Section III Steps for Trouble Diagnosis with DTC
I LF Self-developed Engine (LF481Q3)
1. A/C evaporator outlet temperature sensor (see Table 1-3)
Table 1-3
Diagnostic Trouble Code (DTC) Trouble Location or Type
P1535 A/C evaporator temperature circuit high input---short or open to power supply
P1536 A/C evaporator temperature circuit high input---short to ground
P1545 A/C high pressure switch or relay circuit trouble
S/N Operation Test Results Actions
1 Ignition switch in position ON. Next step
Yes Next step
2
Disconnect the A/C evaporator outlet temperature sensor
from the harness. Measure the voltage between the two
pins with a multimeter. Is the voltage about 5V?
No 4
Yes Replace sensor
3
Check for open or short circuit between the two pins with
a multimeter.
No Replace ECU
Yes Repair or replace harness
4
Connect an adapter between the ECU and the harness.
Check for open or short circuit between pin J1-09,
J1-3ofthe ECU and the pin (1), (2) of the sensor with a
multimeter.
No Replace ECU
2. Throttle position sensor (see Table 1-4)
Table 1-4
Diagnostic Trouble Code (DTC) Trouble Location or Type
P0122 Throttle/pedal position sensor/switch A circuit input low
P0123 Throttle/pedal position sensor/switch A circuit input high
S/N Operation Test Results Actions
1 Ignition switch in position ON. Next step
Yes Next step
2
Disconnect the throttle position sensor from the harness.
Measure the voltage between pin (1) and pin (2) with a
multimeter. Is the voltage about 5V?
No 5
Yes Next step
3
Measure the resistance between pin (1) and pin (2) with a
multimeter. Is the resistance between 1.6k and 2.4k?
No Replace sensor
Yes Replace sensor
4
Slowly turn the throttle position sensor from one side to
the other side. Check for open or short circuit or a jump
resistance between pin (1) (-) and pin (3) (+) with a
multimeter.
No
Replace ECU
5
Connect an adapter between the ECU and the harness.
Check for open or short circuit between pin J1-20, J1-05,
J1-24 of the ECU and the pin (1), (2), (3) of the sensor
with a multimeter.
Yes Repair or replace harness
To Next Page
Loading...