1A-249 Engine General Information and Diagnosis:
Troubleshooting
NOTE
• Before performed troubleshooting, be sure to read the “Precautions of ECM Circuit Inspection: ”.
• When measuring circuit voltage, resistance and/or pulse signal at ECM connector, connect the
special tool to ECM and/or the ECM connectors referring to “Inspection of ECM and Its Circuits: ”.
Step
Action
Yes
No
1
DTC check
1) Connect scan tool to DLC with ignition switch turned
OFF.
2) Turn ON ignition switch and check DTC.
Is there DTC P1674 and/or P1678?
Go to applicable DTC
diag. flow.
Go to Step 2.
2
Electric load signal circuit check
1) Start engine and select “DATA LIST” mode on scan tool.
2) Check electric load signal under following conditions
respectively.
A/C switch signal
Engine running, A/C switch OFF: OFF
Engine running, A/C switch ON and blower speed
selector turned 1st position or more: ON
Blower fan signal
Engine running, blower speed selector OFF: OFF
Engine running, blower speed selector 5th position
or more: ON
PSP signal
Engine running, steering wheel to neutral position:
OFF
Engine running, turning steering wheel to the right
or left as far as it stops: ON
Electric load signal
Engine running, rear defogger switch or headlight
switch OFF: OFF
Engine running, rear defogger switch or headlight
switch ON: ON
Is check result satisfactory?
Electric load signal
circuit is in good
condition
Check defective signal
circuit.
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