Ignition failure sensor is used to check whether the spark ignition is occurred correctly or not and also used to tachometer drive. The sensor monitors the voltage difference between a resistance which is on the battery circuit for ignition coil. When the ignition coil works properly, the electric current through the resistance is detected as voltage drop. This is confirmed for every ignition event with the crankshaft sensor and the camshaft sensor. If PCM detects a malfunction, no ignition is possible, so the engine would not start. If there is no ignition signal for a predetermined cycle for one or two ignition coils, an ignition coil circuit failure exists.
If there is no current at all of the ignition coils, the PCM determines that a fault exists and a DTC is stored.
TERMINAL& CONNECTOR INSPECTION
Many malfunctions in the electrical system are caused by poor harness and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
Has a problem been found?
YES: Repair as necessary and go to "Verification of Vehicle Repair" procedure.
Check that RPM meter on instrument panel is operating correctly and the signal waveform of IG failure sensor at terminal 4.
Is the IG failure sensor normal?
YES: Substitute with a known - good PCM and check for proper operation. If the problem is corrected, replace PCM and go to "Verification of Vehicle Repair" procedure.
NO: Substitute with a known - good IG failure sensor and check for proper operation. If the problem is corrected, replace IG failure sensor and go to "Verification of Vehicle Repair" procedure.
VERIFICATION OF VEHICLE REPAIR
After a repair, it is essential to verify that the fault has been corrected.
Monitor and record the Freeze Frame Data for the Diagnostic Trouble Code(DTC) which has been diagnosed.
Using a Scantool, Clear the DTCs.
Operate the vehicle within conditions noted in the freeze frame data or enable conditions.
Monitor that all readiness test have been verified as " Complete "
Are any DTCs present?
YES: Go to the applicable troubleshooting procedure.
NO: System is performing to specification at this time.
2. 134, 154 are o2 heater codes for both upstream o2 senswors. One of them is bad causing the fuse to most likley blow for the heater. You need someone to figure which one is bad.
3, 441 you need a shop with a scan tool, smoke machine and voltmeter to determine the failure