Honda CR-V 1997 Service Manual page 322

PGM-FI System
Secondary Heated Oxygen Sensor (Secondary H02S) (Sensor 2) (cont'd)
I
P0139
I
The scan tool indicates Diagn ostic Trouble Code (DTC) P0139: A slow response problem in the Secondary Heated
Oxygen Sensor (H02S) (Sensor 2) circuit.
- The MIL has been reported on.
- OTC P0139 is stored.
Problem verification:
,
.
Do the ECM/ PCM Reset Pro-
cedure .
2. Start the engi n e . Hold the
engine al 3,000 rpm with no
load (in Park or noutra l) until
t he radiator fan comes on.
3. Check the Secondary H02S
(Sensor 2) output at 3,000 rpm
with the scan tool.
Intermittent failure, system is OK
NO
at this time. Check for poor con-
Does the vo ltage stay within
nactions or loose wir.s at
e127
0.3 - 0.6 V for two m inutes?
U~lt.d
on ECM/PCM bracketl.
C721 (Secondary H02S, Sensor 21
YES
and at the ECM/PCM.
Replace the Sec:ondary H0 2S
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(Sensor 2) .
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