Suzuki Grand Vitara XL-7 Service Manual page 159

6-1-20 ENGINE DIAGNOSIS (RHZ ENGINE WITH TRIPLE-CONNECTOR ECM)
TROUBLESHOOTING
STEP
1 Was "ENGINE DIAG. FLOW TABLE" performed?
2 Check Sensor Power Supply Circuit
1) Connect scan tool to DLC with ignition switch
OFF and then turn ignition switch ON.
2) Dose scan tool indicate DTC as shown below?
<Using Suzuki mode of Suzuki Scan tool>
P1614
<Using Generic Scan tool or Euro mode of Suzuki
Scan tool>
P0560
3 Check Wire Harness
1) Disconnect connector from fuel pressure sensor
with ignition switch OFF.
2) Check for proper connection to fuel pressure
sensor at each terminals.
3) If OK, then with ignition switch ON, check voltage
between "LT GRN/BLK" wire and "GRY" wire
terminals at connector of fuel pressure sensor.
Is voltage about 5 V?
4 Check Fuel Pressure Sensor Output Voltage
1) Remove ECM cover referring to "Voltage Check"
in this section.
2) Connect fuel pressure sensor connector.
3) Start engine and check voltage between E228-6
and E227-32 terminal at idle speed.
Is voltage about 1.3 V?
ACTION YES
Go to Step 2.
Go to DTC P1614
(P0560) Diag. Flow
Table.
Go to Step 4.
Substitute a known-
good ECM and
recheck.
NO
Go to "ENGINE DIAG.
FLOW TABLE".
Go to Step 3.
"LT GRN/BLK" wire
open, "LT GRN/BLK"
wire shorted to ground
circuit/power circuit,
"GRY" wire open, poor
E228-5 connection, or
poor E228-7
connection.
If wire and connection
are OK, substitute a
known-good ECM and
recheck.
"ORN /WHT" wire
open, "ORN/WHT"
wire shorted to ground
circuit/power circuit.
If wire and connection
are OK, substitute a
known-good fuel
pressure sensor and
recheck.