DSM.0008 Ver 1.0
FCCC MT-45 / MT 55 CNG Diagnostics Service Manual
February 15, 2022
P
RINTED AND
D
OWNLOADED
C
OPIES ARE
N
OT
C
ONTROLLED
FCCC MT CNG
42
FCCC MT CNG
DSM.0008 Ver 1.0
FCCC MT-45 / MT 55 CNG Diagnostics Service Manual
February 24, 2022
P
RINTED AND
D
OWNLOADED
C
OPIES ARE
N
OT
C
ONTROLLED
42
Crank, No-Start
Step 7
Disconnect
Y41 supply solenoid valve
connector.
Using a DMM, check for battery voltage across the
Y41
connector
Terminals 1
(Pink) and
2
(Black).
Battery voltage present;
Replace pressure regulator.
Battery voltage not present:
Proceed to Step 8.
Step 8
Check for battery voltage from
Y41
connector
Terminal 1
(Pink) to
known good ground.
Battery voltage to ground present:
Repair open or high resistance in circuit
105 between Y41 and G21. Refer to
DSM.0036.
Perform System Verification Procedure.
Battery voltage not present:
Repair open or high resistance in circuit 204
between Y41 and Splice S3/S4. Refer to
DSM.0036.
Perform System Verification Procedure.
Y41
Always follow OEM fuel system
depressurization and repair
instructions.
DMM
V
known good
ground
DMM
V
1
2
1
2