6-32
ENGINE DIAGNOSIS (RHZ ENGINE WITH SINGLE-CONNECTOR ECM)
TROUBLESHOOTING
STEP
ACTION
YES
NO
1
Was “ENGINE DIAG. FLOW TABLE” performed?
Go to Step 2.
Go to “ENGINE
DIAG. FLOW
TABLE”.
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?
Go to Step 3.
Faulty “BLK / WHT”
wire.
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?
Poor C51-13
connection, Faulty
“BRN” wire and
Poor C51-22
connection.
If OK, substitute
a known-good
ECM and recheck.
(See NOTE)
Faulty “PPL / WHT”
wire.
Poor MAF sensor
coupler terminal
connection.
If wire and connec-
tion are OK, substi-
tute a known-good
MAF sensor and
recheck.
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.
