Engine General Information and Diagnosis: 1A-190
DTC Troubleshooting
NOTE
Before this trouble shooting is performed, read the precautions for DTC troubleshooting referring to
“Precautions For DTC Troubleshooting: ”.
Step
Action
Yes
No
1
Was “Engine and Emission Control System Check”
performed?
Go to Step 2.
Go to “Engine and
Emission Control
System Check: ”
2
Throttle actuator control relay circuit check
1) Remove ECM from its bracket with ECM connectors
connected.
2) Check for proper connection of ECM connector at “E23-
50” and “E23-17” terminals.
3) Turn ON ignition switch.
4) Measure voltage between “E23-17” terminal of ECM
connector and engine ground.
Is voltage 10 – 14 V?
Intermittent trouble.
Check for intermittent
referring to “Intermittent
and Poor Connection
Inspection: in Section
00”.
Go to Step 3.
3
Is “THR MOT” fuse in good condition?
Go to Step 4
Replace fuse and check
for short in circuits
connected to this fuse.
4
Throttle actuator control relay circuit check
1) Remove throttle actuator control relay from relay box
with ignition switch turned OFF.
2) Check for proper connection to throttle actuator control
relay at “BLU/BLK”, “BLU/RED”, “BLU/ORN” and “GRN”
wire terminals.
3) Measure voltage between engine ground and each
“BLU/BLK”, “BLU/RED” wire terminal with ignition switch
turned ON.
Is each voltage 10 – 14 V?
Go to Step 5
“BLU/BLK” wire and/or
“BLU/RED” wire is open
or high resistance.
5
Throttle actuator control relay circuit check
1) Disconnect connectors from ECM with ignition switch
turned OFF.
2) Measure resistance at following connector terminals.
• Between “BLU/ORN” wire terminal of throttle actuator
control relay connector and “E23-50” terminal of ECM
connector
• Between “GRN” wire terminal of throttle actuator
control relay connector and “E23-17” terminal of ECM
connector
Is each resistance below 3
Ω
?
Go to Step 6.
“BLU/ORN” wire and/or
“GRN” wire is open or
high resistance.
6
Throttle actuator control relay check
1) Check throttle actuator control relay referring to “Control
Relay Inspection: in Section 1C”.
Is it in good condition?
Substitute a known-
good ECM and recheck.
Replace throttle
actuator control relay.
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