Ignition noise filter location - 1997 Toyota Camry

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It may run fine but it's in fail safe mode
DTC P0351-P0354
DTCs P0351 through P0354 Ignition Coil Primary/Secondary Feedback Circuit diagnostic monitors the primary circuitry of individual ignition coils for the successful completion of an ignition event. The ignition trigger signal and ignition fail-safe input signal provide crucial information in the control of ignition system timing and the activation of the fail-safe function. Based on the initial timing angle, calculated from the crankshaft and the camshaft position signals, the powertrain control module (PCM) calculates the ignition trigger signal. The ignition trigger signal is then sent to the ignition control circuitry located in each ignition coil. The ignition control circuitry initiates the ignition dwell period by commanding the power transistor ON. When the PCM determines the proper time to provide spark, the PCM turns OFF the ignition trigger signal. In response to the PCM signal, the ignition coil control circuitry turns OFF the power transistor, producing a high voltage discharge from the secondary coil windings. After the spark has occurred, the control circuitry sends an ignition fail-safe input signal back to the PCM, confirming that an ignition event has taken place. If the ignition fail-safe input signal is not received by the PCM, a cylinder specific DTC will set.
Anytime the fail-safe input signal is lost, engine operation will enter the fail-safe function. If engine load exceeds certain parameters during the fail-safe function, Fuel Cut-off mode is activated and fuel injector operation is ceased. The suspension of fuel injection in the Fuel Cut-off mode protects the catalytic converter from damage. Damage can occur when excess unburned fuel reaches the converter and causes the catalyst to overheat.

Diagnostic Aids
• Check for the following conditions:
- An interruption of the ground circuit or voltage supply to the ignition coil will prevent a proper ignition event from taking place. A DTC P0351 through P0354 will set if there is a fault in any of the ignition coil circuits.
- If DTCs P0352, P0353, and P0354 are present, the fault is located in the shared electrical circuits or shared components of the ignition coils.
- Inspect the ignition coil grounds at G 105 for a clean and tight connection.
- The scan tool data parameters for Misfire Current Cylinder # are frozen at the time the MIL illuminates when the DTC sets.
- If no engine misfire is felt when the DTC sets, inspect for a fault in the Ignition Fail-Safe Input circuit.
- Inspect the noise filter for an internal short or low resistance. The ignition coil may not receive adequate voltage during high load conditions if the noise filter is faulty. A good noise filter will indicate infinite resistance (OL) with a DMM after the capacitor inside the filter is charged up.
- Unless the ignition key is cycled or the DTCs are cleared, the PCM waits to receive ignition fail-safe signals before providing fuel injector operation.
• An intermittent malfunction may be caused by a fault in the ignition coil electrical circuit. Inspect the wiring harness and the components for an intermittent condition. Refer to Intermittent Conditions .
• Repair any electrical circuit faults that were found. Refer to Wiring Repairs .
• The information included in the Freeze Frame data can be useful in determining the vehicle operating conditions when the DTC first set.

Reasons for popping noise:
Popping noise could occur due to the malfunction in the ignition system, leaky valves, weak cylinder compression, carbon accumulation in the combustion chamber or lean fuel.
1. Ignition system malfunction (Misfire).
Check:
- The ignition timing.
- Spark plug gaps.
- Use colder type spark plugs.
- Ignition module and ignition coil.
- Distributor cap and rotor.
- Spark plug high tension cords.
2. Cylinder compression:
- Check valves clearance.
- Perform cylinder compression test.
3. Fuel system (For lean state).
- Check fuel filter for clogged.
- Check fuel injectors.
- Check fuel pump pressure.
- Check fuel regulator.

No gas, weak battery (battery may be new but is it charged?), crankshaft or camshaft sensor is bad, fuel pump bad, fuel pump relay or fuse is bad, haven't pushed clutch down far enough(rug caught underneath), fuel filter clogged, ignition coils bad. You need to give a hint as to what you have tried. Does it crank but not start/ Does it simply click(starter) and not crank/

Put a noise filter on the power input line to the sub.

pump noise is what you hear if noise is very loud or rough have dealer ck . other wise dont worry the noise is normal.

I would disconnect the noise filter located by the ignition coil/ignitor, have seen them short out and cause the AM2 fuse to blow. Also Disconnect coil, dist and see if short goes away

First check the fuel pump relay, if good check for clogged in line filter, if good it's probably the fuel pump located in the fuel tank. You should hear a light humming noise coming from the rear of the car as you turn on the ignition just before cranking the engine.

This is caused by a blend door actuator on the rear a/c unit. There are 2 located on the case. Take it to a dealer and they will know what you are talking about.

Some alternators have a built in filter capacitor. That can cause noise. Also check ignition wires for arcing...Grounds are near battery to fender, battery to block block to firewall and computer to fender. You cfan add grounds where needed (or wanted) with no problem.