Clear DDEC codes.

TM 9-2320-364-34-1

2-8. TROUBLESHOOTING INSTRUCTIONS (CONT).

Select Mode 40 on the DDR.

Use arrow keys on the DDR to select YES.

Press ENTER.

NOTE

When ENTER has been pressed, the DDR will clear all stored codes and

check the DDEC ECM to ensure all codes are cleared. The DDR will

then display the results of the clearing function.

CODES NOT CLEARED

ENTER TO RETRY

FUNC TO EXIT

Data Readout Window

Press ENTER to retry the clearing function or FUNC to exit Mode 40.

(3)

Tools needed for DDEC diagnosis. The following tools and equipment are required to properly diagnose a

complete system:

(a)

Voltmeter and Ohmmeter: Use a digital volt-ohmmeter J-34029, or equivalent digital multimeter to

measure voltage and resistance when required. A digital multimeter must be used when specified in

the procedure.

(b)

Test Light 6V: Use when specified in the procedure.

(c)

Jumper Wires: Use to bypass a circuit and to insert between special connectors. This will permit

access to the connector terminals for circuit checking.

(d)

Diagnostic Data Reader (DDR) PRO LINK 9000: J38500-203.

(4)

Reading diagnostic codes. If you have turned to this instruction to begin diagnosis of a problem and

already know how to read, as well as understand Active and Historical codes, go to DDEC II

Troubleshooting (All Conditions) and begin DDEC Troubleshooting.

(5)

DDEC mode descriptions. Table 2-2 lists and describes each DDEC mode.

(6)

Flashing DDEC codes. DDEC troubleshooting procedures are designed to be performed with the DDR.

In situations where a DDR is not available, DDEC codes can be read by flashing them on the CEL. For

example, codes 13 and 23 will be flashed as follows:

(a)

Turn OFF ENGINE switch (TM 9-2320-364-10).

(b)

Place a jumper wire between wires 435 and 451 on DDL connector MC13, terminals A and M.

(c)

Turn ON ENGINE switch, observe the CEL and record the codes being flashed.

(d)

The CEL will flash once for the one in the number 13 and pause for about a half a second.

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