Suzuki XL7 2007 Service Manual page 241

Circuit/System Verification
1. Ignition ON, observe the DTC information with a
scan tool. Verify DTCs P0121, P0122, P0123,
P0221, P0222, or P0223 are not set.
➢ If any of the DTCs are set refer to "DTC P0121,
P0122, P0123, P0221, P0222, or P0223".
2. Verify that TP sensor 1 voltage is between 3.24-3.54
volts, and TP sensor 2 voltage is between 1.36-1.86
volts.
➢ If either TP sensor voltage is not within the
specified range refer to "DTC P0121, P0122,
P0123, P0221, P0222, or P0223".
3. Rapidly depress the accelerator pedal from the rest
position to the wide open throttle position (WOT) and
release the pedal. Repeat the procedure several
times. DTCs P0638, P2111, P2112, or P2119 should
not set.
➢ If any of the DTCs P0121, P0122, P0123, P0221,
P0222, or P0223 set while performing this
procedure refer to "DTC P0121, P0122, P0123,
P0221, P0222, or P0223".
4. Slowly depress the accelerator pedal to WOT and
then slowly return the pedal to closed throttle.
Repeat the procedure several times. DTCs P0638,
P2111, P2112, or P2119 should not set.
➢ If any of the DTCs P0121, P0122, P0123, P0221,
P0222, or P0223 set while performing this
procedure refer to "DTC P0121, P0122, P0123,
P0221, P0222, or P0223".
5. If the vehicle passes the Circuit/System Verification
Test, then operate the vehicle within the conditions
for running the DTC. You may also operate the
vehicle within the conditions that are captured in the
Freeze Frame/Failure Records Data List.
Circuit/System Testing
1. Inspect the throttle body for the following conditions:
– A throttle blade that is not in the rest position
– A throttle valve that is binding open or closed
– A throttle valve that opens or closes without spring
pressure
➢ If a condition is found, replace the throttle body.
NOTE
Disconnecting the throttle body harness
connector causes additional DTCs to set.
Engine General Information and Diagnosis:
2. Ignition OFF, disconnect the harness connector of
the throttle body. Ignition ON, test for 4.0-4.1 volts
between the TAC motor control 1 circuit terminal B
and ground.
➢ If voltage is greater than the specified range, test
each of the motor control circuits for a short to
voltage. If the circuits tests normal, replace the
ECM.
➢ If voltage is less than the specified range, test the
motor control 1 circuit for an open/high resistance.
Test each of the motor control circuits for a short to
ground. If the circuits tests normal, replace the
ECM.
3. Test for greater than 3.5 volts between TAC motor
control 1 circuit terminal B and TAC motor control 2
circuit terminal A.
➢ If the voltage is less than the specified value, test
the motor control 2 circuit for an open/high
resistance. If the circuit tests normal, replace the
ECM.
4. Ignition OFF, connect the J 34730-405 injector test
lamp between the TAC motor control 1 and TAC
motor control 2 circuits of the throttle body harness
connector. Observe the injector test lamp while
turning the ignition ON for 5 seconds and then OFF.
Verify the injector test lamp illuminates brightly.
➢ If the injector test lamp does not illuminate, replace
the ECM.
5. If all circuits test normal, replace the throttle body.
Repair Instructions
Perform the "Diagnostic Repair Verification - Vehicle
Diagnostic Information: " after completing the diagnostic
procedure.
• "Throttle Body Assembly Replacement: "
• "Control Module References: " for engine control
module replacement, setup, and programming
DTC P0642 or P0643
Diagnostic Instructions
• Perform the "Diagnostic System Check - Vehicle
Diagnostic Information: " prior to using this diagnostic
procedure.
• Review "Strategy Based Diagnosis: " for an overview
of the diagnostic approach.
• "Diagnostic Procedure Instructions - Vehicle
Diagnostic Information: " provides an overview of
each diagnostic category.
DTC Descriptors
DTC P0642: 5 Volt Reference 1 Circuit Low Voltage
DTC P0643: 5 Volt Reference 1 Circuit High Voltage
1A-136