{"id":3330,"date":"2019-03-22T07:29:29","date_gmt":"2019-03-22T07:29:29","guid":{"rendered":"http:\/\/www.obd2tool.com\/blog\/?p=3330"},"modified":"2025-08-23T07:33:52","modified_gmt":"2025-08-23T07:33:52","slug":"how-to-do-self-test-on-vci-keypad-candi-and-rs232-with-gm-tech2-scanner","status":"publish","type":"post","link":"https:\/\/www.obd2tool.com\/blog\/how-to-do-self-test-on-vci-keypad-candi-and-rs232-with-gm-tech2-scanner\/","title":{"rendered":"How to do self test on VCI , Keypad, CANdi and RS232 with GM Tech2 Scanner?"},"content":{"rendered":"

How to do GM Tech 2 scanner<\/a> self test step-by-step<\/b><\/strong>?<\/b><\/strong><\/p>\n

1.VCI self test<\/p>\n

2.Keypad self test<\/p>\n

3.CANdi<\/a> self test<\/p>\n

4.RS-232 self test<\/p>\n

 <\/p>\n

Follow the instruction in detail\u2026<\/p>\n

 <\/p>\n

Part 1: Tech2 VCI<\/a> self test<\/b><\/strong><\/p>\n

Insert the GM card<\/a><\/p>\n

\"1\"<\/a><\/p>\n

Connect the adapter and ready for the self test<\/p>\n

\"2\"<\/a><\/p>\n

Go to the main menu and select F4: Tool options<\/p>\n

\"3\"<\/a><\/p>\n

F3: Self test<\/p>\n

\"4\"<\/a><\/p>\n

Exit to continue<\/p>\n

\"5\"<\/a><\/p>\n

Select the function for self test<\/p>\n

\"6\"<\/a><\/p>\n

Here, press F2: Automated VCI<\/p>\n

\"7\"<\/a><\/p>\n

The VCI module self test result<\/p>\n

 <\/p>\n

Passed VCI selftest.<\/p>\n

\"8\"<\/a><\/p>\n

 <\/p>\n

 <\/p>\n

Part 2: GM Tech II<\/a> Keypad self test<\/b><\/strong><\/p>\n

Go to the Tech 2 menu and select F4: Tool options<\/p>\n

\"9\"<\/a><\/p>\n

Then F3: Self test<\/p>\n

\"10\"<\/a><\/p>\n

Before running the Tech 2 self test:<\/p>\n

(1) Candi cannot be connected<\/p>\n

(2) Aldl loopback should be connected (GM3000109)<\/p>\n

(3) Failure to follow these instructions may invalidate the self test<\/p>\n

\"11\"<\/a><\/p>\n

F3: Selectable main pcb<\/p>\n

\"12\"<\/a><\/p>\n

Press Keypad<\/p>\n

\"13\"<\/a><\/p>\n

And press key<\/p>\n

\"14\"<\/a><\/p>\n

Note: In the last image, the actual key pressed is F0 and the final result is PASS \u2013 that\u2019s normal<\/p>\n

 <\/p>\n

When you test the keypad, press F0-F1-F2-F3-F4-F5-F6-F7-F8-F9-EXIT-ENTER-in a good order! DO NOT SKIP ANY ONE.<\/p>\n

\"15\"<\/a><\/p>\n

 <\/p>\n

 <\/p>\n

Part 3: Tech 2 scan tool CANDI<\/a> module self test<\/b><\/strong><\/p>\n

VERY IMPORTANT: Pls make sure of the connection of the OBD adapter, OBD main cable, CANdi module, Tech 2 scan tool and the power supply \u2014 ALL should be good<\/b><\/strong><\/p>\n

\u00a0<\/b><\/strong><\/p>\n

The power should be connected by the OBD port for CANdi self test.<\/p>\n

\"16\"<\/a><\/p>\n

\"17\"<\/a><\/p>\n

\"18\"<\/a><\/p>\n

\"19\"<\/a><\/p>\n

F4: Tool options<\/p>\n

\"20\"<\/a><\/p>\n

F7: CANdi diagnostics<\/p>\n

\"21\"<\/a><\/p>\n

F0: POST result<\/p>\n

\"22\"<\/a><\/p>\n

Test status<\/p>\n

\"23\"<\/a><\/p>\n

F1: Self test<\/p>\n

\"24\"<\/a><\/p>\n

CANdi self test result<\/p>\n

\"25\"<\/a><\/p>\n

Pass selftest<\/p>\n

There are two test results for CANdi module.<\/p>\n

The one is Figure 8, and the other is Figure 10.<\/p>\n

 <\/p>\n

Part 4: GM Tech2 scanner RS232 self test<\/b><\/strong><\/p>\n

Check the connection before R232 self test<\/p>\n

\"26\"<\/a><\/p>\n

F4: Tool options<\/p>\n

\"27\"<\/a><\/p>\n

F3: Self test<\/p>\n

\"28\"<\/a><\/p>\n

 <\/p>\n

Exit to continue<\/p>\n

\"29\"<\/a><\/p>\n

F3: Selectable main PCB<\/p>\n

\"30\"<\/a><\/p>\n

F2: Rs-232 loopback<\/p>\n

\"31\"<\/a><\/p>\n

Rs232 test: Passed!<\/p>\n

\"32\"<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

How to do GM Tech 2 scanner self test step-by-step? 1.VCI self test 2.Keypad self test 3.CANdi self test 4.RS-232<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[27,7],"tags":[652,236,1064,237,53,1070,1279,80,1280,278,276,1065],"views":3002,"_links":{"self":[{"href":"https:\/\/www.obd2tool.com\/blog\/wp-json\/wp\/v2\/posts\/3330"}],"collection":[{"href":"https:\/\/www.obd2tool.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.obd2tool.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.obd2tool.com\/blog\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/www.obd2tool.com\/blog\/wp-json\/wp\/v2\/comments?post=3330"}],"version-history":[{"count":3,"href":"https:\/\/www.obd2tool.com\/blog\/wp-json\/wp\/v2\/posts\/3330\/revisions"}],"predecessor-version":[{"id":23170,"href":"https:\/\/www.obd2tool.com\/blog\/wp-json\/wp\/v2\/posts\/3330\/revisions\/23170"}],"wp:attachment":[{"href":"https:\/\/www.obd2tool.com\/blog\/wp-json\/wp\/v2\/media?parent=3330"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.obd2tool.com\/blog\/wp-json\/wp\/v2\/categories?post=3330"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.obd2tool.com\/blog\/wp-json\/wp\/v2\/tags?post=3330"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}