Toyota Tacoma manuals

Toyota Corolla Repair Manual: Inspection procedure

Hint

:

1 Inspect heated oxygen sensor(heater resistance)

  1. Disconnect the h5 or h8 heated oxygen sensor connector.
  2.  measure the resistance between the terminals of the heated oxygen sensor connector.

Standard:

Standard:

  1. Reconnect the heated oxygen sensor connector.

2 Inspect efi relay

2 Inspect efi relay

  1. Remove the efi relay from the engine room r/b.
  2.  check for continuity in the efi relay.

Standard:

Standard:

  1. Reinstall the efi relay.

3 Inspect ecm(ht1a or ht1b voltage)

3 Inspect ecm(ht1a or ht1b voltage)

  1. Turn the ignition switch on.
  2.  measure the voltage between the applicable terminals of the e4 and e5 ecm connectors.

Standard:

Standard:

4 Check harness and connector(heated oxygen sensor  ecm,

4 Check harness and connector(heated oxygen sensor ecm, heated oxygen sensor efi relay)

  1. Check the harness and connector between the ecm and heated oxygen sensor connectors.
  1.  Disconnect the h5 or h8 heated oxygen sensor connector.
  2.  Disconnect the e4 or e5 ecm connector.
  3.  Check the resistance between the wire harness side connectors.

Standard (check for open):

Standard (check for open):

Standard (check for short):

Standard (check for short):

  1. Reconnect the heated oxygen sensor connector.
  2.  Reconnect the ecm connector.
  1.  check the harness and connector between the heated oxygen sensor connector and efi relay.
  1.  Disconnect the h5 or h8 heated oxygen sensor connector.
  2.  Remove the efi relay from the engine room r/b.
  3.  Check the resistance between the wire harness side connectors.

Standard (check for open):

Standard (check for open):

Standard (check for short):

Standard (check for short):

  1. Reconnect the heated oxygen sensor connector.
  2.  Reinstall the efi relay.

Replace ecm

Replace ecm

Circuit description
Refer to dtc p0130 Hint: the ecm provides a pulse width modulated control circuit to adjust current through the heater. The heated oxygen sensor heater circuit uses a relay on the b+ side of the ...

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