Reading DTCs Using A Tech 1 or Other Scan Tool

The procedure for reading diagnostic trouble code(s) is to used a diagnostic Scan Tool. When reading DTC(s), follow instructions supplied by tool manufacturer.

Clearing Diagnostic Trouble Codes

IMPORTANT: Do not clear DTCs unless directed to do so by the service information provided for each diagnostic procedure. When DTCs are cleared, the Freeze Frame and Failure Record data which may help diagnose an intermittent fault will also be erased from memory.

If the fault that caused the DTC to be stored into memory has been corrected, the Diagnostic Executive will begin to count the "warm-up" cycles with no further faults detected, the DTC will automatically be cleared from the PCM memory.

To clear Diagnostic Trouble Codes (DTCs), use the diagnostic Scan Tool "clear DTCs" or "clear information" function. When clearing DTCs follow instructions supplied by the tool manufacturer.

When a Scan Tool is not available, DTCs can also be cleared by disconnecting one of the following sources for at least thirty (30) seconds.

CAUTION: To prevent system damage, the ignition key must be "OFF" when disconnecting or reconnecting battery power.
- The power source to the control module. Examples: fuse, pigtail at battery PCM connectors etc.
- The negative battery cable. (Disconnecting the negative battery cable will result in the loss of other on-board memory data, such as preset radio tuning).

Tech 1 Scan Tool
For the 1996 model year, Isuzu dealer service departments will continue to use the Tech 1 or Tech 1A Scan Tool. The following Vehicle Interface Module (VIM) components are also required to communicate between the Tech 1/Tech 1A and the 1996 Class II Serial Data line.




Tech 1
1. Mass Storage Cartridge
2. Tech I
3. Tech 1 RWAL/4WAL DLC Cable
4. Cigarette Lighter Power Cable
5. Tech 1 14/12 PIN VIM DLC Adapter
6. Vehicle Interface Module (VIM)
7. 16/24 Pin VIM DLC Adapter Cable




Tech 1 (Series A)
1. Mass Storage Cartridge or Individual Application Cartridge
2. Tech 1 (Series A)
3. Tech 1 (Series A) 14/26 Pin DLC Cable
4. Vehicle Interface Module (VIM)
5. 16/24 Pin VIM DLC Adapter Cable
6. RS-232 Port (Series A only, "Tech 1A")