Suzuki WagonR+ RB310 Service Manual page 654

Step
5 Check wire circuit.
1) Disconnect connectors from ECM with ignition
switch turned OFF.
2) Measure resistance between "WHT/GRN" wire ter-
minal of ECM connector and body ground and
between "GRY" wire terminal of ECM connector and
body ground.
Is resistance infinity?
6 Check wire circuit.
1) Turn ON ignition switch.
2) Check voltage between "WHT/GRN" wire terminal of
ECM connector and body ground and between
"GRY" wire terminal of ECM connector and body
ground.
Is voltage about 0 V at each terminal?
7 Check wire circuit.
1) Measure resistance between "E22-34" wire terminal
of ECM connector and "GRY" wire terminal of TP
sensor connector with ignition switch turned OFF.
Is resistance below 5
8 Check ground circuit.
1) Connect connectors to ECM.
2) Check for proper connection of MAP sensor connec-
tor at "BRN/WHT" wire terminal.
3) Measure resistance between "BRN/WHT" wire ter-
minal of MAP sensor connector and body ground.
Is resistance below 5
9 Check ground circuit.
1) Measure resistance between "E22-28" wire terminal
of ECM connector and body ground.
Is resistance below 5
10 Check TP sensor.
1) Turn OFF ignition switch.
2) Disconnect TP sensor connector.
3) Check for proper connection to TP sensor at each
terminal.
4) If OK, then measure resistance between TP sensor
terminals and check if each measured value is as
specified. See Fig. 2.
TP sensor resistance
Between 1 and 3: 4.0 – 6.0 k
Between 1 and 2: 0.1 – 6.5 k
throttle valve opening.
Are measured values as specified?
ENGINE GENERAL INFORMATION AND DIAGNOSIS (M13 ENGINE) 6-2-83
Action
Ω ?
Ω ?
Ω
?
Ω
Ω , varying according to
Yes
Go to Step 6.
Go to Step 7.
Go to Step 8.
Go to Step 10.
"BRN/WHT" wire open
circuit or high resistance
circuit.
Poor "E22-28" connec-
tion.
Go to Step 11.
No
"WHT/GRN" and/or
"GRY" wire shorted
to ground circuit.
If wire are OK, sub-
stitute a known-
good ECM and
recheck.
"WHT/GRN" and/or
"GRY" wire shorted
to power circuit.
If wire are OK, sub-
stitute a known-
good ECM and
recheck.
"GRY" wire in high
resistance circuit.
Go to Step 9.
Faulty ECM ground
circuit.
If circuit are OK,
substitute a known-
good ECM and
recheck.
Replace TP sensor.