Honda 2004 Odyssey Service Manual page 288

Coolant Temperature Gauge Test
1999-2000 models
1. Check the No. 9 (7.5A) fuse in the under-dash fuse/
relay box before testing.
2. Make sure the ignition switch is OFF, then
disconnect the YEL/GRN wire (A) from the coolant
temperature gauge sending unit (B), and ground it
with a jumper wire.
3. Turn the ignition switch ON (II). Check that the
pointer of the coolant temperature gauge starts
moving toward the ''H'' mark. Turn the ignition
switch OFF before the pointer reaches ''H'' on the
gauge dial. Failure to do so may damage the gauge.
• If the pointer of the gauge does not move at all,
check for an open in the YEL/GRN wire. If the
wires are OK, replace the coolant temperature
gauge.
• If the coolant temperature gauge works, test the
coolant temperature gauge sending unit.
A
B
Coolant Temperature Gauge Needle Does
Not Move at All - 2001 model
1. Turn the ignition switch OFF, and connect
powertrain control module (PCM) connector
terminal E14 to body ground with a jumper wire.
PCM CONNECTOR E (31P)
ECTOUT
(YEL/GRN)
Wire side of female terminals
2. Turn the ignition switch ON (ll).
Af ter 30 seconds or more, does the temperature
gauge needle move to the hot side?
YES Substitute a known-good PCM and recheck
(see page 11-5). If the symptom/indication goes
away, replace the original PCM (see page 11-4).
NO Go to step 3.
3. Turn the ignition switch OFF, and disconnect the
negative cable from the battery. Then disconnect
PCM connector E (31P).
(cont'd)
10-5 10-5