ON-BOARD DIAGNOSTIC
F–125
F
Diagnostic procedure
STEP INSPECTION ACTION
1 VERIFY FREEZE FRAME DATA HAS BEEN
RECORDED
• Has FREEZE FRAME DATA been recorded?
Yes Go to next step.
No Record FREEZE FRAME DATA on repair order, then go to
next step.
2 VERIFY RELATED SERVICE INFORMATION
AVAILABILITY
• Check for related Service Information
availability.
• Is any related Service Information available?
Yes Perform repair or diagnosis according to available Service
Information.
• If vehicle is not repaired, go to next step.
No Go to next step.
3 VERIFY RELATED PENDING CODE OR
STORED DTCS
• Turn ignition key to OFF then ON (Engine
OFF).
• Verify related pending code or stored DTCs.
• Is other DTCs present?
Yes Go to appropriate DTC troubleshooting.
(See F–67 DTC TABLE.)
No Go to next step.
4 VERIFY CURRENT INPUT SIGNAL STATUS
(IGNITION KEY TO ON /IDLE)
• Access BOO, ECT, IAT, MAF, RPM, TP and
VSS PIDs using WDS or equivalent.
(See F–45 PCM INSPECTION.)
• Is there any signal that is far out of
specification when ignition switch is ON and
engine runs at idle?
Yes Inspect suspected circuit and/or part according to
inspection results. Then go to Step 12.
(See F–45 PCM INSPECTION.)
No Go to next step.
5 VERIFY CURRENT INPUT SIGNAL STATUS
UNDER TROUBLE CONDITION
• Inspect same PIDs as in Step 4 while
simulating FREEZE FRAME DATA condition.
• Is there any signal which causes drastic
changes?
Yes Inspect suspected circuit and/or part according to
inspection results. Then go to Step 12.
(See F–45 PCM INSPECTION.)
No Go to next step.
6 INSPECT SPARK PLUG CONDITION
• Turn ignition key to OFF.
• Remove spark plug from suspected cylinder.
• Inspect spark plug condition:
— Cracks
— Excess wear
— Gap
— Wet
• Is any problem found on spark plug?
Yes • If spark plug is wet, fuel flooding is suspected. Go to
step 12.
• If spark plug has a cracks, excessive wear or improper
gap, replace faulty spark plug. Then go to Step 12.
No Go to next step.
7 VERIFY HIGH-TENSION LEAD CONDITION
• Remove high-tension lead.
• Inspect high-tension lead condition and
resistance.
— Cracks
— Spark shorts to cylinder head through high-
tension lead insulator
• Is high-tension lead okay?
Yes Go to next step.
No Replace high-tension lead, then go to Step 12.
8 INSPECT FOR AIR SUCTION AT INTAKE-AIR
SYSTEM
• Inspect for air leakage at following:
— Around connection of dynamic chamber and
intake manifold
— Around connection of intake manifold and
cylinder head
• Is air leakage found?
Yes Repair or replace suspected part, then go to Step 12.
No Go to next step.
9 INSPECT FUEL INJECTOR HARNESS
• Remove intake air system parts.
• Disconnect fuel injector connector on
suspected cylinder.
• Connect NOID LIGHT to fuel injector connector
terminals.
• Inspect dim of light during cranking.
• Does noid light illuminate?
Yes Go to next step.
No Inspect for fuel injector harnesses.
Repair or replace it if necessary, then go to Step 12.
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