Honda Odyssey 2004. Manual — part 121
01
S0X4A00A20336100000DAAT00
11-182
Idle Control System
Component Location Index
IDLE AIR CONTROL (IAC) VALVE
POWER STEERING PRESSURE
(PSP) SWITCH
Troubleshooting, page 11-184
Troubleshooting, page 11-196
*: The illustration shows ’99-00 Models.
03/07/29 09:23:03 61S0X050_110_0182
±
−
−
−
−
−
−
01
S0X4A00K77100090505FAAT00
DTC P0505:
YES
NO
YES
NO
YES
NO
11-183
DTC Troubleshooting
A
Malfunction in Idle Control
System
NOTE: If DTC P1519 is stored at same time as DTC
P0505, troubleshoot DTC P1519 first, then recheck for
DTC P0505.
1. Start the engine. Hold the engine at 3,000 rpm with
no load (in Park or neutral) until the radiator fan
comes on.
2. Check the engine speed at idle with no-load
conditions: headlights, blower fan, rear window
defogger, radiator fan, and air conditioner are not
operating.
Intermittent failure, system is OK at this
time.
If the idle speed is less than 680 rpm, go to
step 3; if it’s 780 rpm or higher, go to step 4.
3. Disconnect the IAC valve 3P connector.
Adjust the idle speed (see page 11-201). If the
idle speed will not adjust properly, clean the
passage in the throttle body, and then adjust it
again.
Replace the IAC valve.
4. Turn the ignition switch OFF.
5. Remove the intake air duct from the throttle body.
6. Start the engine, and let it idle.
7. Put your fingers on the lower port (A) in the throttle
body.
Check the idle speed (see page 11-201). If it’s
out of specification, replace the IAC valve.
Check for vacuum leaks with the throttle valve
completely closed, and repair as needed.
Is the engine r unning at 7 30
50 r pm?
Does the engine speed incr ease or f luctuate?
Does the engine speed dr op?
03/07/29 09:23:04 61S0X050_110_0183
−
−
−
−
−
−
−
−
−
*01
*02
*03
S0X4AZ6K77100091519FAAT00
DTC P1519
’99-00, ’02-04 Models:
YES
NO
YES
NO
YES
NO
YES
NO
11-184
Idle Control System
DTC Troubleshooting (cont’d)
IAC VALVE 3P CONNECTOR
IGP (YEL/BLK)
IAC VALVE 3P CONNECTOR
GND (BLK)
PCM CONNECTOR B (25P)
IACV (BLK/RED)
(’99-00 models:
IACV (BLK/BLU))
IAC Valve
Circuit Malfunction
1. Reset the PCM (see page 11-4).
2. Turn the ignition switch ON (II).
Go to step 3.
Intermittent failure, system is OK at this time.
Check for poor connections or loose terminals at
the IAC valve and at the PCM.
3. Turn the ignition switch OFF.
4. Disconnect the IAC valve 3P connector.
5. Turn the ignition switch ON (II).
6. Measure voltage between IAC valve 3P connector
terminal No. 2 and body ground.
Go to step 7.
Repair open in the wire between the IAC valve
and the PGM-FI main relay.
7. Turn the ignition switch OFF.
8. Check for continuity between body ground and IAC
valve 3P connector terminal No. 1.
Go to step 9.
Repair open in the wire between the IAC valve
and G101.
9. Disconnect PCM connector B (25P).
10. Check for continuity between body ground and
PCM connector terminal B23.
Repair short in the wire between the IAC
valve and the PCM (B23).
Go to step 11.
Wire side of female terminals
Wire side of female terminals
Wire side of female terminals
Is DT C P1519 indicated?
Is ther e batter y voltage?
Is ther e continuity?
Is ther e continuity?
03/07/29 09:23:04 61S0X050_110_0184
−
−
−
−
*04
*05
*06
YES
NO
YES
NO
11-185
IAC VALVE 3P CONNECTOR
JUMPER WIRE
IACV (BLK/RED)
(’99-00 models:
IACV (BLK/BLU))
PCM CONNECTOR B (25P)
IACV (BLK/RED)
(’99-00 models:
IACV (BLK/BLU))
PCM CONNECTOR B (25P)
IACV (BLK/RED)
(’99-00 models:
IACV (BLK/BLU))
11. Connect IAC valve 3P connector terminal No. 3 to
body ground with a jumper wire.
12. Check for continuity between PCM connector
terminal B23 and body ground.
Go to step 13.
Repair open in the wire between the IAC valve
and the PCM (B23).
13. Remove the jumper wire from the IAC valve 3P
connector, then reconnect the IAC valve 3P
connector.
14. Turn the ignition switch ON (II).
15. Measure voltage between body ground and PCM
connector terminal B23.
Substitute a known-good PCM and recheck
(see page 11-5). If the symptom/indication goes
away, replace the original PCM.
Replace the IAC valve.
Wire side of female terminals
Wire side of female terminals
Wire side of female terminals
Is ther e continuity?
Is ther e batter y voltage?
03/07/29 09:23:05 61S0X050_110_0185
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