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Toyota Corolla Repair Manual: Malfunction in tachometer

Wiring diagram

Inspection procedure

Inspection procedure

  1. Check output value of ecm.
  1.  Connect the handheld tester to dlc3.
  2. Turn the ignition switch to on and push the handheld tester main switch on.
  3.  Select the data list mode on the handheld tester.

2 Inspect combination meter assy

2 Inspect combination meter assy

(Reference) inspection using oscilloscope

(Reference) inspection using oscilloscope

  1.  check the input signal waveform.
  1.  Remove the combination meter assy with connectors still connected.
  2.  Connect the oscilloscope to the terminals c919 of combination meter assy and body ground.
  3.  Start engine.
  4.  Check the signal waveform.

3 Check harness and connector(between ecm and combination

3 Check harness and connector(between ecm and combination meter assy)

  1. Remove the combination meter.
  2.  check the continuity between terminals 5 (tach) of ecm and c919 of combination meter connector.

Standard: there is continuity.

Check and replace ecm

Check and replace ecm

Malfunction in speedometer
Wiring diagram Inspection procedure 1 Check combination meter assy Remove the combination meter assy with connector still connected.  check voltage.  Jack up either o ...

Malfunction in fuel receiver gauge
Wiring diagram Inspection procedere 1 Inspect fuel sender gage assy Disconnect the connector fuel sender gauge. check the float position between e and f and measure the resistance betw ...

Other materials:

Circuit description
The intake air temperature (iat) sensor, mounted on the mass air flow (maf) sensor, monitors the intake air temperature. The iat sensor has a thermistor that varies its resistance depending on the temperature of the intake air. When the air temperature is low, the resistance in the thermisto ...

Basic inspection
When the malfunction is not confirmed in the dtc check, troubleshooting should be carried out in all the possible circuits considered as causes of the problem. In many cases, by carrying out the basic engine check shown in the following flowchart, the location causing the problem can be found ...

Malfunction in water temperature receiver gauge
Wiring diagram Inspection procedure 1 Read value of handheld tester Check output value of ecm.  Connect the handheld tester to dlc3.  Turn the ignition switch to on and push the handheld tester main switch on.  Select the data list mode on the handheld teste ...

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