Suzuki XL7 2007 Service Manual page 283

• There may be fuel spray at the fuel injectors and the
indicated fuel pressure may be correct, yet there may
not be enough fuel to start the engine. If the fuel
injectors and the injector circuit are OK, and fuel spray
is detected, the fuel injector ON time may be
inadequate. If the engine control module (ECM)
receives incorrect inputs from the various information
sensors, the fuel delivered by the fuel injectors may
be inadequate to start the engine. Check all the
engine data parameters with a scan tool and compare
the values indicated with the expected values or the
values from a known good vehicle.
• Check the crankshaft position (CKP) sensor engine
reference signal with a scan tool. Observe the Engine
Speed parameter while cranking the engine. The scan
tool should indicate a steady 200-300 RPM while
cranking. If erratic values, such as sudden spikes in
the engine speed are displayed, the engine reference
signal is not stable enough for the engine to start and
run properly.
• Inspect the engine for good secure electrical grounds.
• If the engine almost starts and then stalls, check for
an open in the ground circuits of the CKP sensor and
the camshaft position (CMP) sensor.
• Water or foreign material in the fuel can cause a no
start or engine will not stay running condition. During
freezing weather water can freeze inside the fuel
system. The engine may start after 30 minutes in a
heated repair shop. The malfunction may not recur
until parked overnight in freezing temperatures.
Extreme weather conditions can cause contaminated
fuel to prevent the vehicle from starting.
• A vehicle that starts and runs after being brought to
the repair shop for a no start condition, may have an
ignition system that is susceptible to moisture. Spray
water on the ignition system components and the
wiring in order to check for an engine starting or will
not stay running concern.
Reference Information
Schematic Reference
"Engine Controls Schematics"
Connector End View Reference
• "Engine Control Module Connector End Views"
• "Engine Controls Connector End Views"
Electrical Information Reference
• "Circuit Testing: "
• "Connector Repairs: "
• "Testing for Intermittent Conditions and Poor
Connections: "
• "Wiring Repairs: "
Engine General Information and Diagnosis:
Scan Tool Reference
• "Scan Tool Data List - Engine Controls - 3.6L (LY7)"
• "Scan Tool Data Definitions - Engine Controls - 3.6L
(LY7)"
• "Scan Tool Output Controls - Engine Controls - 3.6L
(LY7)"
Special Tools Required
• J 34730-1A Fuel Pressure Gage
• J 26792 Spark Tester
Circuit/System Verification
NOTE
This diagnostic assumes the following:
• The battery is completely charged. Refer to
"Battery Inspection/Test: ".
• The engine cranking speed is acceptable.
Refer to "Engine Cranks Slowly: ".
• There is adequate fuel in the fuel tank.
1. Crank or start the engine. Observe the DTC
information with a scan tool. Verify that DTCs P0116,
P0118, P0119, P0201-P0206, P0335, P0336,
P0337, P0338, P0351-P0356, P0601, P0602,
P0604, P0606, P0627, P0628, P0629, P1629,
P1631, P1632, or P2105 do not set.
➢ If any of the listed DTCs are set, refer to
"Diagnostic Trouble Code (DTC) List - Vehicle
Diagnostic Information: ".
2. Ignition ON, observe the Theft Deterrent parameter
with a scan tool. The parameter should display
Disabled.
➢ If Enabled is displayed, refer to "Diagnostic Trouble
Code (DTC) List - Vehicle Diagnostic Information: ".
3. Test the ignition system for spark. Refer to
"Electronic Ignition (EI) System Diagnosis: ".
4. Ignition ON, command the fuel pump ON with a scan
tool. You should hear the fuel pump turn ON.
➢ If the fuel pump does not turn ON, refer to "Fuel
Pump Electrical Circuit Diagnosis: ".
5. Ignition OFF, install the J 34730-1A. Refer to "Fuel
Pressure Gage Installation and Removal: ".
NOTE
• The fuel pump may need to be commanded
ON a few times, in order to obtain the
highest possible fuel pressure.
• Do NOT start the engine for this test.
1A-178