Honda Civic Service Manual page 293

PGM-FI System
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a
DTC Troubleshooting (cont'd)
6. Substitute a known-good Ay'F sensor (Sensor 1)and
recheck.
Is DTC P1158 ind icated?
YES Update the ECM if it does not have the latest
software, or substitute a known-good ECM, then
recheck (see page 1 1-6). if the symptom/indication
goes away with a known-good ECM, replace the
o r i g i n a l E C M . I
NO- Replace the Ay'F sensor (Sensor 1). t
1 1 - 8 6
DTC Pl159: A,/F Sensor (Sensor 1) AFS +
Terminal Low Voltage
1 . R e s e t t h e E C M ( s e e p a g e 1 1 - 4 ) .
2. Sta rt the engine.
ls DTC P1159 ind icated?
YES-Go to step 3.
NO-lntermiftent failure. system is OK at this time.
Check for poor connections or loose terminais at
the A,/F sensor (Sensor 1) and at the ECM.I
3. Turn the ignition switch OFF.
4. Disconnect the Ay'F sensor (Sensor 1) 4P connector
a n d E c M c o n n e c t o r A ( 3 1 P ) .
5. Check for continuity between ECM connector
terminal 46 and body ground.
ECM CONNECTOR A {31PI
Wire side of female terminals
ls there continuity?
YES-Repair short in the wire between the Ay'F
s e n s o r ( S e n s o r 1 ) a n d t h e E C M ( A O ) . I
NO Go to step 6.