ENGINE GENERAL INFORMATION AND DIAGNOSIS (G16/J20 ENGINES) 6-81
TROUBLESHOOTING (DTC P0141)
Step Action Yes No
1Was “Engine Diag. Flow Table” performed? Go to Step 2. Go to “Engine Diag. Flow
Ta bl e ”.
2 HO2S-2 Heater Check :
1) Disconnect HO2S-2 coupler with ignition
switch OFF.
2) Check resistance between “PNK/GRN” wire
terminal and “BLK/WHT” wire terminal of
HO2S-2 connector.
Is it within 11.7 – 14.3 W (at 20°C, 68°F)?
Go to Step 3. Replace HO2S-2.
3 HO2S-2 Power Supply Check :
1) Connect HO2S-2 connector.
2) Check voltage between E61-3 terminal of
ECM (PCM) connector and body ground
with ignition switch ON.
Is it 10 – 14 V?
Go to Step 4. “BLK/WHT” or “PNK/
GRN” circuit open/shorted
to ground.
If wire and connections
are OK, substitute a
known-good ECM (PCM)
and recheck.
4 HO2S-2 Heater Operation Check :
1) Drive vehicle about 30 – 40 mph (50 – 60
km/h) for 2 min. or more.
2) Stop vehicle and check voltage between
E61-3 terminal of ECM (PCM) connector
and body ground with engine idling.
Is it 0 – 1 V?
Intermittent trouble.
Check intermittent refer-
ring to “Intermittent and
Poor Connection” in Sec-
tion 0A.
Poor E61-3 connection.
If connection is OK, sub-
stitute a known-good
ECM (PCM) and recheck.
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