A/F Sensor No Activity Detected; Secondary Ho2S Circuit Low Voltage - Honda Civic 2002-2003 Service Manual

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OTC P0134: NF Sensor (Sensor 1) No Activity
Detected
1. Check the attachment state of the A/F sensor
(Sensor 1).
Is it slacked from the exhaust pipe?
YES- Reinstall the A/F sensor (Seneor 1) (see page
11-113) .•
NO-Go to step 2.
2. Resetthe ECM (see page 11-4).
3. Start the engine. Hold the engine speed at
3,000rpm with no load (in neutral) until the radiator
fan comes on, then let it idle for 2 minute.
Is OTe P0134 indicated?
YES-Replace the A/F sensor (Seneor 1) (see page
11-113) .•
NO-Intermittent failure, sistem is OK at this time,
Check for poor connections or loose terminals at
the A/F sensor (Seneor 1) and the ECM .•
OTC P0137: Secondary H02S (Sensor 2)
Circuit Low Voltage
1. Resetthe ECM (see page 11-4).
2. Start the engine. Hold the engine at 3,000 rpm with
no load (in neutral) until the radiator fan comes on.
3. Check the secondary H02S (Sensor 2) output
voltage at 3,000 rpm with the scan tool.
Is there 0.3 V or less?
YES-Go to step 4.
NO-Intermittent failure, system is OK at this time.
Check for poor connections or loose terminals at
the secondary H02S (Sensor 2) and at the ECM .•
4. Turn the ignition switch OFF.
5. Disconnect the secondary H02S (Sensor 2) 4P
connector.
6. Turn the ignition switch ON
(II).
7. Check the secondary H02S (Sensor 2) output
voltage with the scan tool.
Is there 0.3 V or less?
YES-Go to step 8.
NO-Replace the secondary H02S (Sensor 2) .•
8. Turn the ignition switch OFF.
9. Disconnect ECM connector E (31P) .
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