Suzuki XL7 2007 Service Manual page 1526

5A-116 Automatic Transmission:
DTC P0115, P0120, P0703, P0727, P0826,
P1779, P2544, or P2637
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 Descriptor
DTC P0115: Engine Coolant Temperature (ECT)
Sensor Circuit
DTC P0120: Throttle Position (TP) Sensor Circuit
DTC P0703: Brake Switch Circuit
DTC P0727: Engine Speed - No Signal
DTC P0826: Up and Down Shift Switch Circuit
DTC P1779: Torque Delivered Signal
DTC P2544: Transmission Torque Request Circuit
DTC P2637: Transmission Torque Delivered Circuit
Circuit/System Description
The controller area network (CAN) serial data bus is
used by the engine control module (ECM) and automatic
transmission control module (TCM) to share information.
This diagnostic applies to Controller Area Network
(CAN) signal failures.
Conditions for Running the DTC
• No Lost Communications with the ECM, DTC U0100.
• The ignition in ON for at least 3 seconds.
• Not in Emergency Mode.
Conditions for Setting the DTC
DTC P0115
The TCM detects that the engine coolant temperature
signal from the ECM is invalid.
DTC P0120
The TCM detects that the accelerator position signal
from the ECM is invalid.
DTC P0703
The TCM detects that the brake pedal signal from the
ECM is invalid.
DTC P0727
The TCM detects that the engine speed signal from the
ECM is invalid.
DTC P0826
The TCM detects that the Tap Up/Down mode request or
switch status signal from the ECM is invalid.
DTC P1779
The TCM detects that the engine air flow torque steady
state signal from the ECM is invalid.
DTC P2544
The TCM detects that ECM fails to deliver torque control.
DTC P2637
The TCM detects that the engine torque signal from the
ECM is invalid.
Action Taken When the DTC Sets
DTC P0115
• DTC P0115 is a Type C DTC.
• The transmission will default the engine coolant
temperature to 80°C (176°F).
DTC P0120
• DTC P0120 is a Type A DTC.
• The TCM will default Accelerator Position data to 0
percent.
• The transmission will operate in 5th gear in D range,
2nd gear in L range.
DTC P0703
• DTC P0703 is a Type C DTC.
• The TCM will default the brake pedal signal to off.
DTC P0727
• DTC P0727 is a Type A DTC.
• The TCM will default engine speed data to 6000 RPM.
• The TCM will limit engine torque to 270 N⋅m (199 lb
ft).
• The transmission will operate in 5th gear in D range,
2nd gear in L range.
DTC P0826
• DTC P0826 is a Type C DTC.
• The transmission will disable or inhibit Tap Up/Down
mode.
DTC P1779
• DTC P1779 is a Type C DTC.
• The TCM will default driver requested torque data to
300 N⋅m (221 lb ft).
DTC P2544
• DTC P2544 is a Type C DTC.
• The TCM will increase transmission oil pressure to
maximum.
• The TCM will limit the maximum shift speed to 4000
RPM.
DTC P2637
• DTC P2637 is a Type A DTC.
• The TCM will default engine torque data to 300 N⋅m
(221 lb ft).
• The TCM will limit engine torque to 270 N⋅m (199 lb
ft).
• The transmission will operate in 5th gear in D range,
2nd gear in L range.