1-SECM-01n

1-SECM-01n
DDEC® III/IV SINGLE ECM TROUBLESHOOTING GUIDE
73.1 DESCRIPTION OF FLASH CODE 73
Flash Code 73 is used for many faults.
3
When used with the Engine Synchronous Shift (ESS) system on diesel fuel engines,
this code indicates a fault was detected by the ECM, see Figure 73-1, of the input from
the shift knob or Neutral Switch. It also indicates the limits for the maximum air inlet
restriction have been exceeded.
When used in a gas-fueled engine, the code indicates a gas valve position fault.
3
73.2 SAE J1587 EQUIVALENT CODE FOR FLASH CODE 73
The SAE J1587 equivalent code for Flash Code 73, diesel engines, are listed in Table 73-1.
Flash
SAE Codes
Description
73
s 107–0
Air filter restriction high
73
s 227-2
Shift knob data erratic, intermittent or incorrect
73
s 227-3
Shift knob voltage above normal or shorted high
73
s 227-4
Shift knob voltage below normal or shorted low
73
s 226-11
Neutral / in-gear switch fault
73
s 151-14
Stuck in gear detected
Table 73-1
Flash Code 73 Equivalent Codes for Diesel Engines
The SAE J1587 equivalent code for Flash Code 73, gas engines, are listed in Table 73-2.
Flash
SID
FMI
Gas Valve Position
73
A## SID:77
FMI:0
Above normal range
73
A## SID:77
FMI:1
Below normal range
73
A## SID:77
FMI:3
Input voltage high
73
A## SID:77
FMI:4
Input voltage low
Table 73-2
Flash Code 73 Equivalent Codes for Gas Engines
All information subject to change without notice.
(Rev. 3/01)
6SE497 0006 Copyright © 2001 DETROIT DIESEL CORPORATION
From Bulletin 1–SECM-01 Rev.
73-3
73.3
TROUBLESHOOTING FLASH CODE 73
73.3 TROUBLESHOOTING FLASH CODE 73
The following procedure will troubleshoot Flash Code 73. For troubleshooting diesel engines,
refer to section 73.3.1. For troubleshooting gas engines, refer to section 73.3.3.
73.3.1
Determine the SAE Code
Perform the following steps to determine the SAE code.
1. Plug in DDR.
2. Turn ignition ON.
3. Record logged codes.
[a] If codes 226–11 or 151–14 are logged, refer to section 73.3.3.
[b]
If code 227 is logged, and codes 226–11 or 151–14 are not logged,
refer to section 73.3.6.
[c] If code 107/0 is logged, refer to section 73.3.2.
73.3.2
Air Filter Restriction High
Perform the following steps to determine if the limits for the maximum air inlet restriction have
been exceeded:
1. Turn ignition ON.
2. Plug in DT (diagnostic tool).
3. Read ECM software level under the engine configuration.
[a] If the ECM software is less than 29.00, reprogram the ECM.
[b]
73.3.3
If the ECM software is 29.00 or higher, service the air inlet system—typically,
change the air filter.
Check Switch Light Status
Perform the following steps to check the switch light status. See Figure 73-2.
1. Turn ignition ON.
2. Plug in DDR.
3. Select SWITCH LIGHT STATUS.
4. Move the transmission shift lever to neutral; then place in gear.
[a] If the switch light status changes when the transmission is in gear vs neutral
(in neutral Status=ON), and if DDR BREAK TORQUE, SYSTEM SW and
SHIFT INTENT status change (ON/OFF) when switch positions are changed, the
problem no longer exists. Perform a road test and return to service. This may still be
an intermittent issue.
(Rev. 3/01)
73-4
From Bulletin 1–SECM-01 Rev.
All information subject to change without notice.
6SE497 0006 Copyright © 2001 DETROIT DIESEL CORPORATION
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