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TROUBLESHOOTING
Step
1
Check Evaporator Temp. Sensor
1) Disconnect connectors from ECM with igni-
tion switch turned OFF.
2) Check for proper connection to "G91-15"
and "G91-35" wire terminals of ECM con-
nector.
3) If OK, measure resistance between "G91-
15" and "G91-35" wire terminals of ECM
connector. (See Fig. 1.)
At 0°C: 6.3 – 7.0 kΩ
At 25°C: 1.8 – 2.2 kΩ
Is it within specification?
2
Check A/C signal
1) Measure voltage between "G91-30" wire
terminal of ECM connector and vehicle
body ground under the following condition.
With ignition switch ON and A/C switch
OFF: 10 – 14 V
With ignition switch ON, A/C and heater
blower switch ON: 0 – 1 V
Is check result as specified?
3
Check A/C signal
1) Connect connectors to ECM with ignition
switch turned OFF.
2) Measure voltage between "G91-30" wire
terminal of ECM connector and vehicle
body ground under the following condition.
With ignition switch ON and A/C switch
OFF: 10 – 14 V
With ignition switch ON, A/C and heater
blower switch ON: 0 – 1 V
Is check result as specified?
4
Check A/C Condenser Fan Control System
Is A/C cooling fan started when A/C and heater
blower switch turned ON?
5
Check Condenser Fan Control Circuit
1) Check DTC with scan tool.
Is DTC P0481 displayed?
6
Check Condenser Fan Relay
1) Check A/C condenser fan relay No.1 and
No.2 referring to "Condenser Cooling Fan
Relay (No.1 and No.2) Inspection" in Sec-
tion 1B.
Are check result satisfactory?
Action
ENGINE GENERAL INFORMATION AND DIAGNOSIS 6-179
Yes
Go to Step 2.
Go to Step 3.
Go to Step 4.
Go to Step 8.
Go to "DTC P0481 Fan 2
(A/C Condenser Fan)
Control Circuit" in this
section.
Go to Step 7.
No
Faulty A/C evaporator
temperature sensor or its
circuit.
A/C and heater blower
switch circuit, A/C refrig-
erant pressure switch or
heater controller malfunc-
tion.
Poor "G91-30" terminal
connection.
If OK, substitute a known–
good ECM and recheck.
Go to Step 5.
Go to Step 6.
Replace A/C condenser
fan relay No.1 and No.2.
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