1A-85 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 IAT sensor and its circuit check
1) Connect scan tool to DLC with ignition switch turned
OFF.
2) Turn ignition switch to ON position.
3) Check intake air temp. displayed on scan tool.
Is –40
°
C (–40
°
F) or 119
°
C (246
°
F) indicated?
Go to Step 3. Intermittent trouble.
Check for intermittent
referring to “Intermittent
and Poor Connection
Inspection: in Section
00”.
3 Wire harness check
1) Disconnect MAF and IAT sensor connector (1) with
ignition switch turned OFF.
2) Check for proper connection to MAF and IAT sensor
connector (1) at “LT GRN” and “GRY/GRN” wire
terminals.
3) If OK, then with ignition switch turned ON, measure
voltage between “LT GRN” wire terminal of MAF and IAT
sensor connector and vehicle body ground.
Is measured voltage applied to “LT GRN” wire terminal about
4 – 6 V?
Go to Step 8. Go to Step 4.
4 ECM voltage check
1) Turn OFF ignition switch.
2) Remove ECM from its bracket with ECM connectors
connected.
3) Check for proper connection of ECM connector at “C37-
25” terminal.
4) If OK, then turn ON ignition switch, measure voltage
between “C37-25” terminal of ECM connector and
vehicle body ground.
Is voltage about 4 – 6 V at terminal?
“LT GRN” wire is open
circuit.
If wire and connection
are OK, go to Step 5.
Go to Step 5.
I5JB0A110037-02
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