With TECH 2
WARNING: TO AVOID DEPLOYMENT WHEN TROUBLESHOOTING THE SRS, DO NOT USE ELECTRICAL TEST EQUIPMENT SUCH AS A BATTERY-POWERED OR AC-POWERED VOLTMETER, OHMMETER, ETC., OR ANY TYPE OF ELECTRICAL EQUIPMENT OTHER THAN THAT SPECIFIED IN THIS MANUAL. DO NOT USE A NON-POWERED PROVE-TYPE TESTER. INSTRUCTIONS IN THIS MANUAL MUST BE FOLLOWED CAREFULLY OTHERWISE PERSONAL INJURY MAY RESULT.Diagnostic Trouble Codes
The "SRS Diagnostic System Check" must always be the starting point of any SRS diagnosis. The "SRS Diagnostic System Check" checks for proper "AIR BAG" warning lamp operation and checks for SRS diagnostic trouble codes using the scan tool.
1. Current diagnostic trouble codes - Malfunctions that are presently being detected. Current diagnostic trouble codes are stored in RAM (Random Access Memory).
2. History diagnostic trouble codes - All malfunctions detected since the last time the history memory was cleared. History diagnostic trouble codes are stored in EEPROM.
Scan Tool Diagnostics
A scan tool is used to read current and history diagnostic trouble codes and to clear all diagnostic trouble codes after a repair is completed. The scan tool must be updated to communicate with the SRS through a replaceable cartridge before it can be used for SRS diagnostics. To use the scan tool, connect it to the data link connector and turn the ignition switch "ON". The scan tool reads serial data from the SDM "Serial Data" line terminal "24" to the data link connector terminal "9".
Use of Special Tools
WARNING: TO AVOID DEPLOYMENT WHEN TROUBLESHOOTING THE SRS, DO NOT USE ELECTRICAL TEST EQUIPMENT SUCH AS A BATTERY-POWERED OR AC-POWERED VOLTMETER, OHMMETER, ETC, OR ANY TYPE OF ELECTRICAL EQUIPMENT OTHER THAN THAT SPECIFIED IN THIS MANUAL. DO NOT USE A NON POWERED PROVE-TYPE TESTER.INSTRUCTIONS IN THIS MANUAL MUST BE FOLLOWED CAREFULLY, OTHERWISE PERSONAL INJURY MAY RESULT. YOU SHOULD BE FAMILIAR WITH THE TOOLS LISTED IN THIS SECTION UNDER THE HANDLING SRS SPECIAL TOOLS.
You should be able to measure voltage and resistance. You should be familiar with proper use of a scan tool such as the Tech 2 Diagnostic Computer, SRS Driver/Passenger Load Tool J41433, Connector Test Adapter Kit J-35616-A, and the DVM (Digital Multimeter) J-39200.
Tech 2 Scan Tool:
Getting Started
- Before operating the Isuzu PCMCIA card with the Tech 2 the following steps must be performed;
1. The Isuzu 2001 MY System PCMCIA card (1) inserts into the Tech 2 (5).
2. Connect the SAE 16/19 adapter (3) to the DLC cable (4).
3. Connect the DLC cable to the Tech 2 (5)
4. Mark sure the vehicle ignition is off.
5. Connect the Tech 2 SAE 16/19 adapter to the vehicle Data Link Connector (DLC).
6. The vehicle ignition turns on.
7. Verity the Tech 2 power up display.
NOTE: The RS232 loop back connector is only to use for diagnosis of Tech 2 and refer to user guide of the Tech 2.
Operating Procedure
The power up screen is displayed when you power up the tester with the Isuzu Systems PCMCIA card. Follow the operating procedure
Menu
- The following table shows which functions are used for the available equipment versions.
DTC Modes
- Read DTC into by Priority
- Clear Into
Data Display
Plotting Snapshot Graph
This test selects several necessary items from the data list to plot graphs and makes data comparison on a long term basis It is an effective test particularly in emission related evaluations.
For trouble diagnosis, you can collect graphic data (snap shot) directly from the vehicle.
You can replay the snapshot data as needed. Therefore, accurate diagnosis is possible, even though the vehicle is not available.
Plotting Graph Flow Chart (Plotting graph after obtaining vehicle information):
Plotting Graph Flow Chart (Plotting graph after obtaining vehicle information).
Flow Chart for Snapshot Replay (Plotting Graph):
Flow Chart for Snapshot Replay (Plotting Graph).