Inspection Procedure

INSPECTION PROCEDURE

1. Connect the OBDII scan tool or LEXUS hand-held tester, and read value of mass air flow rate.





- Remove the fuse cover on the instrument panel.
- Connect the OBDII scan tool or LEXUS hand-held tester to the Data Link Connector 3.
- Turn Ignition Switch ON and OBDII scan tool or LEXUS hand-held tester main switch ON.
- Start the engine.
- Read mass air flow rate on the OBDII scan tool or LEXUS hand-held tester.
- If mass air flow rate 0.0 gm/second proceed to step 2.
- If mass air flow rate 271.0 gm/second or more proceed to step 5.
2. Check voltage of Mass Air Flow Meter power source.
- Disconnect the Mass Air Flow Meter connector.
- Turn Ignition Switch ON.





- Measure voltage between terminal 1 of Mass Air Flow Meter connector and body ground.

Voltage: 9 - 14 volts

- If OK proceed to step 3.
- If not OK check for open in harness and connector between EFI Main Relay and Mass Air Flow Meter.
3. Check voltage between terminal VG of Engine Control Module and body ground.
- Remove glove compartment.
- Start the engine.





- Measure voltage between terminal VG of Engine Control Module and body ground while engine is idling. P position and A/C switch OFF.

Voltage: 1.1 to 1.5 volts

- If not OK proceed to step 4.
- If OK check and replace Engine Control Module.
4. Check for open and short in harness and connector between Mass Air Flow Meter and Engine Control Module.
- If OK replace Mass Air Flow Meter.
- If not OK repair or replace harness or connector.
5. Check continuity between terminal VG- of Engine Control Module and body ground.
- Remove glove compartment.





- Check continuity between terminal VG- of Engine Control Module and body ground.

Continuity: 1 ohm or less.

- If OK proceed to step 6.
- If not OK check and replace Engine Control Module.
6. Check for open in harness and connector between Mass Air Flow Meter and Engine Control Module.
- If OK replace Mass Air Flow Meter.
- If not OK repair or replace harness or connector.