ENGINE GENERAL INFORMATION AND DIAGNOSIS (H27 ENGINE) 6-1-51
TROUBLESHOOTING
Step Action Yes No
1 Was “ENGINE DIAG. FLOW TABLE” per-
formed?
Go to Step 2. Go to “ENGINE DIAG.
FLOW TABLE” in this
section.
2 Check IAT sensor and its circuit :
1) Connect scan tool with ignition switch OFF.
2) Turn ignition switch ON.
3) Check intake air temp. displayed on scan
tool.
Is – 40°C (– 40°F) or 165°C (329°F) indicated?
Go to Step 3. Intermittent trouble.
Check for intermittent
referring to “INTERMIT-
TENT AND POOR CON-
NECTION” in Section 0A.
3 Check wire harness :
1) Disconnect IAT sensor connector with igni-
tion switch OFF.
2) Check for proper connection to IAT sensor
at “LT BLU” and “GRY/YEL” wire terminals.
If OK, then with ignition switch ON, is voltage
applied to “LT BLU” wire terminal about 4 – 6 V?
Go to Step 4. “LT BLU” wire open or
short, or poor C51-3-1
connection.
If wire and connection are
OK, substitute a known-
good ECM (PCM) and
recheck.
4 Check wire harness :
1) Using service wire, connect IAT sensor con-
nector terminals.
2) Turn ignition switch ON and check intake air
temp. displayed on scan tool.
Is 165°C (329°F) indicated?
Replace IAT sensor. “GRY/YEL” wire open or
poor C51-3-25 connec-
tion.
If wire and connection are
OK, substitute a known-
good ECM (PCM) and
recheck.
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