Dtc Pl607: Malfunction In Ecm Internal Circuit - Honda EP3 Service Manual

PGM-FI System
DTC Troubleshooting (cont'd)
10. Measure voltage between ECI\4 connectorterminal
A26 and body ground.
ECM CONNECTOR
A (31P)
1 2 3
4 5 6 1 7 I
0 1 1 1 2 1 . / 61,/ 18 I 2C2l
23 24 21 m
30
TDC {GRN}
Wire side oI temale terminals
ls there about 5 V ?
YES - Repair open in the wire between the ECM
(426) and CMP sensor B (TDC sensor).1
N O - G o t o s t e p 1 1 .
Turn the ignition switch OFF.
Disconnect ECIM connector A (31P)
Check for continuity between ECM connector
terminal 426 and body ground.
ECM CONNECTOR A {31PI
Wire side of female terminals
ls there continuity?
YES Repair short in the wire between the ECM
(426) and the CMP sensor B (TDC sensor).1
NO Update the ECM if it does not have the latest
software, or substitute a known-good ECM, then
recheck (see page 11-6). lf the symptom/indication
goes away with a known-good ECM, replace the
o r i g i n a l E C M . I
1 1 .
1 2 .
1 1 - 9 6
DTC Pl607: Malfunction in ECM Internal
Circuit
1. Resetthe EC|\il lsee page 11-4).
2 , T u r n t h e i g n i t i o n s w i t c h O N ( l l ) , a n d w a i t f o r
40 seconds.
ls DTC P 1607 indicated?
YES Update the ECM if it does not have the latest
software, or substitute a known-good ECM, then
recheck (see page 11 6). lf 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 Intermittent failure, system is OK at this time.
A low battery can cause this problem . Ask the
customer if there has been any recent trouble
s t a r t i n g t h e e n g i n e . l
\