Dtc P0134: A/F Sensor (Sensor 1) No Activity Detected; Dtc P0137: Secondary Ho2S (Sensor 2) Circuit Low Voltage - Honda EP3 Service Manual

DTC P0134: Ay'F Sensor (Sensor 1) No Activity
Detected
1. Check the attachment state of the A,/F sensor
( S e n s o r 1 ) .
ls it slacked f rom the exhaust pipe?
YES- Reinstall the Ay'F sensor (Seneor 1) (see page
1 1 - 1 1 3 ) . t
NO-Go to step 2.
2 . R e s e t t h e E C M ( s e e p a g e 1 1 - 4 ) .
3 . S t a n t h e e n g i n e . H o l d t h e e n g i n e s p e e d a t
3,000rpm with no load (in neutral) until the radiator
fan comes on, then let it idle for 2 minute.
ls DTC PO134 indicated?
YES-Replace the Ay'F sensor {Seneor 1) (see page
1 1 - 1 1 3 ) . t
NO - Intermittent failu re, sistem is OK at this time.
Check for poor connections or loose terminals at
the Ay'F sensor (Seneor 1 ) and the ECM.I
DTC P0137: Secondary HO2S (Sensor 2)
Circuit Low Voltage
1 . R e s e t t h e E C M ( s e e p a g e I 1 - 4 )
2. Start the engine. Hold the engine at 3,000 rpm wilh
no load (in neutral) until the radiator fan comes on.
3. Check the secondary HO2S (Sensor 2) output
voltage at 3,000 rpm with the scan tool.
ls there 0.3 V or less?
YES Go to step 4.
NO-lntermittent failure, system is OK at this time.
Check for poor connections or loose terminals at
the secondary HO2S (Sensor 2) and at the ECM.I
T u r n t h e i g n i t i o n s w i t c h O F F .
Disconnect the secondary HO2S (Sensor 2) 4P
connector.
Turn the ignition switch ON (ll).
Check the secondary HO2S (Sensor 2) output
voltage with the scan tool.
ls there 0.3 V or less?
YES Go to step 8.
N O R e p l a c e t h e s e c o n d a r y H O 2 S ( S e n s o r 2 ) . 1
Turn the ignition switch OFF.
D i s c o n n e c t E C M c o n n e c t o r E ( 3 1 P ) .
i c o n t ' d )
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