Troubleshooting - Honda 2004 Odyssey Service Manual

Engine Mount Control System

Troubleshooting

Special Tools Required
Vacuum pump/gauge, 0 30 in.Hg
A973X-041-XXXXX
NOTE:
• Check the vacuum hoses and lines for damage and
proper connections before troubleshooting.
• Before performing engine mount control system
troubleshooting, check for damage to the suspension,
subframe, body, or exhaust.
Follow this procedure if the engine vibrates excessively
when idling.
1. Warm up the engine to normal operating
temperature (the cooling fan comes on two times).
Is the idle speed less than 7 30 rpm?
YES Go to step 2.
NO Adjust the idle speed (see page 11-201).
2. Fully press the brake pedal.
3. With the transmission in gear, have an assistant
disconnect and reconnect the 2P connector at the
engine mount control solenoid valve.
Is there a noticeable change in idle smoothness
when the engine mount control solenoid valve 2P
connector is disconnected?
YES Reconnect the engine mount control
solenoid valve 2P connector to the solenoid valve.
The engine mount control system is OK.
NO Go to step 4.
4. Shift the transmission to P or N.
5. Disconnect the engine mount control solenoid
valve 2P connector from the engine mount control
solenoid valve.
4-56
6. Measure voltage between the No. 2 terminal and
body ground.
ENGINE MOUNT CONTROL
SOLENOID VALVE 2P CONNECTOR
Is there battery voltage?
YES Go to step 7.
NO Repair an open in the wire between the
engine mount control solenoid valve connector and
No. 6 (15A) fuse in the under-dash driver's fuse/
relay box.
7. Measure voltage between the engine mount
control solenoid valve 2P connector No. 1 terminal
and No. 2 terminal.
ENGINE MOUNT CONTROL
SOLENOID VALVE 2P CONNECTOR
IG 1
(BLK/YEL)
Is there battery voltage?
YES Go to step 8.
NO Repair an open in the wire between powertain
control module (PCM) connector terminal A2
(1999-2000, 2002-2004 models) or E24 (2001 model)
and the engine mount control solenoid valve
connector. If the wire is OK, substitute a known-
good PCM and recheck (see page 11-5).
IG 1
(BLK/YEL)
Wire side of
female terminals
MCS
(GRN/WHT)
Wire side of
female terminals