1A-155 Engine General Information and Diagnosis:
DTC Troubleshooting
NOTE
Before this trouble shooting is performed, read the precautions for DTC troubleshooting referring to
“Precautions For DTC Troubleshooting: ”.
Step
Action
Yes
No
1
Was “Engine and Emission Control System Check”
performed?
Go to Step 2.
Go to “Engine and
Emission Control
System Check: ”.
2
A/C refrigerant pressure sensor power supply circuit
check
1) Disconnect connector from A/C refrigerant pressure
sensor with ignition switch turned OFF.
2) Check for proper connection of A/C refrigerant pressure
sensor at “GRY/RED”, “GRY/BLK” and “GRY/GRN” wire
terminals.
3) Turn ON ignition switch, measure voltage between
engine ground and “GRY/RED” wire terminal of A/C
refrigerant pressure sensor connector.
Is voltage 4 – 6 V?
Go to Step 5.
Go to Step 3.
3
A/C refrigerant pressure sensor power supply circuit
check
1) Disconnect connectors from ECM with ignition switch
turned OFF.
2) Measure resistance between “GRY/RED” wire terminal
of A/C refrigerant pressure sensor connector and “C37-
14” terminal of ECM connector.
Is resistance below 3
Ω
?
Go to Step 4.
“GRY/RED” wire is open
circuit.
4
A/C refrigerant pressure sensor power supply circuit
check
1) Measure resistance between engine ground and “C37-
14” terminal of ECM connector.
Is resistance infinity?
Go to Step 6.
“GRY/RED” wire is
shorted to ground
circuit.
5
A/C refrigerant pressure sensor signal circuit check
1) Connect connectors to ECM.
2) Turn ON ignition switch, measure voltage between
engine ground and “GRY/BLK” wire terminal of A/C
refrigerant pressure sensor connector.
Is voltage 4 – 6 V?
Go to Step 7.
Go to Step 6.
6
A/C refrigerant pressure sensor signal circuit check
1) Disconnect connectors from ECM with ignition switch
turned OFF.
2) Measure resistance between engine ground and “C37-
12” terminal of ECM connector.
Is resistance infinity?
Go to Step 7.
“GRY/BLK” wire is
shorted to ground
circuit.
7
A/C refrigerant pressure sensor check
1) Check A/C refrigerant pressure sensor referring to “A/C
Refrigerant Pressure Sensor and Its Circuit Inspection:
in Section 7B”
Is it in good condition?
Substitute a known-
good ECM and recheck.
Faulty A/C refrigerant
pressure sensor.
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