6-2-160 ENGINE GENERAL INFORMATION AND DIAGNOSIS (M13 ENGINE)
8 Check A/C Compressor Relay Circuit
1) Check voltage between “E23-11” wire termi-
nal of ECM connector and vehicle body
ground under the following condition.
While engine running and A/C switch OFF:
10 – 14 V
While engine running, A/C and heater
blower switch ON: 0 – 1 V
Are check result satisfactory?
Go to Step 9. Go to Step 10.
9 Check A/C Compressor Relay
1) Check A/C compressor relay referring to “A/
C Compressor Relay Inspection” in Section
1B.
Is it in good condition?
A/C Compressor drive cir-
cuit malfunction.
Replace A/C compressor
relay.
10 Check A/C Compressor Relay Circuit
1) Remove A/C compressor relay with ignition
switch turned OFF.
2) Turn ON ignition switch, check voltage
between “BLU/YEL” wire terminal of A/C
compressor relay connector and vehicle
body ground.
Is voltage 10 –14 V?
Go to Step 12. “BLU/YEL” wire circuit
open.
11 Check A/C Compressor Relay
1) Check A/C compressor relay referring to “A/
C Compressor Relay” in Section 1B.
Is it in good condition?
“ORN” wire circuit open.
If OK, substitute a known-
good ECM and recheck.
Replace A/C compressor
relay.
Step Action Yes No
NOTE:
When A/C evaporator thermistor temp. is below 2.5°C (36.5°F), A/C remains OFF (E23-11 terminal volt-
age becomes 0 – 1 V). This condition is not abnormal.
[A]: Fig. 1 for Step 1
[V]: Resistance
[T]: Temperature
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