SsangYong Musso. Manual — part 116
1F-48 ENGINE CONTROLS
SSANGYONG Y158
Circuit Description
When the ignition switch is turned ON, the Engine Con-
trol Module (ECM) will activate the pump relay and run
the in-tank fuel pump. The fuel pump will operate as
long as the engine is cranking or running and the ECM
is receiving ignition reference pulses.
If there are no reference pulses, the ECM will shut off
the fuel pump within 1 second after the ignition switch
is turned ON, engine stopped or engine stalled.
Diagnostic Aids
An intermittent problem may be caused by a poor con-
nection, rubbed through wire insulation, or broken wire
inside the insulation.
FUEL PUMP RELAY CIRCUIT CHECK
Test Description
The number(s) below refer to specific step(s) on the
diagnostic table.
3. This step checks for the Engine Control Module
(ECM) providing ground for the operation of the fuel
pump relay.
7. By Confirming that the wiring is OK using steps 2
through 6, it can be determined that the fuel pump
relay is at fault.
9. After determining that there is no ground being pro-
vided by the ECM to the fuel pump relay, the fault is
either the ECM or the wiring between the ECM and
the fuel pump relay.
YAA1F39A
ENGINE CONTROLS 1F-49
SSANGYONG Y158
1
1. Turn the ignition OFF for 10 seconds.
2. Turn the ignition ON.
3. Listen for in-tank fuel pump operation.
Does the fuel pump operate for the time specified?
1. Turn the ignition OFF.
2. Disconnect the fuel pump relay.
3. Connect a test light between the fuel pump relay
connector terminal 86 and ground.
4. Turn the ignition ON.
Is the test light ON?
1. Turn the ignition OFF.
2. Connect a test light between the fuel pump relay
connector terminal 85 and battery positive.
3. Turn the ignition ON.
4. With the ignition ON, the test light should light for
the time specified.
Is the test light ON?
Turn the ignition OFF.
Connect a test light between the fuel pump relay
connector terminal 30 and ground.
Is the test light ON?
Check for an open or short to ground in the wire
between the fuel pump relay connector terminal 87 and
the fuel pump terminal 2.
Is the problem found?
1. Repair the wire between the fuel pump relay
connector terminal 87 and the fuel pump terminal 2.
2. Install the fuel pump relay.
3. Turn the ignition ON.
Does the fuel pump operates for the time specified?
1. Replace the fuel pump relay.
2. Turn the ignition ON.
Does the fuel pump operate for the time specified?
Check for an open wire between the fuel pump relay
connector terminal 86 and the Over Voltage Protection
Relay (OVPR) connector terminal 7.
Is the problem found?
Check for an open wire between the fuel pump relay
connector terminal 85 and the Engine Control Module
(ECM) connector terminal 33.
Is the problem found?
1. Repair the wire between the fuel pump relay connector
terminal 85 and the ECM connector terminal 33.
2. Install the fuel pump relay.
3. Turn the ignition OFF for 10 seconds.
4. Turn the ignition ON.
Does the fuel pump operate for the time specified?
Step
Action
Value(s)
Yes
No
Fuel Pump Relay Circuit Check
2
3
1 sec
System OK
Go to Step 2
1 sec
Go to Step 4
Go to Step 9
5
6
-
Go to Step 3
Go to Step 8
4
7
-
Go to Step 10
Go to Step 12
8
-
Go to Step 5
Go to Step 11
-
Go to Step 6
Go to Step 7
1 sec
System OK
-
1 sec
System OK
-
-
Go to Step 13
Go to “OVPR
Circuit Check”
9
1 sec
System OK
-
10
1F-50 ENGINE CONTROLS
SSANGYONG Y158
11
1. Repair the wire between the fuel pump relay
connector terminal 30 and battery.
2. Install the fuel pump relay.
3. Turn the ignition ON.
Does the fuel pump operate for the time specified?
1. Turn the ignition OFF.
2. Replace the ECM.
3. Turn the ignition ON.
Does the fuel pump operate for the time specified?
Repair the wire between the fuel pump relay connector
terminal 86 and the OVPR connector terminal 7.
Is the repair complete?
Step
Action
Value(s)
Yes
No
Fuel Pump Relay Circuit Check (Cont’d)
12
13
1 sec
System OK
-
1 sec
System OK
-
-
System OK
-
ENGINE CONTROLS 1F-51
SSANGYONG Y158
BLANK
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст