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Component Description
NFEC1307
Power supply for the Throttle Control motor is provided to the ECM via throttle control motor relay. The throttle
control motor relay is ON/OFF controlled by the ECM. When the ignition switch is turned ON, the ECM sends
an ON signal to throttle control motor relay and battery voltage is provided to the ECM. When the ignition switch
is turned OFF, the ECM sends an OFF signal to throttle control motor relay and battery voltage is not pro-
vided to the ECM.
CONSULT-II Reference Value in Data Monitor
Mode
NFEC1319
Specification data are reference values.
MONITOR ITEM CONDITION SPECIFICATION
THRTL RELAY I Ignition switch: ON ON
On Board Diagnosis Logic
NFEC1450
DTC No.
Trouble diagnosis
name
DTC Detecting Condition Possible Cause
P1124
1124
Throttle control motor
relay circuit short
ECM detect the throttle control motor relay is stuck
ON.
I Harness or connectors
(Throttle control motor relay circuit is
shorted)
I Throttle control motor relay
P1126
1126
Throttle control motor
relay circuit open
ECM detects a voltage of power source for throttle
control motor is excessively low.
This self-diagnosis has the one trip detection
logic.
I Harness or connectors
(Throttle control motor relay circuit is
open)
I Throttle control motor relay
FAIL-SAFE MODE
NFEC1450S01
When the malfunction is detected, ECM enters in fail-safe mode (for DTC P1124).
When the malfunction is detected, ECM enters in fail-safe mode and the MIL lights up (for DTC P1126).
Engine operating condition in fail-safe mode
ECM stops the electric throttle control actuator control, throttle valve is maintained at a fixed opening (approx. 5 degrees) by the
return spring.
DTC Confirmation Procedure
NFEC1451
NOTE:
If “DTC Confirmation Procedure” has been previously conducted,
always turn ignition switch “OFF” and wait at least 10 seconds
before conducting the next test.
PROCEDURE FOR DTC P1124
TESTING CONDITION:
Before performing the following procedure, confirm that bat-
tery voltage is more than 10V at idle.
SEF058Y
With CONSULT-II
1) Turn ignition switch “ON” and wait at least 1 second.
2) Select “DATA MONITOR” mode with CONSULT-II.
3) If 1st trip DTC is detected, go to “Diagnostic Procedure”,
EC-484.
With GST
Follow the procedure “With CONSULT-II” above.
GI
MA
EM
LC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P1124, P1126 THROTTLE CONTROL MOTOR RELAY
Component Description
EC-481
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