Suzuki WagonR+ RB310 Service Manual page 653

6-2-82 ENGINE GENERAL INFORMATION AND DIAGNOSIS (M13 ENGINE)
1) With ignition switch turned OFF, connect scan tool.
2) Turn ON ignition switch and clear DTC using scan tool.
3) Start engine and warm up to normal operating temperature.
4) Drive vehicle at 60 km/h (38 mile/h) at 5th gear or D range.
5) Increase vehicle speed to 65 km/h (40 mile/h) at 5th gear or D range.
6) Release accelerator pedal to decrease vehicle speed till 60 km/h (38 mile/h).
7) Repeat Step 4) to 6) for 3 times.
8) Stop vehicle and check DTC and pending DTC.
Troubleshooting
Step
1 Was "Engine and Emission Control System Check" per-
formed?
2 Check TP sensor and its circuit.
1) Turn OFF ignition switch and connect SUZUKI scan
tool to DLC.
2) Turn ON ignition switch and check TP sensor output
voltage when throttle valve is at idle position and fully
opened. See Fig. 1.
Does voltage vary within specified value linearly as
shown in figure?
3 Check TP sensor voltage.
1) Disconnect connector from TP sensor with ignition
switch turned OFF.
2) Check for proper connection to TP sensor connector
at "WHT/GRN", "GRY" and "BRN/WHT" wire termi-
nals.
3) If OK, then with ignition switch turned ON, check for
the following terminal voltages.
• Between "WHT/GRN" terminal of TP sensor connec-
tor and body ground
• Between "GRY" terminal of TP sensor connector and
body ground
Is each terminal voltage about 4 – 6 V?
4 Check ECM voltage.
1) Turn ignition switch to OFF position.
2) Check for proper connection of ECM connector at
"E22-8" and "E22-34" wire terminals.
3) If OK, disconnect connector from MAP sensor.
4) Turn ignition switch to ON position.
5) Check for the following terminal voltages.
• Between "E22-8" terminal of ECM connector and
body ground
• Between "E22-34" terminal of ECM connector and
body ground
Is each terminal voltage about 4 – 6 V?
Action Yes
Go to Step 2.
Go to Step 11.
Go to Step 7.
"GRY/RED" wire open
or high resistance cir-
cuit.
Faulty MAP sensor,
check MAP sensor
according to "MAP Sen-
sor Individual Check"
under "DTC P0108
Manifold Absolute Pres-
sure High Input" in this
section.
If they are OK, go to
Step 5.
No
Go to "Engine and
Emission Control
System Check" in
this section.
Go to Step 3.
Go to Step 4.
Go to Step 5.