CUMMINS QST30 - Page 59

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4-25

TABLE 4-15. LOW ENGINE TEMPERATURE WARNING (210)

WARNING

Many troubleshooting procedures present hazards that can result in severe personal inju-

ry or death. Only qualified service personnel with knowledge of fuels, electricity, and machinery haz-

ards should perform service procedures. Review Important Safety Instructions page.

“LOW

COOLANT

TEMP”

warning

(210)

message.

Coolant level

is normal.

Heater is OK.

Coolant temp

on front panel

display is OK.

DS3 on the

engine

interface

board, A31,

is on.

Indicator(s) Possible Cause Corrective Action

DS3 / A31 is on, indicating that engine in-

terface board A31 is receiving a low cool-

ant temp from the sender.

The sender, the harness or A31 could be

bad.

Isolate the source of the signal.

Unplug the coolant temperature switch (S1) and re-

set the control.

1. If the 210 warning message drops out and does

not reappear, replace the sender.

*2. If the 210 warning message reappears and re-

mains after control reset, disconnect A31 J4

and check continuity from P4−13 to GND.

 If there is continuity, replace the harness.

 If there is no continuity, replace circuit

board A31.

DS3 / A31 is off, indicating that engine in-

terface board A31 is not receiving a low en-

gine temp signal from the sender—but the

210 message indicates that A32, the digital

board, is responding to a false low engine

temp signal.

A31, the engine interface board, or A32,

the digital board, could be bad.

Isolate the source of the signal.

Check J4−6/P4−6 on A32.

*1. Install harness tool between A32 J4/P4.

2. Open J4−6 and reset the control.

 If fault drops out and does not return, re-

place A31.

 If fault returns after resetting the control,

replace A32.