DTC Confirmation Procedure

Perform "PROCEDURE FOR MALFUNCTION A" first. If the 1st trip DTC cannot be confirmed, perform "PROCEDURE FOR MALFUNCTION B". If there is no problem on "PROCEDURE FOR MALFUNCTION B", perform "PROCEDURE FOR MALFUNCTION C". If there is no problem on "PROCEDURE FOR MALFUNCTION C", perform "PROCEDURE FOR MALFUNCTION D".

NOTE:
If "DTC Confirmation Procedure" has been previously conducted, always turn ignition switch "OFF" and wait at least 5 seconds before conducting the next test.





PROCEDURE FOR MALFUNCTION A

With CONSULT
(1) Turn ignition switch "ON".
(2) Select "DATA MONITOR" mode with CONSULT.
(3) Wait at least 6 seconds.

With GST
(1) Turn ignition switch "ON" and wait at least 6 seconds.
(2) Select "MODE 7" with GST.

No Tools
(1) Turn ignition switch "ON" and wait at least 6 seconds.
(2) Turn ignition switch "OFF", wait at least 5 seconds and then turn "ON".
(3) Perform "Diagnostic Test Mode II (Self-diagnostic results)" with ECM.





PROCEDURE FOR MALFUNCTION B

With CONSULT
(1) Turn ignition switch "ON".
(2) Select "DATA MONITOR" mode with CONSULT.
(3) Start engine and wait 5 seconds at most.

With GST
(1) Start engine and wait 5 seconds at most.
(2) Select "MODE 7" with GST.

No Tools
(1) Start engine and wait 5 seconds at most.
(2) Turn ignition switch "OFF", wait at least 5 seconds and then turn "ON".
(3) Perform "Diagnostic Test Mode II (Self-diagnostic results)" with ECM.

NOTE:
If 1st trip DTC is confirmed after more than 5 seconds, there may be a malfunction.





PROCEDURE FOR MALFUNCTION C

With CONSULT
(1) Turn ignition switch "ON".
(2) Select "DATA MONITOR" mode with CONSULT.
(3) Start engine and warm it up to normal operating temperature.
(4) Run engine for at least 10 seconds at idle speed.

With GST
(1) Start engine and warm it up to normal operating temperature.
(2) Run engine for at least 10 seconds at idle speed.
(3) Select "MODE 7" with GST.

No Tools
(1) Start engine and warm it up to normal operating temperature.
(2) Run engine for at least 10 seconds at idle speed.
(3) Turn ignition switch "OFF", wait at least 5 seconds and then turn "ON".
(4) Perform "Diagnostic Test Mode II (Self-diagnostic results)" with ECM.





PROCEDURE FOR MALFUNCTION D

CAUTION: Always drive vehicle at a safe speed.

With CONSULT
(1) Turn ignition switch "ON".
(2) Start engine and warm it up to normal operating temperature. If engine cannot be started, go to "Diagnostic Procedure".
(3) Select "DATA MONITOR" mode with CONSULT.
(4) Check the voltage of MAS AIR/FL SE with "DATA MONITOR".
(5) Increases engine speed to about 4,000 rpm.
(6) Monitor the linear voltage rise in response to engine speed increases.
If NG, go to "Diagnostic Procedure". If OK, go to following step.
(7) Maintain the following conditions for at least 10 consecutive seconds.
CMPS.RPM (REF): More than 2,000 rpm
THRTL POS SEN: More than 3 V
Selector lever: Suitable position
Driving location:
Driving vehicle uphill (Increased engine load) will help maintain the driving conditions required for this test.











Overall Function Check
Use this procedure to check the overall function of the mass air flow sensor circuit. During this check, a 1st trip DTC might not be confirmed.

With GST
(1) Start engine and warm it up to normal operating temperature.
(2) Select "MODE 1" with GST.
(3) Check the mass air flow sensor signal with "MODE 1".
(4) Check for linear mass air flow sensor signal value rise in response to increases to about 4,000 rpm in engine speed.

No Tools
(1) Start engine and warm it up to normal operating temperature.
92) Check the voltage between ECM terminal 54 (Mass air flow sensor signal) and ground.
(3) Check for linear voltage rise in response to increases to about 4,000 rpm in engine speed.