Ecm Idle Learn Procedure; Ldle Speed Inspection 1 1 - 1 0 - Honda S2000 Service Manual

ldle Control System
ldle Speed Inspection
NOTE:
. Leave the IAC valve connected
. Before checking the idle speed, check these items:
- The MIL has not been reported on
- l g n i t i o n t i m i n g
- Spark plugs
- Ail cleaner
- PC\
system
' On Canadian models. pullthe parking brake lever up.
Start the engine, then check that the headlights are
off.
1. Disconnect the EVAP canister purge valve 2P
connecror.
2. Connect a tachometer.
3, Start the engine. Hold the engine at 3,000 rpm with
no load (in neutral) until the radiator fan comes on,
then let it idle.
4. Check the idle speed with no-load conditions:
headlights. blower fan, radiator fan. and air
conditioner off.
ldle speed should be: 800t50 rpm
5. ldle the engine for 1 minute with the heater fan
switch on Hl and the air conditioner on' then check
t h e i d l e s p e e d .
ldle speed should be: 900a50 rpm
NOTE:
lf the idle speed is not within specification, see
Symptom Chart.
6. Reconnect the EVAP canister purge valve 2P
connecror,
1 1 - 1 0 0
ECM ldle Learn Procedure
The idle learn procedure must be done so that the ECM
can learn the engine idle characteristics.
Do the idle learn procedure whenever you do any of
these actions:
. Disconnect the batterY.
. Replace the ECM or disconnect its connector'
. Reset the ECM.
NOTE. Eras\ng DTCS N\th Honda PGM Testei does
require the idle learn procedure to be done again.
. R e m o v e t h e N o . 6 E C U ( E C M ) ( 1 5 A ) f u s e f r o m t h e
under-dash fuse/relay box.
. Remove the No. 41 BATTERY (100A) fuse from the
under-hood fuse/relay box.
. Remove the PGM-FI main relay.
. Remove the battery wire from the under-hood fuse/
relay box.
. Disconnect any of the connectors from the under-
hood fuse/relay box.
. Disconnect the connector (C404) between the
dashboard wire harness A and dashboard wire
harness B,
. Disconnect the Gl terminal.
. Adjust the idle speed.
To complete the idle learn procedure do this:
1. Make sure all electrical items (A/C, audio, rear
window defogger, lights, etc.) are turned off
2. Startthe engine. Hold the engine speed at 3,000
r p m w i t h n o l o a d ( i n P a r k o r n e u t r a l ) u n t i l t h e
radiator fan comes on, or the engine coolant
t e m p e r a t u r e r e a c h e s 1 7 6 ' F ( 8 0 " ) 2 1 2 " F { 1 0 0 " ) .
3. Let the engine idle for about 5 minutes with the
throftie fully closed and with all electrical items off.
NOTE: lf the radiator fan comes on during this step, the
time when it is operating must not be included in the 5
m i n u t e s .