4-14
2. Troubleshooting:
First:
Maintenance according to fault code from the fault light:
1
)
Maintenance of throttle position sensor
2
)
Maintenance of pressure sensor
1. Fault code 22----t
hrottle position sensor
The figure on the right is the electric diagram
Connect No.1 stitch to ECU No. 25 stitch
Connect No.2 stitch to ECU No. 13 stitch
Connect No.3 stitch to ECU No. 26 stitch
Stitches:
1----output angle signal
2----sensor ground
3----power source 5V
THROTTLE POSITION
SENSOR
Maintenance steps
S/N
Steps
Result
Subsequent steps
1
Open the key switch, run the fuel pump
for 3 seconds by listening (by touching is
also ok)
Next step
2
Extract the sensor plug on the cable.
Check with multimeter to see if the
voltage between No.2 and No.3 stitches is
5V.
YES
Next step
NO
5
3
Check with multimeter to see if the
resistance value between No.2 and No.3
stitches is about 5K
Ω
.
YES
Next step
NO
Replace the sensor
4
Turn the throttle position sensor from one
side to another side gently. At the same
time, check with multimeter to see if
there’s short circuit or broken circuit
between No.1 and No.3 stitches or if the
resistance value changed dramatically.
YES
Replace the sensor
NO
Replace the ECU
5
Check with multimeter to see if there’s
short circuit or broken circuit between
No.13, 25, 26 and No.1, 2, 3 stitches.
YES
Repair or replace
the cable
NO
Replace the ECU
2. Fault code 23----pressure
sensor
The figure on the right is the electric diagram
Connect No.1 stitch to ECU No. 26 stitch
Connect No.2 stitch to ECU No. 12 stitch
Connect No.3 stitch to ECU No. 23 stitch
Stitches:
1----power source 5V
2----output pressure signal
3----sensor ground
Maintenance steps
S/N
Steps
Result
Subsequent steps
1
Open the key switch, run the fuel pump for
3 seconds by listening (by touching is also
ok)
Next step
2
Check to see if the connection between
sensor plug and cable plug is good.
YES
Next step
NO
Repair or replace
the plug
3
Extract the sensor plug on the cable. Check
with multimeter to see if the voltage
between No.1 and No.3 stitches is 5V.
YES
5
NO
Next step
4
Check with multimeter to see if there’s short
circuit or broken circuit between No.12, 13,
26 and No.1, 2, 3 stitches.
YES
Repair or replace
the cable
NO
Next step
5
Replace the pressure sensor to see if the
fault has been handled.
YES
Replace the sensor
NO
Replace the ECU