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36 CHECK ECM FUNCTION
1. Substitute another known-good ECM to check ECM function. (ECM may be the cause of a problem, but this is the
rarely the case.)
2. Perform initialization of NVIS (NATS) system and registration of NVIS (NATS) ignition key IDs. Refer to “NVIS (NISSAN
VEHICLE IMMOBILIZER SYSTEM — NATS”, EC-92.
© GO TO 4.
Accelerator Pedal Released Position Learning
NFEC1186
DESCRIPTION
NFEC1186S01
“Accelerator Pedal Released Position Learning” is an operation to learn the fully released position of the
accelerator pedal by monitoring the accelerator pedal position sensor output signal. It must be performed each
time harness connector of accelerator pedal position sensor or ECM is disconnected.
OPERATION PROCEDURE
NFEC1186S02
1. Make sure that accelerator pedal is fully released.
2. Turn ignition switch “ON” and wait at least 2 seconds.
3. Turn ignition switch “OFF” wait at least 10 seconds.
4. Turn ignition switch “ON” and wait at least 2 seconds.
5. Turn ignition switch “OFF” wait at least 10 seconds.
Throttle Valve Closed Position Learning
NFEC1187
DESCRIPTION
NFEC1187S01
“Throttle Valve Closed Position Learning” is an operation to learn the fully closed position of the throttle valve
by monitorizing the throttle position sensor output signal. It must be performed each time harness connector
of electric throttle control actuator or ECM is disconnected.
OPERATION PROCEDURE
NFEC1187S02
1. Turn ignition switch “ON”.
2. Turn ignition switch “OFF” wait at least 10 seconds.
Make sure that throttle valve moves during above 10 seconds by confirming the operating sound.
Idle Air Volume Learning
NFEC1188
DESCRIPTION
NFEC1188S01
“Idle Air Volume Learning” is an operation to learn the idle air vol-
ume that keeps each engine within the specific range. It must be
performed under any of the following conditions:
I Each time electric throttle control actuator or ECM is replaced.
I Idle speed or ignition timing is out of specification.
PREPARATION
NFEC1188S02
Before performing “Idle Air Volume Learning”, make sure that all of
the following conditions are satisfied.
Learning will be cancelled if any of the following conditions are
missed for even a moment.
I Battery voltage: More than 12.9V (At idle)
I Engine coolant temperature: 70 - 99°C (158 - 210°F)
I PNP switch: ON
I Electric load switch: OFF
(Air conditioner, headlamp, rear window defogger)
On vehicles equipped with daytime light systems, set
lighting switch to the 1st position to light only small
lamps.
I Steering wheel: Neutral (Straight-ahead position)
GI
MA
EM
LC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
BASIC SERVICE PROCEDURE
Idle Speed/Ignition Timing/Idle Mixture Ratio Adjustment (Cont’d)
EC-71
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