G420E/G424E Tier LP Engine Advanced Diagnostics 54
Table a. MI-04 Diagnostic Fault Codes (Flash Codes)
DFC Probable Fault Action Corrective Action, First Check
43
EST1High
Coil driver signal high or over-current
Stored Fault Code
(MIL Only)
Check coil driver wiring for an open
circuit or disconnected connector
SECM PIN 7(EST1) to COIL PIN A
Verify GND on COIL PIN B
Verify GND on COIL PIN C
Verify GND on COIL PIN D
Verify +12vdc on COIL PIN E
To check the Smart Coil internal
circuit disconnect the coil connector
and measure the resistance from pin
to pin
*See Smart Coil resistance check
in Chapter 6.0
53 BatterySensorInputLow
Battery voltage measured below
+8.0 VDC
Stored Fault Code
(MIL Only)
Check battery voltage
z Perform maintenance check on
electrical connections to the
battery and chassis ground
z Check battery voltage during
starting and with the engine
running to verify charging system
and alternator function
Measure battery power at the SECM
with a multimeter
SECM PIN 13 (BATT +) to SECM
PIN 14 (BATT -)
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