ENGINE DIAGNOSIS (RHZ ENGINE WITH SINGLE-CONNECTOR ECM) 6-41
TROUBLESHOOTING
STEP ACTION YES NO
1 Was “ENGINE DIAG. FLOW TABLE” performed? Go to Step 2. Go to “ENGINE DIAG.
FLOW TABLE”.
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
Go to DTC P1614
(P0560) Diag. Flow
Table.
Go to Step 3.
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” wire and “GRY” wire terminals
at connector of fuel pressure sensor.
Is voltage about 5 V?
Go to Step 4. “LT GRN” wire open,
“LT GRN” wire shorted
to ground circuit/
power circuit, “GRY”
wire open, poor
C51-44 connection, or
poor C51-34
connection.
If wire and connection
are OK, substitute a
known-good ECM and
recheck.
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 C51-74
and C51-33 terminal at idle speed.
Is voltage about 1.3 V?
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.
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