P0230 Code - Fuel Pump Primary Circuit Malfunction

What Does P0230 Mean?

The catalytic converter has an oxygen sensor in front and behind it. When the vehicle is warm and running in closed loop mode, the upstream oxygen sensor waveform reading should fluctuate. When you see P0230 engine fault code on your engine code reader this description will help you.

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What are the common causes of P0230 ?

• Faulty IMRC actuator relay (if equipped)
• A large air leak at or near the number one oxygen sensor would also cause a lean mixture.
• Faulty IMRC actuator/sensor

How do you troubleshoot P0230 ?

A circuit malfunction indicates there is a problem in the circuit, not necessarily in the sensor or actuator, in this case the fuel pump. Do not jump to replace anything unless it has been tested and found faulty. For example, replacing the fuel pump will not solve this problem unless the fuel pump is shorted internally. You’ll need a DMM (digital multimeter) and an EWD (electrical wiring diagram) to diagnose and repair this problem.

Voltage Check – First, check that the battery has at least 12.6 V with the engine off and at least 13.5 V with the engine running. Correct any problems here before proceeding.

• Fuse Check – Check the fuel pump fuse. If the fuse is blown, this may indicate a short circuit somewhere in the system. Proceed with caution – simply replacing the fuse may result in another blown fuse until you repair the short circuit.
• Short Circuit Check – With the fuel pump relay removed, you should measure at least 4 Ω through the pump to ground. If you measure <4 Ω, you’ll have to find and repair the short circuit. Repeat the test with the fuel pump disconnected.
• If the short circuit persists, the short is somewhere between the relay and ground. Look for chafed wiring or poor aftermarket installations that may have caused the short-circuit.

If you get an open circuit, >10 kΩ, the previous short circuit is in the pump. With the pump disconnected, measure resistance across the terminals. If you measure less than 4 Ω, replace the pump.

Fuel Pump Relay Check – You can do this by swapping it with a known-good relay, such as for the wipers or headlights. Otherwise, you can bench-test it by powering the primary circuit and checking for resistance across the secondary circuit.

If the relay swap works – you marked their original locations, right? – you can condemn the fuel pump relay.

If the relay swap doesn’t work, put the relays back in their original positions.



A General Fuel Pump Relay and Monitor Circuit

Relay Inputs and Outputs Check – Two terminals of the fuel pump relay should have power and two of them go to ground.

• Test for resistance to ground on the secondary (fuel pump) circuit, which should measure at least 4 Ω to 6 Ω. Go back to the short circuit section above.
• The primary circuit is grounded by the ECM, so you should check for ground when you turn the key to the “On” position or try to crank the engine. If you see no ground, check for an open circuit somewhere between the relay and the ECM.

Fuel Pump Monitor Circuit – With the ECM disconnected, check for continuity from the fuel pump relay secondary circuit to the ECM. An open circuit or excessive resistance here will fool the ECM into thinking the fuel pump isn’t getting enough voltage.

• If you measure more than 0 Ω, check for broken wires or corrosion. Repair as needed.

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