Honda TRX500FM Service Manual page 474

LIGHTS/METERS/SWITCHES
3. Combination Meter Serial Line Short Circuit
Inspection
Turn the ignition switch OFF.
Disconnect Ihe PCM/ECM 33P (Black) connector [1]
and combination meter 21P connector.
Check for continuity between the wire harness side
PCM/ECM 33P (Black) connector terminal and
ground.
TOOL:
Test probe 07ZAJ·RDJA 110
Connection:
Orange (A21) - ground
Is there continuity?
YES - Short circuit in the Orange wire.
NO - GO TO STEP 4.
4. Combination Meter Serial Une Open Circuit
Inspection
[1 [
Q }-----,
Orange (A21)
Check Ihe continuity between the PCM/ECM 33P
r - - - - - - - - - - - - - - - - ----,
(Black) connector 111 and combination meter 21P (1\1
22·8
connector 12] terminals.
TOOL:
Test probe 07ZAJ·RDJA 110
Connection:
Orange (A2l) - Orange
Is there continuity?
YES - GO TO STEP 5.
NO - Open circuit in the Orange wire.
5. PCMIECM Circuit Inspection
Connect the PCM/ECM
33P
(Black) connector.
Turn the ignition switch ON and wait
5
seconds or
more. Measure resistance atlhe combination meter
21P
connector
[1]
terminals.
Connection: Orange - Green
Is the resistance 0.1 kD - 100 kD ?
YES - Replace the combination meter with a
known good one, and recheck .
NO - Replace the PCM/ECM with a known good
one, and recheck.
[21
\
t,
+
0000006'1
00 000
,
Q
-,
Orange (A21)
Orange
[11
000000
rn-e.;,.O·t>E;e+h
0000000
Green
,