DTC P1124, P1126 THROTTLE CONTROL MOTOR RELAY
[QG18DE]
DTC P1124, P1126 THROTTLE CONTROL MOTOR RELAY PFP:16119
A
Component Description UBS00BB5
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 EC
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
provided to the ECM.
C
CONSULT-II Reference Value in Data Monitor Mode UBS00BB6
Specification data are reference values.
D
MONITOR ITEM CONDITION SPECIFICATION
THRTL RELAY ● Ignition switch: ON ON
On Board Diagnosis Logic UBS00BB7
E
These self-diagnoses have the one trip detection logic.
DTC No. Trouble diagnosis name DTC detecting condition Possible cause F
● Harness or connectors
P1124 Throttle control motor ECM detects the throttle control motor relay is (Throttle control motor relay circuit is
1124 relay circuit short stuck ON. shorted) G
● Throttle control motor relay
● Harness or connectors
P1126 Throttle control motor ECM detects a voltage of power source for (Throttle control motor relay circuit is H
1126 relay circuit open throttle control motor is excessively low. open)
● Throttle control motor relay
I
FAIL-SAFE MODE
When the malfunction is detected, ECM enters fail-safe mode and the MlL lights up.
Engine operating condition in fail-safe mode J
ECM stops the electric throttle control actuator control, throttle valve is maintained at a fixed opening (approx. 5 degrees) by the return
spring.
K
DTC Confirmation Procedure UBS00BB8
NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at L
least 10 seconds before conducting the next test.
PROCEDURE FOR DTC P1124
TESTING CONDITION: M
Before performing the following procedure, confirm that battery voltage is more than 10V at idle.
With CONSULT-II
1. Turn ignition switch ON and wait at least 1 second.
2. Select “DATA MONITOR” mode with CONSULT-II.
3. If DTC is detected, go to EC-382, "Diagnostic Procedure" .
SEF058Y
EC-379
DTC P1124, P1126 THROTTLE CONTROL MOTOR RELAY
[QG18DE]
With GST
Follow the procedure “With CONSULT-II” above.
PROCEDURE FOR DTC P1126
With CONSULT-II
1. Turn ignition switch ON and wait at least 2 seconds.
2. Select “DATA MONITOR” mode with CONSULT-II.
3. Start engine and let it idle for 5 seconds.
4. If DTC is detected, go to EC-382, "Diagnostic Procedure" .
SEF058Y
With GST
Follow the procedure “With CONSULT-II” above.
EC-380
DTC P1124, P1126 THROTTLE CONTROL MOTOR RELAY
[QG18DE]
Wiring Diagram UBS00BB9
EC
BBWA0694E
EC-381
DTC P1124, P1126 THROTTLE CONTROL MOTOR RELAY
[QG18DE]
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.
TERMI-
WIRE
NAL ITEM CONDITION DATA (DC Voltage)
COLOR
NO.
Throttle control motor power BATTERY VOLTAGE
3 R/W [Ignition switch: ON]
supply (11 - 14V)
BATTERY VOLTAGE
[Ignition switch: OFF]
104 P Throttle control motor relay (11 - 14V)
[Ignition switch: ON] 0 - 1.0V
Diagnostic Procedure UBS00BBA
1. CHECK THROTTLE CONTROL MOTOR RELAY POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect throttle control motor relay harness connector.
BBIA0102E
3. Check voltage between throttle control motor relay terminal 2, 5
and ground with CONSULT-II or tester.
Voltage: Battery voltage
OK or NG
OK >> GO TO 3.
NG >> GO TO 2.
PBIB0575E
2. DETECT MALFUNCTIONING PART
Check the following.
● Harness connectors E10, F48
● Fuse and fusible link connector E23
● 15A fuse
● Harness for open or short between throttle control motor relay and battery
>> Repair or replace harness or connectors.
EC-382
DTC P1124, P1126 THROTTLE CONTROL MOTOR RELAY
[QG18DE]
3. CHECK THROTTLE CONTROL MOTOR RELAY INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT A
1. Disconnect ECM harness connector.
2. Check continuity between ECM terminal 3 and throttle control motor relay terminal 3.
Refer to Wiring Diagram. EC
Continuity should exist.
3. Also check harness for short to ground and short to power. C
OK or NG
OK >> GO TO 4.
NG >> Repair open circuit or short to ground or short to power in harness or connectors. D
4. CHECK THROTTLE CONTROL MOTOR RELAY OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check continuity between ECM terminal 104 and throttle control motor relay terminal 1. E
Refer to Wiring Diagram.
Continuity should exist.
F
2. Also check harness for short to ground and short to power.
OK or NG
OK >> GO TO 5. G
NG >> Repair open circuit or short to ground or short to power in harness or connectors.
5. CHECK THROTTLE CONTROL MOTOR RELAY H
Refer to EC-383, "Component Inspection" .
OK or NG
I
OK >> GO TO 6.
NG >> Replace throttle control motor relay.
6. CHECK INTERMITTENT INCIDENT J
Refer to EC-139, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
K
>> INSPECTION END
Component Inspection UBS00BBB
THROTTLE CONTROL MOTOR RELAY L
1. Apply 12V direct current between relay terminals 1 and 2.
2. Check continuity between relay terminals 3 and 5.
M
Conditions Continuity
12V direct current supply between
Yes
terminals 1 and 2
No current supply No
3. If NG, replace throttle control motor relay.
PBIB0098E
EC-383
