I have a 91 toyota pick up with a 3.0 im getting dtc 52 after driving short distances. I have replaced the engine (short block and reman heads) for an unrelated problem and along with that i replaced the knock sensor and pigtail harness. After I had replaced the sensor there was a fault set every time the the vehicle was revved up past idle, I found that the new sensor was bad and replaced it again and now I have my current problem. I have overlaid the harness with a shielded wire and i still get the same problem. the knock sensor is not an oem part. any advice?

are you buying reman ones? id try a new denso one or dealer one

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COULD BE THERMOSTAT IF TOP RADIATOR HOSE IS NOT HOT AND BOTTOM RADIATOR HOSE GOING TO WATER PUMP IS HOT THE THERMOSTAT STICKING PARTIALLY CLOSE.IF TOP HOSE IS HOT THE RADIATOR,ENGINE BLOCK HEATER CORE NEED FLUSHING OUT.IF WATER PUMP WEEP HOLE LEAKING REPLACE WATER PUMP, FAULTY WATER PUMP WILL CAUSE ENGINE TO OVER HEAT.REPLACE RADIATOR CAP MAKE SURE YOU HAVE 50 / 50 MIX SOLUTION ANTIFREEZE AND WATER IN COOLANT SYSTEM. IF ALL LOOKS GOOD CHECK ENGINE OIL ON DIP STICK, IF OIL IN DIP STICK LOOK LIKE MILKSHAKE YOU HAVE BLOWED HEAD GASKET THAT WILL CAUSE ENGINE OVERHEATING WHILE DRIVING CAR IN SHORT DISTANCE AND ENGINE OVERHEATING.

P0741 is internal transmission failure the clutches fail along with the torque converter and the transmission will need to be replaced.

Check and follow this procedure from Honda Service News November 2003 TITLE:
A/T DTC P0740, P0741 Repair Tips: Another Look APPLIES TO: All Models

SERVICE TIP: If you're doing a repair for DTC P0740 or P0741 (lock-up control system) on any Honda models with A/T, except Passport, refer to this table first:



If there is no S/B posted on ISIS for the vehicle you're working on, go to the DTC P0740 or P0741 troubleshooting procedure in the Automatic Transmission section of the appropriate S/M or under DTC Troubleshooting in ISIS. If the procedure recommends replacing the A/T, make sure you have a reman A/T on hand. Remove the original A/T, and look at the condition of the torque converter O-ring. Then follow these tips to ensure a lasting repair.

Missing or cut O-ring . If the O-ring is missing or cut, the ATF can leak internally, causing DTC P0740 or P0741 to set. Replace the O-ring, and reuse the original A/T. Make sure the problem has been fixed by connecting the HDS and testdriving the vehicle using the previous DTC P0740 or P0741 freeze data parameters (match the TPS and VSS values for at least 25 seconds ). If the DTC comes back, install the reman A/T. If the DTC doesn't come back, return the reman A/T to the reman center.

Flattened or deformed O-ring . If the O-ring is flattened or deformed, replace the A/T. The O-ring can get damaged if the ATF pump seizes up and overheats. Make sure the problem has been fixed by connecting the HDS and testdriving the vehicle using the previous DTC P0740 or P0741 freeze data parameters (match the TPS and VSS values for at least 25 seconds ).

O-ring is OK . If the O-ring is round and in good condition, the most likely cause for DTC P0740 or P0741 to set is the A/T, the torque converter, or both. Install the reman A/T. Make sure the problem has been fixed by connecting the HDS and test-driving the vehicle using the previous DTC P0740 or P0741 freeze data parameters (match the TPS and VSS values for 25 seconds ). Before you install the reman A/T, make sure the O-ring on the torque converter is properly installed.


Hope helps.

There are several likely causes, none very rosy: 1) head is warped (was it surfaced and/or straightened in conjunction with the new head gasket?). 2) gasket damaged during installation. 3) head is cracked. 4) block is warped and/or cracked.
If you are committed to the car I'd recommend finding a re-manufactured head from a quality supplier and have it professionally installed. That covers 1 -3. #4 is very difficult to access without removing the engine from the car and taking it apart and having it magnafluxed. The only sure thing is a complete engine with a warranty. Cost of the reman engine is probably in excess of the value of the van.
Good luck

If it is a constant smoke and or alot, your head gasket is blown. stop driving it if you want to save this engine. also engines with really high miles don't like head jobs, remanned heads can blow out the rings on the pistons and that leads to an engine rebuild. If your car has really high miles , you would be better off replacing the engine

my name is Jerry Tiet. Base on my experience on 1998 Toyota Sienna with the DTC P0303 show there is a misfire in cylinder #3. a possible cause is the ignition coil of the #3 cylinder. Compare the resistance value of the ignition coil of cylinder #3 with the other coil or simply switch ignition coil #3 with one of the other ignition coil and clear the DTC with the scan tool. Then run engine for couple days. If the check engine light on again. Let me know what is the DTC code.

It could be a bad thermostat, the Clutch Cooling Fan is not engaging or you may have air in the cooling system still and it need to be bled out.

roughly $2000, give or take a few hundred

DTC 52 on a 93 Corolla is a Knock Sensor code. I replace the knock sensor; it is located on the side of the engine block, on the side of the engine that faces the firewall. It is in the center; under the intake manifold.

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