Honda NSS250S Manual page 593

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If the tachometer needle shows initial function, but
tachometer does not move with the engine starts,
check as follows:
Remove the screen garnish (page 3-18).
Connect the peak voltage adaptor to the combina-
tion meter 28P (Gray) connector terminal and
ground with the connector connected.
TOOLS:
Imrie diagnostic tester (model 625) or
Peak voltage adaptor
with commercially available digital multimeter
(impedance 10 MΩ/DCV minimum)
CONNECTION: Blue/yellow (+) – ground (–)
Start the engine and measure the tachometer input
peak voltage.
PEAK VOLTAGE: 10.5 V minimum
If the value is normal, replace the combination
meter printed circuit board.
If the measured value is below 10.5 V, replace the
PCM.
If the value is 0 V, inspect the following:
– Inspect the tachometer signal line open circuit
with test probe (page 22-23)
– Inspect the tachometer signal line open circuit
with test harness (page 22-23)
TACHOMETER SIGNAL LINE OPEN CIRCUIT
INSPECTION WITH TEST PROBE
Disconnect the following:
– Combination meter 28P (Gray) connector (page
22-10)
– ECM 33P (Black) connector (page 6-98)
Check the continuity between the combination
meter and ECM 33P connectors of the wire side.
TOOL:
Test probe
CONNECTION: Blue/yellow – Blue/yellow
There should be continuity.
If there is no continuity, check for open circuit in
Blue/yellow wire.
TACHOMETER SIGNAL LINE OPEN CIRCUIT
INSPECTION WITH TEST HARNESS
Connect the test harness between the wire harness
and ECM 33P connector (page 6-17).
Disconnect the combination meter 28P (Gray) con-
nector (page 22-10).
Check the continuity between the test harness and
combination meter connector of the wire side.
CONNECTION: 27 – Blue/yellow
There should be continuity.
If there is no continuity, check for open circuit in
Blue/yellow wire.
28P CONNECTOR
07HGJ-0020100
28P CONNECTOR
(Wire side/female terminal)
28P CONNECTOR
(Wire side/female terminal)
Blue/yellow
07ZAJ-RDJA110
28P CONNECTOR
(Wire side/female terminal)
(27)
TEST HARNESS 33P
LIGHTS/METERS/SWITCHES
Blue/yellow
Blue/yellow
33P CONNECTOR
(Wire side/female terminal)
Blue/yellow
22-23