Yanmar 6LY3 series Service Manual page 363

Troubleshooting by DTC Fault Codes
12/05
P1240/0 (ECU Power Supply Voltage Open)
DTC P1240/0
ECU Connector Pin Configuration
Figure 13-38
1
11
21
31
No. 15 and 25: Power +12V (These are connected in parallel in ECU.)
No. 33 and 34: Ground (These are connected in parallel in ECU.)
DTC Fault Code
DTC / FMI 1. Condition, 2. Fault, 3. Time to Detect, 4. Display
1. Key switch ON
2. ECU diagnostic logic for ECU supply voltage open
P1240/0
3. Every second time the ignition is turned on
4. CHECK ENGINE on the TELEFLEX display
Fail Mode
Limited Operation
Fail Release
Remarks
Fault
DTC / FMI
P1240/0
Troubleshooting Procedure
Check the ECU power supply wire harness.
6LY3 Service Manual
ECU Power Supply Voltage Open
1 2 4 5
3
RA TARD TAAD AHR1 AHR2
11 12 13 14 15
G-P MNR RAR B1
STSW
21 22 23 24 25
CAMP B2
STR STHL SNS5
31 32 33 34 35
OUT1 OUT2 G_P1 G_P2 G_S
—
No limited operation
No
—
ECU power supply voltage open
© 2007 Yanmar Marine International
6 7
CRK- CAM-
16 17
CRK+ CAM+
26 27
CANL PLO
36 37
CANH THW
Figure 13-38
Probable Cause
TROUBLESHOOTING
9 10
8
10
IGN2
ST STHS
18 19 20
20
NTS IGN1 EMS
28 29
30
30
THF RPS
STH
40
38 39
40
AN1 THLO PBST
0006139
Check Point
Wire harness (battery - ECU)
13-73