Connecting HHT or Impulse Counter Scan Tool [0.3]

Connecting Hand-Held Tester or Impulse Counter Soon Tool, Reading and Erasing Diagnostic Trouble Code Memory

Note:
- Observe all system specific instructions listed in the "Preparation for Test" section of each Test Program.
- Diagnostic trouble codes (DTC's) which have been stored due to testing or the disconnection of lines must be erased from the diagnostic trouble code memory at the end of testing.

Connect Hand-Held Tester (HHT) according to connection diagram:
The following functions can be perrormed according to the instructions on the display:
a) Reading/erasing DTC memory
b) Reading actual values
c) Performing activations
d) Programming control modules

Special Tools:

Connect Impulse Counter Scan Tool (according to connection diagram).
LED "U-Batt" must light up in the display.
If LED does not light up, check:
a) voltage supply.
b) Impulse counter scan tool fuse.

Note: DTC readout is no longer possible using the impulse counter scan tool, with some systems, please review section [12] in each system section prior to starting the DTC readout for the system being checked.


1. Read Diagnostic Trouble Code Memory
a) Ignition ON
b) Press start button for 2 to 4 seconds.
c) Read end record diagnostic trouble code (DTC).
d) Press start button again for 2 to 4 seconds.
e) Read and record DTC.
Repeat steps d) and e) until the first DTC reappears.

2. Clear Diagnostic Trouble Code Memory 1)
a) Press start bufton for 2 to 4 seconds (DTC appears)
b) Wait 3 seconds then press start bufton for 6 to 8 seconds thereby erasing the previously displayed DTC from memory.
c) Each stored DTC must be erased individually.

1) Erasing ofsdored diagnostic trouble codes must begin within 20 seconds of reading the DTC. After 20 seconds, the DTC can no longer be erased. Erasing procedure can be redaded by performing DTC memory readout alter the fault is again displayed.