Without CONSULT-III
- Reconnect all harness connectors disconnected.
- Start engine and warm it up to normal operating temperature.
- Check voltage between ECM terminal 51 (Mass air flow sensor signal) and ground.VOLTAGE CONNECTOR TERMINALS REFERENCE CHART
Condition Voltage V Ignition switch ON (Engine stopped.) Approx. 0.4 Idle (Engine is warmed-up to normal operating temperature.) 1.0 - 1.3 2, 500 RPM (Engine is warmed-up to normal operating temperature.) 1.6 - 2.0 Idle to about 4, 000 RPM 1.0 - 1.3 to Approx. 2.4* *: Check for linear voltage rise in response to engine being increased to approximately 4, 000 RPM.
- If the voltage is out of specification, proceed the following.
- Check for the cause of uneven air flow through mass air flow sensor. Refer to the following.
- Crushed air ducts
- Malfunctioning seal of air cleaner element
- Uneven dirt of air cleaner element
- Improper specification of intake air system parts
- If NG, repair or replace malfunctioning part and perform steps 2 and 3 again.
If OK, go to next step.
- Check for the cause of uneven air flow through mass air flow sensor. Refer to the following.
- Turn ignition switch OFF.
- Disconnect mass air flow sensor harness connector and reconnect it again.
- Perform steps 2 and 3 again.
- If NG, clean or replace mass air flow sensor.