Suzuki Grand Vitara Service Manual page 204

1A-197 Engine General Information and Diagnosis:
Step
6 Wire harness check
1) Disconnect connectors from ECM with ignition switch
turned OFF.
2) Measure resistance between "E23-56" terminal of ECM
connector and engine ground.
Is resistance infinity?
7 Wire harness check
1) Disconnect connectors from ECM with ignition switch
turned OFF.
2) Check for proper connection of ECM connector at "E23-
55", "E23-54" and "E23-51" terminals.
3) If OK, measure resistance between "WHT/BLU" wire
terminal of accelerator pedal position (APP) sensor
assembly connector and vehicle body ground.
Is resistance infinity?
8 Wire harness check
1) Measure resistance between "E23-55" and each "E23-
54", "E23-51" terminals of ECM connector with ignition
switch turned OFF.
Is each resistance infinity?
9 Wire harness check
1) Measure resistance between "WHT/BLU" wire terminal
of accelerator pedal position (APP) sensor assembly
connector and "E23-55" terminal of ECM connector with
ignition switch turned OFF.
Is resistance below 5
10 Accelerator pedal position (APP) sensor assembly
check
1) Check accelerator pedal position sensor (main) referring
to "Accelerator Pedal Position (APP) Sensor Assembly
Removal and Installation: in Section 1C".
Is output voltage within specified value?
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Action
Ω
?
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Yes
Substitute a known-
good ECM and recheck.
Go to Step 8.
Go to Step 9.
Go to Step 10.
Substitute a known-
good ECM and recheck.
No
"WHT" wire is shorted to
ground circuit.
"WHT/BLU" wire is
shorted to ground
circuit.
"WHT/BLU" wire is
shorted to "ORN" wire
and/or "BLU/YEL" wire
circuit.
"WHT/BLU" wire is open
or high resistance
circuit.
Replace accelerator
pedal position (APP)
sensor assembly.