Table of Contents
Advertisement
INSPECTION
Step
1
Was "ENGINE DIAG. FLOW TABLE" per-
formed?
2
Check HO2S-2 Heater and Its Circuit.
1) Warm up engine to normal operating tem-
perature.
2) Stop engine.
3) Turn ignition switch ON and check voltage
at terminal C41-4 See Fig. 1. Voltage
should be over 10 V.
4) Start engine, run it at idle and check voltage
at the same terminal after 1 min. from
engine start.
Voltage should be below 1.9 V.
Are check result as specified?
3
Check Heater of Sensor-2.
1) Disconnect HO2S-2 coupler with ignition
switch OFF.
2) Check for proper connection to HO2S-2 at
"BLK/WHT" and "PNK/BLU" wire terminals.
3) If OK, then check heater resistance.
Is it 12.0 – 14.3 Ω at 20°C, 68°F?
Fig. 1 for Step 2
Action
ENGINE GENERAL INFORMATION AND DIAGNOSIS 6-75
Yes
Go to Step 2.
Intermittent trouble.
Check for intermittent
referring to "Intermittent
and Poor Connection" in
Section 0A.
"PNK/BLU" wire open or
shorted to ground or poor
connection at C41-4. If
wire and connection are
OK, substitute a known-
good ECM and recheck.
No
Go to "ENGINE DIAG.
FLOW TABLE".
Go to Step 3.
Replace HO2S-2.
Advertisement
Table of Contents
