Ecm Fuse - Isuzu C22NE Workshop Manual

F/Pump
Fuse
20A
M
Engine
Control
Module
(ECM)
DIAGNOSTIC TROUBLE CODE (DTC) (Flash DTC = 49)
Circuit Description
The engine control module (ECM) monitors the
system voltage on the ignition feed terminal to the
ECM. A system voltage Diagnostic Trouble Code will
set whenever the voltage is above a calibrated value.
This malfunction detects an over-voltage condition in
the battery voltage circuit.
Conditions for Setting the DTC
• Engine is running.
• Battery Voltage is greater than 17.2V.
ECM
Fuse
15A
Relay
Fuel
Pump
0.5 1.25
G/W BLK
A13 E3
SYSTEM VOLTAGE HIGH
DRIVEABILITY AND EMISSIONS 6E1-181
HOT AT ALL TIMES
Ignition
I/P
Coil
FUSE
Fuse
BLOCK
15A
2
W/G
Ignition
Coil
1,4 2,3
1.25 1.25 1.25
G BLK L
E1 E2 E4
Ignition Feeds
Action Taken When the DTC Sets
• The ECM will illuminate the malfunction indicator
lamp (MIL) for the first time the malfunction is
detected.
Conditions for Clearing the MIL/DTC
Once the ECM determines that a fault(s) has been
rectified then the CEL will switch OFF, although the
fault code will remain in the ECM memory.
Any fault codes will remain in ECM memory until -
1. They are cleared by disconnecting the Battery for
more than 30 seconds.
2. A service tool such as Tech 2 is used to clear them.
3. Ten consecutive starts without logging a fault.
Diagnostic Aids
• Check for a faulty charging system components.
HOT AT ALL TIMES
ECM U/H
Fuse FUSE
15A BLOCK
1.25 1.25
RED/ RED/
WHT WHT
A4 A5
Batt+