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
- Press [ENTER] while viewing the Tech 2 start-up screen (Figure VI-1).
- Select F3: Tool Options from the Tech 2 Main Menu (Figure VI-2).
- 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.
- Power on Tech 2 using alternate power source at DLC cable
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.
- Using a digital multi-meter (DMM), verify voltage output at
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.
- Plug in cigarette lighter power jack to the VCI power jack
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.
- Using a digital multi-meter (DMM), verify voltage output at
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.
- Plug in battery power cable power jack to the VCI power jack
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.
- Using a digital multi-meter (DMM), verify voltage output at
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.
- Plug in NAO (or Universal) power supply power jack to the VCI
Does the Tech 2 power on?
Yes: Replace DLC cable
No: Problem with Tech 2.
Contact Customer
Support.
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