Honda Civic Service Manual page 291

PGM-FI System
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DTG Troubleshooting (cont'dl
DTC Pl157: Ay'F Sensor (Sensor 1) Range/
Performance Problem
1 . R e s e t t h e E C I M ( s e e p a g e 1 1 - 4 ) .
2. Start the engine.
l s D T C P l 1 5 7 i n d i c a t e d ?
YES-Go to step 3.
NO Intermittent failure, system is OK at this time.
Check for poor connections or loose terminals at
the Ay'F sensor (Sensor 1 ) and at the ECN4.I
Turn the ignition switch OFF.
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 ) .
Connect A,/F sensor (Sensor 1) 4P connector
t e r m i n a l s N o . 1 a n d N o . 2 w i t h a j u m p e r w i r e .
A/F SENSOR (SENSOR 1) 4P CONNECTOR
AFS+ {BLU)
Wire side of female terminals
3 .
JUMPER WIRE
1 1 - 8 4
L
6. Check for continuity between ECM connector
t e r m i n a l s 4 6 a n d A 1 6 .
ECM CONNECTOR A {3IP)
Wire side of female terminals
ls there continuity?
YES Go to step 9.
NO Go to step 7.
Connect A/F sensor (Sensor 1) 4P connecror
t e r m i n a l N o . 1 t o b o d y g r o u n d w i t h a j u m p e r w i r e .
A/F SENSOR {SENSOR 1I 4P CONNECTOR
7 .
Wire side ot female terminals