire terminal and "BRN/BLU" 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?
ACTION YES
Go to Step 2. Go to "ENGINE DIAG.
FLOW TABLE".
Go to Step 3. Intermittent trouble.
Check for intermittent
referring to "Intermittent
and Poor Connection"
in Section 0A.
Go to Step 4. "PPL/RED" wire open
or shorted to power, or
poor E228-28
connection.
If wire and connection
are OK, substitute a
known-good ECM and
recheck.
Go to Step 6. Go to Step 5.
Replace MAP "PPL/RED" wire
sensor. shorted to ground.
If wire is OK, substitute
a known-good ECM
and recheck.
Replace MAF "BRN/BLU" wire open
sensor (built-in IAT or poor E228-30
sensor). connection.
If wire and connection
are OK, substitute a
known-good ECM
and recheck.
NO