Check Mode Procedure

Total OBD & ECU Auto Diagnostics

TOAD Auto Diagnostics

Get Instant Access


Intelligent tester only:

Compared to normal mode, check mode is more sensitive to malfunctions. Therefore, check mode can detect the malfunctions that cannot be detected by normal mode. NOTICE:

All the stored DTCs and freeze frame data are erased if: 1) the ECM is changed from normal mode to check mode or vice versa; or 2) the ignition switch is turned from ON to ACC or OFF while in check mode. Before changing modes, always check and make a note of any DTCs and freeze frame data.

1. CHECK MODE PROCEDURE (Using an intelligent tester)

(a) Check and ensure the following conditions:

(1) Battery voltage 11 V or more

(2) Throttle valve fully closed

(3) Transmission in the P or N positions

(4) A/C switched OFF

(b) Turn the ignition switch OFF.

(c) Connect an intelligent tester to the DLC3.

(d) Turn the ignition switch ON.

(f) Select the following menu items: DIAGNOSIS / ENHANCED OBD II / CHECK MODE. Switch the ECM from normal mode to check mode.

Make sure the MIL flashes as shown in the illustration.

Start the engine.

Make sure the MIL turns off.

Simulate the conditions of the malfunction described by the customer.

Check DTCs and freeze frame data using the tester.

Was this article helpful?

0 0
Do It Yourself Car Diagnosis

Do It Yourself Car Diagnosis

Don't pay hundreds of dollars to find out what is wrong with your car. This book is dedicated to helping the do it yourself home and independent technician understand and use OBD-II technology to diagnose and repair their own vehicles.

Get My Free Ebook

Post a comment