GM Tech II Test Report Analysis

Tech 2 self tests verify that the Tech 2 scan tool is functioning normally. The self tests evaluate all critical areas of

the Tech 2 and display pass or fail messages for each subsystem tested. Self tests isolate user error from

system hardware failures. The self tests should be performed periodically to insure that the Tech 2 is

operating properly.

The Tech 2 must meet the following requirements in order to do a self test:

  • Screen display must be fully readable
  • Keypad must be operational

Begin the Tech 2 self-testing program by following these steps:

  1. Press [ENTER] while viewing the Tech 2 start-up screen (Figure VI-1).
  2. Select F3: Tool Options from the Tech 2 Main Menu (Figure VI-2).
  3. Select F3: Self Test from the Tool Options menu (

PCB DIAGNOSTIC CHART

Test Result Solution
RAM/ROM 0 – Pass

1 – ROM read fail

2 – RAM read fail

3 – RAM write and read do not compare.

Record type of failure.

Cycle Tech 2 power (press [PWR]) and retest.

If problem persists, contact Customer Support.

RS-485 loopback Pass

Fail – Loopback may not be connected.

Check loopback connection.

If problem persists, contact Customer Support.

RS-232 loopback Pass

Fail – Loopback may not be connected.

Check loopback connection.

If problem persists, contact Customer Support.

Keypad Test successful

Keypad failed

Exiting the test before all keys are pressed

results in a failed keypad test

Cycle Tech 2 power and retest.

If problem persists, contact Customer Support.

PCMCIA (Tests both card slots) Card detected

Card not present

Fail

Check that card is inserted properly.

Cycle Tech 2 power and retest.

If problem persists, contact Customer Support.

Display controller

(Contrast and characters)

User determines if display is correct If the display shows a noticeable failure during tests,

contact Customer Support

Sound transducer User determines if sound transducer is

working.

If no sound is emitted by repeatedly selecting Automated

Test or Sound On, contact Customer Support.

Real-time clock Time is displayed correctly. Invalid values are displayed for date, year, hour, minute, or second. Reset clock. Cycle Tech 2 power and retest. If time is not retained, contact Customer Support.

 

VCI MODULE DIAGNOSTIC CHART

Test Result Solution
MUX

(Multiplexer)

MUX A: S5 & S14

pass/fail

MUX B: S1 & S3

pass/fail

If MUX A or B fails, cycle Tech 2 power and retest.

If problem persists, contact Customer Support.

VCI adapter ID

(performed only during

selectable VCI test)

Recognized adapter

Cannot identify adapter

If adapter fails, use a different adapter to make sure that the VCI correctly identifies the adapters.

Cycle Tech 2 power and retest failed adapter. If adapter

fails second test, contact Customer Support.

VCI ADC

(Analog to digital converter)

Channel A – pass/fail

Channel B – pass/fail

If channel A or channel B fail, cycle Tech 2 and retest.

If problem persists, contact Customer Support.

Cross point Pull up – pass/fail

TPU5, TPU1, and TPU0 – pass/fail (results

from selectable VCI test)

If a failure occurs, cycle Tech 2 and retest.

If problem persists, contact Customer Support.

SIPO

(Serial In Parallel Out)

Pass/fail for each area tested  If a failure occurs, cycle Tech 2 and retest.

If problem persists, contact Customer Support.

DLC

(Data Link Connector)

DLC1 – DLC2

pass/fail count

DLC2 – DLC1

pass/fail count

If a failure occurs, cycle Tech 2 and retest.

If problem persists, contact Customer Support.

CCD

(Chrysler Collision Detection)

CCD – pass/fail

CCD – loopback not connected

Connect loopback and retest if loopback not connected.

If test fails, disregard results. Test is not for GM vehicles

(other than Saab) at this time.

GND FET

(Ground Field Effect

Transistor)

GND FET – pass/fail Check loopback adapter to make sure it is connected,

cycle Tech 2 retest.

If problem persists, contact Customer Support.

VCI HBCC

(Hosted Bus Control Chip)

HBCC – pass/fail  If HBCC chip fails, cycle Tech 2 and retest.

If problem persists, contact Customer Support.

VCI DUART

(Dual Universal Asynchronous

Receiver Transmitter)

Channel A – pass/fail

Channel B – pass/fail

If channel A or channel B fail, cycle Tech 2 and retest.

If problem persists, contact Customer Support.

VCI I/O 1 – I/O 16 Test Pass/fail messages will be displayed for

each of the I/O lines (results from selectable

VCI test).

If test fails, was loopback installed?

 

Once an error has been detected on one of the I/O

lines, you can test the specific line by selecting F3 or F4

tests. If the test fails continuously or intermittently,

contact Customer Support.

VCI loopback Pass/fail message for each I/O loopback test.  For any failure, make sure the loopback is connected.

Use F1: Check ID to verify that the loopback is found.

Cycle Tech 2 and retest. If problem persists, contact

Customer Support

VCI short L & M Open I/O 7 – pass/fail

Open I/O 9 – pass/fail

Hi I/O 7 – pass/fail

Hi I/O 9 – pass/fail

Lo I/O 7 – pass/fail

Lo I/O 9 – pass/fail

For any failure, cycle Tech 2 and retest.

If problem persists, contact Customer Support.

VCI J1708 Internal transceiver – pass/fail

Differential – pass/fail

Differential – pass/fail (results from

selectable VCI test)

For any failure, cycle Tech 2 and retest.

If problem persists, contact Customer Support.

VCI TPU

(Time Processor Unit)

TPU0 – pass/fail

TPU1 – pass/fail

TPU5 – pass/fail

TPU12 & TPU15 – pass/fail (or not tested if

no loopback)

TPU13 & TPU14 – pass/fail (or not tested if

no loopback)

For any failure, cycle Tech 2 and retest.

If problem persists, contact Customer Support.

VCI level shifters MUX A 2.5 V Hi – pass/fail

MUX A 2.5 V Lo – pass/fail

MUX A 5.0 V Hi – pass/fail

MUX A 5.0 V Lo – pass/fail (results from

selectable VCI test)

For any failure, cycle Tech 2 and retest.

If problem persists, contact Customer Support

POWER SOURCE: DLC CABLE

Step 1: Does vehicle support power through DLC cable connection

exclusively? (If you are not sure, consult your service manual.)

Yes: go to step 2

No: Use alternate power

Step 2: Using a digital multi-meter (DMM), verify vehicle battery voltage. Is battery fully charged?

Yes: go to step 3

No: Charge battery.

Step 3: Verify connection at vehicle DLC connector for loose or damaged

pin(s).

Did you find a problem?

Yes: Repair connector. (Consult vehicle service manual.)

No: go to step 4

Step 4: 1. Disconnect DLC cable from vehicle.

  1. Power on Tech 2 using alternate power source at DLC cable

power jack connection.

Did your Tech 2 power on?

Yes: Problem with vehicle. (Consult vehicle service manual.)

No: go to step 5

Step 5: Remove DLC cable from Tech 2 and attach alternate power supply at VCI power jack connection located at bottom of Tech 2. Does Tech 2 power on?

Yes: Replace DLC cable.

No: Problem with Tech 2. Contact Customer Support.

POWER SOURCE: CIGARETTE LIGHTER POWER CABLE

Step 1: 1. Unplug cigarette lighter power cable from DLC cable.

  1. Using a digital multi-meter (DMM), verify voltage output at

cigarette lighter power cable power jack.

Do you have battery voltage output?

Yes: go to step 2

No: go to step 3

Step 2: 1. Remove DLC cable from Tech 2.

  1. Plug in cigarette lighter power jack to the VCI power jack

connector located at bottom of Tech 2.

Does the Tech 2 power on?

Yes: Replace DLC cable.

No: Problem with Tech 2. Contact Customer Support.

Step 3: Using a DMM, verify voltage output at battery.

Do you have battery voltage output?

Yes: go to step 4

No: Charge battery.

Step 4: Disconnect cigarette lighter power cable from vehicle and verify

voltage output at vehicle cigarette lighter socket.

Do you have battery voltage output?

Yes: go to step 5

No: Problem with vehicle. Consult vehicle service manual.

Step 5: Check fuse in cigarette lighter power cable (refer to Figure VI-23).

Does fuse need replacing?

Yes: Replace fuse.

No: Replace cigarette lighter power cable.

POWER SOURCE: BATTERY POWER CABLE

Step 1: 1. Unplug battery power cable power jack from DLC cable.

  1. Using a digital multi-meter (DMM), verify voltage output at

battery power cable power jack.

Do you have battery voltage output?

Yes: go to step 2

No: go to step 3

Step 2: 1. Remove DLC cable from Tech 2.

  1. Plug in battery power cable power jack to the VCI power jack

connector located at bottom of Tech 2.

Does the Tech 2 power on?

Yes: Replace DLC cable

No: Problem with Tech 2. Contact Customer Support.

Step 3: Using a DMM, verify voltage output at battery.

Do you have battery voltage output?

Yes: go to step 4

No: Charge battery

Step 4: Check fuse(s) in battery power cable (refer to Figure VI-24).

Does fuse(s) need replacing?

Yes: Replace fuse(s).

No: Replace battery power cable.

POWER SOURCE: NAO OR UNIVERSAL POWER SUPPLY

Step 1: 1. Unplug NAO (or Universal) power supply jack from DLC cable.

  1. Using a digital multi-meter (DMM), verify voltage output at

power jack.

Do you have battery voltage output?

Yes: go to step 2

No: Replace NAO or Universal power supply

Step 2: 1. Remove DLC cable from Tech 2.

  1. Plug in NAO (or Universal) power supply power jack to the VCI

power jack connector located at bottom of Tech 2.

Does the Tech 2 power on?

Yes: Replace DLC cable

No: Problem with Tech 2.

Contact Customer

Support.

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