Honda CR-V 1997 Service Manual page 318

PGM-FI System
Primary Heated Oxygen Sensor (Primary H02S) (Sensor 1) (cont'd)
\ PO'33 \ The scan tool indicates Diagnostic Trouble Code (DTC) P0133: A slow response problem in the Primary Heated
Oxygen Sensor \?rimary \-\02S) \Sensor '\) circuit.
Description
By controlling the air/fuel ratio with a Primary H02S (Sensor 1) and a Secondary H02S (Sensor 2), the deterioration of the
Primary H02S (Sensor 1) can be evaluated by its feedback period. When the feedback period of the H02S exceeds a cer-
tain value during stable driving conditions, the sensor will be judged as deteriorated.
When deterioration has been detected during two consecutive trips, the MIL comes on and DTC P0133 will be stored.
NOTE: If DTC P0131, P0132 andlor P0135 are stored at the same time as DTC P0133, troubleshoot those DTCs first, then
troubleshoot DTC P0133.
Possible Cause
• Primary H02S (Sensor 1) Deterioration
• Primary H02S Heater (Sensor 1) Deterioration
• Exhaust system leakage
Troubleshooting Flowchart
- The MIL has been reported on.
- DTC P0133 is stored.
Problem Verification:
1. Do the ECM/PCM Reset Pro-
cedure.
2. Connect the scan tool.
3.
Start the engine. Hold the
engine at 3,000 rpm with no
load lin Park or neutral) until
the radiator fan comes on.
4. Connect the SCS service con-
nector.
5. Test-drive under the following
conditions.
- 55 mph (89 km/h) steady
speed
- AfT
in ~ position
([Q]
posi-
tion and Over-Drive ON)*,
(M{T in 5th gear)
- Until readiness code comes
on
Intermittent failure. system is OK
"
NO
at this time. Check for poor con-
Is DrC P0133 indicated?
nections or loose wires at C111
(Primary H02S, Sensor 1) and at
YES
the ECM/PCM.
Replace the Primary H02S (Sen-
sor 1).
*: '99 - 00 models
11-116