G420E/G424E
Tier
LP Engine
Advanced Diagnostics
48
Table a. MI-04 Diagnostic Fault Codes (Flash Codes)
DFC
Probable Fault
Action
Corrective Action, First Check
12 NONE
Signifies the end of one pass through
the fault list
NONE
None, used as a beginning and end
of the fault list identification
14 ECTSensorInputLow
Coolant sensor failure or shorted to
GND
Stored Fault Code
(MIL Only)
Check ECT sensor connector and
wiring for a short to GND
SECM (SIGNAL) PIN 16 to
ECT PIN A
SECM (GND) PIN 1 to
ECT PIN B
15 ECTSensorInputHigh
Coolant sensor disconnected or open
circuit
Stored Fault Code
(MIL Only)
Check if ECT sensor connector is
disconnected or for an open ECT
circuit
SECM (SIGNAL) PIN 16 to
ECT PIN A
SECM (GND) PIN 1 to
ECT PIN B
16 ECTRangeHigh
Engine Overheating
Delayed Engine
Shutdown
Check coolant system for radiator
blockage, proper coolant level and for
leaks in the system. Possible ECT
short to GND, check ECT signal
wiring
SECM (SIGNAL) PIN 16 to
ECT PIN A
SECM (GND) PIN 1 to
ECT PIN B
z
Check regulator for coolant leaks
*See Chapter 7.0
22 ThrottleSensorInputLo
TPS1 signal disconnected or open
circuit
(Expected faults when ETC
connector is unplugged
CODES: 22 & 24)
Disable Throttle
Check throttle connector connection
and TPS1 sensor for an open circuit
ETC PIN 6 to SECM PIN 17
(SIGNAL)
ETC PIN 2 to SECM PIN 1 (GND)
