Suzuki 2007 XL7, Service Manual

Page: 263 / 3159

Engine General Information and Diagnosis: 1A-158
Circuit/System Testing
1. Ignition OFF, remove the fuse that supplies B+ to
terminal C2-56 of the ECM.
2. Disconnect the harness connector at the accelerator
pedal assembly.
3. Test for less than 5 ohms of resistance between the
appropriate low reference circuit of the APP sensor
and ground.
➢
If greater than 5 ohms, test the low reference circuit
of the APP sensor for a short to voltage, or an
open/high resistance. If the circuit/connections test
normal, replace the ECM.
4. Install the fuse that supplies B+ to terminal C2-56 of
the ECM.
NOTE
The 5-volt reference circuit voltage can be
within the specified range with a high
resistance in the circuit. If this condition is
suspected, refer to Diagnostic Aids.
5. Ignition ON, test for 4.8-5.2 volts between the
appropriate 5-volt reference circuit of the APP
sensor and ground.
➢ If less than the specified value, test the 5-volt
reference circuit for a short to ground or open/high
resistance. If the circuit/connections test normal,
replace the ECM.
➢
If greater than the specified value, test the 5-volt
reference circuit for a short to voltage. If the circuit/
connections test normal, replace the ECM.
6. Observe the appropriate APP sensor voltage
parameter with a scan tool. Verify the voltage is less
than 0.3 volt.
➢
If greater than the specified value, test the signal
circuit of the applicable APP sensor for a short to
voltage. If the circuit/connections test normal,
replace the ECM.
7. Install a 3A fused jumper wire between the
appropriate signal circuit and the 5-volt reference
circuit of the APP sensor. Verify the APP sensor
voltage parameter is greater than 4.8 volts.
➢
If less than the specified value, test the appropriate
signal circuit for a short to ground or an open/high
resistance. If the circuit/connections test normal,
replace the ECM.
➢
If both APP sensor voltage parameters display
greater than 4.8 volts test the signal circuits of the
APP sensors for a shorted together condition. If the
circuit/connections test normal, replace the ECM.
8. If all circuits/connections test normal, test or replace
the accelerator pedal assembly.
Component Testing
1. Install a 3A fused jumper wire between the 5-volt
reference terminal of the applicable APP sensor and
5 volts. Install a jumper wire between the applicable
low reference terminal and a ground.
2. Sweep the sensor through the entire range while
monitoring the voltage between the appropriate
signal circuit terminal and the low reference terminal
with a DMM. The voltage for APP 1 should vary
between 0.90-4.35 volts without any spikes or
dropouts. The voltage for APP 2 should vary
between 0.40-2.20 volts without any spikes or
dropouts.
➢ If the voltage is not within the specified range or is
erratic on either APP sensor, replace the
accelerator pedal assembly.
Repair Instructions
Perform the “Diagnostic Repair Verification - Vehicle
Diagnostic Information: ” after completing the diagnostic
procedure.
• “Accelerator Pedal Position Sensor Replacement: ”
• “Control Module References: ” for engine control
module replacement, setup, and programming
DTC P2176
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 P2176: Minimum Throttle Position Not Learned
Circuit/System Description
The engine control module (ECM) controls the throttle
valve by applying a varying voltage to the throttle
actuator control (TAC) motor. The ECM monitors the
actual throttle valve position using throttle position (TP)
sensor 1 and 2.
Conditions for Running the DTC
• The engine speed is less than 40 RPM.
• The vehicle speed is 0 km/h (0 mph).
• The engine coolant temperature (ECT) is between 5-
100
°
C (41-212
°
F).