1A-207 Engine General Information and Diagnosis:
5
Wire harness check
1) Measure voltage between “C37-53” terminal of ECM
connector and engine ground with ignition switch turned
ON.
Is voltage 0 V?
Substitute a known-
good ECM and recheck.
“WHT” wire is shorted to
other circuit.
6
Wire harness check
1) Measure voltage between “BLK” wire terminal of electric
throttle body assembly connector and engine ground,
between “RED” wire terminal of electric throttle body
assembly connector and engine ground with ignition
switch turned ON.
Is each voltage 4 – 6 V?
Go to Step 9.
Go to Step 7.
7
Wire harness check
1) Turn OFF ignition switch.
2) Disconnect connectors from ECM.
3) Check for proper connection of ECM connector at “C37-
54” and “C37-40” terminals.
4) If OK, measure voltage between “C37-54” terminal of
ECM connector and engine ground, between “C37-40”
terminal of ECM connector and engine ground.
Is each voltage 0 V?
Go to Step 8.
“BLK” wire or “RED”
wire is shorted to other
circuit.
8
Wire harness check
1) Measure resistance between “BLK” wire terminal of
electric throttle body assembly connector and engine
ground, between “RED” wire terminal of electric throttle
body assembly connector and engine ground with
ignition switch turned OFF.
Is each resistance infinity?
Substitute a known-
good ECM and recheck.
“BLK” wire or “RED”
wire is shorted to other
circuit.
9
Electric throttle body assembly check
1) Check throttle position sensor referring to “Throttle
Position Sensor Performance Check” under “Electric
Throttle Body Assembly On-Vehicle Inspection: in
Section 1C”.
Is each output voltage within specified value?
Substitute a known-
good ECM and recheck.
Replace electric throttle
body assembly.
Step
Action
Yes
No
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