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On Board Diagnosis Logic
NFEC1460
This self-diagnosis has the one trip detection logic.
DTC No.
Trouble diagnosis
name
DTC Detecting Condition Possible Cause
P1229
1229
Sensor power supply
circuit short
ECM detects a voltage of power source for sensor
is excessively low or high.
I Harness or connectors
(The TP sensor 1 and 2 circuit is
shorted.)
(APP sensor circuit is shorted.)
(MAF sensor circuit is shorted.)
(EVAP control system pressure sen-
sor circuit is shorted.)
(Power steering pressure sensor cir-
cuit is shorted.)
(Refrigerant pressure sensor circuit is
shorted.)
I Electric throttle control actuator
(TP sensor 1 and 2)
I Accelerator pedal position sensor
(APP sensor 1)
I MAF sensor
I EVAP control system pressure sensor
I Power steering pressure sensor
I Refrigerant pressure sensor
I ECM pin terminal
FAIL-SAFE MODE
NFEC1460S01
When the malfunction is detected, ECM enters in fail-safe mode and the MIL lights up.
Engine operation 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
NFEC1461
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.
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”.
2) Select “DATA MONITOR” mode with CONSULT-II.
3) Start engine and let it idle for 1 second.
4) If DTC is detected, go to “Diagnostic Procedure”, EC-570.
GI
MA
EM
LC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P1229 SENSOR POWER SUPPLY
On Board Diagnosis Logic
EC-567
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