Suzuki Grand Vitara XL-7 Service Manual page 92

6-32 ENGINE DIAGNOSIS (RHZ ENGINE WITH SINGLE-CONNECTOR ECM)
TROUBLESHOOTING
STEP
1 Was "ENGINE DIAG. FLOW TABLE" performed?
2 MAF sensor power supply Check:
1) With ignition switch OFF, disconnect MAF sensor
coupler.
2) With ignition switch ON, check voltage between
"BLK/WHT" wire terminal of MAF sensor coupler and
ground.
Is voltage 10 – 14 V?
3 MAF sensor output voltage Check:
1) With ignition switch OFF, connect MAF sensor
coupler.
2) Remove ECM (PCM) cover.
3) Start engine and check voltage between C51-13 and
C51-33 terminal at idle speed.
Is voltage about 2 V?
NOTE:
If DTC is checked using generic scan tool only and DTC P0101 (P0100) Diag. Flow Table is not performed
yet, go to the table before ECM replacement.
ACTION YES
Go to Step 2. Go to "ENGINE
DIAG. FLOW
TABLE".
Go to Step 3. Faulty "BLK/WHT"
wire.
Poor C51-13 Faulty "PPL/WHT"
connection, Faulty wire.
"BRN" wire and Poor MAF sensor
Poor C51-22 coupler terminal
connection. connection.
If OK, substitute If wire and connec-
a known-good tion are OK, substi-
ECM and recheck. tute a known-good
(See NOTE) MAF sensor and
recheck.
NO