DTC P1740: Problem In 4TH Clutch Transmission Fluid Pressure Switch Circuit

WARNING: This page is about a different car, the 2004 Honda Odyssey, 2003 Honda Odyssey, and 2002 Honda Odyssey. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Record all freeze data and review General Troubleshooting Information (see General Troubleshooting Information ) before you troubleshoot.

Turn the ignition switch ON (II).
Measure the voltage between PCM connector terminals B19 and B20 or B22.
Is there battery voltage?

YES - Go to step 7.

NO - Go to step 3.

Fig 1: Measuring Voltage Between PCM Connector Terminals B19 & B20 Or B22
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Turn the ignition switch OFF.
Disconnect PCM connector B (25P).
Disconnect the 4th clutch transmission fluid pressure switch connector.
Check for continuity between PCM connector terminal B19 and body ground.
Is there continuity?

YES - Repair short to ground in the wire between PCM connector terminal B19 and the 4th clutch transmission fluid pressure switch.

NO - Disconnect the 4th clutch transmission fluid pressure switch connector, and go to step 15.

Fig 2: Checking For Continuity Between PCM Connector Terminal B19 & Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Raise the front of the vehicle, and make sure it is securely supported.
Set the park brake, and block the rear wheels securely.
Start the engine, then shift to the D position and let the wheels spin in 4th gear for more than 5 seconds.
Measure the voltage between PCM connector terminals B19 and B20 or B22.
Is there about 0 V?

YES - Check for loose terminal fit in the PCM connectors. If necessary, substitute a known good PCM and recheck.

NO - Go to step 11.

Fig 3: Measuring Voltage Between PCM Connector Terminals B19 & B20 Or B22
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Turn the ignition switch OFF.
Disconnect the 4th clutch transmission fluid pressure switch connector.
Turn the ignition switch ON (II).
Measure the voltage between the 4th clutch transmission fluid pressure switch connector terminal and body ground.
Is there battery voltage?

YES - Go to step 15.

NO - Repair open in the wire between the 4th clutch transmission fluid pressure switch and the PCM.

Fig 4: Measuring Voltage Between 4th Clutch Transmission Fluid Pressure Switch Connector Terminal & Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Measure the resistance between the 4th clutch transmission fluid pressure switch connector terminal and body ground.
Is the resistance 10 MΩ or more?

YES - Check for loose terminal fit in the PCM connectors. If necessary, substitute a known-good PCM and recheck.

NO - Replace the 4th clutch transmission fluid pressure switch (see 3rd Clutch Transmission Fluid Pressure Switch Replacement ).

Fig 5: Measuring Resistance Between 4th Clutch Transmission Fluid Pressure Switch Connector Terminal & Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.